Service Manual
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Service Manual PneumoCheck™ Spirometer Model # 61000, Printer Charger #’s 76100 & 76106
Welch Allyn Medical Division 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Copyright 1997 Part 610132
Part N o.
R ev.
D escription of C hange
EC N #
D ate
Approved
610132
D
Revi sed and Redrawn to i nclude Troubleshooti ng Informati on
5-36590
Oct 97
R. Settembre
610132
E
Added Pri nter/C harger Bench Test i n Secti on 2
5-42325
Nov. 00
Fran Lerro
DRAWINGS AND/OR ILLUSTRATIONS AND/OR PART NUMBERS CONTAINED IN THIS DOCUMENT ARE FOR REFERENCE PURPOSES ONLY! FOR CURRENT REVISIONS CALL WELCH ALLYN.
Service Manual 610132 Rev. E
Pneumocheck Handle and Printer/Charger 1
2 Pneumocheck Handle and Printer/Charger
Service Manual 610132 Rev. E
Contents General Information ........................................................................................................... 5 1.1 Handheld Spirometer ................................................................................................................6 1.2 Printer ......................................................................................................................................... 8
Service ............................................................................................................................... 11 2.1 Bench Test Of Pneumocheck ................................................................................................. 12 2.2 Bench Test of Printer Charger ................................................................................................ 17 2.3 Required Tools and Equipment ............................................................................................. 21 2.4 Test and Adjustment Procedures ........................................................................................... 22
Theory of Operation .......................................................................................................... 23 3.1 Spirometer Circuit Description .............................................................................................. 24 3.2 Spirometer - Printer Circuit Description ............................................................................... 30 3.3 Messages ................................................................................................................................. 33
Troubleshooting ................................................................................................................ 37 4.1 PneumoCheck Handle Technical Troubleshooting ............................................................. 40 4.2 Customer Service Questions and Answers ......................................................................... 43
Disassembly and Repair ................................................................................................... 49 5.1 Pneumocheck Handle Disassembly Procedures ................................................................ 50 5.2 Pneumocheck Printer/Charger Disassembly Procedures ................................................. 56
Pneumocheck Handle and Printer/Charger Spare Parts ............................................... 65 List of Drawings and A Specs .......................................................................................... 67
Service Manual 610132 Rev. E
Pneumocheck Handle and Printer/Charger 3
Help Information: •
All service and repairs must be performed by authorized Welch Allyn personnel or agents, using Welch Allyn replacement parts. Failure to do so will invalidate the product warranty.
•
If you have any questions about servicing the 61000 Pneumocheck or the 76100 or 76105 Printer Chargers, please call or write Welch Allyn:
Attn: Product Service Department Welch Allyn, Inc. 4341 State Street Road Skaneateles Falls, NY 13153-0220 U.S.A. Telephone: 800-535-6663 Fax: 315-685-4653
•
Troubleshooting assistance is contained in Section 4 of this manual.
•
Please read and understand the PneumoCheck and Printer/Charger Operating Instructions PN 610140-3.
4 Pneumocheck Handle and Printer/Charger
Service Manual 610132 Rev. E
Section 1 - General Information
1.1
Basic Description - Handheld Spirometer
1.2
Basic Description - Printer
Service Manual 610132 Rev. E
General Information
Pneumocheck Handle Printer/Charger 5
Section 1 - General Information 1.1
Handheld Spirometer
Refer to Owners Guide P/N 610140-3
The handheld spirometer is a small, battery operated device incorporating a laminar flow sensing pneumatic liquid crystal display, and electronic circuitry in an injection molded case. The front panel of the handheld spirometer includes the eight character, alphanumeric display, two push-button keys labeled TEST and DATA, an ON/OFF slide switch and a battery charge indicator light. The flow sensor is housed in the top portion of the device and is removable for cleaning and sterilization. The mouth piece is at one end of the flow sensor and fits disposable cups or disposable cardboard tubes. There are two electrical contacts on each side to the spirometers batteries. On one side of the spirometer is a DC jack for battery charging in case the operator chooses not to purchase the optional printer base. The main function of the handheld spirometer is to gather data from two kinds of spirometry maneuvers by patients: the FVC maneuver and the MVV maneuver. The TEST key is used to select and perform the desired test. It is normally pressed when the spirometer is displaying the word SELECT. It can also be pressed during a maneuver or during the results display to prematurely quit a test and begin another. The DATA key is used to continue whenever the device pauses to display some information. When the word SELECT is being displayed, the DATA key can be used to show the results of the test that is currently stored in memory. The general flow of usage of the device starts with the selection of a test. The operator then waits for an audible beep, indicating that it is ready to acquire data from the maneuver. The patient puts the mouth piece to his mouth and performs the maneuver. Upon completion indicated by another audible beep, there is a brief delay while the results are calculated then the result messages are displayed. This completes the loop, and the machine goes back to SELECT and waits for another keypress.
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Service Manual 610132 Rev. E
Section 1 - General Information
When not in use, the handheld spirometer sits-in the cradle of the printer base (or it is connected to an outlet via a DC power adapter,) and the battery is charged. The battery indicator light remains on whenever a source of charge current is present. The spirometer becomes operational when it is lifted from the printer base or disconnected from the DC adapter. The spirometer is functional only while disconnected from the charger or printer base and the ON/OFF switch is ON. The word SELECT appears on the display and the device waits for a keypress from the operator. When the word SELECT is on the display, you can do one to the following: 1.
Press the test key which will start the sequence for doing an FVC test, and MVV test, or a calibration of the spirometer.
2.
Press the DATA key which will display the test values of the best test of a test is currently stored in the spirometer’s memory.
3.
Put the spirometer back into the printer cradle which will start the sequence for transmitting any test data in the spirometer’s memory to the printer’s memory, and then resume charging the battery.
4.
Connect the spirometer to the DC power adapter, which will resume charging the battery.
5.
Turn the unit off using the ON/OFF slide switch.
A more detailed description of the operation of the spirometer is contained in the Operator’s Manual.
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Pneumocheck Handle Printer/Charger 7
Section 1 - General Information
1.2 Printer
The printer base consists of a receptacle to hold the spirometer, a battery charging circuit, a high speed thermal line printer, and associated microprocessor a power circuitry, all housed in an injection molded case.
The front panel of the printer includes 2 indicator lights, and 3 push button keys marked STOP, FEED, and PRINT. Also on the front panel are 5 numeric rotary switches: 2 digits for AGE, and 3 digits for HEIGHT. The are also 2 slide switches for selecting SEX and RACE.
There is a set of 4 option switches located on the underside of the unit.
