Service Manual
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Service Manual
Micro Tymp 2 Tympanometric System 23640 handle, 71170 printer charger (Includes CE Model)
4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Part #: 236409
Copyright 1995
Part
Rev
Desc. of Change
ECN #
Date
Initiator
236409 236409
B C
New Release Added CE Updates & Cautions
5-28225 5-35489
6/95 6/97
R. Settembre R. Settembre
NOTE: Drawings & illustrations in this document are for reference only. Consult system or call factory for latest revisions.
MICROTYMP 2
SERVICE MANUAL
Micro Tymp 2 Tympanometric System 23640 handle, 71170 printer charger (Includes CE Model) Copyright 1995 Welch Allyn Co. 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220
Welch Allyn Service Manual Part #:236409
FORWARD This manual provides technical assistance for calibrating, diagnosing, and servicing the Welch Allyn MICROTYMP 2 handle and Printer/Charger. The MicroTymp 2 and or Printer Charger will be returned to the Technical Service Department for either Recalibration (handle only) or for diagnosis and repair. For Printer Charger tests, refer to current factory approved diagnostic tests. Once the fault has been determined, refer to the Manual chapters I and J for the appropriate Removal and Replacement sequence. Re-test the Printer Charger after the repair is completed. Similarly, when servicing the MicroTymp 2 handle, refer to the most recent troubleshooting guide and Calvin Users guide. Once the failed component has been identified, refer to the Manual chapters B through H for the appropriate Removal and Replacement sequence. Re-test (re-calibrate) the handle once the repair has been completed. The repair ‘TASK’ procedures (R & R .. Removal and Replacement) are written to provide quick and easy reference for different experience levels of repair technician. Required specifications and materials are listed at each step where applicable. For example: Instructions will start off with a “TASK, TO DO.” For example, B. 3. “Unplug Flex Circuit” statement. This will be followed by a “TECHNIQUE, HOW TO DO” statement. Follow these steps to preform the task.- “Grasp pump assembly flex circuit with pin straightening pliers.” This manual is written in a style useful for training and or translation. Set up training sessions to allow the trainee to practice the use of the diagnostic, repair, adjustment, and re-testing procedures found in this manual. Set up hands-on practice sessions to enable the technician to develop and retain skills. Provide each trainee with the opportunity to practice the procedure(s) after it has been demonstrated by the instructor. IMPORTANT: Welch Allyn service part numbers and material numbers appearing in this manual are for the purpose of familiarizing new technicians with the Welch Allyn parts numbering system. Order replacement parts, as always, by referencing your latest bill of materials, parts catalog and assembly drawings. Part number changes, product updates, or new test procedures should be noted on the appropriate page of this manual by the manual owner.
i
*** SAFE SERVICE *** CLEAN AND DISINFECT per instructions in MicroTymp2 Operating Instructions PN 236311 PAGE C-50 prior to repairing, or calibrating all returned MicroTymp 2’s. PERFORM appropriate “A” tests after servicing to assure safe, accurate and reliable product operation.
*** QUALITY SERVICE *** WEAR an ESD wrist strap when servicing the MicroTymp 2 or handling printed circuit boards. STORE new and used boards in anti-static bags. UPDATE your Repair & Training Manual by notating changes and revisions of part numbers and procedures. READ AND UNDERSTAND customer comments and complaints on accompanying documentation (P.O. or other correspondence). If an injury, illness to patient or user, or hazardous malfunction has occurred or is suspected, PROCEED NO FURTHER ! DO NOT disassemble, repair, adjust, or in any way alter the MicroTymp 2 or the printer charger base ... instead, notify your supervisor at once. Give them all accompanying paperwork and any information you might have on the return. They will take appropriate action according to Welch Allyn policy. Check customer service records to determine if this MicroTymp 2 requires or has received any applicable retrofit modifications, improvements, or inspections, and perform these if required. INSPECT AND TEST it before and after it is repaired. Documentation should include: general condition, defects, missing components and labels, electrical, functional and mechanical problems. Operate the returned instrument to try to duplicate the customer’s complaint before and after it is repaired.
