3-21
< MAIN board bottom view >
IC201
IC201
PT_L/R
PT_L/R
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the PORT. IN function, repair the set according to the following guide.
10-3. PORT. IN FUNCTION
10-3-1. Solution
Replace IC201 on MAIN board.
10-3-2. How to troubleshoot (Countermeasure)
1) Check PT_L/R signal from FRONT board to MAIN board.
2) Check if PT_LR is entered pin25 & 27 of CN605
pin25 & 27 of CN315.
3) Check PT_L/R signals to IC201(pin9, 10).
4) Check if ADC_BCK, ADC_LRCK & DAC_MCLK are entered from IC501 to IC201.
5) Check if ADC_DATA is entered from IC201 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it a new one.
6) Check the following I2S signal flow from IC501 to IC202.
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
7) Check if the digital audio AMP block is okay.
If AMP is damaged, replace it with a new one.
10-3-3. Service hint (Any picture / Remark)
{TG
IC501
MLC3730
IC202
PS9860
PWM
MCS_BCK
MCS_LRCK
{
IC201
CS5346
POT. IN
ADC/MIC_DATA
MCS_MCLK
POT_L/R
VOLUME
Board
IR AMP
IRF6775
MIX_DATA_OUT
< PORT. IN function signal
fl
ow >
Summary of Contents for CM9750
Page 15: ...2 2 ...
Page 19: ...4 SPEAKER SECTION A60L A60R ...
Page 75: ...3 71 3 72 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD TOP VIEW ...
Page 77: ...3 75 3 76 2 MAIN P C BOARD TOP VIEW ...
Page 78: ...3 77 3 78 MAIN P C BOARD BOTTOM VIEW ...
Page 79: ...3 79 3 80 3 FRONT P C BOARD TOP VIEW ...
Page 80: ...3 81 3 82 FRONT P C BOARD BOTTOM VIEW ...
Page 81: ...3 83 3 84 4 FRONT_CTRL P C BOARD TOP VIEW BOTTOM VIEW ...