The main function of the printer base is to print reports of spirometry tests performed by the handheld spirometer, and to charge the spirometer’s battery.
The general flow of usage is as follows: When the spirometer is placed in the cradle of the base, it immediately begins sending data to the printer base during which time the message SENDING appears on the panel of the printer base. Once the data transfer is complete, the printer base gives a compound beep and continues to charge. The READY light on the printer base turns on solidly, indicating that there is a test stored in its memory. The operator then sets the patient demographic switches for the patient, then presses the PRINT key to print the report.
There are two indicator lights on the front panel of the printer base. One is labeled POWER and is on whenever the unit is plugged into a powered outlet. The other light is labeled READY, in the memory of the printer base. When the device is receiving data from the spirometer, this light flashes. Once the transfer is complete and test is in memory, the light remains on. 8 Pneumocheck Handle and Printer/Charger
Service Manual 610132 Rev. E
Section 1 - General Information
The READY light is also used to indicate an error condition. Errors are numbered from one to three. When an error occurs, an alarm sounds and the READY light flashes in groups of 1, 2, or 3 flashes (at a rate of times per second), corresponding to the error that was detected. A one second pause occurs between these flashes. This continues until the error condition has been cleared.
The PRINT key is used to print a report. If there is no report to be printed and the PRINT key is pressed, a short chirp will sound and no report is printed.
The FEED key is used to feed paper out of the printer. The paper is fed as long as the key is held down. The key is not operable while a report is being printed or while the data is being transferred from the spirometer.
The STOP key aborts the current task (report printing or data transfer) and returns to the wait state of the base. It is also used to clear the machine of any error condition that it might be in. It does not clear the printer base’s memory.
The demographic switches are used to indicate the patient’s age, height, sex, and race. The AGE switch consists of two digits, each of which can range from 0 to 9. The range of valid values depends on the normal being used.
The HEIGHT switches operate in the same manner as the AGE switch, except that it has three digits. Either inches or centimeters can be used for the height. As was the case for AGE the range of valid values depend on the normal being used.
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Pneumocheck Handle Printer/Charger 9
Section 1 - General Information If the value for either age or height fails outside of valid range, then the normal values are not calculated or printed on the report.
The SEX switch is a slide switch. The up position indicates the patient is a female, while the down position indicates that the patient is male. The RACE switch is also a slide switch. The up position indicates race group 1 and the down position indicates race group 2. Race group 1 is used if the patient is Black, Oriental, East Indian, or Pakistani. Race group 2 is used for all other races.
There are four option switches located on the underside of the printer base. The switches are dip switches that can be in either the ON or OFF position. These switches can be changed while the printer base is on. The options specify certain aspects of the report printing. They are: 1. 2.
OFF OFF
Knudson, 1983
1. 2.
ON OFF
Knudson, 1976
1. 2.
OFF ON
Morris, Crapo et al
1. 2.
ON ON
European
3. 3.
OFF: Short report form ON: Long report form
4. 4.
OFF: Flow/Volume plot ON: Volume/Time plot
These options are discussed in further detail in the Operator’s Manual.
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Service Manual 610132 Rev. E
Section 2 - Service
Service 2.1
Bench Test of Pneumocheck
2,2
Bench Test of Printer/Charger
2.3
Required Tools and Equipment
2.4
Test and Adjustment Procedures
Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 11
Section 2 - Service 2.1 BENCH TEST OF PNEUMOCHECK 1
Remove pneumotach if necessary.
2
Obtain a good set of batteries and insert in pneumocheck.
3
Replace pneumotach. Turn pneumocheck on. If unit powers up continue testing (steps 3 & beyond). If unit doesn’t power up, take apart. Refer to troubleshooting guide.
4
Put into data mode (hold down white button, turn unit on and release white button).
5
Observe LCD; all segments should be on.
6
Depress and release ‘test’ button. Unit should step through a self diagnostic. Testing > ROM OK > RAM OK > EEPRM OK> ASLEEP
SECTION A Caution: Adequate ESD protection must be worn at all times when working on the Pneumocheck, handle or printer/charger.
In ‘ASLEEP’ mode, the unit will stop and await further instruction. If unit stops before sleep mode, there is a failure. Refer to troubleshooting guide. 7
Depress & release test button: ON reading should be displayed. It should read between 30 and 80. Continue testing whether on reading is in range or not. Calibration of this circuit will be covered in SEC B, STEP 6.
8
Depress & release test button: Unit should give BAT reading. This should be 815 +/- 1% (807-823). Even if number is outside of range, continue on to steps 9-12. Refer to troubleshooting guide to diagnose after completing step 12.
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Service Manual 610132 Rev. E
Section 2 - Service 9
Depress & release test button: Ambient temperature should be displayed. 20 degrees C = 68 degrees F 22 degrees C = 72 degrees F 24 degrees C = 75 degrees F 25 degrees C = 77 degrees F 27 degrees C = 81 degrees F 30 degrees C = 86 degrees F If unit displays a reading outside ambient temperature range, complete steps 10 thru 12. Then, refer to troubleshooting guide. If unit displays a reading of 390-400 degrees F, check battery voltages. If battery voltage is low, replace battery and repeat steps 4 thru 12.
10
Depress & release test button: Unit should read FO = 55. This is a software coefficient.
11
Depress & release test button: Unit should display a flashing ‘BAT OK’ message.
12
Depress & release test button: Unit should display ‘DO DCV’ message.
13
Turn unit off. Depress test button and turn unit on, release test button. Unit should read: ‘Test Mode’ >VER.3.5 >clear > select. The latest software is VER 3.5: If unit reads VER 3.2, the software must be changed. The PROM is part no 610102-535. It goes into position U4 of the LCD digital PC board.
Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 13
Section 2 - Service Disassemble Unit: SECTION B
Wear ESD wrist strap when performing the following operations. 1
Observe backplate; notice what must be present:
If there is a raised surface where the ‘flat’ should be and/or if there is no recessed circle, replace backplate (610015-503). Remove battery holder before discarding old backplate. NOTE:Observe back of LCD board. If back of LCD board does not have a metal bar, you must replace this board. 2
Apply a moderate amount of force to the side of each battery contact. Contact should hold firm. If it does not, take battery contact off and clean any dried epoxy off of metal conducting surface on PC board. Obtain a new battery contact (610067-1) and solder to PC board, noting proper positioning. Before soldering, screw contact onto PC board with appropriate hardware. Lastly, tighten to specifications (approx. 12-16 in/oz.) or until moderately firm. Take note that black fiber washer is not destroyed. Perform this step whether epoxy was adequate or contact had to be soldered.
