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D. REPAIR PROCEDURE
C-3040 Zoom
D. REPAIR PROCEDURE
[1] TROUBLESHOOTING GUIDE .................................................................................. D-2 POWER LOSS INOPERATIVE ................................................................................ D-2 TAKING INOPERATIVE ........................................................................................... D-2 NO PICTURE ........................................................................................................... D-2
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D. REPAIR PROCEDURE
C-3040 Zoom
[1] TROUBLESHOOTING GUIDE
POWER LOSS INOPERTIVE
IC301-91 (SCAN IN 0) PULSE INPUT
TAKING INOPERATIVE
PUSH SHUTTER BUTTON
NO
CHECK PFC include POWER SW, CN301, R3021
YES
IC302-7 (UNREG)
LOW
CHECK ST1, CA2
IC301-3, 7 (SCAN IN 3) PULSE INPUT
NO
CHECK PFC include POWER SW, CN301, R3023, R3024
HIGH
IC301-81 (VDD)
YES LOW
CHECK IC302 CN301-7, 8 (P ON, P(A) ON)
LOW
CHECK IC301, Q3005, Q3006, ST1
HIGH
IC301-84 (RESET)
HIGH LOW
CHECK IC302, R3051 CN301-6, 12, 13 HIGH
NO
CHECK IC301, CA2, ST1
HIGH
IC301-85 (BAT OFF)
YES LOW
CHECK R3052 SERIAL COMMUNICATION
NG
CHECK IC301, CA2
HIGH
IC301-80 OSCILLATION
OK NO
CHECK X3001 CHECK CA2
YES
IC301-82 OSCILLATION
NO
CHECK X3002, R3004, C3001, C3002
YES
CHECK IC301
NO PICTURE
CLK (72MHz) INPUT TO IC102-280 (CLK IN 1)
YES
MAIN CLOCK FOR SYSTEM OPERATION NO OPERATION IF ABSENT CHECK X1101 OSCILLATOR AND IC111
NO
CLK (36 MHz) INPUT TO IC101-132 (CLK IN 1)
NG
BASIC CPU BLOCK CHECK IC102-278
OK
IC101-61 (ZAS)
NG
ALWAYS APPEARS WHEN CPU, ETC. IS ACCESSED CHECK IF CPU IS READKING PROGRAM, AND CHECK ADDRESS AND DATA BUS OF IC121 REQUEST FOR USE OF DATA BUS FROM ASIC TO CPU NO DMA TRANSMISSION IF ABSENT RECEIVES ZBREQ SIGNAL AND GIVES PERMISSION TO ASIC FOR USE OF DATA BUS NO DMA TRANSMISSION IF ABSENT INCORRECT HANDSHAKING BETWEEN 8-BIT CPU AND RS-232C CHECK EACH INTERFACE
OK
IC101-52 (ZBREQ)
NG
OK
IC101-56 (ZBGRNT)
NG
OK
IC101-118, 119 (IRL1, 2)
NG
OK
CHECK SOLDERING OF EACH CPU AND MEMORY PIN
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