Ipu Board; Dip Switches; Led's - Ricoh A109 Service Manual

4.2 IPU BOARD

4.2.1 DIP Switches

SW300-1: Selects the accuracy level of synchronizing the video signal
clock (18.6 MHz) with the laser synchronizing signal.
OFF: 1/15 clock
SW300-2: Factory use only (MUST BE OFF, otherwise entire background
appears dirty.)
SW300-3, -4, -5:
Factory use only (NORMALLY OFF)

4.2.2 LED's

LED300 ∼ 307: IPU-CPU monitor
If all the LED's blink together, the Main-CPU and the IPU-CPU
have a communication error. → SC code appears.
LED308: Laser synchronizing signal monitor
LED309: Monitor for the combination of SW300-3, 4, 5.
A109
ON: 1/4 clock
4-46
(MUST BE ON)
FSM