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Service Manual 610132 Rev. E
Section 2 - Service 3
If required, change Red LED to orange (230015-6).
4
If necessary, change software. You must remove digital board from front plate to do this. PROM is location U4 on digital board.
5
If necessary, reverse side contacts. To do this, remove the two metal contacts from the black plastic piece. Reverse the plastic piece so that metal contacts will be raised outside of plastic surface of main frame. Do this for each side.
6
Calibrate the transducer circuit: to get to ON reading, see steps 4-7 section A. If ON reading was in spec.(see step 7, section A), set to 50 or as close as you can get (within 5 cts.), using R33 (pot at bottom of PC board). Apply 58.8 DPA (60 mm of water with manometer) to transducer via long hose. Adjust R36 (pot just above R33) to 844 +/- 5 cts. Return to ODPA, reading should be 50 +/5 cts. Readjust if necessary.
If the transducer reading is outside of the 30-80 range, measure the transducer output ofpins 2 and 4 of the transducer. They are the two white wires coming from the transducer. You should see no more than approx. 300 micro volts (.3mv). If this is the case, readjust ON reading to spec. as per sec. B, step 6. If you see more than 300 mcvolts (.3mv), replace transducer. If you cannot build pressure in transducer, diaphragm is torn, replace transducer.
Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 15
Section 2 - Service Once transducer is replaced, calibrate according to Section B, step 6. Once transducer is calibrated, re-assemble unit.
7
With unit assembled and good batteries in, without the pneumotach (top piece), insert into working printer charger. With a DC ammeter, measure current between the top of each battery. You should see approx. 11 ma recharge current. If reading is outside of 10-12 ma, refer to troubleshooting guide.
8
If reading is good, assemble pneumotach onto handle. Obtain final test form. Step through, test in ‘DATA’ mode as per Section A, steps 4-12 . Observe ‘ON’ reading . As you do this and write down in appropriate place on form. Continue to move forward until you see DO DCV.
At this point throw switch on test printer to RXTX OK position. This puts a short circuit between the RX and TX communication lines. Insert handle. The following messages should appear: DCV SEEN > RXTX OK > CHARGE > screen blank. If they do, remove handle, the message DO DCV should re-appear. Return switch on test printer to RX fail position. These tests are taken from spec. A01943 Rev.F.
Get ready to calibrate w/3.0 liter syringe according to spec. A01945 Rev.D.
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Service Manual 610132 Rev. E
Section 2 - Service 1. ESD protection is required whenever working with the pneumocheck printer.
2.2 Bench Test of the Pneumocheck Printer/charger
2. Apply power to the unit. It should beep twice and the “power LED” will light. The “data” light should not be lit.
3. Note and record “dip” switch settings if customer owned. These switches will have to be returned to these positions when testing is complete.
4. Check printer well to make sure there is no foam pad. If there is one, it must be removed. Make sure printer is powered down. Remove pad by walking and rolling back pad from ends. Move slowly as to not tear the pad if possible. Continue until pad is removed. Clean remaining adhesive with an adhesive remover solution. Try to avoid scratching the printer well plastic piece.
5. Complete the following tests: A . With a DVM set on the 200VDC range, measure 14vdc across contacts as shown below that are marked with an (**). 14 vdc ** ##
## gnd **
B. Check voltage between ground contact in printer well and pin 8 of the J2 connector. The J2 connector is the longer of the two groups of pins in front of the printhead. Pin 1 is at the left end of the longer group, counting left to right. The voltage should be between 4.75 and 5.75 vdc.
C. Check voltage between ground contact in printer well and pin 1 of the J2 connector. The voltage should be 24vdc +/- .5 volts. Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 17
Section 2 - Service
D. Install a paper roll if one is not installed. Measure the dc voltage between the ground contact in printer well and pin 3 of the J1 connector. The J1 connector is the smaller of the two groups of pins in front of the printhead. Pin 1 is on the left, counting left to right. The voltage should be 3.00 vdc or less.
6. Making sure the red capped lever at right of printhead is pushed all the way toward the back of the printer, hold down the feed button. The paper should advance steadily forward.
7. Hold down feed button, then press and release the stop button. The paper should automatically feed in the reverse direction. Release the feed button. Paper will stop feeding.
8. Push the print button. The unit should beep, indicating that it has no data. The data light should remain unlit. 9. Download data into printer by placing spirometer handle, in on state, with data in it, into the printer well. The data light should flash repeatedly for several seconds. After this, the data light should be lit.
10. Make sure all dip switches on bottom of printer are set to the “off” position. On top of printer, set the following: Age: 36; Height: 159; Race: 2; Sex: F. Depress and release the print button to obtain a printout. The printout should agree with the settings. Also, the standard printed should be Knudson 1976 (dip switches 1 and 2 in off position), short form (dip switch 3 in off position), and the flow over volume graph (dip switch 4 in off position).
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Service Manual 610132 Rev. E
Section 2 - Service 11. Set dip switches on bottom of printer to “on” position. On top of printer, set the following: Age: 59; Height: 96; Race: 1; Sex: M. Depress and release the print button to obtain a printout. Observe printout. The printout should agree with the settings. Also, the standard should be Euro CCS (dip switches 1 and 2 in on position), the long form, which is a questionnaire (dip switch 3 in on position), and the volume over time graph (dip switch 4 in on position).
12. Return dip switches to position they were when unit came in from customer. If unit is a loaner, or a new unit being returned to stock, set all dip switches to off position.
13. Hold down the print button and press/release the stop button. Release the print button. A test printout should print. At right side of top line, check the version of software. It should be V3.2. If it is V3.1, it needs to be changed. The “PROM” that controls this is in position U5 on the main pcboard. Replace existing Prom with part number 610102-506. This Prom is software version V3.2.
14. Perform agency tests on printer. These include the ground continuity test and the leakage current test. If the main pcboard, transformer or line filter was replaced, perform the hypot test. Observe standards. They are: Ground continuity test: .2 ohm maximum resistance with 10 amperes of current flow through the earth ground line from the wall plug to a distant metal point on the unit, probably the transformer screw opposite where the ground wire is connected; Leakage current test: 100 microamps or less from any dead metal part on printer to earth ground, with the printer ungrounded and powered up. Hypot test: 1200 vac across the hot and neutral (tied together) and earth ground for one second without breakdown (voltage reduction).
Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 19
Section 2 - Service 15. This concludes the printer bench test. Make sure there is an ample supply of paper in printer. When loading paper, feed about 2-3 inches, put leading edge of paper through paper cutter envelope before putting paper cutter in place. Any questions call Welch Allyn Technical Service at 800-535-6663, Technical Support.
