5.3 Motherboard
A: LED, 24 V K: LED, 5 V Magnet racks
B: LED, 5 V L: Connectors, Magnet racks
C: LED, -12 V M: EPROM socket
D: LED, +12 V N: Connector, Paper Out sensor
E: LED, -12 V Serial port O: Connector, Paper Feed sensors
F: LED, +12 V Serial port P: Connector, Main sensor
G: Serial port Q: Connector, Stepping Motor
H: LED, 5 V Parallel port R: Connector, Relays
I: Parallel port S: Power supply input
J: Connector, Operator Panel