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Muting circuit Troublrshooting (MUTE condition)
Q752(A102) Base "HIGH"
YES
Q604, Q605(D1302) BASE "HIGH" check
YES
MUTE
Unfelt voice
Input check (AUX ➝ 9.36 TUNER ➝ 6/39 TAPE ➝ 7/38CD ➝ 8/37PIN)
YES
IC601 20/25PIN output check
YES
IC601 input check (22/23PIN)
YES
IC601 output check (24PIN)
YES
NORMAL
NO
c-COM operation status check
Q603(A102) operation status check
Replace when Q603(A102) is defective
NO
Replace each related TR
NO
Check input and operation status for each function
NO
Refer to IC401(NJW1190) IC specification
NO
c-COM check and (CLK/DATA check)
NO
Check IC401 24PIN cover 8V and power circuit
Power operation staus check (DC12V)
R634 180(9.1)V check
- 2-2 -
NO
YES
c-COM 2PIN(A-MUTE) LINE check
YES
YES
YES
NO
CN942/CN701 connection status
check
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