Panasonic PVD4735S - DVD/VCR DECK, Service Manual

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PV-D4735S/PV-D4745/PV-D4745S/PV-D4745S-K
TROUBLESHOOTING HINTS
Replace the IC8001 on the DVD Main C.B.A.
NG
OK
(CD Playback)
DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
NG
NG
OK
OK
Check the voltage at TP8923 on the DVD Main C.B.A.
Is it +2.2 V ?
Pickup Operation Problem
RF Signal at TP8916
IC8801 on the DVD Main C.B.A. is defective.
Replace IC8801 on the DVD Main C.B.A.
IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
If the Message "PLEASE CHECK THE DISC, AND
FOR STAINS OR SCRATCHES ON DISC" appears.
Check the signal at TP8813 and TP8812 on the DVD
Main C.B.A.
Check the signal at TP8807 (TRVIN) on the DVD
Main C.B.A.
Traverse Operation Problem
IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
NG Confirm Wave form at TP8916
from normal DVD Movie or CD. DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
50 ns 200 mV
400 mVp-p
Check the voltage at TP8906 on the DVD Main C.B.A.
Is it +5.0 V ?
Replace the Q8905 and Q8906
on the DVD Main C.B.A.
Replace the IC8001 on the
DVD Main C.B.A.
NG OK
NG
OK
Note : Check the voltage during 10 to 20 seconds as soon as disc has been inserted.
OK
Repair the around circuit of "SW_+5V_DVD" line.
NG
Check the voltage at TP8903 on the DVD Main C.B.A.
Is it +5.0 V ?
Check the voltage at Q8905 (Base) on the DVD Main
C.B.A. Is it +3.3 V ?
Spindle Motor Operation Problem
DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
Replace IC8801 on the DVD Main C.B.A.
NG Check the signal at TP8809 (SPIN) on the DVD Main
C.B.A.
OK
Still NG
Signal at TP8809
Note : Check the signal at TP8809 as soon as disc has been inserted. Otherwise, following waveform can not be monitored.
(DVD Playback)
100 ns
200 mV
470 mVp-p
100 mV 1 s 100 mV 1 s 100 mV 1 s
(Disc Spinning)
OK OK
(No Disc Spinning)
OR
NG
TP8813 TP8812 TP8807
500m V
2 V
V1
0.2 Vp-p
V1
1.5 Vp-p
V1 1.5 Vp-p
4 ms
5 ms
2 V 5 ms
PV-D4735S / PV-D4745 / PV-D4745S / PV-D4745S-K
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