ii
TABLE OF CONTENTS / MICRO TYMP 2 Forward
--------- i
Safe Service
- - - - - - - - - ii
Section 1 Removal and replacement ( r & r ): A Normal maintenance
--------- 1
B
Power supply board assembly
--------- 2
C
Motor/pump assembly
--------- 3
D
MCU Board assembly
--------- 3-4
E
Keypad assembly
--------- 4-5
F
LCD Assembly
--------- 5
G
ESD Shields
--------- 6
H
Valve
--------- 7
I
Ballast
--------- 7
J
Printer / charger keypad
--------- 8
K
Printer and or PCB
- - - - - - - - - 8 - 10
Section 2
Preliminary Handle Bench Test
Section 3
Micro Tymp 2 Noise Test Procedure
Section 4
Technical Troubleshooting Guide for Micro Tymp 2 Handles & Printer Chargers
Section 5
Customer Service Questions/Answers
Section 6
CALVIN, Micro Tymp 2 Calibration System User Manual
Section 7
Micro Tymp 2 NEEDS CAL Error Troubleshooting Guide
Section 8
Tools/Test Equipment listing Calvin Components
Section 9
Repair Parts
Section 10 Drawings Section 11 A-02727 Process Sheet excerpts for 23641 Micro Tymp 2 Handle tests Section 12 A-02728 Process Sheet excerpts for 71171, 71172, 71174, 71176, 71179 Micro Tymp 2 Printer Charger Tests
A
NORMAL MAINTENANCE :
BATTERY COVER, BATTERY, RECHARGING BATTERY, RECYCLING THE USED BATTERY
A
1. REFER TO PAGE C-43 THROUGH C-47 OF MICROTYMP 2 OPERATING INSTRUCTIONS FOR REPLACEMENT OF BATTERY PN72900.
WARNING: INSERT BATTERY ONLY AS SHOWN IN THE OWNERS MANUAL. FAILURE TO OBSERVE CORRECT POLARITY COULD CAUSE DAMAGE TO THE MICRO TYMP 2. WHEN IT IS NECESSARY TO REPLACE THE BATTERY, USE ONLY A WELCH ALLYN PN72900 REPLACEMENT BATTERY. OTHER NON APPROVED BATTERIES MAY CAUSE RISK OF FIRE OR PRODUCT FAILURE. CAUTION: The battery must be removed if the MicroTymp 2 is to be stored or placed anywhere other than in the Charging Stand (or connected to the Charging Transformer) for more than one month. Failure to do this can result in damage to BOTH the battery and the MicroTymp 2. A
2. FOLLOW THIS PROCEDURE FOR DECIDING WHEN TO REPLACE THE NICAD BATTERY IN A MICRO TYMP HANDLE: (AS ALWAYS, READ THE CUSTOMER COMPLAINT FIRST.)
SCENARIO 1
If the unit FUNCTIONS, (the battery has held sufficient charge during approximately two days transit) the battery meets requirements. No corrective action is to be taken. However, it is good practice to put the battery on charge for however long it is in your possession. OR
SCENARIO 2
a
If the unit DOES NOT FUNCTION AND the battery is IN warranty, put in a fully charged new battery (your test battery). If the unit functions, and Low Battery symbol disappears, REPLACE THE BATTERY UNDER WARRANTY. Install a fully charged BATTERY. Recycle the failed battery per Welch Allyn’s recycling policy.
2
b
If the unit DOES NOT FUNCTION AND the battery is OUT of warranty, put in a fully charged new battery (your test battery). If the unit functions, sell a new battery. If the unit does not function, look for other problems while charging the customer’s battery. Sell a new battery if customer’s battery won’t ACCEPT AND HOLD a full charge.
NOTES: ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ 1
C
MOTOR/PUMP ASSEMBLY
C
1.
REMOVE BATTERY COVER AND BATTERY. UNSCREW BATTERY COVER SCREW AND REMOVE THE COVER. REMOVE THE BATTERY FROM THE BATTERY HOLDER.
C
2.
REMOVE FRONT HOUSING ASSEMBLY. PEEL THE WELCH ALLYN LABEL FROM THE UNIT AND UNSCREW TWO SCREWS UNDER THE LABEL. REMOVE THE FRONT HOUSING ASSEMBLY FROM THE HANDLE. DO NOT UNPLUG FLEX CIRCUIT FROM LCD BOARD. NOTE: If unit is a CE model, take caution in removing the front housing. There are two pieces of fragile ESD tape at both corners.
C
3.
REMOVE TUBING FROM MOTOR/PUMP ASSEMBLY. PULL TUBE FROM THE PUMP. PULL TUBE FROM THE BALLAST. DISCONNECT FLEX CIRCUIT FROM SWITCHES BOARD AND POWER SUPPLY BOARD. GENTLY LIFT MOTOR/PUMP ASSEMBLY UP. REPLACE MOTOR PUMP ASSEMBLY
C
4.
