Ricoh D129 - Page 508

Service Call Conditions
SM 6-19 D129/D130
Trouble-
shooting
553 A
Fusing overheat error 1 (software detection)
A fusing temperature (at the end) of over 230°C (446°F) is detected for 1
second by the fusing thermistors at the center or at either end of the fusing
roller.
 Power supply unit defective
 I/O board (IOB) defective
 BCU defective
 TRIAC short on PSU (PSU defective)
554 A
Fusing overheat error 1 (hardware detection)
A fusing temperature (at the end) over 250°C is detected by the fusing
temperature monitor circuit in the BCU board.
 I/O board (IOB) defective
 BCU defective
555 A
Fusing lamp consecutive full power 1
After warm-up, the fusing lamp remains at full power for 40 seconds without
the hot roller rotating.
 Disconnected or defective thermistors (ends)
 Defective fusing lamp
557 C
Zero cross frequency error
When the zero cross signal is 66 or more and it is detected 10 times or more
in 11 detections, the machine determines that input 60 Hz and SC557
occurs.
 Noise (High frequency)