、
、
Power on
If it has +5V output
If it has +3.3V output
If it has –12V output
If it has +12V output
If the other has +5V
output
If it has +3.5V between
D+ and D-
If it has –24V output
The power supply work normally
Check
DZ1(4V7
regulator),
D1(31DQ04) and peripheral circuit
Check D2 D3 and peripheral
circuit
Check DZ2 D5 RF1( especially
RF1) and peripheral circuit
Check DZ3 DZ4 D6 and peripheral
circuit
Check DZ5 D7 D8 and peripheral
circuit
Check DZ7 R23 R24 D10
and peripheral circuit
Check DZ6 D11 and peripheral
circuit
Exchange transformer
If transformer has output
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Figure
9
、
Power
supply board troubleshooting schematic diagram
Ⅵ
.
Maintenance Example:
（
1
）
One BSA-3800R player with nothing displays on LCD screen, check the
power-supply part and find there is no –24V voltage output. Then find D11 is invalid,
exchange it.
（
2
）
One BSA-3800R player loading a disc with 5.1 CH, find there is no sound from
surround left, and surround right. Then find the sound signal is normal before amplified
by RC4558, so can confirm that RC4558 is invalid, exchange it.
（
3
）
One BSA-3800R player is found that there is no audio output from 5.1 CH, find it
is still has no sound before amplified by RC4558, so exchange PCM1606 DAC.
（
4
）
One BSA-3800R player neither has sound from 5.1 CH, nor –12V voltage output,
then check to find RF1 10
Ω
safety resistance is invalid, exchange it.
（
5
）
One BSA-3800R player switch to different video output, when it is connecting with
SCART TV. For example: after S-VIDEO system switch to Y /PB/PR system, TV can
not switch automatically to AV input. Check and find there is one audion among four
audions is invalid, exchange it.
（
6
）
One BSA-3800R player cannot display picture after turning on. Check and find
there is no +5V, 3.3V voltage output from power supply board, and find there is no
