Kendall
Vascular Compression Systems DVT
A-V Impulse 6060 Series Controller and Accessories Service Manual Rev April 2011
Service Manual
138 Pages
Preview
Page 1
TABLE OF CONTENTS 1.0 LIMITED WARRANTY AND FACTORY SERVICE... EN-1 2.0 MAINTENANCE... EN-3 2.1 INTRODUCTION... EN-3 2.2 CONTROLLER FUNCTIONALITY TESTS ... EN-3 2.3 COMPUTER BASED TEST METHOD... EN-4 2.4 REGULAR MAINTENANCE... EN-4 2.5 PREVENTATIVE MAINTENANCE... EN-4 2.5.1 Labeling... EN-5 2.5.2 Power Cord... EN-5 2.5.3 Cooling Fan... EN-5 2.5.4 Membrane Switch Panel and Display... EN-5 2.5.5 Air Tubing Sockets... EN-5 2.5.6 Compressor Service Interval... EN-6 Compressor Performance... EN-6 Controller test method... EN-6 PC test method . ... EN-6 Manual test method... EN-6 Compressor Overhaul... EN-6 6000-hour service... EN-6 Air filter replacement... EN-6 Compressor disassembly... EN-7 Compressor re-assembly... EN-7 12000-hour service... EN-7 Compressor removal... EN-7 Air filter replacement... EN-8 Compressor re-assembly... EN-8 Electrical safety test... EN-9 Compressor enclosure isolation ... EN-9 Compressor re-installation... EN-9 Recommended Service Schedule... EN-11 Key to Recommended Service Schedule... EN-11 2.5.7 Alarms... EN-12 2.5.8 Functionality and safety tests... EN-12 3.0 FAULT DIAGNOSIS...EN-12 3.1 POWER SUPPLY...EN-13 3.2 LIQUID CRYSTAL DISPLAY...EN-13 3.3 COMPRESSOR...EN-13 3.4 IMPULSE CONTROL VALVES...EN-14 3.5 ERROR CODES...EN-14 4.0 COMPONENT REPLACEMENT PROCEDURES...EN-15 4.1 OPENING AND CLOSING THE CONTROLLER CASE...EN-15 4.2 REPLACING AN AIR TUBING SOCKET ‘O’ RING SEAL...EN-16 4.3 REPLACING AN AIR TUBING SOCKET BODY...EN-17 A-V Impulse System
TABLE OF CONTENTS 4.4 REPLACING THE MEMBRANE FASCIA LABEL...EN-17 4.5 REPLACING THE MEMBRANE SWITCH PANEL...EN-17 4.6 REPLACING THE COMPRESSOR...EN-18 4.7 REPLACING THE RESERVOIR...EN-18 Remove the old reservoir... EN-18 Dismantle the old reservoir... EN-19 Remove the fill and vent valves from the old reservoir... EN-19 Replace the fill and vent valves onto the new reservoir... EN-19 Rebuild the new reservoir... EN-19 Install the new reservoir into the case... EN-19 4.8 REPLACING A FILL OR VENT VALVE PISTON...EN-20 4.9 REPLACING A VALVE COIL...EN-21 4.10 REPLACING THE FAN ASSEMBLY...EN-21 4.11 REPLACING THE VALVE DRIVER PCB ASSEMBLY...EN-23 4.12 REPLACING THE PROCESSOR PCB ASSEMBLY...EN-23 4.13 REPLACING DISPLAY COMPONENTS...EN-23 4.14 REPLACING THE EPROM...EN-25 4.15 REPLACING THE POWER SUPPLY ASSEMBLY...EN-25 4.16 REPLACING THE POWER CORD...EN-26 4.17 REPLACING THE POWER INLET...EN-26 4.18 REPLACING A FUSEHOLDER...EN-27 4.19 REPLACING THE POWER SWITCH...EN-28 5.0 UPGRADE ITEMS...EN-29 6.0 LIST OF SUPPORTING ITEMS...EN-29
A-V Impulse System
1.0 LIMITED WARRANTY AND FACTORY SERVICE Covidien warrants that your A-V Impulse Foot Compression System controller does not contain defective material or workmanship. This warranty is for one year from the delivery of the controller to the original purchaser. If within the first year there is a fault on the unit, the controller should be returned to the Covidien Service Department at the address shown below, and Covidien will free of charge, inspect the unit and replace any part which upon their examination, appears to be defective provided that there is no evidence that the unit has been tampered with, or mistreated. This warranty does not apply to the tubing assemblies or the disposable Impad inflation pads or equipment damaged through shipping, tampering, negligence, or misuse, including liquid immersion, autoclaving, or ETO sterilization. If, within the first year of purchase the controller is serviced by personnel other than those expressly authorized by Covidien, the warranty becomes void, and the company cannot be held liable for any consequential damage caused as a result. Some countries do not allow the exclusion or limitation of accidental or consequential damages, so the foregoing limitation or exclusion regarding damages may not apply. Also, this Limited Warranty gives you specific legal rights, and you may also have other rights, which vary, from country to country. The Service Manual is intended as a guide to technically qualified personnel when evaluating instrument malfunctions, it is not to be construed as authorization to perform warranty repairs. Unauthorized service will void the warranty. If you have any service maintenance problems, contact Customer Services at Covidien. If possible, the original packaging should be used to ensure safe arrival. Before shipping your unit please call the number below to obtain a return material authorization number. Covidien maintains a service facility with the capability to promptly repair an A-V Impulse Foot Compression System controller. Controllers requiring repair must be shipped fully assembled, prepaid and insured to:
CANADA Covidien Canada 7500 Trans Canada Highway Pointe-Claire, Qc H9R 5H8 877-644-8926
UNITED Covidien STATES 5920 Longbow Drive Boulder, CO 80301 1- (800) 255-8522
AUSTRALIA Australian Service Centre 52A Huntingwood Drive (Corner Liberty Road) Huntingwood NSW 2148 Toll Free: 1800 350 702 Tel: (02) 9678 2256 Fax: (02) 9671 8118
EN-1
A-V Impulse System
Liquid crystal display Bed hook/handle
Membrane Switch Panel
Membrane Fascia Label
Case front Power Switch Figure 1: View of the front of the controller Patient Left Air Tubing Socket
Communication Port
Patient Right Air Tubing Socket
Case Screws Instruction Label
Power Cord Retainer
Bumper
Ground Test Screw
Fuse Holders
Tamper Label
Figure 2: View of the back of the controller and the bed hook/handle
A-V Impulse System
EN-2