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Service Manual 610132 Rev. E
Section 2 - Service
Required Tools:
1.
Compression ring tool - Welch Allyn tool number T8608
2.
Snap ring pliers (external) VACO #22
3.
#1 Phillips head screwdriver
4.
1/4 inch flat head screwdriver
5.
3/32" Hex Key
2.3 Tools and Test Equipment Listing
Required Test Equipment
1.
Merriam M131 Manometer with C34259 mount kit or Welch Allyn Pressure Applicator Box.
2.
Pressure Source - Welch Allyn number T9161
3.
0-7VDC Power supply with 100 mA current limit
4.
0-14VDC Power Supply
5.
0-50mADC ammeter
6.
0-14VDC voltmeter
Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 21
Section 2 - Service
2.4 TEST AND ADJUSTMENTS
PNEUMOCHECK HANDLE
A set of specification drawings have been included in Section 7 with reference made to them here. The following tests should be done before the unit is returned to the customer.
1
Calibrate and test the handle per specification drawing A01945. “Calibrating with Welch Allyn Spirometer.
2.
Perform all tests on specification drawing A01951, “Dynamic Waveform Testing”
For troubleshooting use, specification drawing A01943 has been included for testing at the PC Board Level.
PNEUMOCHECK PRINTER/ CHARGER
1.
Perform Dielectric Strength Test per: A00167- UL/CSA Models A00178- IEC Models
2.
Perform Leakage Current Test per A00171
3.
Perform Grounding Continuity Test per: A00172 - UL/CSA A02242 - IEC
4.
Perform all tests listed on A01958, “Base Final Testing”
For troubleshooting use, specification drawing A01946 has been included for testing at the PC Board Level.
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Service Manual 610132 Rev. E
Section 3 - Theory of Operation
3.1
Spirometer Circuit Description
3.2
Spirometer - Printer Circuit Description
3.3
Messages
Service Manual 610132 Rev. E
Theory of Operation
Pneumocheck Handle Printer/Charger 23
Section 3 - Theory of Operation
3.1
Spirometer Circuit Description
The handheld spirometer’s electronics are contained on two boards, designated the “Digital Board” and the “Analog Board”. The analog board contains the power control circuitry, as well as the analog signal amplifiers. The digital board contains the digital circuitry, as well as the front panel components.
General
The spirometer is designed to minimize power consumption by having four separate operational states:
a.
OFF When SW1 is off only the battery charge circuit is enabled. Only diode leakage current flows.
b.
ASLEEP In this state SW1 is on and Vcc is present but the processor is not running. The switched analog power is off. In this state: i. ii. iii. iv. v. vi.
CR1 is not oscillating RB is oscillating (100Khz) All port bits are tri-state except for P6 which has all bits low The data and address bus is passive The RAM is disabled (U5 pin 26 is low) TP6 is low
Normally in this state, since the LCD controller is running, there will be something on the display. The software can, however, intentionally blank the display.
c.
AWAKE In this state the digital circuitry is operating, but the analog power is off. This state is entered when the processor has some work to do.
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Service Manual 610132 Rev. E
Section 3 - Theory of Operation
In this state: i. ii. iii. iv. v.
VA+ and VA- are not present U12 and U13 are not powered U8 is not operating CR1 is oscillating (8Mhz) The CPU clock (pin 22 of U4) is running (2Mhz)
In normal operation this state will terminate and return to the sleep state as soon as the p r o c e s s o r has nothing to do, such as while it is waiting for a keypress. d.
FULL ON In this state all of the circuitry is turned on. The charge pump may or may not be operating.
If everything is correct the power consumption in the four states should be: State 1:
OFF: Less that 0.1ma, typ 0.001ma
State 2:
ASLEEP: Less than 2.5ma, typ 1.6 ma
State 3:
AWAKE: Less than 16ma, typ 10ma
State 4:
FULL ON: Less than 35ma, typ 25ma
2. Power Consumption
NOTE: That achieving these levels is both a hardware and a software function. Malfunctioning software can raise the power to as much as 5ma in State 2 and 70ma in State 4.
The maintenance mode of the spirometer allows it to be placed in each state for testing purposes. Service Manual 610132 Rev. E
Pneumocheck Handle Printer/Charger 25
Section 3 - Theory of Operation
3. Spirometer Power Circuit Description
The battery charge is supplied by U14 which is a voltage regulator wired as a 12ma current source. D6 and D7 provide reverse polarity protection. Transistor T1 is the source for the current used in the spirometer if it is turned on while plugged into the printer. Its output voltage is regulated by the zener D13 to a voltage which will reverse bias D18 while at the same time insuring that the voltage reaching U8 does not exceed its design limit of 10v. This means that the tested voltage at TP1 must lie between 7.7 and 9.6v with 14-20v applied to the DC jack. R22 and R23 divide the zener voltage to provide the sense voltage so that the processor can tell when DC is applied. This voltage should be between 4.20 and 4.85 volts with DC applied to the charging jack. This sense voltage is taken to pin 35 of the CPU and pin 1 of the U1. The raw power for the spirometer comes from either the battery via D18, or if DC is supplied, via T1. It goes through the ON/OFF switch SW1 to the 5v regulator 119. U9 also supplies the low battery warning if Vcc comes out of regulation. This will occur when the battery voltage drops below about 6.3 volts. Power for the analog sampling circuitry is taken directly from the battery so that it is impossible to test patients while powering the unit from the DC jack. T5 and T6 form a software controlled switch to turn analog power on only while actually needed and thus conserve battery power. This voltage will be on when CPU pin 2 is high. The voltage at the collector of T6 will be 6 to 10 volts when on, and can be easily tested at pin 1 or U1. This switched analog voltage is inverted by U8, which should have a visible charge pump oscillating at eight kilohertz across C18. It will develop at least -6 volts across C20.
The switched analog voltage and its inversion are regulated by U7, T3, and T4 to provide +/- 4 volts VA+ and VA-. R18 and R19 divide Vcc to provide a guide voltage. U7A and T3 use this voltage to give VA+. U7B and T4 invert VA+ to provide a matching VA-. 26 Pneumocheck Handle and Printer/Charger Service Manual 610132 Rev. E
Section 3 - Theory of Operation TP2 and TP3 should measure +/- 3.90 to 4.10 volts. These voltages power the pressure transducer as well a U10 to U11. The switched analog voltage is also, regulated by U15B and T2 to give an isolated 5v +/- 0.10 volts at TP6. This voltage powers the A/D and U12. Under the assumption that both devices will never be used at the same instant, this power is also used to supply U13 on units with a 610117-501 pressure transducers. Units with a 6010116-501 use Vcc. Since the reference voltage from the A/D and the reference voltage of the transducer are both derived from Vcc, any variations in Vcc are ratiometrically canceled out. U10 and U11 are powered by VA+ and VA- because they must deal with negative voltages. However, since VA+ is less than Vcc, they cannot swing the full voltage range of the A/D. Therefore, U15, the first amplifier stage, is powered by V+.