REPLACE MOTOR/PUMP ASSEMBLY. INSTALL REPLACEMENT PRE/ADJUSTED MOTOR/PUMP ASSEMBLY OVER LCD RETAINER. RE-ATTACH FLEX CIRCUITS TO POWER BOARD AND SWITCH BOARD. USE PIN STRAIGHTENING PLIERS OR FINGERS TO RE-ATTACH FLEX CIRCUITS. RE ATTACH FRONT HOUSING ASSEMBLY. LAY FLEX CIRCUITS IN ACCORDING TO DRAWING #236300.
C
5.
CALIBRATE HANDLE WITH CALVIN. REFER TO SECTION 6 FOR CALVIN PROCEDURE. UPON SUCCESSFUL CALIBRATION AND TEST, PLACE A DROP OF BLACK MAX tm ADHESIVE M-30341 BETWEEN THE FRONT HOUSING AND THE FIBER STRIPS. REPLACE BATTERY AND BATTERY COVER. SCREW BATTERY COVER IN PLACE.
NOTES:________________________________________________________________________ ______________________________________________________________________________ D
MCU ( BOTTOM ) BOARD
D
1.
REMOVE POWER SUPPLY BOARD ( TOP BOARD ). FOLLOW INSTRUCTIONS IN SECTION B FOR REMOVAL OF POWER SUPPLY BOARD.
D
2.
UNPLUG FLEX CIRCUIT FROM MCU BOARD ( BOTTOM BOARD ). USE PIN STRAIGHTENING PLIERS OR FINGERS TO GENTLY PULL THE FLEX CIRCUIT FROM THE MCU BOARD SOCKET.
D
3.
REMOVE MCU BOARD. UNSCREW FOUR STANDOFFS WITH 1/8" NUT DRIVER. GENTLY PULL THE BOARD STRAIGHT OUT OF THE HOUSING. FOUR PLASTIC SPACERS ARE ATTACHED TO THE BOARD AT EACH SCREW HOLE. TRANSFER THESE TO THE REPLACEMENT MCU BOARD. 3
D
MCU ( BOTTOM ) BOARD
D
4.
REPLACE MCU BOARD. INSTALL FOUR PLASTIC SPACERS ON THE BOTTOM OF THE BOARD. INSERT REPLACEMENT BOARD INTO HANDLE WITH INFRA-RED LED AT BASE OF HANDLE FACING IR WINDOW. SCREW FOUR STANDOFFS INTO CORNERS OF MCU BOARD. TIGHTEN TO 1.5 TO 2 INCH LBS.
D
5.
PLUG IN FLEX CIRCUIT. CONNECT THE FLEX CIRCUIT TO THE MCU BOARD SOCKET. INSERT SIDE CONTACTS INTO THE SLOTS OF THE BACK HOUSING WITH THE BLACK WIRE ON THE RIGHT (BALLAST) SIDE, AND THE RED WIRE ON THE LEFT SIDE. TUCK CONTACT WIRES UP AGAINST BOTTOM END OF BATTERY RETAINER.
D
6.
INSTALL POWER SUPPLY BOARD. FOLLOW INSTRUCTIONS IN SECTION B FOR REPLACEMENT OF POWER SUPPLY BOARD. CALIBRATE UNIT USING CALVIN SYSTEM (CALVIN USERS MANUAL IN SECTION 6)
NOTES:________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ E
KEYPAD ASSEMBLY
E
1.
REMOVE FRONT HOUSING ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION C2 TO REMOVE FRONT HOUS-
E
2.
REMOVE MOTOR/PUMP ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION C3 TO REMOVE MOTOR/PUMP ASSEMBLY.
E
3.
REMOVE LCD MODULE SUPPORT FROM BACK HOUSING. UNSCREW TWO SCREWS AND LIFT SUPPORT DOWN AND AWAY FROM LCD MODULE. DO NOT ALLOW THE LCD DISPLAY TO FALL OUT OF THE BACK HOUSING. PRESS ANY BUTTON TO LIFT KEYPAD ASSEMBLY OUT OF BACK HOUSING.
ING.
REPLACE KEYPAD ASSEMBLY E
4.
