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Section 3.1 Service

M I C R O T Y M P 1 T R O U B L E S H O O T I N G

Problem:

Buttons Stick

Possible Causes:

1. Button soldered to circuit board crooked
2. Interference between button and switch

Repair

1. CAUTION:

Prior to doing any work:
Unplug power cord
Use grounding mat and grounding strap

2. Disassemble stand to step #3 (removing the top housing, page 5).

3. Check to see that the black switches are soldered flush to the board.

4. If they are crooked (See fig below), heat up solder on the 2 pins and straighten.

5. If switches are ok, the white print and feed buttons need to be replaced. To do this pull them
straight off and replace them as shown in the figure below.

6. Assemble stand and check operation.

pg 28

Содержание Micro Tymp 1

Страница 1: ...panometric System 23600 handle 71130 printer charger Copyright 1995 Welch Allyn Co 4341 State Street Road Welch Allyn P O Box 220 Skaneateles Falls NY 13153 0220 Service manual pn236261 Rev D 6 95 ori...

Страница 2: ...2 5 20 SECTION 3 Problem Solving Troubleshooting 3 1 21 SECTION 4 Disassembly and Repair Handle disassembly 4 1 42 Handle re assembly 4 2 46 SECTION 5 Maintenance Printer charger disassembly 5 1 53 Pr...

Страница 3: ...validate the product warranty Please refer to the product warranty for specific coverage READ AND UNDERSTAND customer comments and complaints on accompanying documentation P O or other correspondence...

Страница 4: ...horized MicroTymp distributor agent or service representative This warranty does not include breakage or failure due to tampering misuse neglect accidents modification or shipping This warranty is als...

Страница 5: ...e 1 1 block diagram A 226 Hz probe tone is introduced in the sealed ear canal by a miniature loudspeaker A microphone records and monitors the sound pressure produced in the ear canal The sound level...

Страница 6: ...nst the ear canal opening to insure seal 2 Push START RUN button Micro Tymp automatically measures and displays results on the LCD Push memory button Ear symbol and repeat for other ear 3 Return instr...

Страница 7: ...TURN PUMP TO START POSITION DISPLAY PRESSURE RANGE ERROR WAITING FOR NEXT CYCLE TYMP DISPLAY SAVE DATA GRAPH COMPLETE ADMITTANCE CURVE FAST FLASHING BLOCK SYMBOL YES YES YES YES YES YES YES YES YES NO...

Страница 8: ...36 230 06 210 250 Probe tone Frequency 226 Hz Amplitude 85 dB 3 dB re 20 uPa in an ANSI HA 1 2cc coupler Admittance Range 0 2 to 4 0 mmho total 0 to 1 5 mmho for Ya 0 2 to 2 0 cc for 200 Vea Display R...

Страница 9: ...hd self tap screw right angle header paper spindle LB 1256 head driver power cord assy releasable cable tie printer and power supp PCB assy paper installation label base plate assy fuse 125ma slo blo...

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Страница 13: ...1 PHILLIPS 2501 1 SCREWDRIVER 2 PHILLIPS 2502 1 SCREWDRIVER 7 32 Flat Blade PH 143 36 1 WIRE CUTTER Xcelite 107CG 1 WIRE STRIPPER Xcelite 105SCG 1 LONG NOSE PLIERS XCELITE 51CG 1 HEMOSTATS 2 GROUND MA...

Страница 14: ...demon strated by the instructor More detailed background product information is found in the APPENDIX section and as such will be a critical element in a comprehensive service training program for te...

Страница 15: ...B DO THIS FOR PCB BOARD DO THIS FAST CLOCK SHALL BE BETWEEN FAST CLOCK SHALL BE BETWEEN 412 456 HEX IF NOT ADJUST C3 412 456 HEX IF NOT ADJUST R22 taken from A 00841 Lev 3 Item 4 taken from A 01777 Le...

Страница 16: ...PRESSURE COMPLIANCE CALIBRATION POINT RANGE Mbar 3 CC 1 CC 947 952 C5 C6 73 74 953 959 C4 C5 72 73 960 968 C3 C4 72 73 969 975 C2 C3 72 73 976 983 C1 C2 71 72 984 993 C0 C1 71 72 994 1000 BF C0 71 72...

