Welch Allyn Micro Tymp 1, Service Manual

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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
MODEL #: 23600
PROBLEM:
CAUSE: CORRECTIVE ACTION:
6. MECHANICAL *VALVE LEAKS .................. *CHECK / REPLACE VALVE
LEAKS PRESENT. *’T’ FITTING LEAKS. ......... *CHECK / RESEAL / REPLACE
*PROBE TIP LEAKS ............ *REPLACE PROBE TIP
*PISTON DIAPHRAGM ....... *RESEAL / REPLACE
*OTHER COMPONENTS .... *REPLACE ACCORDINGLY
7. LCD “LEAK” SYMBOL *INSUFFICIENT *CHECK / REPLACE
CUSTOMER CAN’T CAPACITY .......................... DIAPHRAGM
GET A ‘SEAL’ *CHECK CUSTOMER’S
ALTITUDE. IF UNIT WORKS
WELL AT YOUR LOWER
ALTITUDE, THEN MAKE
HIGH ALTITUDE MODIFICATION.
(UTILIZES ONE BALLAST).
SEE SECT. 2.5 IN THIS MANUAL.
*PRESSURE CIRCUIT
OUT OF ADJUSTMENT ....
*READJUST GAIN SECTION
OF PRESSURE CIRCUIT
8. NO ‘DELTA’
COMPLIANCE
*NO SOUND ................. ......... *CHECK / RESTORE 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. MICROPHONE .......... *REPLACE MIC.
*INTERMITTENT POT(S) ... *REPLACE POT(S) SEE NOTE*
IF BOARD TAPPED/FLEXED BELOW.
*COMPONENT DISLODGED
FROM PROBE TIP .............
*CHECK PROBE TIP TUBES
TO COMPONENTS
*NOTE:
1-WITH NO CAVITY ON PROBE TIP AND PCB IS TAPPED OR FLEXED:
PIN 25 IS 100MVDC. IF ERRATIC, REPLACE R24
2-WITH 2CC CAVITY ON PROBE TIP AND PCB IS TAPPED OR FLEXED:
A PIN 20 OF U4 IS 2.5VDC. IF ERRATIC, REPLACE R33
B IF VOLTAGE AT PIN 5 OF U11 IS ERRATIC, REPLACE R70
C IF VOLTAGE AT PIN 7 OF U11 IS ERRATIC, REPLACE R69
10. NO SOUND/FAILS
DISTORTION
*DEF. SPEAKER .................. *REPLACE SPEAKER
*COLD SOLDER JOINT ...... *REFLOW SOLDER
*DEF.U-5 (3080E)................. *REPLACE U-5 PN.230047
*DEF.U-4 (HI2340P-A) ........ *REPLACE U-4 PN.23609-2
END HANDLE TROUBLESHOOTING
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