REPLACE KEYPAD ASSEMBLY. INSERT REPLACEMENT KEYPAD ASSEMBLY INTO HOLES IN BACK HOUSING WITH LETTERS RIGHT SIDE ‘UP’. ALIGN LCD RETAINER OVER LCD AND KEYPAD ASSEMBLY AND INSERT LATCH OF RETAINER INTO NOTCH IN TOP OF BACK HOUSING. ALIGN 2 ALIGNMENT PINS ON THE BACK OF THE RETAINER WITH THE TWO ALIGNMENT HOLES IN THE KEYPAD ASSEMBLY PRINTED CIRCUIT BOARD. SECURE RETAINER WITH TWO SCREWS. 4
E
KEYPAD ASSEMBLY
E
5.
REPLACE MOTOR/PUMP ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION C4 THROUGH C6 FOR MOTOR/ PUMP ASSEMBLY.
E
6.
TEST HANDLE. PERFORM FUNCTIONAL CHECKS TO ASSURE CORRECT OPERATION OF REPLACEMENT SWITCHES.
NOTES:________________________________________________________________________ ______________________________________________________________________________ F
LCD ASSEMBLY
F
1.
REMOVE LCD RETAINER. FOLLOW STEPS E1 THROUGH E3 TO REMOVE LCD RETAINER.
F
2.
REMOVE LCD MODULE. LIFT OUT LCD MODULE. REPLACE LCD ASSEMBLY
F
3.
PLACE LCD ASSEMBLY INTO BACK HOUSING. REMOVE PROTECTIVE FILM FROM BEZEL. RECORD LCD ID# ON DOCUMENTATION. ALIGN LCD ASSEMBLY WITH FLEX CIRCUIT CONNECTOR ON RIGHT HAND SIDE THEN PLACE INTO HOUSING.
F
4.
SECURE MODULE WITH RETAINER. PLACE LCD MODULE RETAINER AND PLACE LATCH IN THE NOTCH AT THE TOP OF THE BACK HOUSING. ALIGN TWO PINS ON UNDERSIDE OF RETAINER WITH TWO ALIGNMENT HOLES OF KEYPAD PCB. SECURE WITH TWO SCREWS.
F
5.
REASSEMBLE HANDLE. FOLLOW INSTRUCTIONS IN SECTION C 4 THROUGH C 6 AND PERFORM FUNCTIONAL CHECKS. END LCD ASSEMBLY REPLACEMENT
NOTES:________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ 5
G
ESD SHIELDS (CE MODEL) REMOVAL OF ESD SHIELDS (SEE FIG. G-1)
G
1.
REMOVE POWER SUPPLY BOARD. FOLLOW INSTRUCTIONS IN SECTION B.
G
2.
REMOVE MOTOR PUMP ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION C.
G
3.
REMOVE MCU BOARD. FOLLOW INSTRUCTIONS IN SECTION D.
G
4.
REMOVE KEYPAD ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION E.
G
5.
REMOVE LCD ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION F.
G
6.
REMOVE ESD SHIELDS. THE LCD GASKET AND THE ESD SHIELD ARE CONNECTED WITH TWO STRIPS OF ESD TAPE. THESE ASSEMBLED SHIELDS SHOULD PULL OUT OF THE BOTTOM HOUSING.
NOTES:________________________________________________________________________ _____________________________________________________________________ REPLACEMENT OF ESD SHIELDS (CE MODEL) G
17.
REPLACE SHIELDS AS PER ASPEC A02727.
G
17.
REASSEMBLE UNIT. FOLLOW STEPS G1 THROUGH G6 IN REVERSE ORDER. FIG. G-1 HANDLE CE LABEL
6
H
VALVE
H
1.
REMOVE VALVE FROM POWER SUPPLY BOARD. REMOVE BATTERY COVER AND BATTERY FROM HANDLE. REMOVE POWER SUPPLY BOARD FROM HANDLE BY FOLLOWING STEPS IN SECTION B 1 THROUGH B 4. UN-SOLDER VALVE FROM FOUR CONNECTION POINTS UNDER THE POWER SUPPLY BOARD. LIFT VALVE FROM BOARD AND DISCONNECT TUBING FROM VALVE. REPLACE VALVE
H
2.
