3-15
ONE POINT REPAIR GUIDE
6. NO SOUND
There is no sound output in the CD FUNCTION, repair the set according to the follow-
ing guide.
6-1. IN THE CD FUNCTION
6-1-1. Solution
Please check and replace IC501, IC600 on MAIN board.
6-1-2. How to troubleshoot (Countermeasure)
1) Check CD_BCK, CD_LRCK, & CD_DATA signals from IC407 to IC501.
If no signal, check if the RF & servo signals from MD is entered to IC407.
Refer to the “No operation of MD” guide.
2) Check the following I2S signal flow. < I2S audio signal Interface >
- MCS_BCK : IC501_pin4 --> IC600_pin23
- MCS_LRCK : IC501_pin5 --> IC600_pin22 (44.1 kHz)
- MCS_DATA_OUT : IC501_pin85 --> IC600_pin24
- MCS_MCLK : IC501_pin3 --> IC501_pin82
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.
3) Check if “Digital audio AMP block”.
6-1-3. Service hint (Any picture / Remark)
< Waveform of I2S audio interface signals >
LRCK / BCK / DATA(IC501 Pin83, 84, 85)
< I2S Signal Flow >
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