2.0 MAINTENANCE 2.1 INTRODUCTION Personnel servicing this equipment should be familiar with the Operator’s Instruction Manual and the operating principals of the A-V Impulse System Controller. The alarm indicators displayed by the controller are useful in diagnosing problems. If a controller needs to be returned to Covidien for service, it should be accompanied by a description of the problem and any fault or error codes that are displayed along with a return materials authorization number. This manual conforms with the Covidien policy of restricting service procedures to board level. In accordance with this policy circuit diagrams, repair and test information are not available for service personnel to attempt component level repair. Covidien maintains a stock of replacement boards if one is needed. The descriptions used are identical or abridged versions of items listed in Section 6. THE CONTROLLER SHOULD ALWAYS BE DISCONNECTED FROM MAINS VOLTAGE BEFORE ATTEMPTING ANY MAINTENANCE OR SERVICING PROCEDURE.
2.2 CONTROLLER FUNCTIONALITY TESTS The functionality tests specified are the same as that used to verify correct operation of the controller prior to product release. Throughout this document reference is made to part or all of these tests to provide an effective means of verifying controller function. 2.2.1 Ensure that the controller is not connected to mains voltage. Release each fuseholder and confirm that the fuses are T1AH, 250 V. Replace the fuses and confirm that the fuse holder locks correctly. 2.2.2 Switch ON the controller and check that the start up routine and displays are clearly shown as described in the Operator’s Instruction Manual. 2.2.3 Check that all of the backlight LEDs are illuminated. 2.2.4 Check that the compressor and fan are running. 2.2.5 Press the patient right and patient left buttons, and check that the pressure and impulse duration for each preset are correct. 2.2.6 Press the and the buttons until the air tubing and foot icons appear. The buttons should not need to be pressed more than twice. 2.2.7 Press the patient left and patient right and buttons twice each and check that the displayed pressure value changes. 2.2.8 Press the button once. The cycle icon and cycle value should be displayed for five seconds. 2.2.9 Connect the Standard test load (1 liter) to the patient left and patient right channels. Check the pressure displayed is 130 mmHg and the hold time is 3 seconds. Press the and the buttons. Confirm that the tick marks appear within 4 impulses on each channel. 2.2.10 With the cycle time set to 20 seconds, use a stopwatch to measure the time between impulses. The interval should be 20 seconds +/- 1 second. 2.2.11 Use an Electrical Safety Analyzer to check that the resistance of the power cord is less than 0.2 ohms. The analyzer test lead must be connected to the earth screw on the power cord retainer. 2.2.12 With the power switch in the ON position, use an Electrical Safety Analyzer to check that the leakage current is less than 0.1 mA. The analyzer test lead must be connected to the earth screw on the power cord retainer.
EN-3
A-V Impulse System
2.3 COMPUTER BASED TEST METHOD The Functional Test Kit contains the extensive FrontLite™* PC based test program, a controller to computer interface cable and two Standard test loads (1 liter) and is suitable for inspection and preventative maintenance purposes. This program is used to verify compressor output and impulse pressure using the Standard test load (1 liter) and controller cycle and inflation times through the controller communication port using the controller to computer interface cable. The controller can also be connected to a modem for remote interrogation through the communication port using the controller to modem interface cable.
2.4 REGULAR MAINTENANCE The only regular maintenance necessary is to clean the outer case of the controller when required, and to check the air supply tubing and connectors for damage. Remove external fluff/dust from the fan inlet and outlet grills by gently vacuuming them and then remove fluff/dust from the fan blades by blowing them with low-pressure air, without over-speeding the fan. POSITION THE CONTROLLER TO REDUCE LINT ENTRY AND DO NOT COVER WITH BEDDING. The controller case should be cleaned with a soft cloth dampened with water. If necessary the unit can be wiped with a mild disinfectant and/or detergent, but excess fluid should be avoided. The controller should be wiped dry with a clean cloth. Warning: Disinfectants that are known to be corrosive to metals must not be used. Use of Iodine can cause controller surface discoloration. The controller enclosure can be cleaned with a soft cloth dampened with water or a mild detergent. To sanitize the device, apply cleaning agents with a cloth or wipe. Avoid excessive spraying, especially in the areas of the fan grills and connection ports on the back of the device. If any liquid enters the grill or ports, then internal component damage will likely result. The controller should be wiped with a clean, dry cloth afterward. Do not immerse in any liquid. Do not use cleaning products containing ammonium chloride, acetone or other aromatic solvents, as those chemicals will degrade the integrity of the case and cause it to become embrittled and possibly crack. The A-V Impulse Foot Compression System cannot be effectively sterilized by liquid immersion, autoclaving, or ETO sterilization, as irreparable damage to the system will occur. The table below provides recommended detergent information and their chemical components. RECOMMENDED CLEANERS
Chemical component (with approximate concentrations)
Commercial Example
Dodecylbenzene Sulfonate, Coconut Diethanolamide diluted per instructions
Manu-klenz™*
0.5% bleach solution
Dispatch™*
Generic equivalent
Response™*
2.5 PREVENTATIVE MAINTENANCE To maintain optimum functional performance and electrical safety it is recommended that after one year’s operation, and then every year, the controller be removed from use and checked.
