Service Checks; Controller Board Service Check - Ricoh LI-MF1 M126 Field Service Manual

6. Troubleshooting

Service Checks

• Service checks which involve measuring voltages on the LVPS/HVPS (low voltage power supply/
high voltage power supply board) should be performed with the machine positioned on its back
side.
• When making voltage readings, always use frame ground unless another ground is specified. See
the wiring diagram for more information.
• The controller board is located beneath the flatbed. To access the controller board, see "ADF Unit
Removal" in "Replacement and Adjustment".

Controller Board Service Check

6
Controller board service check
FRU
Controller board assembly
234
POST (Power-On Self Test)
• The machine should complete POST in approximately 45
seconds.
• If the machine fails to display lights or activate the drive motor,
fuser, or fan, then check the following order:
1. Power to the LVPS/HVPS.
2. Power from the LVPS/HVPS to the engine board (
"Engine Board Service Check")
3. Power from the engine board to the controller board.
4. Cables are plugged in correctly, especially for the operator
panel. The machine will not power-up without a functioning
operator panel.
5. The operator panel (
Check")
Action
p.245 "Operator Panel Service
p.236