Olivetti ECR 7900 Service Manual page 103

1 2
D
Printer Power (+7.5V)
CN10
1
2
3
4
5
6
7
8 Logic Power (+5.0V)
9
10
11
12
13
14
15
B15B-PH-K-S
VFD Drive Power (-28V)
VFD Filament Power (3.9V P-P)
C
R197
PF_IN
5.6K_F
R198
1.2K_F
B
VBB
U9 BD5230G
1 5
VO CT
2
VDD
3 4
C105
GND NC
0.1uF_25V C108
4700pF (29ms delay )
A
1 2
Y108540-8 ECR 7900 Service Manual
3
HVPSW
HVPSW
TP5
+24V
+24V
(+32V)
EC14
TP6
+
VPRN
10uF_50V
VPRN
EC15
+
100uF_16V
PG
TP7
VCC
R185
VCC
*0_1W
EC16
TP8
+
GND
100uF_16V
EC17
TP9
+
-Vpw
*10uF_50V
-Vpw
TP10
VF1
VF1
TP11
VF2
VF2
VCC
C104
0.1uF_25V
R192
1K
U10
1 8
NC NC
2 7
IN VCC
3 6 PF#
NC OUT PF#
4 5
GND C
C106
M51957BFP
Power Fail
1000pF
C107
*0.1uF_25V
VBB
R196
1k
RESET#
RESET#
RESET
3
4 5
VCC
Q4
2SA1036K
E C
ZD1 R184
RD3.3EB1
2K
+
R189
EC20
39
33uF_16V
R190
750 Q9
B
2SC2412K
R191
C114
62
1uF_10V
DRW_ON
DRW_ON
BUZZER
BUZZER
* mark is unmounted parts.
4 5
97
6 7
TP4
VBB
VBB
Battery Back-up Power
+
EC13
33uF_16V
D83
RB520S- 30
R205
SVBT
SVBT
100K_F
R206 C113
1000pF
680K_F
CN11
2
Battery (AA[1.5V] x 3)
1
B2B-XH- A
+24V
F1 CN12
1
Drawer Interface
2
JUMPER 3
D85
B3P-SHF-1AA
1SR154-400
R186
B Q5
2SD986
4.7k
R188
10k
PG
R193 R194
VCC
4.7K 10K
BZ1
B
Q8
2SA1036K
PS1740P02
R195
-Vpw
4.7K
Buzzer
6 7
8
D
C
B
A
8