INSTALL REPLACEMENT VALVE. ATTACH TUBING TO PRE-TESTED, PRE-TRIMMED REPLACEMENT VALVE. PREPARE BOARD FOR RE-SOLDERING BY REMOVING EXCESS SOLDER AND CLEARING BOARD HOLES TO ACCEPT REPLACEMENT VALVE. INSERT REPLACEMENT VALVE IN PLACE WITH THE TUBE-END TOWARDS THE BALLAST. SOLDER THE VALVE IN PLACE. CLIP OFF VALVE LEADS ABOVE SOLDER JOINTS.
H
3.
INSTALL POWER SUPPLY BOARD INTO HANDLE. FOLLOW STEPS B 4 THROUGH B 5 TO INSTALL POWER SUPPLY BOARD.
H
4.
CALIBRATE HANDLE. FOLLOW CALVIN PROCEDURE TO CALIBRATE HANDLE. END VALVE REPLACEMENT
NOTES:________________________________________________________________________ I
BALLAST
I
1.
REMOVE BALLAST FROM POWER SUPPLY BOARD. REMOVE BATTERY COVER AND BATTERY FROM HANDLE. GENTLY PULL BALLAST FROM THE POWER SUPPLY BOARD. LIFT BALLAST FROM BOARD AND DISCONNECT TUBING FROM BALLAST. REMOVE DOUBLE SIDED TAPE FROM BOARD IF IT IS PARTIALLY TORN AWAY. REPLACE BALLAST
I
2.
INSTALL REPLACEMENT BALLAST. CLEAN BOTTOM OF BALLAST WITH ALCOHOL AND LET DRY ONE MINUTE. ATTACH TUBING TO REPLACEMENT BALLAST BY FIRST ATTACHING TUBING FROM THE PROBE TIP TO THE TOP END OF THE BALLAST. THEN ATTACH TUBING FROM THE VALVE TO THE TOP SIDEPORT OF THE BALLAST. ATTACH TUBING FROM THE PUMP TOP CAP TO THE LOWER SIDE PORT OF THE BALLAST. CLEAN MOUNTING SURFACE FOR REPLACEMENT DOUBLE SIDED FOAM TAPE. APPLY BROWN LAYER SIDE OF 2 SIDED TAPE TO BOTTOM OF BALLAST. ATTACH ADHESIVE BACKED WARNING LABEL TO SIDE OF BALLAST. CHECK ALL TUBING FOR SHARP BENDS, TWISTS OR LEAKS.
I
3.
CALIBRATE HANDLE. FOLLOW CALVIN PROCEDURE TO CALIBRATE HANDLE. END BALLAST REPLACEMENT 7
J
KEYPAD
J
1.
REMOVE KEYPAD. UNPLUG MICROTYMP 2 PRINTER/CHARGER FROM LINE VOLTAGE. PEEL OLD KEYPAD FROM PRINTER/CHARGER TOP PANEL USING FINGERNAIL UNDER ONE CORNER.
J
2.
UNPLUG FLEX CIRCUIT. GENTLY PULL FLEX CIRCUIT FROM BACK OF KEYPAD. REMOVE ANY RESIDUAL ADHESIVE FROM THE PRINTER/CHARGER TOP PANEL WITH ALCOHOL. WAIT ONE MINUTE FOR ALCOHOL TO EVAPORATE. REPLACE KEYPAD
J
3.
INSTALL REPLACEMENT KEYPAD. REMOVE ADHESIVE LINER FROM PCB. PLUG FLEX CIRCUIT INTO KEYPAD PCB. DO NOT TWIST FLEX CIRCUIT. POSITION KEYPAD BOTTOM EDGE WITH THE BOTTOM EDGE OF THE KEYPAD RECESS IN THE TOP PANEL. POSITION TWO SEMI-CIRCULAR DETENTES IN THE KEYPAD RECESS FIT INTO TWO SEMI-CIRCULAR CUTOUTS ON THE KEYPAD PCB. FEED THE FLEX CIRCUIT INTO THE HOLE OF THE TOP PANEL AS YOU PLACE THE KEYPAD AGAINST THE TOP PANEL.
J
4.
TEST PRINTER/CHARGER. PERFORM FULL FUNCTIONAL TESTS ON PRINTER/CHARGER. REFER TO SPECIFICATION A-02728 IN SECTION 12.
END PRINTER/CHARGER KEYPAD REPLACEMENT NOTES:________________________________________________________________________ ______________________________________________________________________________ K
PRINTER AND/OR PCB NOTE: A CE MODEL PRINTER (SEE LABEL) WILL CONTAIN MAIN PCB #711730-509. DO NOT REPLACE IT WITH A 711730-508 (NON CE BOARD). YOU CAN NOT UPGRADE A 508 BOARD TO A 509 BOARD. YOU CAN PUT A 509 INTO A UNIT IN PLACE OF A 508.
