Sharp HT-DV40H Service Manual page 84

HT-DV40H
3. Both Video and Audio do not operate normally
The RF waveform is normal and the time is displayed normally, but no sound is produced. Or the sound has dropouts.
1. Insert disc into DISC loader.
2. When playback starts does the disc initialise ?
3. Is the RF signal level output from IC1 pin no 252 normal?
( Waveform drawing Figure 3 for CD and Figure 2 for DVD )
4. Replace Servo PWB.
5. Does the supply shows as +1.8V / + 3.3 V / + 5 V / + 12V?
6. Is Reset function OK?
7. Is clock frequency shows 27MHz?
8. Is the SDRAM is normal?
9. Is the DSP is normal?
10. Is the Audio out is normal?
11. Is the Video out is normal?
IC1
1
43
2
42
3
58
4
57
Figure 1
IC1
5
252
Figure 3
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No Repeat steps as Focus Errror system check occurred.
No Is the objective lens of optical pickups clean ?
No Replace optical pickup mechanism unit.
No Check supply ( IC3 Pin No. , +1.8V / CNP5 Pin 1, +3.3V /
CNP5 Pin 3, +5V / CNP5, +12V
No Check CNP4 pin no 18 .
No Check clock circuit ( XL1 , C86 , C92 )
No Check IC4 pin no 38 .
No Check IC1 Data Bus .
No Check Audio out circuit ( CNP13A Pin No.1 and 3 )
No
Check Video out circuit ( IC1 Pin No.211, 218, 219 and 221 )
IC1
5
252
IC6
6
2
7
9
7 – 3
Yes
Figure 2
Figure 4