Troubleshooting - Denon DVD-3800 Service Manual

TROUBLESHOOTING

1. No power
(FL tube doesn't light.)
Check connector insertion.
Switching power (GU-3439-1):
[CX024, CX025, CX026, CY041,
CX141]
Main PWB (GU-3389):
[CX031, CX131, CX141, CX171,
CX272]
Check switching power (GU-3439-1)
voltages.
[CX141]: 14P PH for Main PWB:
, +5V, (3.3V)
5 "
(1) Check reset signal (3V) at 67pin of
IC601 on DISP PWB.
(2) Check 4.3MHz at 65pin of IC601.
Check switching power (GU-3439-1)
voltages.
[CX041]: 4P PH for Main PWB:
+3.6V
1
Check switching power (GU-3439-1)
voltages.
[CX141]: 14P PH for Main PWB:
+12V -12V +5V
1 2 3
3.3V +5V +3.3V
!
9
[CX041]: 4P PH for DISP PWB:
ON/ST(3.6V) -24V -29V
1 2 3
Perform operation check after
changing Main PWB (GU-3389) with
a perfect one.
Note: When switching power unit is repairable, refer to the waveforms and voltages shown in Schematic Diagram.
No
Re-insert the connector.
Replace the switching power
No
unit (GU-3439-1).
(1) Check R681, R602 solderring.
No
(2) After checking X601 and IC601
soldering, change X601.
If still NG after changing, replace
IC601.
No Check soldering of IC201 on Main PWB
(GU-3389).
No Replace the switching power unit
(GU-3439-1).
-32V
4
There is something wrong in Main PWB
No
(GU-3389).
→ Check 27MHz output of IC101 (49)
pin/XIN, (105) pin/CLK, and (116) pin/
PCLK2X on Main PWB.
When replacing µcom, µcom
peripheral parts, or Main PWB,
perform initializing of DVD player.
No Check after replacing IC201 on Main
PWB (GU-3389).
Check soldering of IC108, IC110 and
No
IC116 on Main PWB (GU-3389), then
change IC101 if it's NG. Change IC111 if
it's still NG.
A
DVD-3800
13