Panasonic PV-DF204 Service Manual page 173

Spindle Motor Operation Problem
Note: Check the signal at TP8808 as soon as disc has been inserted. Otherwise, following waveform can not be monitored.
Check the signal at TP8808 (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 TP8808
OK
OR
500 mV 1 s 500 mV
(Disc Spinning) (No Disc Spinning)
Traverse Operation Problem
Check the signal at TP8801 and TP8802 on the DVD
Main C.B.A.
NG
Check the signal at TP8814 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.
V1 1.8 Vp-p V1 2.0 Vp-p
13
2 V 5 ms 2 V 5 ms
TP8801 TP8802
NG IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
OK NG
1 s 500 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.
V1 0.5 Vp-p
1 V 5 ms
TP8814
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 ?
Check the voltage at TP8923 on the DVD Main C.B.A.
Is it +2.2 V ?
Check the voltage at TP8906 on the DVD Main C.B.A.
Is it +5.0 V ?
Confirm Wave form at TP8916
from normal DVD Movie or CD.
1 s
IC8001 on the DVD Main C.B.A. is defective.
Replace IC8001 on the DVD Main C.B.A.
RF Signal at TP8916
600 mVp-p
200 mV 50 ns
(DVD Playback)
NG
Repair the around circuit of "5V-FEP" line.
OK
NG
Replace the IC8001 on the DVD Main C.B.A.
OK
Check the voltage at TP8925 on the DVD Main C.B.A.
NG
Is it +2.0 V ?
OK
NG
NG DVD Mechanism Unit is defective.
Replace the DVD Mechanism Unit.
If the Message "PLEASE CHECK THE DISC, AND
FOR STAINS OR SCRATCHES ON DISC" appears.
400 mVp-p
200 mV 50 ns
(CD Playback)
PV-DF204/PV-DF2004/PV-DF2004-K/PV-DF274/PV-DF2704/PV-DF2704-K
OK
Replace the Q8905 and Q8906
on the DVD Main C.B.A.
Replace the IC8001 on the
DVD Main C.B.A.
TROUBLESHOOTING HINTS