Service manual

8 7 6 5 4
3
2 1
A B
C D
12345678
D C
B A
11/12
RS232C CONNECTOR (RSCN1)
/CS SD /RS RD /DR /CD
/CI
/ER
/CS
SD
5 9 4 8 3 7 2 6 1
RSCN1
DSUB9
+5V
/CD /DR RD /RS SD /CS
/CD
1
/DR
2
RD
3
/RS
4
SD
5
/CS
6
/ER
7
/CI
8
+5V
9
GND
10
CN21
RS CN
/CD
1
/DR
2
RD
3
/RS
4
SD
5
/CS
6
/ER
7
/CI
8
5V
9
GND
10
DRCN1
+5V
C251
0.1U
/RSS /ERS
TXD /CDS
RXD /RI
/DRS /CSS
2-2C
2-2C
2-2B
2-2B
2-2B
2-2B
2-2B 2-2B
C1+
12
C1-
14
C2+
15
C2-
16
V+
13
V-
17
T1IN
7
T2IN
6
T3IN
20
T4IN
21
R1OUT
8
R2OUT
5
R3OUT
26
R4OUT
22
R5OUT
19
/EN
24
T1OUT
2
T2OUT
3
T3OUT
1
T4OUT
28
R1IN
9
R2IN
4
R3IN
27
R4IN
23
R5IN
18
/SHDN
25
V C C
1 1
1 0
1 0
IC27
MAX211
C252 0.1U
C253
0.1U
C255 0.1U
C254 0.1U
R334
R335 R336 R337 R338
100X5
/ER /CI
FB1 FB2 FB3
FB4 FB5 FB6 FB7 FB8
ICP
O OHM
/RS /ER SD
RD /CD /CI /DR /CS
+5V /CI /ER
/RS
RD /DR /CD
C247 C248 C249 C250
1000PX5
C246