Ricoh MP 7503SP Field Service Manual page 474

4. Replacement and Adjustment
• Never leave the covers off during machine testing, or while the machine is idle during servicing.
• To avoid personal injury, always handle the PSU by its edges.
• Never touch the back of the board.
• Some of the soldered contacts are extremely sharp and can cut or puncture your fingers if you grip
the back of the board.
Here is a summary of the amount of residual voltage on the PSU condensers after the machine is
switched off and unplugged from the power source. The residual charge is designed to make the
machine recover faster from the Energy Save Mode.
100V PSU
Address
C9
C75
200V PSU
Address
C9
C27
472
Power Off 5 min.
308V 307V
146V 146V
Power Off 5 min.
287V 285V
287V 285V
10 min.
307V 304V
145V 144V
10 min.
284V 280V
284V 280V
1 hr.
1 hr.