3-20
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the MIC IN FUNCTION, repair the set according to the
following guide.
6-6. IN THE MIC IN FUNCTION
6-6-1. Solution
Please check and replace IC202 on Main Board or ICM101 on MIC board.
6-6-2. How to troubleshoot (Countermeasure)
1) Check MIC_SIG signal to Pin10 of CN200.
If no signal, Check the signal to Pin1 of CNM101 on the MIC board.
2) Check if MIC_SIG is entered from Pin1 of CNM101 to Pin3 of IC506 (MIC AMP).
3) Check if the amplified signal is entered from Pin4 of IC506.
If no signal output, check +12 V for IC506, replace IC506 with a new one if it has a problem.
4) Check if MCS_BCK, MCS_MLCK & MCS_LRCK is entered from IC501 to IC202.
If no signal, check +5 V & +3.3 V for IC508. If it is abnormal, change replace it a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
6-6-3. Service hint (Any picture / Remark)
0,&B287387
Y
0,&B,1387
IC501
MLC3700
IC600
TAS5548
PWM
DAC_BCK
DAC_LRCK
IC202
CS5346
MIC IN
MIC_I_DATADAC_MCLK
MIC
Board
MIG_SIG
IC506
S4308
IR AMP
IRS2092+IRF6775
< Signal check point >
< MIC IN function signal fl ow >
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