K
1.
REMOVE PAPER. REMOVE PAPER ACCESS COVER BY PULLING UP ON THE FRONT EDGE. PULL PAPER LEVER AND REMOVE PAPER ROLL AND SPINDLE.
K
2.
REMOVE TOP PANEL FROM CASE. REFER TO FIG. I-1 IN THIS MANUAL. DO NOT UNSCREW THE TWO SCREWS INDICATED ON THE DRAWING. THESE FASTEN THE PRINTED CIRCUIT BOARD TO THE LOWER HOUSING. UNSCREW THE SIX (6) REMAINING METAL PHILLIPS HEAD SCREWS AND ONE (1) NYLON NONCONDUCTIVE 3/16" HEX HEAD SCREW. USE 3/16" NUT DRIVER. TURN THE PRINTER/CHARGER OVER AND GENTLY LIFT THE TOP PANEL OFF. COMPARE ROUTING AND CONNECTION OF FLEX CIRCUITS TO ASSEMBLY DRAWING. INSPECT FOR TEARS AT THE PLUGS. UNPLUG THESE TWO FLEX CIRCUITS FROM THE PCB. REMOVE THE TOP PANEL. 8
K
PRINTER AND/OR PCB REPLACEMENT.
FIGURE I - 1 UNFASTENING TOP PANEL * * Unfasten the top panel by removing all screws as shown in the figure above, except the two screws marked with arrows. These two screws hold the PCB to the lower housing. Remove them if the PCB is to be removed after the top panel is off. NOTE: USE 3/16" NYLON HEX HEAD SCREW IN LOCATION AS SHOWN IN ABOVE FIGURE. TIGHTEN UNTIL HEAD OF SCREW IS IN CONTACT WITH CASE.
9
K
PRINTER AND/OR PCB
K
3.
REMOVE PRINTER AND PCB FROM PRINTER/CHARGER HOUSING. TURN THE HOUSING ON END AND SUPPORT THE PCB FROM WITHIN WHILE UNSCREWING TWO REMAINING SCREWS AND NUTS. LIFT THE PRINTER/PCB ASSEMBLY PARTIALLY OUT OF THE CASE TO ALLOW YOU TO DISCONNECT THE THREE POWER LEADS FROM THE EMI FILTER. BE CAREFUL NOT TO BEND THE DIP SWITCH ASSEMBLY.
K
4.
REMOVE PRINTER FROM PCB. UNPLUG CONNECTOR FROM PRINTER. PARTIALLY UNSCREW FOUR SCREWS ONLY AS FAR AS NEEDED TO DISENGAGE THE PRINTER. SLIDE THE PRINTER OUT FROM UNDER THE GEAR COVER. THIS METHOD WILL KEEP THE FOUR STANDOFFS CAPTIVE ON THE SCREW THUS ELIMINATING HAVING TO REPOSITION THEM WHEN INSTALLING THE REPLACEMENT PRINTER. IF YOU REMOVE THE FOUR SCREWS ENTIRELY, THE FOUR SMALL PLASTIC STANDOFFS WILL FALL OUT FROM UNDERNEATH THE BLACK PAPER WELL. IF THEY DO FALL OUT, ROTATE PAPER WELL OUT OF THE WAY AND USE SUPER GLUE TO HOLD STANDOFFS TO BOARD WITH 1/64" DOT OF GLUE TO THE STANDOFF. ATTACH STANDOFFS TO THE BOARD. ROTATE PAPER WELL OVER BOARD AND ALIGN HOLES WITH STANDOFFS. REPLACE PRINTER
K
5.
ATTACH REPLACEMENT PRINTER TO PAPER WELL/PCB. SLIDE REPLACEMENT PRINTER UNDER GEAR COVER AND ALIGN SCREW HOLES IN PRINTER WITH HOLES IN PCB/PAPER WELL. SECURE PRINTER TO PCB/BOARD ASSEMBLY WITH FOUR SCREWS. CONNECT CIRCUIT CONNECTOR TO PRINTER.
K
6.
