3-20
< MAIN board top view >
IC200
IC200
PTB_L to pin21
PTB_L to pin21
PTB_R to pin22
PTB_R to pin22
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the PORT. IN function, repair the set according to the following guide.
9-2. PORT. IN FUNCTION
9-2-1. Solution
Replace IC200 on MAIN board.
9-2-2. How to troubleshoot (Countermeasure)
1) Check PT_L/ R signal from FRONT board to MAIN board.
2) Check if PT_L/ R is entered pin1 & pin3 of CN201.
3) Check PT_L/R signals to IC201(pin9, pin10).
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.
9-2-3. Service hint (Any picture/ Remark)
T-
IC501
IC600
PWM
MCS_BCK
MCS_LRCK
IC200
POT. IN
ADC_DATA
MCS_MCLK
POT_L/R
Front
Board
IR AMP
MIX_DATA_OUT
< PORT. IN function signal
fl
ow diagram >
Содержание CJ87
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Страница 79: ...3 59 3 60 4 JACK P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...