A-V Impulse System
EN-4
Carry out all of the procedures contained in Sections 2.5.1 through 2.5.8 inclusive, referring to the recommended service schedule throughout. When a controller is opened for service or repair, remove accumulated dust from inside the case halves, especially around the fan blades and fan housing area. 2.5.1 Labeling Examine the labels on the controller and ensure they are legible and intact. If any of the information on a label cannot easily be read, the label should be replaced. 2.5.2 Power Cord Examine the power cord assembly and replace the power cord if there are any signs of damage (see Section 4.16). As a quick check use a digital earth tester, and check that the resistance between the earth pin on the power cord, and the power cord retainer screw is 0.2 ohms or less. If this value is greater than 0.2 ohms, remove the power cord and test the power cord separately. If the resistance of the power cord is greater than 0.1 ohms, then it should be replaced. If the resistance of the power cord is less than 0.1 ohms, measure the resistance between the earth pin of the controller power inlet, and the earth test screw. If the value of this resistance is greater than 0.1 ohms, the controller should be returned to the Covidien Service Department for repair. Connect the controller, via the power cord, to an Electrical Safety Analyzer and confirm the earth resistance and leakage current (see Sections 2.2.11 and 2.2.12). If the test values exceed these limits the controller should be returned to Covidien for repair. Ensure that the power cord retainer screw is securely fastened for this test. 2.5.3 Cooling Fan Check that the cooling fan is running smoothly and there is no vibration or other noise that might indicate the fan is damaged or obstructed. If the cooling fan is not operating at normal speed and efficiency, open the case to inspect it more closely. Beware of metal parts at higher than mains voltage. For greater access to the fan, the power supply assembly should be removed (see Section 4.15). Use a vacuum cleaner or low pressure air to remove dust or debris from the cooling fan and grill. Refit the power supply. 2.5.4 Membrane Switch Panel and Display Switch ON the controller and check the Liquid Crystal Display (LCD) for sharpness, legibility and brightness. If the display appears dim or segments are missing, dismantle the display assembly and clean the contacts to the LCD (see Section 4.13). Use the following tests to check that the buttons on the membrane switch panel are working effectively. If a button has to be pressed hard or more than once in order to get a response, then replace the switch panel (see Section 4.5). Press the and the buttons and check that the air tubing and foot icons appear. Ensure the controller delivers an impulse to each channel. Stop the impulsing by pressing both the buttons. Use the button to select each setup in turn, and check that the information displayed matches the description in the Operator’s Instruction Manual. Use the and buttons to alter the impulse pressure. Press the button, then use the and buttons to alter the cycle time. 2.5.5 Air Tubing Sockets Replace the ‘O’ ring seals within the air tubing sockets (see Section 4.2). Examine the socket face for damage such as chips and cracks. If there is any visible damage replace the socket (see Section 4.3).
EN-5
A-V Impulse System
2.5.6 Compressor Service Interval The compressors should be tested every 3000 hours and maintained at 6000 hour intervals. The service requirement at alternate 6000 hour intervals requires more intervention and additional parts. Compressor service kits are available containing all necessary parts to service the compressor at both 6000 hour and 12000 hour service intervals. Compressor Performance controller test method This is a convenient method of testing compressor performance at any interval and indicates the controller’s ability to attain an acceptable system pressure. For controllers with all version 16 software the compressor output pressure can be tested directly on the controller using a Standard test load (1 liter) connected to the patient right channel. Turn the controller power switch ON and during the 5 second countdown press the patient right button twice in quick succession to start the test. A 60-second countdown is displayed in the top left of the LCD and a flashing “P” in the top right. When the countdown is complete the controller will impulse once from the patient right channel into the test load. The compressor output pressure is displayed in the top right of the LCD for 20 seconds, or until any button is pressed, after which the controller will revert to normal operation. If the compressor output pressure is less than 16 psi then the compressor should be serviced or replaced with a new item. Alternatively the complete controller can be returned to Covidien for repair. PC test method This is a convenient method of testing compressor and controller functional performance at the 3000 or 6000 hour interval which indicates the controller’s ability to attain an acceptable system pressure and allows a record to be retained. The performance may be tested by using the FrontLite™* test program and a PC connected to the controller communication port using the supplied cable and Standard test load (1 liter), following the supplied instructions. Manual test method This is a direct method of testing compressor performance whenever the controller case is open and indicates compressor dead head pressure only. To manually test the compressor output pressure open the controller case front approximately one inch and carefully remove the 7 way flat flexible cable from the processor PCB assembly. Position the controller onto its handle, on a flat surface. Disconnect the compressor supply tube at the reservoir nipple and connect it to a pressure meter. Reinstate the controller to the upright position. Turn the controller power switch ON and read the pressure output. Compressor Overhaul Reference should be made to the Recommended Service Schedule table for guidance into compressor component replacement intervals. The following procedures are sequentially structured. ENSURE THAT THE CONTROLLER IS NOT CONNECTED TO MAINS VOLTAGE. 6000-hour service This service is carried out without removing the compressor from the controller. All replacement parts are included in the Compressor Service kit 6000 hour (AV6752-01). Air filter replacement Undo the central M4x5 pan head filter cover screw and remove the filter cover. Remove the air filter, baffle (if fitted) and ‘O’ ring and discard all of these parts. Remove dust from the air filter recess with compressed air and wipe clean. Fit the new air filter into the filter housing. Insert the baffle inside the air filter with the space in the baffle wall adjacent to the compressor feet.
