IBM 3112 Service Manual page 123

Engine Board Connectors
Connector
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
Name
Operator Panel/Output Bin Sensor
Printhead Mirror Motor/Fan
Duplex
LVPS
Reserved
Paper Drive Motor
Board-to-Board Connector (Rip Board/Engine Board)
Exit/Paper Size Sensor/Fuser Solenoid
Input/Toner Sensor Board/Erase Lamps
Envelope Feeder Magnet
Printhead Hsync
Printhead Laser
HVPS
Paper Feed Magnet
500 Sheet Feed Option
Connector Locations
107