Ricoh D158 Service Manual page 286

Service Call Conditions
No.
Definition
Zero cross signal malfunction(D158/D159)
Zero cross signals are
detected three consecutive
times at 50 ms intervals.
547
B
This error is detected before
-01
the fusing relay is turned on
after turning on the main
power or closing all the
doors.
Zero cross signal malfunction (D158/D159)
The zero cross signal is not
detected for 3 seconds even
547
B
though the fusing relay is on
-02
after turning on the main
power or closing all the
doors.
Zero cross signal malfunction(D158/D159)
A detection error occurs
twice or more in 11
547
B
frequency detections. This
-03
error is defined when the
detected zero cross signal is
less than 45.
Zero cross signal malfunction (D160/D161/D170)
547 B
Detecting low-frequency
wave
D158/D159/D160/D161/D170
Symptom
5-22
Possible Cause

Defective fusing relay

Defective fusing relay circuit

Defective PSU

Power supply board

Defective fusing relay

Defective fusing relay circuit

Defective PSU

Power supply board

Defective fusing relay

Defective fusing relay circuit

Defective PSU

Power supply board

Defective PSU

Defective BICU
SM