3-22
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the MIC IN function, repair the set according to the following guide.
9-4. MIC IN FUNCTION
9-4-1. Solution
Replace IC200, IC201 on MAIN board.
9-4-2. How to troubleshoot (Countermeasure)
1) Check MIC_SIG signal to pin6 of CN200.
If no signal, check the signal to pin7 of CN3M01 on the FRONT board.
Check if the signal is entered from pin6 of CN200 to MAIN board.
2) Check if MIC_SIG is entered from pin6 of CN200 to pin2, pin13 to IC201(MIC AMP).
3) Check if the amplified signal comes out from pin3 & pin12 of IC201.
If no signal output, check +3.3 V for IC201, replace IC201 with a new one if it has a problem.
4) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC200.
5) Check if ADC_DATA is entered from IC200 to IC501.
If no signal, check +3.3 V(ADC) for IC200. If is NG, replace it a new one.
6) Check the following I2S signal flow from IC501 to IC600.
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.
9-4-3. Service hint (Any picture/ Remark)
< MAIN board bottom view >
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