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1. No drive signals supplied at motors
Check drive signals at pins 1 to 4 of K6U on Power Board.
Check ICs IC5501, IC5551 and peripheral circuits. Check
motor drive power supply (9VMCI).
2. No drive signals supplied at motor drive ICs.
Check drive signals at pins 3-4 (ZOOM), 5-6 (FOCUS) of
k6S. Check IC801.
3. No drive signals output from CPU.
Check drive signals at pins 29,30, 33, 34 of IC801(SUB
CPU). Check IC801.
4. No key switch signals input to CPU.
Check signals at pins 50 to 52 of IC801 when pressing the
key buttons. Check key buttons.
Troubleshooting
PRE-AMP.
No Sound
1. No audio signals at A
V input circuit.
Check audio signals at pins14 and 15 of IC5011 on AV
Board. Check IC5011 and peripheral circuits.
2.
Incorrect operation of VIDEO/COMPUTER mode
switching.
Check AV/PC switching signal at pins 10 and 11 of
IC5011. Check IC5011, IC801 and switching signal.
AV :Low, PC : High
3. No audio output signal at speaker
.
Check audio signal at pins 1 and 3 of K8F on Main Board.
Check MUTE signal at pin 4 of IC031.
Mute On : High
Check MUTE signal at pin 7 of IC1831, pins 7 and 13 of
IC1881, and peripheral circuit.
Mute On : High
Check sound volume signal at pins 27, 28 of K10U, and
pin 14 of IC1831.Check IC IC001, IC031 and peripheral
circuit.
Volume Min.: Low
4. No power supply at audio circuit.
Check 6V(6V AUDIO) power supply line.
