3-24
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the AUX FUNCTION, repair the set according to the fol-
lowing guide.
5-4. IN THE AUX FUNCTION
5-4-1. Solution
Please check and replace IC202 on MAIN board.
5-4-2. How to troubleshoot (Countermeasure)
1) Check AUX_L/R signals to IC202 (Pin7, 8).
2) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC602. (Refer to Item 5-1.)
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.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 5-2.
If AMP is damaged, replace it with a new one.
5-4-3. Service hint (Any picture / Remark)
kRGGGXXGGju]WY
h| sGGyYWYh|yGGyYWZ
hkjijrGGyYX]
h kj kh{hGGGyYX\
hkjsyjrGGyYX`
hkjtjsrGGyYYX
pjYWY
AUX
{T
IC501
MLC9800
IC602
PS9850
PWM
IC801
FS502B
BEAT BOX
AMP IC
TAS5631
DAC_BCK
DAC_LRCK
IC202
CS5346
DAC_DATA DAC_MCLK
ADC_DATADAC_MCLK
AUX_L /R
BEAT_DATA
< Signal check point >
< AUX function signal fl ow >
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