When pressure sensing, VA+ and VA- must be on. The output of the transducer is a small differential signal (0.45 to 0.9 mv/cm H2O) on a common mode signal of about -1 volts.
4. Spirometer Analog Circuit Description
U10 forms a differential amplifier with adjustable gain. U11B removes the common mode voltage, provides an appropriate level shift, and provides a further gain of 5x. The output of U11B is frequency limited to a few hundred hertz by C25. The bais voltage is supplied by a software charge pump. When appropriate software is running 0-1 Khz pulse train from pin 16 of the CPU charges C2 to 0-2 volts (TP4). U11A buffers this voltage and uses it to offset U11B.
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Pneumocheck Handle Printer/Charger 27
Section 3 - Theory of Operation The output of U11B (TP5) depends upon the particular transducer, the charge pump and the adjustment of R33 and R36. The nominal output is 0.125 volt with no pressure applied and 2.10 volts with a pressure corresponding to 12 L/S of airflow (approximately 6cm H2O). With no pressure and no charge pump pulse train TP5 will be in the neighborhood of 1 volt. U15A provides the final stage of amplification (2x). D9 clamps its input to prevent latch up when the output of U11B goes negative. With VA on, the charge pump operating and R33 and R36 adjusted. U15A drives the A/D channel 0 with 0.5 - 4.5 volts as the airflow in the sensor ranges from 0 to 14 L/S.
5. Spirometer Digital Circuit Description
The CPU, U2, has an address and data bus which connects it to a 32K RAM U4, and 8K RAM, U5. Control for these is performed by U3. D1 and C4 provide a power-on reset. Residual power is quickly discharged through SW1 and R3 to ensure that reset occurs every time the power is cycled. The A/D, EEPROM and LCD controller (U6) are serial devices connected to the CPU ports.
The “TEST” key is connected directly to a CPU interrupt input. The other interrupt input is shared by the “DATA” key and the DC sense line from the power supply.
In order to allow both positive and negative transitions of DC input to cause interrupts. U1B can be used to invert the DC sense signal under software control. U1A forms a latch which can be forced high or low by software. R2 keeps it latched which can be forced high or low by the software. R2 keeps latched high or low when the CPU goes to sleep and the P4,4 goes to the tri-state condition. 28 Pneumocheck Handle and Printer/Charger
Service Manual 610132 Rev. E
Section 3 - Theory of Operation
First, there is a signal from pin 5 of U9 which will go low if Vcc comes out of regulation. This will occur if the battery voltage falls below about 6.3 volts, depending on the load.
6. Low Battery Detection
In normal operation Vcc coming out of regulation will be detected as soon as a key is pressed and the CPU wakes up again. No detection is made while the unit is waiting for a key press because the CPU is ASLEEP. Another situation which can occur is that the battery is failing but Vcc has not yet come out of regulation. This condition is determined by software control of T7, which, when ON, couples VA+ into A/D converter channel 1. This allows VA+ to be compared to Vref = Vcc, from which it is possible to detect a failing battery. This case is only detected when the spirometer enters the “STEADY” phase at the start of a test. This condition occurs when the battery voltage falls below about 6.2 volts. Note that the latter form of low battery condition is “temporary”, because when it is detected the “LOW BAT” warning is given and analog power is turned back off again. If Vcc is still good the “LOW BAT” message goes away again after several seconds and the unit returns to “SELECT”. A unit in this condition cannot perform further tests, but it can retain, review, and transmit an existing test. Due to the sharp decay rate of NI-CAD batteries, this interim state will exist for only a short time. Before long, Vcc will come out of regulation and the “LOW BAT” condition will become permanent. The operation of the low battery detection can be tested in maintenance mode by varying the voltage applied to the battery terminals while operating the unit.
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Pneumocheck Handle Printer/Charger 29
Section 3 - Theory of Operation
3.2 Spirometer - Printer Circuit Description 1. Digital Circuit Desription
This board is based on the Mitsubishi 50734 processor which has an integral stepping motor driver, a UART and a four channel 8 bit A/D converter. This makes the digital circuitry very simple. The printer mechanism has the thermal head driver internal to it, so the interface to the processor is simple and direct. The head temperature must be monitored by the processor so that the head pulse width can be controlled to produce a consistent end image at any temperature. In this circuit the head thermistor is balanced against an adjustable resistor which allows us to trim each unit for variations in the head and thermistor without trimming the timing constants within the software. The software is designed to prevent driving the head when the thermistor reading is out of range. By using other analog channels for “Head-up” and “Papersense” we avoid the need for logic level converters on these lines. The printer mechanism prints 256 dots per line in four distinct banks of 64 dots. The signals DST1 through DST4 select the bank. The data for each bank is loaded serially from the processor using the CLK, DIN, and LATCH signals. The ENABLE signal protects the element heaters during CPU reset cycles. In order to achieve maximum printing speed, the printing actually occurs while the paper is moving smoothly. Thus the printed horizontal lines are actually less diagonal. The UDS 5707 serves to buffer the paper drive motor signals. D12 clamps the inductive surges. A port bit is used to disable the motor drivers when they are not being used. CPU pin 22 must be high to enable the motor. On newer boards this buffer is an SN 75437 (P/N 761181-501), and performs the same function. The front panel is a simple matrix of switch closures isolated with doides. The options DIP switch is handled in the same way.
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Section 3 - Theory of Operation
The two inverters connected to the CPU pin 23 functions as a latch which powers up in the low state but which can be forced to a latched high state by software. It is used to provide a reliable mechanism by which the software can distinguish between power-up reset and a reset caused by the front panel reset key. The three inverters connected to CPU pin 20 provide enough drive to illuminate the front panel “ready” LED directly. The alarm device is an electromagnetic transducer. It requires a transistor to drive it. D1 clamps inductive surges. Communication with the spirometer is handled by protected direct UART connections. The signals are standard asynchronous ASCII at 4800 baud, however, the levels are CMOS logic levels, not RS232 level.