Страница 17: ...C9 5D 5E 953 959 C7 C8 5D 5E 960 968 C6 C7 5C 5D 969 975 C5 C6 5C 5D 976 983 C4 C5 5C 5D 984 993 C3 C4 5C 5D 994 1000 C2 C3 5C 5D 1001 1008 C1 C2 5C 5D 1009 1017 C0 C1 5C 5D 1018 1020 BF C0 5C 5D 1021...

Страница 18: ...PARTICULAR COLUMN FOR READINGS AT 630 Hz AND 1000 Hz DO NOT SWITCH TO ANOTHER COLUMN 1 3 OCTAVE FILTER MAXIMUM SOUND LEVEL dB CENTER FREQ Hz 500 39 3 45 0 47 6 630 56 0 54 3 51 3 1000 38 3 40 0 45 5...

Страница 19: ...NG IS ABOVE 53 HEX readings will be high if the span is too narrow TURN R31 CLOCKWISE TO INCREASE the span between 0 and 200 daPa IMPORTANT RE CHECK at 0 and 200 daPa to verify that unit is within spe...

Страница 20: ...T WITH TIP OPEN TO THE ATMOSPHERE DEPRESS THE START RUN BUTTON MOMENTARILY THE OPEN SYMBOL on handle label SHALL FLASH REPEATEDLY ON THE LCD Step 13 BLOCK DETECT TEST WITH THE PROBE TIP OCCLUDED PRESS...

Страница 21: ...ONSISTENT FIGURE STEP 18 DISPLAY TEST PATTERN from A01785 fig 3H Step 19 CHARGE CURRENT TEST REFERENCE A 01777 TEST SPEC FOR LEVEL 3 STEP 6 SETUP AMMETER IN LINE BETWEEN A 14 VDC POWER SOURCE AND THE...

Страница 22: ...Section 2 4 Service MT 1 CALIBRATION PROCEDURE CALIBRATION NOTES date____ ____ ____ pg 19...

Страница 23: ...rocedure below Modification Procedure 1 Disable the right ballast compartment by disconnecting the tube connected to it and sealing off the tube with appropriate plug and Black Max adhesive Do not rem...

Страница 24: ...3 Increase in 200 Vcc Actual Vol 0cc 1 0cc 1 5cc 2 0cc Elevation 1850m 6100 ft 1 3 4 5 2300m 7500 ft 1 3 5 2700m 8800 ft 2 4 6 3100m 10 100 ft 2 5 7 3400m 11 200 ft 3 5 8 3750m 12 300 ft 3 6 9 4100m 1...

Страница 25: ...LACE LCD FRAME COLD SOLDER ON IC RE FLOW SOLDER DEF ZEBRA STRIPS REPLACE ZEBRA STRIPS 3 PRESSURE READING OUT OF SPEC DEF U 4 REPLACE U 4 DEF TRANSDUCER REPLACE TRANSDUCER 4 PUMP STICKS PULLEY HAS SEPA...

Страница 26: ...ESTORE SOUND CLOGGED PROBE TIP CLEAN PROBE TIP TUBES DEF CRYSTAL REPLACE CRYSTAL DEF SPKR OR MIC REPLACE DEF COMPONENT COLD SOLDER JOINTS REPAIR SPKR MIC JOINTS 9 COMPLIANCE DOES NOT ADJUST DEF MICROP...

Страница 27: ...O SPEC 3 DEFECTIVE PRINT DEF PRINT HEAD REPLACE PRINT HEAD DEF PLATEN BAR REPLACE PLATEN BAR 4 PRINTOUT READS NO HANDLE DIRTY WELL CONTACTS CLEAN CONTACTS DEF CONNECTING CABLE REPAIR CABLE 5 PAPER DOE...

Страница 28: ...motor is defective e the diaphragm piston is mis aligned 3 Microtymp displays Pressure Range Error only a there is blockage between the probe tip and the valve b the hose is pinched c cold solder join...

Страница 29: ...ed speaker b open or shorted microphone c defective pre amp U11 and associated components d defective Y1 11 Compliance readings erratic a defective R24 and or R33 and or R70 and or R69 12 Block symbol...

Страница 30: ...able c defective optical interrupt d diaphragm piston has disconnected from top of drive helix 18 Low battery symbol a defective R66 C17 or U4 b defective R65 R19 or open trace n flex cable 19 Battery...