A-V Impulse System
EN-6
Replace the filter cover ‘O’ ring and re-assemble the filter cover (a very small smear of petroleum jelly can be applied to the ‘O’ ring to help retain it in the filter cover ‘O’ ring groove). Rotate the filter cover so the inlet hole is adjacent to the top of the compressor and refit the screw. When the filter cover is in place apply a 1Nm / 0.74 lbf-ft torque to the filter cover screw. Compressor disassembly Without putting stress on the rubber mounting feet, unscrew the four M4x10 cap head screws securing the filter housing using an M4 driver. Carefully pull the filter housing and cylinder head gasket away from the compressor body and discard the gasket. Compress the piston assembly by inserting a finger into the bore and pull to remove the cylinder liner assembly and cylinder liner gasket and discard the gasket. Remove the M3x6 screw holding the exhaust valve assembly in place on the cylinder liner and discard all of the exhaust valve components. Use an Isopropyl Alcohol (IPA) wipe to carefully clean the cylinder liner and inspect for possible wear on the plated liner bore. Assemble and align the replacement exhaust reed spring, exhaust reed seal, reed spacer and plain washer onto the cylinder liner, ensuring that the spring and reed valve are flat and placed centrally over the exhaust hole and secure with the M3 screw. When all exhaust valve assembly components are correctly aligned apply a 1Nm / 0.74 lbf-ft torque to the M3 screw. Confirm correct alignment of the exhaust valve assembly components and ensure that the exhaust reed seal is in contact with the valve seat face of the cylinder liner. Remove the piston assembly and spring from the compressor. Rotate the piston clockwise and pull to ensure the removal of the spring. A hook tool (or similar) may be used if the spring is still attached to the fixed guide bush end. Care must be taken not to damage the guide bush plated bore. Inspect the compressor for wear damage; - the removed piston assembly for heavy abrasive wear - for damage to the bore of the guide bush - for debris or contamination that is not the sacrificial wear (white dust) on the piston assembly and liners - the compressor internally for signs of the coils overheating If any of the above is found which cannot be rectified by the following procedure or additionally reworked according to the 12000 hour procedure, the compressor must be replaced or the controller sent to an approved service center for repair. If there are no defects, internally clean the compressor with compressed air. Compressor re-assembly Assemble the replacement spring into the new piston assembly by compressing and twisting the spring anti-clockwise. Lightly pull the spring to check that it is secure and check that it is located axially. Fit the new piston assembly and spring into the compressor by compressing and slightly twisting clockwise to secure to the guide bush end spigot. Lightly pull the piston to check the spring is located and secure. Fit the new cylinder liner gasket onto the cylinder liner assembly. Place the liner carefully over the piston assembly and into the cylinder liner bore with the exhaust valve assembly orientated opposite the outlet port. Fit the new cylinder head gasket ensuring that the gasket holes are aligned with the four cap head screw holes. Check that the piston head is not raised above the cylinder head gasket and should move freely in and out with a light finger push. Fit the filter housing assembly taking care not to dislodge the cylinder head gasket and evenly tighten the M4x10 cap head screws to 4Nm (2.95 lbf-ft). ENSURE THAT THE CONTROLLER IS NOT CONNECTED TO MAINS VOLTAGE.
