Panasonic AG-520VDH Service Manual page 76

AG-520VDH
Spindle Motor Operation Problem
Note: Check the signal at TP8809 as soon as disc has been inserted. Otherwise, following waveform can not be monitored.
Check the signal at TP8809 (SPIN) on the DVD Main
C.B.A.
OK
Replace IC8801 on the DVD Main C.B.A.
Still NG
DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
Signal at TP8809
OK
OR
100 mV 1 s 100 mV
(Disc Spinning) (No Disc Spinning)
Traverse Operation Problem
Check the signal at TP8813 and TP8812 on the DVD
Main C.B.A.
NG
Check the signal at TP8807 (TRVIN) on the DVD
Main C.B.A.
NG
IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
12
1.5 Vp-p
V1 1.5 Vp-p V1
2 V 5 ms 2 V
TP8813 TP8812
NG IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
OK NG
1 s 100 mV
OK DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
OK IC8801 on the DVD Main C.B.A. is defective.
Replace IC8801 on the DVD Main C.B.A.
0.2 Vp-p
V1
500m V 4 ms
5 ms
TP8807
Pickup Operation Problem
Note: Check the voltage during 10 to 20 seconds as soon as disc has been inserted.
Check the voltage at TP8903 on the DVD Main C.B.A.
Is it +5.0 V ?
OK
Check the voltage at TP8923 on the DVD Main C.B.A.
Is it +2.2 V ?
OK
Check the voltage at TP8906 on the DVD Main C.B.A.
Is it +5.0 V ?
OK
Confirm Wave form at TP8916
from normal DVD Movie or CD.
If the Message "PLEASE CHECK THE DISC, AND
1 s
FOR STAINS OR SCRATCHES ON DISC" appears.
IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
RF Signal at TP8916
470 mVp-p
200 mV 100 ns
(DVD Playback)
76
NG
Repair the around circuit of "SW_+5V_DVD" line.
NG
Replace the IC8001 on the DVD Main C.B.A.
NG Check the voltage at Q8905 (Base) on the DVD Main
C.B.A. Is it +3.3 V ?
NG OK
Replace the Q8905 and Q8906
on the DVD Main C.B.A.
Replace the IC8001 on the
DVD Main C.B.A.
NG DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
400 mVp-p
200 mV 50 ns
(CD Playback)
TROUBLESHOOTING HINTS
AG-520VDH