Страница 31: ...pproximately 2cc or lower The reading on the calibrator is 4F or lower LOW BATTERY SYMBOL The Low Battery Symbol is displayed when the 7 2 VDC rated source either battery or power supply is between 6...

Страница 32: ...d Use grounding mat and grounding strap 2 Disassemble stand to step 3 removing the top housing page 5 3 Check to see that the black switches are soldered flush to the board 4 If they are crooked See f...

Страница 33: ...Printer driver defective bad LB1256 Repair 1 CAUTION Prior to doing any work Unplug power cord Use grounding mat and grounding strap 3 Disassemble stand to step 3 Removing top housing page 5 4 Check b...

Страница 34: ...14 5 ohms and pin 6 was max at 17 9 ohms the difference would be 3 4 ohms This is defective If all pins are ok go to the next step Replace the printer head remove the print switch switch closest to t...

Страница 35: ...revent electrical shock To set printer contrast you will need a frequency counter or an oscilloscope Using a frequency counter set it to the 10 khz scale Using an oscilloscope set the volts div scale...

Страница 36: ...o so rotate the grooved shaft clockwise until the printer head is all the way to the left end of the shaft Remove the platen bar by pulling up on the right side of it and sliding it out from under the...

Страница 37: ...board If they are ok go on to the next step If they are not solder them assemble the printer and check 9 To remove the driver chip LB1256 first separate the 2 boards step 5 separating circuit boards p...

Страница 38: ...g page 5 3 With solder and soldering iron reflow solder to side contacts making sure not to apply heat too long CAUTION Applying too much heat will cause the housing to melt see fig below 4 Assemble s...

Страница 39: ...C R O T Y M P 1 T R O U B L E S H O O T I N G Problem Printer charger doesn t print or feed but green LED is on Possible cause 1 Microprocessor locked up Repair 1 Unplug stand and plug back in to res...

Страница 40: ...acts Repair 1 Rule out handle problem by putting in another printer stand and checking printout If handle is ok go on to the next step 2 CAUTION Prior to doing any work Unplug power cord Use grounding...

Страница 41: ...ill cause the housing to melt Assemble stand and check If the problem still exists go on to the next step 6 Check the data contacts for any interference that may be caused by the pad see fig page 17 I...

Страница 42: ...ng 4 screws 3 Check to see that the fuses are not blown If unsure remove and check with an ohm meter If blown i e overload reading on the ohm meter replace them Assemble stand and check 4 Check to see...

Страница 43: ...2 CAUTION Prior to doing any work Unplug power cord Use grounding mat and grounding strap 3 Disassemble stand up to and including step 4 removing circuit boards page 6 To remove D711538 processor pee...

Страница 44: ...xt step If not remove it and rewind the paper until it is tight Feed the paper and check to see if it works 2 CAUTION Prior to doing any work Unplug power cord Use grounding mat and grounding strap 3...

Страница 45: ...ing If it is ok go on to the next step Remove the paper in the printer by cutting it at the roll and pulling through in the direction the paper normally feeds Do not pull paper through backwards 2 CAU...

Страница 46: ...OLLOW THIS PROCEDURE FOR DECIDING WHEN TO REPLACE THE NI CAD BATTERY IN A MICRO TYMP 1 HANDLE READ THE CUSTOMER COMPLAINT FIRST SCENARIO 1 If the unit FUNCTIONS the battery has held sufficient charge...

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Страница 48: ...THE BATTERY COVER ON REMOVE THE COVER B 2 REMOVE PATIENT SIDE HOUSING HALF REMOVE THE WELCH ALLYN LOGO LABEL LOCATED ON THE PATIENT SIDE BY SLIDING A PAIR OF TWEEZERS UNDER THE LABEL AND LIFT OFF OLD...

Страница 49: ...N ASSEMBLY DRAWING LAY THE HANDLE DOWN AS SHOWN AND PRESS WITH LEFT THUMB AND PUSH AS SHOWN FIGURE 4 3 INSERT YOUR FINGER IN BETWEEN THE PUMP TOP PAD AND THE CASE TO SEPARATE THESE TWO ITEMS AS THIS W...

Страница 50: ...BOARDS THEY APPEAR TO HAVE BEEN CUT THESE WERE TESTING WIRES DURING MANUFACTURING PROCESS WIRES REMOVE THEM DO NOT SOLDER THEM TOGETHER C 1 REMOVE KEYPAD ASSEMBLY CAUTION FLEX CIRCUIT IS SOLDERED TO K...