The printer power supply provides 24 volts at 3 amps peak. 5 volts at 200ma, and 14 volts at 100ma. The 24 volts output is regulated with a switching power regulator while the 5 and 14 volt supplies utilitize linear regulators. The present design incorporates a transformer that allows a primary voltage of either 90 to 132 vac or 200 to 275 vac.
2. Printer Power Supply Circuit Description
The switching regulator IC has a maximum allowable supply voltage of 50 volts. The minimum output voltage for the 24 volt supply that will ensure proper printer operation and print contrast is 22 volts. Using a transformer with a nominal 25 volt secondary and a full wave bridge rectifier result in a voltage range of 27 volts to 43 volts at the regulator when the input voltage varies through the specified range. The switching oscillator frequency is determined C17 and R32 which were selected to provide a 20Kh rate.
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Section 3 - Theory of Operation
The 24 volt output is fed into a divider network made up of R27 and R28. The output of the divider network is then fed into the error amplifier, ERR1. The 5 volt reference voltage is reduced through a divider made up of R37, R38, and R39 to 2 volts, and also fed into ERR1. The difference voltage is then used to correct the 24 volt output voltage. The output current is limited to 2.5A by comparing the voltage across R29 and to the 0.5 volt output of the reference divider network. A soft start circuit made up of C18, R31, and R38 causes the regulator to wait about 50 clock cycles before the transistor control pulse width is increased to its normal duration.
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Section 3 - Theory of Operation
3.3 Messages The following is a tabulation of the various messages that may be displayed by the spirometer and/or printer by the printer:
Quality Messages
Indicates that this test has a greater FVC+FEV1 than the one currently in memory. It will replace the stored test.
NEW BEST
Indicates that this test is close to but not better than, the currently stored best test.
MATCH
Indicates that this test has a lower FVC or FEV1 by at least 5%, and will not replace the existing best test. To correct this, inhale more fully before blowing, and blast out harder at the start.
NO MATCH
The effort was good. (A “good” test is one with no identifiable faults.)
GOOD FVC
The patient coughed during the maneuver or flow was interrupted, or uneven. To correct this, the patient should refrain from coughing.
COUGH
5% or 0.1 liters of exhalation occurs before the back extrapolation point. (ATS specification.) To correct this the patient should blast out harder at the beginning of the maneuver.
BAD. START
The flow stopped abruptly. To correct this. The patient should keep blowing longer.
BAD.STOP
Low flow effort. To correct this, the patient should blast out harder.
WEAK TRY
The maneuver was less the 3 seconds long. To correct this, the patient should inhale more deeply and blow out longer. If this message is displayed during an MVV maneuver, the maneuver was less than 6 seconds long, and the patient should continue longer.
TOO.SHORT
The effort was good.
GOOD MVV
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Section 3 - Theory of Operation GOOD CAL
Each of the 3 calibration maneuvers was within 1/2% of the average. The existing calibration factor will be replaced with the cal factor from this calibration.
CF=XXX
Shows calibration value after a successful calibration was completed. The value is now the new calibration value replacing the old one that was previously stored in memory.
RETRY.CAL
One or more of the calibration maneuvers exceeded the average by more that 1/2%. The existing calibration factor is not updated. Test Values FVC x.xxx
In Liters
FEV1 x.xxx
In Liters
RATIO xx
% FEV1/FVC
MMEF x.xxx
In liters per second
PEF x.xxx
In liters per second
MVV xxx
In liters per minute
RATE xxx
In liters per minute
TIME xx.x
In seconds
Status Messages CLEAR
Appears when the power is recycled, indicating that the memory is cleared.
TEST.MODE
Appears briefly when entering the test mode of the device.
SEND FVC
Indicates that the spirometer is transmitting an FVC test to the printer base.
SEND MVV
Indicates that the spirometer is transmitting an MVV test to the printer base.
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Section 3 - Theory of Operation Indicates that the device has begun charging the spirometer batteries.
CHARGE
Asks the operator or patient to hold the spirometer steady (with no movement) while it references the machine to zero flow in order to establish a baseline for future data.
STEADY
Indicates that the spirometer is in the process of readjusting the nominal charge pump value for zero flow.
RETRIM
Appears briefly while the spirometer calculating the results of a test.
BUSY
Appears when the operator pushes the TEST key from the ready position. If the operator does not push the TEST key again within 2 seconds, the spirometer will conclude that an MVV test is desired, and will begin the MVV sequence.
FVC
Appears if the operator presses the TEST key again within 2 seconds, the spirometer will conclude that an MVV test is desired, and will begin the MVV sequence.
MVV
Appears if the operator presses the TEST key immediately after the MVV message is displayed. Once this message is displayed, if the operator does not press the TEST key again within 2 seconds, the spirometer will conclude that a calibration is desired, and will begin the calibration sequence.
CAL
If the operator presses the TEST key immediately after the CAL message, the spirometer will go back to READY. Asks the patient to perform the nth FVC maneuver. Tests are numbered, so that you can see which test you are on.
DO FVC n
Asks the patient to perform the nth MVV maneuver.
DO MVV n
Asks the patient to perform the nth calibration maneuver.
DO CAL n
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Section 3 - Theory of Operation Exception Messages FLOW LIM
The flow during a maneuver has exceeded the flow sensor’s capacity of 14 liters/second (minimum).
VOL LIM
The volume during a maneuver has exceeded the spirometers capacity of liters (minimum).
TOO SOON TX FAIL
Flow was present as a sampling started. Transmission failure.
NO DATA A
Maneuver was interrupted, such as by the press of a key or the detection of a low battery.
NO DATA B
FVC or MVV timed out - the maneuver did not start within 13 seconds after the beep.
NO DATA C
FVC terminated normally, but on analysis, no exhalation was found.
NO DATA D
The FVC maneuver appeared too short and/or fragmented; possibly coughing with no blow.
NO DATA E
The MVV did not have enough breaths to analyze.
NO DATA F
During the MVV, the breaths were too inconsistent or uneven.
NO DATA G
Maneuver analysis routine failed: unable to analyze the data.
Problem and Error Messages LOW BATT
The battery is too low to continue and requires recharging.
TEMP LIM
The temperature range of the spirometer has been exceeded. The acceptable operating range is between 59 and 105o F. The spirometer must be allowed to return to an acceptable temperature range before continuing.
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Section 3 - Theory of Operation The device cannot trim the baseline out. This is usually due to an abrupt thermal change. The machine must be allowed to return to an acceptable temperature range before proceeding.
TRIM LIM
Encountering either the TEMP LIM or TRIM LIM messages during normal operation may indicate a possible hardware failure. The spirometer failed to see a stable baseline value within 30 seconds.
UNSTEADY
Bus error.
