Ricoh LI-MF1 M126, Field Service Manual

Page: 236 / 324

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
Controller board service check
FRU Action
Controller board assembly
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 ( p.236
"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 ( p.245 "Operator Panel Service
Check")
6. Troubleshooting
234
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