Olivetti ECR 8220, Service Manual

Page: 44 / 122

nDATA
HCLK
HLATCH#
STB2#
STB1#
nDATA
HCLK
HLATCH#
STB1#
STB2#
1A1
2
1A2
4
1A3
6
1A4
8
2A1
11
2A2
13
2A3
15
2A4
17
1G
1
2G
19
1Y1
18
1Y2
16
1Y3
14
1Y4
12
2Y1
9
2Y2
7
2Y3
5
2Y4
3
VC
C
20
GN
D
10
U14
TC74VHCT244FT
VCC5
C3
0.1uF
VFD_CS0#
VFD_TXD
VFD_CLK
VFD_CS0#
VFD_TXD
VFD_CLK
1
2
3
4
5
6
7
8
CN9
B8B-PH-K-S
-VPW
VF1
VF2
VCC
GND
CS0#
TXD
CLK
R139
1K
-Vpw
VF1
VF2
FB8
0(3216)
VCC5
+
EC6
10uF_16V
C
132
*3
30pF
C
131
*3
30pF
C129
*0.1uF
C
130
*3
30pF
A
K
D
7
*1SS355
A
K
D
6
*1SS355
A
K
D
5
*1SS355
VCC5
A
K
D1
0
*1
S
S
3
5
5
A
K
D9
*1
S
S
3
5
5
A
K
D8
*1
S
S
3
5
5
R
101
10K
R
100
10K
R9
9
1
0
K
VCC5
R79 33
R80 33
R81 33
FB9
0(3216)
R_VFD
+
EC17
*100uF_50V
C142 1000pF
C143 1000pF
VF
D
_
C
S
O#
VF
D
_
T
X
D
VF
D_
C
L
K
Trouble shooting
- Check the power supply of Display tube.
Check voltage (AC 3.9V) at point (7) on page 11.
If it outputs properly - - - Replace Customer Display Unit.
If it doesn’t output properly - - - Check Power supply circuit. (P.11)
Check voltage (DC -28V) at point (6) on page 11.
If it outputs properly - - - Replace Customer Display Unit.
If it doesn’t output properly - - - Check Power supply circuit. (P.11)
Check voltage (DC +5V) at point (1) on page 11.
If it outputs properly - - - Replace Customer Display Unit.
If it doesn’t output properly - - - Check Power supply circuit. (P.11)
Service Manual 44