SERVICE CALL CONDITIONS
B135/B138 4-6 SM
Code No. Symptom Possible Cause
TD sensor error: Test value abnormal 390 C
The TD sensor output voltage is less
than 0.5V or more than 5.0V after 10
consecutive times during copying.
• TD sensor defective
• TD sensor not connected or
connector damaged
• Poor connection between the TD
sensor and the I/O board (IOB)
• I/O board (IOB) defective
• Toner supply defective
TD sensor error: Auto adjust error 391 C
During automatic adjustment of the TD
sensor, output voltage is less than 1.8V
or more than 4.8V during TD sensor
initial setting.
• TD sensor abnormal
• TD sensor disconnected
• Poor TD sensor connection
• I/O Board (IOB) defective
• Toner supply defective
Development output abnormal 395 C
A development bias leak signal is
detected. High voltage output to the
development unit exceeded the upper
limit (65%) for 60 ms.
• High voltage supply board defective
• Poor connection at the development
bias terminal
• Poor connection at the high voltage
supply board
Transfer roller leak detected 401 C
A transfer roller current leak signal is
detected.
• High voltage supply board defective
• Poor cable connection or defective
cable
• Transfer connector defective
Transfer roller open error 402 C
The transfer roller current feedback
signal is not detected.
• High voltage supply board defective
• Transfer connector cable defective
• Transfer connector defective
• Poor PCU connection
Transfer belt position sensor error 403 C
The transfer belt position sensor does
not activate even if the transfer belt
contact clutch has been switched on
twice and rotated once.
• Main motor/drive malfunction
• Transfer belt contact clutch defective
• Harness disconnected
Transfer belt error 405 C
The transfer belt does not move away
from the drum during ID sensor pattern
checking.
• Main motor/drive malfunction
• Transfer belt position sensor
defective
• Poor transfer belt position sensor
connection
Main motor lock 440 C
A main motor lock signal is not detected
within 2 seconds after the main motor
turns on.
• Too much load on the drive
mechanism
• Main motor defective
450 Feed Development Motor Error
C
The PLL lock signal remains LOW for 2
s while the feed development motor is
operating.
• Motor lock caused by overload.
• Motor driver defective.
Exhaust fan motor lock 490 C
An exhaust fan motor lock signal is not
detected within 5 seconds after the
exhaust fan motor turns on.
• 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
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