REPLACE PRINTER/PCB INTO HOUSING. POSITION THE PCB OVER THE HOUSING AND CONNECT THE POWER LEADS TO THE EMI FILTER. SECURE THE PCB TO THE CASE WITH TWO SCREWS AND NUTS AS SHOWN BY ARROWS IN FIG. I - 1.
K
7.
ATTACH TOP PANEL TO CASE. POSITION THE TOP PANEL OVER THE CASE AND CONNECT THE KEYPAD FLEX CIRCUIT TO THE PCB. CHECK FOR TWISTS IN FLEX CIRCUIT. CONNECT THE CONTACT HOUSING ASSEMBLY FLEX CIRCUIT (BLACK SIDE FACING PRINTER WELL OR PIN 1 OF FLEX TO PIN 1 ON PCB) TO THE MAIN PCB. LOWER THE TOP PANEL SLOWLY AND MAKE SURE CONTACT HOUSING FLEX IS AROUND STANDOFF. REFER TO FIG. I-1 AND SECURE TOP PANEL TO THE CASE WITH SIX PHILLIPS HEAD SCREWS AND ONE 3/16" HEX HEAD NYLON SCREW. USE 3/16" NUT DRIVER AND SLOWLY TIGHTEN UNTIL THE HEAD OF THE SCREW CONTACTS THE CASE.
K
8.
INSERT PAPER AND PAPER ACCESS DOOR. REFER TO OPERATING INSTRUCTIONS PAGES C-48 AN C-49 FOR PAPER REPLACEMENT.
K
9.
TEST PRINTER CHARGER. FOLLOW INSTRUCTIONS A SPEC “ MANUF. INSTRUCTIONS STATION 5 TEST AND SHIP” IN SECTION 12. 10
SECTION 2 PRELIMINARY BENCH TEST FOR MICROTYMP 2 23641
•
• • •
Purpose of test: Tests MicroTymp 2 for: 1 Leaks, 2 Vent rate, 3 Noise, 4 Recharge, 5 Inactive current drain, 6 Active current drain. These tests help prevent aborted calibration cycles in Calvin, thus saving time. The technician can resolve MT2 handle problems before starting the recal process. How Performed: Perform tests in series in numerical sequence. When Performed: Before recalibration. Required Equipment: Welch Allyn Calvin Recalibration system, Digital Volt Ohm meter, Pressure Box T-5657 or equivalent pressure source (400 dPa max, with 1 dPa resolution on digital display), fully charged battery.
Test 1 Leaks 1.1 - Open MT2 and remove battery. 1.2 - Momentarily apply 7.2 VDC across valve coil to latch valve closed. See FIG 1.2 for polarity. 1.3 - Connect Pressure Box (T-5657) pressure tube to MT2 probe tip while valve is latched closed. 1.4 - Adjust pressure of T-5657 to 200 dPa and observe leak rate. Must leak less than 10 dPa in 5 seconds. 1.5 - Throw Pressure/Vent switch to V (vent). 1.6 - Throw Select switch to Negative. (This will cause meter to read positive with negative pressure.) 1.7 - Throw Pressure/Vent switch to Pressure 1.8 - Adjust pressure of T-5657 down to -400 dPa and observe leak rate. Must leak less than 10 dPa in 5 seconds. Apply 7.2 Volts D.C. momentarily to close valve. Valve will 'latch' and hold closed position. - 7.2 v + Valve Probe end
Empty Battery compartment
Figure 1.2 Closing Valve for leak check procedure.
1
Preliminary Bench Test for MicroTymp 2 23641 continued: Test 2 Vent Rate 2.1 - Momentarily apply 7.2 VDC across valve coil (with reverse polarity) to open (unlatch) valve. See FIG 2.1 for polarity. This will vent -400 dPa from step 1.8. 2.2 - Observe pressure reading on T-5657. Pressure should vent from -400 dPa to 0 dPa in 1 second or less. Apply 7.2 Volts D.C. momentarily to open valve. Valve will 'un-latch' and hold an open position. + 7.2 v - Valve Probe end
Empty Battery compartment
Figure 1.2 Opening Valve to test Vent Rate
Test 3 Noise 3.1 3.2 3.3 3.4
- Put .2 cc cavity onto the probe tip. - Take Tympanogram of cavity by depressing and releasing black test button. - Observe for noise. Repeat 5 times. - Observe the number of rows above baseline. None is ideal. One row is acceptable. Two or more lines above baseline is unacceptable and constitutes a failure. 3.5 - Repeat steps 3.2 to 3.4 with 1.0 cc, 2.0 cc and 2.4 cc cavities.
