Gestetner B003 Service Manual page 191

Code No.
391 C TD sensor error: Auto adjust error
During automatic adjustment of the TD
sensor, output voltage is less than 1.8V
or more than 4.8V during TD sensor
initial setting.
395 C Development output abnormal
A development bias leak signal is
detected. High voltage output to the
development unit exceeded the upper
limit (65%) for 60 ms.
401 C Transfer roller leak detected
A transfer roller current leak signal is
detected.
402 C Transfer roller open error
The transfer roller current feedback
signal is not detected.
403 C Transfer belt position sensor error
The transfer belt position sensor does
not activate even if the transfer belt
contact clutch has been switched on
twice and rotated once.
405 C Transfer belt error
The transfer belt does not move away
from the drum during ID sensor pattern
checking.
440 C Main motor lock
A main motor lock signal is not detected
within 2 seconds after the main motor
turns on.
490 C Exhaust fan motor lock
An exhaust fan motor lock signal is not
detected within 5 seconds after the
exhaust fan motor turns on.
492 C Cooling fan motor lock
A cooling fan motor lock signal is not
detected within 5 seconds after the
cooling fan motor turns on.
SM
Symptom
4-5
SERVICE CALL CONDITIONS
Possible Cause
TD sensor abnormal
TD sensor disconnected
Poor TD sensor connection
I/O Board (IOB) defective
Toner supply defective
High voltage supply board defective
Poor connection at the development
bias terminal
Poor connection at the high voltage
supply board
High voltage supply board defective
Poor cable connection or defective
cable
Transfer connector defective
High voltage supply board defective
Transfer connector cable defective
Transfer connector defective
Poor PCU connection
Main motor/drive malfunction
Transfer belt contact clutch defective
Harness disconnected
Main motor/drive malfunction
Transfer belt position sensor defective
Poor transfer belt position sensor
connection
Too much load on the drive mechanism
Main motor defective
Too much load on the drive mechanism
Exhaust fan motor defective or a loose
object is interfering with the fan
Poor fan motor connector connection
Too much load on the drive mechanism
Cooling fan motor defective or a loose
object is interfering with the fan
Poor fan motor connector connection
B003/B004/B006/B007