36
DJM-850-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5.7 V+34D DIAGNOSIS
!
!
100u/50
C1416
100u/25
C1403
C 1 4 0 5
1 0 0 p / 5 0
C H
C1404
10u/35
CCG1236-A
C1414
N
M
C1417
1000p/50
CH
C 1 4 1 2
N
M
C1454
0.1u/25
SR
C1455
1000p/50
CH
C1461
0.1u/50
SR
D 1 4 0 3
R B 1 6 0 L - 4 0
G
N
D D
G
N
D D
G
N
D D _ 3 4 D
G
N
D D
G
N
D D
N
J M 2 3 9 2 M
I C 1 4 0 3
C S
1
E S
2
C T
3
G
N
D
4
5
I
N
-
6
V
+
7
S I
8
C D
L 1 4 0 1
D T L 1 1 2 3 - A
4 7 0 u H
L T C 1 2 4 E U B
Q 1 4 0 1
L T C 1 2 4 E U B
Q 1 4 0 5
L T A 1 2 4 E U B
Q 1 4 0 6
Q 1 4 0 4
L S C 4 0
8
1 U B ( Q R S )
Q 1 4 0 3
L S C 4 0
8
1 U B ( Q R S )
L S A 1 5 7 6 U B ( Q R S )
Q 1 4 0 2
R1424
15k
R1407
39k
SR (D)
R 1 4 0 6
N
M
R 1 4 0 3
1 . 5 k
S R
R140
8
1.5k
SR (D)
R1404
1.5
SQ
R141
8
47k
R1405
1.5
SQ
R1423
15k
R1414
100k
R1422
15k
R 1 4 1 6
2 . 2 k
R1425
15k
R1417
47k
R1421
15k
R1415
1
8
k
SR
V
+ 5 A
V
+ 3 4 D
V
+ 3 4 D _ 1
V
+ 1 3 D _ U
N
R E G
V
+ 3 4 D _ C O
N
T
1 0 : 1 2 K
13
V
34
V
(FL)
S T B Y
S T B Y
A s i d e
A s i d e
From MAI
N
_UCOM
V
+34D
Discharge circuit
V
+34C_CO
N
T
High
Low
The driver power output for the FL (
V
+34D) is controlled with a transistor switch.
Diagnostic procedures when only V+34D is not output
1
Check
V
+34D_1 at the prior stage of the transistor (Q1402).
2
If no signal is detected at
V
+34D_1, the mounting status of the peripheral parts of the 34
V
DC/DC converter
(IC1403) may be improper or IC1403 itself may be defective.
3
If a signal is detected at
V
+34D_1, check the Q1405 and Q1406.
If
V
+34D_CO
N
T is L, the mounting status of the MAI
N
UCOM (IC2
8
03) may be improper or IC2
8
03 itself may be
defective.
If
V
+5A is 0
V
, confirm an output of IC5001 of REG Assy and connection state.
4
If both
V
+34D_CO
N
T and
V
+5A are H:
If the output signal from Q1406 is L, the mounting status of Q1406 may be improper or Q1406 itself may be defective.
5
W
hen the above does not have any problem, the following problems are thought about.
1. The mounting status of the peripheral parts of Q1401 or Q1402 may be improper or Q1401/Q1402 may be defective.
2. The mounting status of the peripheral parts of Q1403 or Q1404 may be improper or Q1403/Q1404 may be defective.
2
5
1
5
4
3
3
3
D
MAIN ASSY