Ricoh MP 7503SP Field Service Manual page 1273

• Check the drum harness, connector at the front of the machine
• Confirm that the drum unit is installed correctly
• Remove the drum unit and inspect the potential sensor
• Inspect the harnesses of the charge corona power pack
• Remove the charge corona unit and inspect the grid for damage, dirt,
• Replace potential sensor
• Replace charge corona power pack
• Replace drum quenching lamp
• Replace IOB
SC440-01 D
SC440-02 D
dust
Transfer output abnormal (voltage leak detected)
When the transfer voltage was output, the feedback voltage remained
higher than 4V for 60 ms.
• Transfer current terminal, transfer power pack disconnected, damaged
connector
• Transfer power pack defective
• Remove the transfer unit
• Inspect the terminals at the front and rear
• Replace transfer power pack
Transfer output abnormal release detection
When the transfer is output, there is hardly any feedback voltage within 60
ms even with application of 24% PWM.
• Transfer connector loose, defective
• Transfer unit harness disconnected
• Transfer power pack defective
• Remove transfer unit
• Inspect harnesses and connectors
• Replace transfer power pack
SC400: Image Development 2
1271