EN-7
A-V Impulse System
12000-hour service This service is carried out with the compressor removed from the controller so that access is available to both ends of the compressor. All replacement parts are included in the Compressor Service kit 12000 hour (AV6753-01). The use of a compressor alignment tool is a mandatory requirement to ensure correct axial alignment of the piston assembly. Compressor removal If the compressor service is being actioned at the same time as the reservoir service it is beneficial to remove the reservoir first to allow better access to the compressor. Detach the compressor electrical wiring connector from the power supply and remove the air tubing at the outlet port. Remove the moisture drain, air tubing and dc wiring loom attached to the compressor chassis. Remove the four M3 screws and washers securing the compressor chassis to the rear case and two M3 screws and washers securing the compressor chassis to the processor chassis. Carefully pull the compressor chassis upwards to completely remove from the rear case assembly. Remove the four M4 screws and washers, securing the rubber mounts to the chassis and remove the compressor. Air filter replacement Undo the central M4x5 pan head filter cover screw and remove the filter cover. Remove the air filter, baffle (if fitted) and ‘O’ ring and discard all of these parts. Remove dust from the air filter recess with compressed air and wipe clean. Fit the new air filter into the filter housing. Insert the baffle inside the air filter with the space in the baffle wall adjacent to the compressor feet. Replace the filter cover ‘O’ ring and re-assemble the filter cover (a very small smear of petroleum jelly can be applied to the ‘O’ ring to help retain it in the filter cover ‘O’ ring groove). Rotate the filter cover so the inlet hole is adjacent to the top of the compressor and refit the screw. When the filter cover is in place apply a 1Nm / 0.74 lbf-ft torque to the filter cover screw. Compressor disassembly Unscrew the four M4x10 cap head screws securing the filter housing using an M4 driver. Carefully pull the filter housing and cylinder head gasket away from the compressor body and discard the gasket. Compress the piston assembly by inserting a finger into the bore and pull to remove the cylinder liner assembly and cylinder liner gasket and discard both items. Remove the piston assembly and spring from the compressor and discard both items. Rotate the piston clockwise and pull to ensure the removal of the spring. A hook tool (or similar) may be used if the spring is still attached to the fixed guide bush end. Remove the two M4x40 cap head screws from the rear cover end and remove the rear cover. Once these screws are loosened re-alignment of the compressor is mandatory using the special compressor alignment tool. Remove the guide bush with the guide bush end from the cylinder housing legs and discard both bush components. Ease out the coil assembly with the cable assembly attached, from the cylinder housing. Inspect the compressor for wear damage; - for debris or contamination that is not the sacrificial wear (white dust) on the piston assembly and liners - the compressor internally for signs of the coils overheating If either of the above is found which cannot be rectified by the following procedure, the compressor must be replaced or controller sent to an approved service center for repair. If there are no defects, internally clean the compressor with compressed air.
A-V Impulse System
EN-8
Compressor re-assembly Stand the compressor alignment tool upright on a flat surface, with the small diameter upwards. Place the cylinder housing onto the alignment tool with the guide bush end uppermost, ensuring that it locates correctly in the cylinder liner bore. Carefully fit the coil assembly over the alignment tool and into the cylinder housing, ensuring that the cable assembly and cable grommet are facing upwards and in the direction of the rubber mounts. With the alignment tool still in place and ensuring the cable assembly is clear, ease the guide bush over the small diameter of the alignment tool and into the cylinder housing legs until the bottom of the guide is located down onto the step. Fit the new guide bush end into the guide bush ensuring it is fully inserted and flush. During this assembly ensure that the ‘crush’ cones are not flattened. With the alignment tool still in place, fit the rear cover over the coil assembly, ensuring the cable grommet is correctly positioned and not pinched. Align the two M4x40 cap head screws through the rear cover and coil assembly laminations and screw into the cylinder housing. When all components are correctly aligned tighten the screws evenly to 6.4Nm / 4.72 lbf-ft torque. Remove the alignment tool. Check internally for debris and blow out with compressed air. Assemble the replacement spring into the new piston assembly by compressing and twisting the spring anti-clockwise. Lightly pull the spring to check that it is secure and check that it is located axially. Fit the new piston assembly and spring into the compressor by compressing and slightly twisting clockwise to secure to the guide bush end spigot. Lightly pull the piston to check the spring is located and secure. Fit the new cylinder liner gasket onto the cylinder liner assembly. Place the liner carefully over the piston assembly and into the cylinder liner bore with the exhaust valve assembly orientated opposite the outlet port. Fit the new cylinder head gasket ensuring that the gasket holes are aligned with the four cap head screw holes. Check that the piston head is not raised above the cylinder head gasket and can be moved freely in and out with a light finger push. Fit the filter housing assembly taking care not to dislodge the cylinder head gasket and evenly tighten the M4x10 cap head screws to 4Nm (2.95 lbf-ft). Electrical safety test compressor enclosure isolation Apply a test voltage of 2500V R.M.S. at 50 or 60Hz (substantially sinusoidal waveform) shall be applied in turn between each compressor power lead and the metal compressor enclosure for 1 second. No breakdown shall occur. The test circuit used shall incorporate a current sensing device which trips giving an audible or visual indication when the current exceeds 5mA. Compressor re-installation If the compressor service is being actioned at the same time as the reservoir service it is beneficial to replace the compressor before refitting the reservoir. Refit the compressor to the compressor chassis using the four M4 screws and washers to secure the rubber mounts. Ensure that the rubber mounts are located into the chassis holes correctly and are aligned straight across the chassis once the screws have been tightened. Route the electrical wiring through the side grommet hole. Carefully locate and lower the compressor chassis downwards into the rear case assembly. Refit the four M3 screws and washers securing the compressor chassis to the rear case and two M3 screws and washers securing the compressor chassis to the processor chassis. Connect the compressor electrical wiring connector to the power supply and the air tubing to the outlet port. Refit the moisture drain, air tubing and dc wiring loom attached to their respective clips on the outside of the compressor chassis. Close case. Connect the controller to mains voltage. Test the compressor according to any method detailed in compressor performance at the start of this sub-section.