ERROR 0
EEPROM check sum error. (This will occur once upon first use of a new machine).
ERROR 1
Out of memory.
ERROR 2
Opcode error--another form of bus error.
ERROR 3
Interrupt timing error.
ERROR 4
EEPROM failure.
ERROR 5
Spurious interrupt.
ERROR 6
Error numbers greater that these indicate an unexpected event in the program. In general, error messages are probably caused by a hardware failure.
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Section 4 - Troubleshooting
Troubleshooting 4.1
Technical Troubleshooting
4.2
Customer Service Questions and Answers
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Section 4 - Troubleshooting 4.1 PneumoCheck Handle Technical Troubleshooting Model Number: 61001
(Most frequent problems at top)
Complaint 1. Reads unsteady
2. Reads 'NO DATA B'
3. Does not transmit (Tx fail)
4. Reads 'LOW BAT'
5. Will not power up (energize)
6. Reads error 5
7. Reads error 25
C au se
Corrective Action
A) Defective transducer
A) Replace transducer
B) Defective 766 regulator
B) Replace 766 regulator
C) Broken transducer wire
C) Restore conections
A) Defective transducer
A) Replace transducer
B) Broken transducer wire
B) Restore connections
A) Wrong side contact position
A) Reposition contacts.
B) Dirty contacts
B) Clean contacts
C) Broken wire in handle
C) Restore connections
A) Failed batteries
A) Test/replace batteries
B) Corroded battery/contacts
B) Replace corroded items
C) Defective component no voltage at TP 6
C) Replace U8, D18, or U12. Check for cold solder joints. Restore joints
A) Low battery voltage
A) Test/replace batteries
B) Corroded battery contacts
B) Replace corroded items
C) Dirty/corroded Pneumotach contacts
C) Clean dirty contacts. Replace corroded contacts
D) Failed D18
D) Replace D18
E) Failed On/Off Switch
E) Replace On/Off Switch
A) Low battery voltage
A) Recharge battery. Replace defective battery
B) Cold solder joint at J1 connector digital board
B) Restore solder joint
C) Failed ribbon cable
C) Replace ribbon cable
D) Cold solder joint on Processor
D) Restore solder joint on Processor
E) Failed U12 ADC
E) Replace U12 ADC
A) Old software
A) Upgrade to new software
B) Failed temp. sensor
B) Replace temp. sensor
C) High ambient temp.
C) Move to cooler room and cool unit down
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Section 4 -Troubleshooting PneumoCheck Handle Technical Troubleshooting Model Number: 61001
Complaint
C au se
Corrective Action
8. Reads 'TEMP LIM' (New software)
A) Failed temp. sensor
A) Replace temp. sensor
9. Reads error '1'
A) Failed U13 EPROM
A) Replace U13 EPROM
10. Reads error 35
A) Failed prom
A) Replace programmed prom
11. Segments out
A) Old style On LCD
A) Replace digital PCB digital board
B) Dirty LCD contact(s)
B) Clean LCD contact(s)
A) Failed transducer
A) Replace transducer
B) Failed Pneumotach
B) Replace pneumotach
C) Loose mouthpiece hose
C) Tighten hose
A) Noisy voltage (+4 and/or -4)
A) Check capacitors C12, C14, C15, C 19, C 20
B) Failed capacitors or solder
B) Check restore connections
A) Unit not seated in printer
A) Remove and reseat handle
B) Defective D18
B) Replace D18
C) Defective D7
C) Replace D7
D) Defective U14
D) Replace U14 LM317
12. Reads 'RETRY CAL'
13. Unstable on reading Will not calibrate
14. Fails recharge test
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Section 4 -Troubleshooting PneumoCheck Printer Troubleshooting Model(s): 76101 (Most frequent problems at top)
Problem 1. Blown fuse
2. Does not advance paper
3. Will not power up (energize)
4. Bad or incomplete printout
5. No "Beep" signal on start up
6. Does not print proper age/ height format
7. Does not print proper race/ sex format
8. Does not print proper options format (sw1)
C au se
Corrective Action
A) Line surge, open fuse(s)
A) Replace fuse(s)
B) Shorted U7. Switching voltage regulator, 761099-1
B) Replace U7 regulator
C) Shorted C17 capacitor (2.2 uf 50v)
C) Replace C17 capacitor
A) Failed print head motor section
A) Replace print head
B) Defective J1 ribbon cable
B) Repair or replace J1
C) Low +24v supply
C) Replace U7 and/or other associated failed part
D) Failed U6 driver
D) Replace U6 driver
A) Open fuse(s)
A) Replace fuse(s)
B) Failed U7 regulator
B) Replace U7 regulator
C) Loose crimp on wire at P4 connector
C) Recrimp wire at P4
A) Failed printhead PN 761085
A) Replace printhead
B) Failed J2 ribbon cable
B) Replace J2 ribbon cable
C) Cold V1 solder joint at processor
C) Repair solder joint
D) Failed U1 processor
D) Replace U1 processor
A) Bad joint at U1, U3, U4
A) Repair cold solder joint
B) Failed U5 prom 610102-506
B) Replace U5 prom
C) Shorted print head
C) Replace print head
D) Failed CR1 crystal
D) Replace CR1 crystal
A) Cold solder joint on rotary switch A) Repair solder joint board B) Failed diode on rotary switch board
B) Replace failed diode
A) Cold solder joint on control pcb
A) Repair solder joint
B) Failed diode on control pcb
B) Replace failed diode
A) Cold solder joint at sw1 or associated diodes
A) Repair cold solder joint(s)
B) Failed sw1 or associated diode
B) Replace sw1 or associated diode
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Section 4 -Troubleshooting 4.2 Customer Service Questions and Answers Reading On LCD Solutions Make sure they are not attempting to calibrate while the handle is in the printer well.
Calibration
Make sure they realize there is a CALIBRATION CHECK and a RECALIBRATION. When performing calibration, 3 liter syringe must be operated smoothly and evenly with consistent speed. Refer to pages 32, 33, 34, & 35 of operating instructions for the calibration instruction. The American Thoracic Society recommends checking accurancy of calibration daily. If documentation of the calibration check is required, insert the handle in the printer well and push print after a cal check had been completed. (Note: They cannot get a printout of the recalibration).
The pneumotach screen should be inspected daily and cleaned when necessary.
Cleaning & Sterilizing
We recommend cleaning and sterilizing the pneumotach assembly every 50 maneuvers. They can be steam autoclaved, ethylene oxide, soaked or boiled. Regardless of sterilization method, pneumotach must be completely dry before reusing. A wet or damp pneumotach inaccurate results. Four days air drying time is required, or 10 minutes with a hair dryer on high. Display Blank (Or Fading)
Handle must come back for repair. The handle must come back for checking and repair.
