Ricoh D158 Service Manual page 279

No.
Definition
TD sensor error
The TD sensor outputs less
390 B
than 0.2 V or more than 4.0 V
10 times consecutively during
copying.
Development bias leak
391 B
A development bias leak
signal is detected.
TD sensor initial setting error
392 B
TD sensor initial setting is not
performed correctly.
D158/D159/D160/D161/D170
Symptom
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5-15
Service Call Conditions
Possible Cause
TD sensor abnormal
Poor connection of the PCU
Poor connection of the PCU
High voltage supply board
ID sensor
No developer
Drum does not turn
Development roller does not turn
Poor connection of the PCU
The voltage is not applied to charge
roller
SM