EN-9
A-V Impulse System
Figure 3: Compressor user serviceable parts
Exhaust Valve Assembly
Spring
r
ton
Pis
Air Filter
e Lin er lind ly Cy semb As
Sealing Ring Sealing Ring
Filter Cover
Cylinder Liner Gasket Cylinder Liner
Reed Spacer Exhaust Reed Seal Exhaust Reed Spring Plain Washer M3x6 Pan Pozi Screw
Filter Housing
Baffle 'O' Ring
Filter Cover Pan Head M4x5 Screw
e Ass
ly mb
Cylinder Housing
Outlet Port
Guide Bush End Guide Bush Coil Assembly
Cylinder Head Gasket M4x10 Cap Head Screws
M4x40 Cap Head Screws
ber
Cable Grommet
am Ch ton bly Pis sem As
Cable Assembly
Rear Cover
Manufacturer's Voltage Label
Rubber Mounts
EN-10
A-V Impulse System
Recommended Service Schedule PART NUMBER
DESCRIPTION COMPRESSOR
AV6534-00 AV6752-01 AV6753-01
3000
Air filter element 6000 Hr Kit 12000 Hr Kit
SERVICE INTERVAL HOURS 5-6000 8-9000 11-12000
N N N
M M N
N N N
M M M
L A A M N N N
L A A M N N N
L A A M N N D
L A A M M N N
GENERAL PARTS AV6555-00 AV6540-01 AV6541-02 AV6598-01 AV6547-00 AV6564-16 AV6517-03
O-ring seal Case foot set Case & handle grip set Temper seal grey Reservoir assembly EPROM (USA) Fan
AIR TUBING 5007
Air tubing assembly (blue)
D
D
D
D
Key to Recommended Service Schedule M
Mandatory Replacement
D
Replace on discretionary basis
L
Lubricate with ‘O’ ring lubricant AV6545-00
A
Replace using Loctite 401 after cleaning off all residual adhesive from moulding.
N No action
EN-11
A-V Impulse System
2.5.7 Alarms Kinked air supply tubing Connect the Standard test load (1 liter) to the patient right air output socket. Switch ON the controller and press the button, wait for the tick mark to appear. Kink the air supply tubing to the test load. At the next impulse the controller will detect that the air tubing is kinked, the air should be dumped immediately through the vent valve and the tick mark will disappear. After another three impulses the display should show the icon for a kinked air tubing and a flashing fault code of 2, the audible alarm should sound and the controller should continue with short impulses. If the air is not dumped through the vent valve after the next cycle, then unkink the air tubing and replace the valve driver PCB assembly (see Section 4.11). After the audible alarm sounds, unkink the air tubing. At the next impulse the controller should detect that the kink has been removed, the audible alarm should stop and the icon for the kinked air tubing should no longer be displayed. Allow the controller to continue impulsing until the tick mark is displayed. Repeat this test procedure for the patient left channel. Detached air supply tubing Connect the Standard test load (1 liter) to the patient left air output socket. Do not connect the patient right air output socket. Switch ON the controller, press the and buttons. After the first impulse to the patient right channel the controller should detect that the patient right air tubing is detached. The display should show an arrow between the icon for the controller and the icon for the patient right air tubing, and display a flashing fault code of 1. The audible alarm should sound, and the controller should continue to impulse to both channels. Without stopping the impulses, disconnect the test load from the patient left air output socket and connect it to the patient right air output socket. Do not connect the patient left air output socket. At the next impulse to the patient right channel, the controller should detect that an air tubing has been connected, and the fault code for the patient right channel will no longer be displayed. After four impulses to the patient left air output socket, the display for this channel should show the icons for a detached air supply tubing. If the controller does not alarm correctly the controller should be returned to the Covidien Service Department. 2.5.8 Functionality and safety tests Close the case. Perform the controller safety tests to confirm the earth resistance and leakage current (see Sections 2.2.11 and 2.2.12). Perform the complete controller functionality tests (see Section 2.2 or 2.3).
3.0 FAULT DIAGNOSIS THE CONTROLLER SHOULD ALWAYS BE DISCONNECTED FROM MAINS VOLTAGE BEFORE ATTEMPTING ANY MAINTENANCE OR SERVICING PROCEDURE. Before undertaking any fault diagnosis, check the fuses. If, when the controller is switched ON, a replacement fuse blows immediately, the controller should be returned to the Covidien Service Department for repair. The diagnostic procedures specified assume that the controller is connected to mains voltage and switched ON. When diagnosing any fault, check the power supply output voltages first.
A-V Impulse System
EN-12
3.1 POWER SUPPLY WHEN CHECKING THE POWER SUPPLY VOLTAGES, BEWARE OF EXPOSED METAL PARTS AT HIGHER THAN MAINS VOLTAGE. See the table below for the power supply assembly test points.
CONNECTOR/PIN (-)
CONNECTOR/PIN (+)
VOLTAGE (±5%)
PL3/1
PL3/2
+5V DC
PL3/1
PL3/3
+24V DC
PL4/1
PL4/2
+5V DC
PL4/1
PL4/3
+24V DC
PL5/1
PL5/3
<10V DC
PL5/1
PL5/3
See notes 1 & 2
NOTE: 1. Link PL4/4 to PL4/2 Via a 1K resistor. Disconnect the connector from the valve driver PCB assembly at PL3, and insert the legs of the resistor into the socket. 2. This voltage should be the local mains supply voltage. Use standard antistatic precautions when handling the electronic PCB’s.
3.2 LIQUID CRYSTAL DISPLAY (Including the LED backlighting and Liquid Crystal Display) If the Liquid Crystal Display (LCD) is not backlit or only partially lit check the power supply output voltages. Confirm the power supply voltages conform to the table (see Section 3.1). If the voltages are correct then replace the processor PCB assembly. If the voltages are not correct then replace the power supply assembly. If the LCD elements are incomplete dismantle the display and clean the zebra elastomer and contact surfaces (see Section 4.13). If the LCD is entirely blank check the power supply output voltages. Confirm the power supply voltages conform to the table (see Section 3.1). If the voltages are correct then check the fit of the EPROM into the socket. If this does not correct the fault, then replace the processor PCB assembly. If the voltages are not correct then replace the power supply assembly. Alternatively the whole controller may be returned to the Covidien Service Department for repair.
