Ricoh D158 - Page 287

Service Call Conditions
D158/D159/D160/D161/D170 5-23 SM
Trouble-
shooting
No.
Definition
Symptom Possible Cause
551 A
Fusing thermistor open (rear)
The fusing temperature is
below 0°C for 5 seconds
(detected by the thermistor).

Fusing thermistor defective or out of
position
 Loose connectors
552
-01
A
Fusing temperature warm-up error (rear) (D158/D159)
The fusing temperature
rises less than 4 degrees in
2 seconds, and this
continues 5 times
consecutively.

Fusing thermistor defective or out of
position
 Power supply board
552
-03
A
Fusing temperature warm-up error (rear) (D158/D159)
The fusing temperature
does not reach the target
with in 28 seconds after the
fusing lamp controller is
activated.
 Broken fusing lamp cables
552 A
Fusing reload failed (rear) (D160/D161/D170)
NOT reaching the reload
temperature in 20 ms after
starting fusing lamp control.
 Defective thermistor
 Disconnection of fusing lamp
553 A
Fusing overheat error (rear)
The fusing temperature is
over 230°C for 1 second
(detected by the thermistor).
 Fusing thermistor
 Power supply board
554 A
Heating roller fusing lamp overheat 2 (hardware error) (D158/D159)
-
 The triac has shorted out.
 Defective BICU
 Defective fusing control system