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3-5
ONE POINT REPAIR GUIDE
4. PROTECTION
4-1. D(DC) PROTECTION
4-1-1. Solution
Replace IC301(AMP IC) on MAIN board.
4-1-2. How to troubleshoot (Countermeasure)
1) Press the power button, the display is normal, no sound output. (D Protection or S Protection)
2) Check DC Voltage of speaker out Front Left c & -(JK300 pin2, 1), Front Right c & -
(JK300 pin4, 3).
3) Check resistor crack, cold solder of PWM IC out (R310, R313, R320, R322).
4) If PWM IC out is ok & speaker out(+/-) has DC Voltage, Replace IC301(AMP IC) on MAIN board.
4-1-3. Service hint (Any picture/ Remark)
< MAIN board top view >
IC300 (PWM IC)
IC300 (PWM IC)
IC301 (AMP IC)
IC301 (AMP IC)
R310, R313,
R310, R313,
R320, R322
R320, R322
JK300
JK300
Содержание CM2760
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