Ricoh DD 4450 Service Manual page 217

Service Call Conditions
No.
E-51 Flash ROM error
Data cannot process correctly when the firmware is
downloaded or an original is stored in the machine.
E-52 Registration motor Drive IC error
If the Driver IC detects an over-current or overheating
condition, the machine outputs the FAULT signal.
If the FAULT signal is detected, this SC appears on the
display.
If the same SC repeatedly appears on the display, the
Driver IC may be damaged.
E-53 Paper feed motor
If the Driver IC detects an over-current or overheating
condition, the machine outputs the FAULT signal.
If the FAULT signal is detected, this SC appears on the
display.
If the same SC repeatedly appears on the display, the
Driver IC may be damaged.
E-54 Ri2000A Configuration error
Turn on the Main switch, come out of Enegry Saving
E-55 GATC2 (FPGA) Configuration error
E-56 GATC2 (FPGA) Configuration writing error
E-61 Auto Off Switch error
The main switch does not turn off for more than 6.0
seconds.
E-70 DF Gate network error
10 seconds have passed since the original moved from
the registration position, but the DF gate signal has not
turned on.
Note: DF gate has nothing to do with the DF (document
feeder)
C279
Symptom
6
Possible cause
Flash ROM (MPU)
Registration motor
MPU
Paper feed motor
MPU
MPU
MPU
MPU
*See: Error Code
(Display:E42)
Auto off switch
Auto off switch
connector disconnected
Network
SM Appendix