Erroneous Results
Turn the unit off, then on again. It may reset itself. If not, it is a hadware problem-handle must come back for service.
Error 5
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Section 4 -Troubleshooting Error 23
Error 25 Or Temp. Lim
Infrequently customer complains of Error 23. Have them turn handle off/on to see if it will reset-perhaps leave for a couple minutes and try again. In talking the Tech. Rep., they have not been able to duplicate problem inhouse. Customer must return both handle and printer for service. This is a temperature problem. Is the office extra warm (cold) today? Is the unit sitting in direct sun, near heat register, etc.? Advise to put the handle on the desk for a minute before attempting a test - it should be OK. If the error message continues and creates a problem they may return handle for new software update (3.5) It was also discovered Error 25 could indicate low battery. Change batteries.
Forced Vital Capacity
The amount of air that can be exhaled during a rapid forced exhalation. (1 long, hard blast)
Getting the Wrong Graph
Have them check the bottom of the printer, “flip” the 4th switch the opposite way, and see it that corrects the situation.
Green Data Light on Printer
This indicator light will be lit as long as there is information on the printer. If they want to clear the printer entirely, it must be unplugged. If the customer has entered incorrect data in the height or age, and the patient data is still in the printer, all they need to do is insert correct info and push print.
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Section 4 -Troubleshooting Are batteries within warranty? Check battery voltage should be 3.5 volts.
Low Batt Message
Are the printer & handle power lights (orange) on? Put in charger overnight, try again. Has it been in the printer charger? If error 5 appears after unit has been in printer for more than 3 hours, let unit cool down. If error 5 goes away, there is a hardware failure, unit must be returned. Make sure the contacts in the pneumocheck assembly are making good contact with the batteries. Clean contacts. If necessary, return handle & printer for checking.
The largest column of air inhaled and/or exhaled over a timed period. This maneuver imitates rapid breathing. The maneuver did not start within 20 seconds after the “beep”.
Maximum Voluntary Ventilation
No DATA B
Have them try again, watching the display carefully. If a problem, return handle. The problem is due to the information the user entered into the printer:
No % Or Norms on Printout Page 54 in Operating Instructions
The AGE of the individual is outside the limits built into the predicted values (for Knudson 3, the limits are age 5 to 83 for males and 87 for females). These can be found on Pages 54 through 58 of the operating instructions. Pages 52 & 53 of the operating instructions gives the formula for calculating predicted values manually. Or the HEIGHTis entered wrong. You can use either inches or centimeters, and in using inches the “O” must go in the first space. Example: Patient is 5 foot 6 inches tall. Info entered into machine: 066
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Section 4 -Troubleshooting No % Or Norms on Printout Page 54 in Operating Instructions cont’d
Pneumocheck handle is in test mode-you will received no % norms in the print-Turn on w/out buttons depressed. Remove handle-turn unit off turn handle on into normal mode.
No Power to Printer
They may have blown a fuse.
No Print on Printout
Make sure the paper is inserted correctly. If cannot be corrected, printer must be returned for service.
Paper Replacement
Remove printer cover. Feed any remaining paper through printer. DO NOT PULL PAPER BACKWARDS THROUGH THE PRINGER. Save black plastic spindle. Put red lever all the way forward. Place new roll of paper in the printer well. The paper feeds forward from the bottom of the roll. Insert edge of paper under the gray rubber pinch roller until paper exits top of printer. Push red lever as far back as possible. Press FEED button to feed paper through. Replace printer cover.
The printer does not store more than one patients Data The printer saves only the best test.
If the doctor wants a printout of all the tests on a patient, they have to run a test, print it out, then turn off the Pneumocheck and start over again as a new test.
THE PNEUMOCHECK HANDLE SHOULD BE LEFT IN THE OFF POSITION TO KEEP THE BATTERY FULLY CHARGED AT ALL TIMES. THE PRINTER SHOULD BE LEFT PLUGGED IN. 46 Pneumocheck Handle and Printer/Charger
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Section 4 -Troubleshooting On the bottom right hand corner of the printer, there are 4 little dip switches.
Printer Options
1 & 2 control the predicted 3 indicates long or short form 4 indicates volume/time or flow/volume graph. Refer to page 24 of operating instructions. When the machines leave the factory, they are set with all the switches in the off position, i.e., they are set for the Knudson 83 predicted values, short form, and flow/volume graph. The norms that are selected, together with the version of software in the machine print out on each tape. This is located just below the actual values. Example: NORMS: KNUDSON 1983 (VS35P31) (The “S” means handle, “P” means printer)
The message “Retrim” in itself is no problem. They MUST let the unit work thru this step. If they turn it off, they will only get retrim the next time they go to do a test. The retrim mode lasts 45 seconds to 1 minute, then it will advance to “do FVC”. (Sometimes I have found it necessary to have the customer get the instrument into “retrim” mode and time with a watch. It may seem like an eternity, but actually will be within the 1 minute range).
Retrim
Retrim only means the instrument is trying to establish the baseline. It will not go into this mode each time they want to do a procedure. If retrim occurs regularly, or if it will not advance after the 1 minute, handle must be returned for service.
The Welch Allyn PnuemoCheck complies with American Thoracic Society OSHA UL CSA IEC Service Manual 610132 Rev. E
Standards Compliance
Pneumocheck Handle Printer/Charger 47
Section 4 -Troubleshooting Trim.Lim
TX Fail (Transmission Fails)
Handle cannot trim the baseline. May be due to an abrupt thermal change or weak battery. If not, may be hardware failure. If so, turn handle off/on. If unit does not clear, return for service.
Broken or bent contact in handle or printer? Push paper feed button - Does paper feed through machine.
If not: Is there paper in the machine? Is paper tension lever (red, near paper roll) pushed back all the way? Make sure that paper is properly fed. There could be a paper jam. To clear: Depress STOP & FEED buttons simultaniously. Release STOP button. This will feed paper backwards. Release FEED button. This should clear the jam. Depress FEED button - paper should flow through OK. Printer does not advance paper and/or unit grinds or strains when the feed button is depressed. As a “last ditch” effort, unplug the printer ar the back and plug it in again - this should reset the machine.
Unsteady
While in the “steady” mode, was the handle moved? If not, problem could be a bad tranducer - handle must be returned for repair.
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Section 5 - Disassembly and Repair
Disassembly and Repair 5.1
Pneumocheck Handle
5.2
Pneumocheck Printer/Charger
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