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3-15
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the CD FUNCTION, repair the set according to the following guide.
6-2. CD FUNCTION
6-2-1. Solution
Replace IC501 on MAIN board.
6-2-2. How to troubleshoot (Countermeasure)
1) Check CD_BCK, CD_LRCK, & CD_DATA signals from IC501 to IC401.
If no signal, check if the RF & servo signals from MD is entered to IC401.
Refer to the “No operation of MD” guide on Item 5.
2) Check the following I2S signal flow. < I2S audio signal Interface >
- MCS_BCK :
IC501_pin E1 --> IC601_pin23
- MCS_LRCK :
IC501_pin D1 --> IC601_pin22 (44.1 kHz)
- MIX_DATA0_OUT :
IC501_pin E2 --> IC601_pin24
- MCS_MCLK :
IC501_pin D2 --> IC201_pin44
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.
6-2-3. Service hint (Any picture/ Remark)
< Waveform of I2S audio interface signals >
< MAIN - CD DSP circuit >
< MAIN board top view >
IC501
IC501
R503
R503
Summary of Contents for OM7560
Page 13: ...1 12 ...
Page 19: ...2 8 ...
Page 53: ...3 34 2 SDRAM IC502 Fig 2 SDRAM 7 6 8 5 8 6 7 5 ...
Page 66: ...3 77 3 78 2 MAIN P C BOARD TOP VIEW ...
Page 67: ...3 79 3 80 MAIN P C BOARD BOTTOM VIEW ...
Page 68: ...3 81 3 82 3 TOP FRONT P C BOARD TOP VIEW ...