3-9
ONE POINT REPAIR GUIDE
NO BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order
(HELLO --> VOL XX --> CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
4-4. SDRAM (IC502)
4-4-1. Solution
Please check and replace IC502 on MAIN board.
4-4-2. How to troubleshoot (Countermeasure)
1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.
If pin17(#CAS), pin18(#RAS), pin19($CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,
check damping resistor (R508, R506, R504, R507).
2) If resistor is OK, then replace IC502 (SDRAM).
3) After change IC502, if It is still not below waveform, check IC501 (DSP IC).
4-4-3. Service hint (Any picture / Remark)
} jj
y
V jz
y hz
V ~ l
jhz
< Signal check point >
< Signal waveform >
Содержание CM9730
Страница 11: ...MEMO 1 10 ...
Страница 13: ...MEMO 2 2 ...
Страница 59: ...MEMO 3 42 ...
Страница 83: ...3 89 3 90 2 MAIN P C BOARD TOP VIEW ...
Страница 84: ...3 91 3 92 MAIN P C BOARD BOTTOM VIEW ...
Страница 85: ...3 93 3 94 3 VFD P C BOARD ...
Страница 86: ...3 95 3 96 4 MAIN VOLUME P C BOARD 5 MIC P C BOARD ...
Страница 87: ...3 97 3 98 6 JOG P C BOARD 7 USB P C BOARD 8 TUNER P C BOARD ...
Страница 88: ...3 99 3 100 9 SPEAKER LED_MAIN P C BOARD TOP VIEW 10 SPEAKER LED P C BOARD TOP VIEW BOTTOM VIEW BOTTOM VIEW ...
Страница 89: ...3 101 3 102 MEMO MEMO ...