2
Preliminary Bench Test for MicroTymp 2 23641 continued: Test 4 Recharge 4.1 - Establish and maintain 7.2 VDC to handle charge contacts. Polarity is shown in FIG 4.1 4.2 - Snap the negative end of a fully charged battery into negative battery clips with the battery positive end tipped up at about 45 degrees. The positive spring must not touch the positive end of the battery. (only the negative end of the battery makes contact with the battery compartment negative contacts as shown in FIG 4.1 below. 4.3 - Connect Milliammeter ( - ) Negative lead to positive side of the battery as per FIG 4.1 below. 4.4 - Connect Milliammeter (+) Positive lead to the positive spring in the battery compartment as per FIG 4.1 below. 4.5 - Observe Ammeter reading. Current will be 60 mA +/- 5 mA. 4.6 - Remove Ammeter leads from circuit. 4.7 - Remove 7.2 volt power supply leads from handle charge contacts. 4.8 - Check resistance between the two side contacts. Value must read between 3.8 KV and 4.0 KV. If resistance is too low, check C17, C18 and C19.
60 mA – Milliamps + Valve Probe end
– battery
+ +
+ 7.2 v - applied to MT2 Figure 4.1 Recharge Current
3
Preliminary Bench Test for MicroTymp 2 23641 continued: Test 5 Inactive Current Drain 5.1 - Keep battery in partially installed position as in step 4.2 above. 5.2 - Connect Milliammeter ( - ) Negative lead to positive spring contact in the battery compartment as per FIG 5.2 5.3 - Connect Milliammeter (+) Positive lead to positive side of battery . FIG 5.2 5.4 - Observe current drain. Current will be less than 1 milliamp, typically 500-600 microamps. Note: One possible cause of failure is shorted capacitor C11. 5.5 - Leave all connections as they are for the next test.
Inactive current drain 500 600 microamps Button IN Active current drain 175 +/- 25 mA Button OUT Active Current drain 135 +/- 25mA + Milliamps – Valve Probe end
– battery
+ +
Figure 5.2 Current Drain
Test 6 Active Current Drain 6.1 - Depress and hold black center push button to activate MT2. 6.2 - Observe current drain while the black button is depressed. Current can rise up to as much as 350 mA +/- 50 mA , then fall to 175 mA +/- 25 mA.. 6.3 - Release black button. Current will fall to 135 mA +/- 25 mA. 6.4 - If readings are normal, calibrate with Calvin equipment.
4
Preliminary Bench Test for MicroTymp 2 23641 continued: 7 Calvin Calibration for “Needs Cal” 7.1 - Select Main Menu option #2 “Calibration Tools”. ENTER 7.2 - Select Tools Menu option #1 “I2E2 Prom Editor”. ENTER 7.3 - Wait 5 seconds for CALVIN to display PROM REGISTER Observe data in registers 2E and 2F. 2E should read FA 2F should read CE 7.4 - If data varies from above, enter correct data in by moving the cursor to register 2E and typing in FA. Do not press ‘enter’. The cursor will automatically go to position 2F. Then type in CE. Do not press ‘enter’. Note:
The entered data causes those locations to turn yellow.
7.5 - Observe registers AC, AD, AE. They should read 00 (no data) Data may be present if unit had a “NEEDS CAL” message. 7.6 - Erase any data in these registers by moving the cursor to each register and typing in 00. Data will turn yellow. Press ENTER after AC AD and AE data is erased. 7.7 - Unit will Update registers then Tools Menu will be automatically displayed. 7.8 - Remove MT2 handle from Calvin and install fully charged battery. 7.9 - MT2 will display “OPEN” message. (working mode) 7.10 - If a “NEEDS CAL” message re-appears, there is a hard failure. Perform troubleshooting for failed component(s). Two common causes of “NEEDS CAL” error message are: “Pressure Transducer Error” is caused by blocked tube(s). Refer to section 4.5 of NEEDS CAL TROUBLESHOOTING GUIDE, found in MicroTymp2 Service Manual #236409.
“Home Pump Error” can be caused by one or combinations of : bad motor, cold solder joint, bad optical interrupt, or loose pulley. Piston is off pulley. Refer to section 3.5 of NEEDS CAL TROUBLESHOOTING GUIDE, found in MicroTymp2 Service Manual #236409.
END Preliminary Bench Test for MicroTymp 2 23641
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