3.3 COMPRESSOR If the compressor is not operating check that the controller is not in the standby condition by pressing either the or the buttons. Confirm the power supply for the compressor is at mains voltage. If the mains voltage is not correct then replace the power supply assembly. If the mains voltage is correct then remove the compressor and replace with a new compressor. Also compressor service kits are available. Alternatively the whole controller may be returned to the Covidien service department for repair.
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3.4 IMPULSE CONTROL VALVES If the controller is not impulsing air from either air tubing socket, press both and buttons, check that the LCD shows that the controller is impulsing and listen for air issuing from the patient air output sockets. If air is not heard check the compressor performance (see Section 2.5.6). Additionally the valve function can be checked by switching the controller OFF and ON, and listening for the sequence of multiple clicks as the valves are cycled during the start up routine. If the clicks are not heard, check that the electrical connections to the valve driver PCB assembly and from the valve driver PCB to the valve coils are secure. If the valves still do not operate, disassemble the valves and clean them (see Section 4.8). Alternatively the whole controller may be returned to the Covidien service center for repair.
3.5 ERROR CODES See the table below for controller error codes. CODE
DESCRIPTION
CAUSE
REMEDY
E01
RAM error
Failure on processor PCB assembly
Replace the processor PCB assembly
E02
ADC error
ADC output is not zero at switch ON
Check that there is no pressure on the transducer at switch ON Replace the valve driver PCB assembly
E03
NVR error
Failure on processor PCB assembly
Replace the processor PCB assembly
E04
Membrane switch panel error
Buttons depressed at Do not depress buttons switch ON at switch ON Defective membrane Replace defective switch panel membrane switch panel
E05
Left fill
Left fill valve not closing properly
Dismantle and clean valve components Replace the fill valve piston
E06
Left vent
Left vent valve not closing properly
Dismantle and clean valve components Replace the vent valve piston
E07
Right fill
Right fill valve not closing properly
Dismantle and clean valve components Replace the fill valve piston
E08
Right vent
Right vent valve not closing properly
Dismantle and clean valve components Replace the vent valve piston
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CODE
DESCRIPTION
CAUSE
REMEDY
E09
Hardware version
The software and hardware versions are not compatible
Check with the Covidien Service Department
E10
High pressure trip
The high pressure trip line is not zero
Check that there is no pressure on the transducer at switch ON Replace the valve driver PCB assembly
E11
NVR setup
A new software version has failed to update Non-Volatile RAM
Switch OFF and ON
E12
Over Temperature Cutout
Over Temperature Cutout exceeded 113°F (45°C)
Check the fan grills are not obstructed Check the fan is operating at normal speed and efficiency Replace the fan
4.0 COMPONENT REPLACEMENT PROCEDURES THE CONTROLLER SHOULD ALWAYS BE DISCONNECTED FROM MAINS VOLTAGE BEFORE OPENING THE CASE. Before replacing any component, read the procedure completely. If you have any doubts about how to replace a component, contact the Covidien service department. Incorrect servicing could lead to components being damaged. If, after replacing a component, there are still problems that you cannot correct, contact the Covidien service department. When you have replaced the part, and closed the case, you should always check that the fault has been corrected, and that the controller is operating properly by performing the complete controller functionality tests (see Section 2.2 or 2.3).
4.1 OPENING AND CLOSING THE CONTROLLER CASE Opening up the case Place the controller handle-side up on a flat surface, which will not scratch or otherwise mark the case. Use a 3mm hexagon key to unscrew the four case retaining screws located at each corner. Turn the unit front-side up resting on the handle. DO NOT try to separate the parts of the case at this stage. Ensure that the wires connecting the power switch to the controller electronics, and the 7 way flat flexible cable connecting the membrane switch panel to the processor PCB assembly, are not strained. With the membrane switch panel facing you, very gently lift the top cover until the edge of the case front rests on the top edge of the bezel that surrounds the LCD. To the right side of the display you will see a flexible cable going into a small connector. Use a fingernail to gently open the latch on the connector. With your fingers pull the cable out of the connector. The case front can now be separated.
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DO NOT allow the flexible cable to become creased or the cable will be damaged, and the membrane switch panel will have to be replaced. The wires connecting the power switch to the electronics are long enough to allow the two halves of the case to be laid beside each other. Closing the case With the display facing you, locate the bottom lip of the case front into the back of the case rear moulding of the controller. Hold the membrane switch panel 7 way flat flexible cable, and carefully lower the case front moulding onto the case rear, making sure that the flexible cable comes over the front of the processor PCB. Avoid touching the contact end of the cable. DO NOT pull the flexible cable into a tight curve. When the base of the case front is resting on the top edge of the LCD bezel, check that the latch on the connector for the control panel flexible cable is open. Hold the cable between the thumb and forefinger and carefully guide the cable into the connector, and then close the latch. Carefully close the case making sure there are no wires or tubes trapped, which will prevent the case from being closed properly. Turn the controller over, and secure it with the four 3mm hexagon screws. Perform the complete controller functionality tests (see Section 2.2 or 2.3). Fit a new tamper label over the case retaining screw (see Figure 2) Processor PCB assembly
Valve driver PCB assembly
Compressor
Power Supply Assembly Power Switch
Figure 4: View of opened case
4.2 REPLACING AN AIR TUBING SOCKET ‘O’ RING SEAL This is done without opening the case. Use a coin to unscrew the socket face. Remove the old ‘O’ ring seal. Lubricate the new ‘O’ ring by lightly covering the tip of your forefinger with ‘O’ ring lubricant and rolling the ‘O’ ring between this finger and your thumb. The most reliable way to insert a new ‘O’ ring is to put the ‘O’ ring onto the plastic unit end connector. Put the connector and ‘O’ ring into the socket body, and turn the socket face into the socket body. This will guarantee the ‘O’ ring is seated correctly. When the ‘O’ ring is seated correctly, tighten the socket face with the coin. Perform the limited controller functionality test (see Section 2.2.9 or 2.3).
