22
BDP-120
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5. DIAGNOSIS
5.1 DIAGNOSIS FLOWCHART
The main PWB circuit doesn't function when the power is turned ON.
The power does not become O
N
.
Is the level of pin (6) of SC9001 at Low?
The power becomes OFF.
Check the peripheral circuits
of IC2503.
Check the
IC9001, 9002, 9003, and their
peripheral circuits.
YES
N
O
N
O
N
O
Is the fan turning on when the power
is turned O
N
?
Check the fan, fan power and their
peripheral circuits.
YES
YES
N
O
YES
YES
FLOW CHART No.1
N
O
Are AT_12
V
,SUB_PC-
8V
supplied to
SC9001?
Check the POWER PWB Unit.
YES
N
O
Is 1.05
V
supplied to TL9016 3.3
V
to
TL9017, 1.
8V
to TL 901
8
respectively?
Check the IC9001, 9002, 9003 and their
peripheral circuits.
YES
N
O
Is 27MHz detected at R7260?
Check X7201 and its peripheral circuits.
YES
N
O
Does pin (1) of C
N
7205 turn to High and
Low on start-up?
Check IC7
8
02, IC7
8
03, IC7
8
04, IC7
8
05,
IC
8
502, IC
8
505 and their peripheral
circuits.
Check IC7201 and its peripheral circuits.
The drive doesn't function normally.
Check DRI
V
E_12
V
of Q9014, DRI
V
E_5
V
of Q9012 and their
peripheral circuits.
N
O
Check IC9006 and its peripheral circuits.
N
O
Are DRI
V
E 1.5
V
to IC7201?
Check IC9005 and its periphral circuits.
N
O
YES
Check the drive.
[1] MAIN PWB Unit
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
