Ricoh D009 Service Manual page 246

SC Tables: SC5xx -2
Fusing lamp consecutive full power 1
After warm-up the fusing lamp remains at full power for 15 seconds without
545 A
the hot roller rotating.
Disconnected or defective thermistors (center)
Defective fusing lamp
Fusing thermistor open (end)
The thermistor (end) detects 0°C or less for 5 sec.
551 A
Fusing thermistor (end) disconnected
Fusing thermistor (end) connector defective
Fusing temperature warm-up error (end)
This SC is generated if the following condition occurs:
The thermistor (end) does not detect an 8°C increment in the fusing
552 A
temperature for 7.5 sec. just after the fusing temperature reached 45 °C.
The temperature of the end thermistor does not reach the target
temperature for 31 seconds after the fusing lamps turned on.
Thermistor warped or broken
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.
553 A
Power supply unit defective
I/O board (IOB) defective
BICU defective
TRIAC short on PSU (PSU defective)
D009/D011/D012/D013 4-20 SM