Ricoh MP 7503SP Field Service Manual page 1144

5. Detailed Descriptions
The AC Drive board distributes AC power to the PSU, and also distributes power to the fusing unit and
anti-condensation heaters. This board also holds the protection circuits for the PSU.
AC Drive Board Fuses for M223/M224
Fuse
FU101
FU102
FU103
FU105
AC Drive Board Fuses for M225
Fuse
FU101
FU102
FU103
FU105
FU106
LDB. This is the laser drive board that holds the laser diode (LD) that creates images on the drum.
Power Packs. Supplies the voltage requested by process control to perform adjustments for conditions
around the drum. There are three powers packs. The transfer coronal power pack applies charge to the
drum, the development power pack supplies the bias charge to the development unit, and the transfer
power pack supplies the charge for the transfer unit to transfer the image from drum to paper (and also
for paper separation from transfer belt).
Operation panel boards. For more information about the operation opanel boards, please refer to
"Smart Operation Panel Second Generation" manual.
1142
Rating
15A/250V SC547-02
15A/250V Machine does not boot.
15A/250V No SP display, no abnormal operation
2A/250V Machine does not operate after more than 30 sec. have
elapsed at machine start up, or while the fusing unit is cooling
(recovery).
Rating: 100V
15A/250V SC547-02
15A/250V No power code display. (SC log 581-00)
15A/250V No SP display, no abnormal operation
15A/250V No power code display. (SC log 581-00)
15A/250V Machine does not boot.
Blown Fuse
Blown Fuse