Olivetti ECR 7900, Руководство по обслуживанию

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30 ECR 7900 Service Manual Y108540-8
3-7. DISPLAY CIRCUIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CN11
C03-20AG1 10 x 2 (MALE)
FB6
0(3216)
FB7
0(3216)
R36
0
VCC5
C22
0.1uF
+
EC10
100uF_16V
LC_CD#
LC_RD#
LC_RST#
LC_WR#
LC_D0
LC_D1
LC_D2
LC_D3
LC_D4
LC_D5
LC_D6
LC_D7
LC_CE#
LC_LEDA
C
128
10
0pF
C1
2
7
10
0pF
C
126
10
0pF
C1
2
5
10
0pF
C
124
10
0pF
C1
2
3
10
0pF
C
115
10
0pF
C1
2
2
10
0pF
C
121
10
0pF
C1
2
0
10
0pF
C
119
10
0pF
C1
1
8
10
0pF
C
117
10
0pF
C1
1
6
10
0pF
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
A8
9
G
19
DIR
1
B1
18
B2
17
B3
16
B4
15
B5
14
B6
13
B7
12
B8
11
VC
C
20
GN
D
10
1
0
U11
SN74LV245APWR
R66 33
R67 33
R68 33
R69 33
R70 33
R71 33
R72 33
R73 33
R74 33
R75 33
R76 33
R77 33
R78 33
C20
0.1uF
C23
0.1uF
VCC3
VCC3
D0
D1
D2
D3
D4
D5
D6
D7
RD#
A0
LCD_RST#
WR#
LCD_CS#
B
E
C
Q6
DTC143EKA
B
E C
Q7
2SA1036K
R168
2K
VCC5
R98
10K
BKL_ON
RD#
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
A8
9
G1
1
G2
19
Y1
18
Y2
17
Y3
16
Y4
15
Y5
14
Y6
13
Y7
12
Y8
11
VC
C
20
GN
D
10
U12
SN74LV541APWR
C55
*1000pF
LC
D
M
o
du
le
C21
0.1uF
C24
0.1uF
3
1 2
A
K K
ZD1
*H
Z
M
6.
2M
WA
T
R
-E
3
1 2
A
K K
ZD2
*H
Z
M
6.
2M
WA
T
R
-E
3
1 2
A
K K
ZD3
*H
Z
M
6.
2M
WA
T
R
-E
3
1 2
A
K K
ZD4
*H
Z
M
6.
2M
WA
T
R
-E
3
1 2
A
K K
ZD5
*H
Z
M
6.
2M
WA
T
R
-E
3
1 2
A
K K
ZD6
*H
Z
M
6.
2M
WA
T
R
-E
C114
0
.1
u
F
_f
ilm
10x2 Box-Header(P=2.54mm)
R
1
98
10
K
R
1
97
10
K
R
1
96
10
K
R
1
95
10
K
R
1
94
10
K
R
1
93
10
K
R
1
92
10
K
R
1
91
10
K
Trouble shooting
- No display but backlight turns on
- - Replace LCD unit or Main board.
- Display OK, but backlight does not turn on.
Check voltage at point (2)
DC +5V - - - Replace LCD unit.
DC 0V - - - Replace Main board.
- No display and no backlight.
Check voltage at point (1)
DC +5V - - - Replace LCD unit or Main board.
DC 0V - - - Check Power supply circuit. (P.9-11)
(1)
(2)