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Страница 53: ...RAME INTO THE SLOTS OF LCD RETAINER FLEX SIDE FIRST NEXT PUT THE OTHER TWO PLASTIC ARMS IN THE SLOTS ONE AT A TIME TO PREVENT BREAKAGE PLACE THE LCD ASSEMBLY AND THE RUB BER SWITCH ARRAY INTO THE FRON...

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Страница 55: ...BLACK WIRE MOTOR LEAD TO THE HOLE TO THE LEFT OF IT TEST FOR MOTOR OPERATION BY OPERATING THE MICROTYMP K 2 ADJUST SWEEP RATE FOR NEW MOTOR step 1 LOOSEN 4 SCREWS WHICH HOLD THE CIRCUIT BOARD AND BATT...

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Страница 57: ...ING THE BELT OR PULLEYS TIGHTEN THE FOUR SCREWS IN THE PUMP FRAME IMPORTANT NOTE USE THIS REPAIR ON UNITS THAT THE PISTON PULLEY THREADS BECOME EASILY DISENGAGED PISTON GETS STUCK AT TOP OF STROKE AND...

Страница 58: ...EPARTMENT AT WELCH ALLYN PHONE NUMBERS ARE LISTED ON PAGES 1 1 AND 1 2 L 2 INSTALL FOAM PAD REFER TO FIGURE 4 9 BELOW DISASSEMBLE THE PUMP AS DESCRIBED ABOVE INSPECT THE FOAM PAD AND THE HOUSINGS FOR...

Страница 59: ...NTO THE HOUSING FIRST THE WIR ING HARNESS SLIPS INTO THE POWER JACK HOLDER WITH THE PATIENT SIDE UP AND VIEWING THE POWER JACK ASSEMBLY FROM THE BOTTOM OF THE HANDLE CONNECT WIRES AS FOLLOWS WHITE WIR...

Страница 60: ...MAKING SURE NOT TO PINCH THE HOSE TIGHTEN THE TWO SCREWS CHECK THE HOUS INGS TO MAKE SURE THEY ARE MATED UNIFORMLY AROUND ALL EDGES WIPE THE MOUNTING AREA FOR THE LABEL WITH A SWAB DAMPENED WITH ISOPR...

Страница 61: ...LEFT EAR STORE BUTTON AGAIN THE INFORMA TION STORED IS THE FIRST STEP SHOULD BE SHOWN ON THE LCD RE PEAT THIS RECALL TEST FOR THE RIGHT EAR VERIFY MEMORY ERA SURE PRESS AND HOLD THE LEFT EAR BUTTON ME...

Страница 62: ...ON ITS BACK AND UNSCREW 4 SCREWS FROM THE BOTTOM OF THE PRINTER CHARGER REMOVE BOTTOM PLATE SEE FIG 5 1 ABOVE A 2 REMOVE TOP HOUSING UNSCREW 3 SCREWS SEE FIGURE BELOW VISIBLE THROUGH OBLONG SLOT THES...

Страница 63: ...SUPPLY BOARD THIS JACK CONTAINS RED BLACK BLUE AND YELLOW WIRES REMOVE ANY ADHESIVE THAT MAY BE HOLDING THIS JACK TO THE BOARD REMOVE THE PAPER IN THE PRINTER BY CUTTING IT FROM ROLL PULL IT IN THE DI...

Страница 64: ...K FASTEN THE GREEN WIRE ON US AND CANADIAN VERSIONS TIGHTEN THE SCREW THAT HOLDS THE GROUND WIRE ONTO THE TRANSFORMER AND THE GROUND WIRE FROM THE TOP HOUSING OPPOSITE SCREWS ON AUSTRALIA EUROPE JAPAN...

Страница 65: ...econds are not used for this readout 3 Put a 2 CC cavity onto the MicroTymp 1 probe tip Desired values and tolerances in counts will be displayed on meter per Fig 2 below Fast Clock 0435 20 Pressure 8...

Страница 66: ...igh altitude information page A SPEC A 00848 2 A 00849 2 A 01745 A 01785 1 A 01862 1 High altitude modifications END Micro Tymp Tympanometric System 23600 handle 71130 printer charger Copyright 1995 W...

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