Service manual
AI8
15
SN75124N (XE737A00)
Triple Line Receiver
IPC3: IC300
SN75121 (XE638A00)
Dual Line Driver
IPC3: IC301
1A
1B
2R
2S
2A
2B
2Y
GND
1 16
2 15
3 14
4 13
5 12
6 11
7 10
8 9
Vcc
1S
1R
1Y
3A
3S
3R
3Y
Vcc
2F
2E
2A
2Y
GND
1Y
2C
2B
2D
1A
1B
1C
1D
1E
1F
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CIRCUIT BOARDS CONTENTS
AC Circuit Board (XW293B0)····················································································· 16
DC Circuit Board (XW293B0)····················································································· 19
DR Circuit Board (XW293B0)····················································································· 16
IFC2 Circuit Board (XW283B0) ·················································································· 20
IPC1 Circuit Board (XW285A0)·················································································· 17
IPC3 Circuit Board (XW286B0)·················································································· 16
LED1 Circuit Board (XW286B0)················································································· 16
MB1 Circuit Board (XW282A0) ·················································································· 19
PSB Circuit Board (XW293B0) ·················································································· 16
UNC Circuit Board (XW281B0) ·················································································· 18
Note: See parts list for details of circuit board component parts.