Symptom:
When the I/O PCB is connected, the Scanner spins extremely fast when power is
turned on.
Background Information:
Occasionally the Scanner will spin very fast, even if the I/O board is not
connected. Usually when this happens the DC Controller board or the Scanner
assembly is defective. In this particular case, when the I/O board is installed
and the shield connects to ground, the Scanner spins very fast.
Cure:
To confirm this problem, pull out the I/O PCB and Power On. If it runs
normally, turn the printer off, install a plug on J209 of the DC Controller
board or use a clip and connect the 2 pins of J209 together (J209 connects
signal ground to frame ground); then turn the printer on. If the Scanner spins
very fast then replace Scanner harness cable.