22
ECR 7900 Service Manual
Y108540-8
POWER SUPPLY CIRCUIT continued
Trouble shooting
- STEP 1
Check the voltage (DC +5.0V) at point (1).
If it does not output properly - - - Check FUSE F2 & F3 continuity and replace it if OPEN.
Check the voltage (DC +3.3V) at point (2).
If it does not output properly - - - Check FUSE F2 & F3 continuity and replace it if OPEN.
Check the voltage (DC +3.3V) at point (2).
If it does not output properly - - - Check FUSE F2 & F3 continuity and replace it if OPEN.
Check the voltage (DC + 7.6V) at point (4).
If it does not output properly- - - Check FUSE F1&F2 continuity and replace it if OPEN.
Check the voltage (DC +24V) at point (5).
If it does not output properly- - - Check FUSE F1 continuity and replace it if OPEN.
Check the voltage (DC -28V) at point (6).
If it does not output properly- - - Check FUSE F5 continuity and replace it if OPEN.
Check the voltage (AC 3.9V) at point (7).
If it does not output properly- - - Check FUSE F4 continuity and replace it if OPEN.
- STEP 2
After replacing FUSE at STEP 1 but the FUSE opens again.- - - Replace Main board.
No voltage at all the points from (1) to (7). - - - Replace Transformer.
1
2
3
4
5
6
7
CN12
B7P-SHF-1AA
F2
MRT 3.15A
F5
TR-5 19370 0.5A
F4
TR-5 19370 1A
A
K
D4
1SR154-400
B
E
C
Q12
2SA1284D
+
EC13
100uF_63V
R103
10K
R174
3.3K
A
K
ZD8
RD30EB3
R104
10K
SC
1
SE
2
Co
3
GND
4
Vref
5
Vin
6
Ipek
7
Qo
8
U9
M5291FP
A
K
D3
1SR154-400
R175
1.1K_F
R176
3.6K_F
C138
330pF
R177
300_1W
B
E
C
Q11
2SB1455R
L1
SF-T8-40S-PF
+
EC16
1000uF_16V
VCC5
R131
100
B
E
C
Q10
2SD1415A
A
K
ZD7
RD9.1EB2
HT1
GOT-4540-SPL
+
EC11
100uF_16V
VPRN
R140
1K
(+7.6V)
-Vpw
R184
0(3225)
VF1
R181
470
R182
470
A
K
ZD9
RD5.6EB1
C139
0.1uF_50V
R183
56K
TP10
VS
R185
VF2
TP12
VF2
TP13
VF1
TP6
-Vpw
C26
0.1uF
C27
0.1uF
+
EC12
100uF_16V
VCC3
+
EC15
100uF_50V
A
K
D12
EC31QS06
A
K
D13
EC31QS06
VBB
GN
D
FIN
N.C.
3
Vout
4
ADJ
5
Vin
2
CTL
1
U15
BA00CC0WFP
R178
4.3K_F
R179
2.2K_F
PG
R180
*3.9K_F
PG
A
K
D11
EC31QS06
F3
TR-5 19370 1.6A
+
EC14
15
000u
F
_2
5
V
+
EC7
10uF_16V
+
EC
10
FB11
EXCELSA35
FB10
EXCELSA35
L
P
N
M
-
+
DB1
RS402
C25
0.1uF
B
E
C
Q8
2SA1036K
R169
2.2K
R102
10K
R136
4.7K
HVPSW
F1
TR-5 19370 1.6A
VDRW
Vin1
TP7
VCC5
TP8
VCC3
TP9
VBB
TP5
Vin1
TP3
VPRN
TP2
VDRW
B
E
C
Q9
DTC143EKA
GN1
GND-ONE_POINT
C136
*ERZV05D390
C137
0.01uF_film
A
K
D15
1SR154-400
+
EC18
470uF_50V
R199
10K
(3)
(2)
(1)
(4)
(5)
(6)
(7)
Содержание ECR 7900
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Страница 45: ...Y108540 8 ECR 7900 Service Manual 39 S RAM PIN Configuration Refer to the specification attached data sheet...
Страница 47: ...Y108540 8 ECR 7900 Service Manual 41 FROM PIN Configuration Refer to the specification attached data sheet...
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Страница 70: ...64 ECR 7900 Service Manual Y108540 8 17 It shows Up Load OK 18 Click Ver button...
Страница 76: ...70 ECR 7900 Service Manual Y108540 8 12 Click the HardWare tab 13 Click the Device Manager...
Страница 107: ...Y108540 8 ECR 7900 Service Manual 101 9 EXPLODED DIAGRAM...