TC- 446 Service Manual
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41
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Repair Example
:
1) Symptom: Plug in 6.0 power cable, rotate power knob but unable to switch on power; voltage at L15
OK; no 7.5V at IC4 IN; power knob OK;
Cure: replace D20
2) Symptom: Plug in 6.0 power cable, rotate power knob but unable to switch on power; Voltages at
L15, IC4 IN OK; no 5V (5M) voltage at IC4;
Cure: replace IC404
3) Symptom: Plug in 6.0 power cable, rotate power knob but unable to switch on power; 5V output at
IC4; Voltage at IC9 OK;
Cure: replace X3
(
7.3728MHz crystal
)
Содержание TC-446
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