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3-25
ONE POINT REPAIR GUIDE
9. SPEAKER NO AUDIO
Speaker No Audio
9-1. AMP IC
9-1-1. Solution
Please check and replace the component on MAIN board.
9-1-2. How to troubleshoot (Countermeasure)
1) Check supply voltage of AMP(CN700, CN701) & PWM signal
Normal Supply voltage and signal Check AMP IC.
Poor supply voltage Check SMPS Assy.
Poor signal Check PWM IC.
2) Check CSD of FET driver IC (IRS2092 : EAN60778301).
CSD has about 5 V on normal state.
When AMP has problem, CSD is LOW state or keep change LOW to HIGH.
9-1-3. Service hint (Any picture / Remark)
j u ^WWGw puGXSYGaGT[W}
w puGZS[GaGw nuk
w puG\S]GaGR[W}
j u ^WWGw puGXSYGaGR[W}
w puGZS[GaGw nuk
w puG\S]GaGT[W}
J\Gw puGGpjGTe Gjzk
Summary of Contents for CM9730
Page 11: ...MEMO 1 10 ...
Page 13: ...MEMO 2 2 ...
Page 59: ...MEMO 3 42 ...
Page 83: ...3 89 3 90 2 MAIN P C BOARD TOP VIEW ...
Page 84: ...3 91 3 92 MAIN P C BOARD BOTTOM VIEW ...
Page 85: ...3 93 3 94 3 VFD P C BOARD ...
Page 86: ...3 95 3 96 4 MAIN VOLUME P C BOARD 5 MIC P C BOARD ...
Page 87: ...3 97 3 98 6 JOG P C BOARD 7 USB P C BOARD 8 TUNER P C BOARD ...
Page 89: ...3 101 3 102 MEMO MEMO ...