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4.3 REPLACING AN AIR TUBING SOCKET BODY Pull the tube off the socket body. Use a screwdriver with a narrow (approximately, 3mm) flat blade to gently pry apart the gap in the case moulding which holds the socket in place, until it comes out. Insert the new socket body in the correct orientation. The socket will only latch into place when the key with the catch on it is slid into the slot in the socket body. Fit an ‘O’ ring seal and secure with the socket face (see Section 4.2). Close the case. Perform the complete controller functionality tests (see Section 2.2 or 2.3).
4.4 REPLACING THE MEMBRANE FASCIA LABEL The membrane fascia label (ROW) is adhesivly mounted onto the case. Gently lift up one corner of the label and peel it off. Remove all adhesive residue from the membrane switch panel. Remove completely the backing paper on the new fascia label. Align the fascia label accurately with the case recess and smooth the label down, starting from the LCD window and always working away from it, ensuring that there are no air bubbles. Perform the controller functionality tests as described in Sections 2.2.5 through 2.2.8 inclusive.
4.5 REPLACING THE MEMBRANE SWITCH PANEL (Including the LCD window and membrane fascia label) Remove the membrane fascia label (ROW) (see Section 4.4). Use standard antistatic precautions when handling the processor PCB assembly. With the membrane switch panel facing you, use a fingernail to gently open the latch on the membrane switch panel connector on the processor PCB assembly. With your fingers pull the 7 way flat flexible cable out of the connector. The case front can now be separated. The membrane switch panel is adhesivly mounted onto the case front. Gently lift up one corner of the label and peel it off. Remove all adhesive residue from the case. If the LCD window is not serviceable (i.e., scratched, chipped, or cracked), remove it. Place the LCD window in the recess in the case front and secure it with a strip of clear adhesive tape along the lower edge. Remove completely the backing paper on the new switch panel.
Liquid crystal display
Connector for 7 way flat flexible cable
LCD Bezel
Figure 5: View of the Processor PCB assembly and Liquid Crystal Display
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Hold the switch panel over the case front and thread the flexible cable through the rectangular hole. Before pressing down, make sure that the cut out is precisely lined up with the recessed edges of the LCD window. Smooth the membrane switch panel down, starting from the LCD window and always working away from it, ensuring that there are no air bubbles. Remove completely the backing paper on the new membrane fascia label (ROW). Align the fascia label accurately with the case recess and smooth the label down, starting from the LCD window and always working away from it, ensuring that there are no air bubbles. Close the case. Perform the complete controller functionality tests (see Section 2.2 or 2.3).
4.6 REPLACING THE COMPRESSOR Disconnect the compressor from the power supply assembly at PL5 (see Figure 13), and disconnect the compressor supply tube at the reservoir nipple. Remove the large bore tube from the tubing clips on the side of the compressor chassis, and lift it clear. Remove the moisture drain assembly from the clip on the underside of the compressor chassis. Remove the screws, which hold the compressor chassis to the processor chassis, and the screws that hold the compressor chassis to the controller case. Tilt and lift the compressor assembly out of the case. Remove the screws that hold the compressor to the chassis, and remove the tube from the compressor outlet. Remove the compressor from the chassis, taking care not to damage the impact foam. Fit the compressor supply tube to the compressor exchange or new compressor. Position the compressor within the chassis, pass the connecting leads and tube through the grommets, and secure with the nuts, bolts, and washers. BE CAREFUL not to over tighten the nuts as this may damage the rubber mountings. Put the compressor chassis assembly back into the controller case with the rubber mountings pointing toward the fuses. Secure the chassis to the case with four screws and washers, and secure to the processor chassis with two screws and washers. Connect the tube to the reservoir and connect the lead to the power supply. Replace the large bore tube and the moisture drain into the tubing clips. Close the case. Perform the complete controller functionality tests (see Section 2.2 or 2.3).
4.7 REPLACING THE RESERVOIR Use standard antistatic precautions when handling the electronic PCB’s. Remove the old reservoir Disconnect the 14 way ribbon cable from the processor PCB assembly to the valve driver PCB assembly at PL4 and the small 4 way connector from the power supply assembly at PL3. (see Figures 6 and 7). Pull off the air supply tube from the compressor at the reservoir nipple. Remove the three screws and washers holding the reservoir to the case. Pull off the patient right air supply tube at the reservoir port. Unclip the moisture drain assembly from the compressor chassis and pull off the tube at the reservoir nipple. Lift up the reservoir and pull off the patient left air supply tube at the reservoir port. Remove the reservoir from the case.
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