Ricoh B051 Service Manual page 176

SERVICE CALL
No.
Definition
280 D Image transfer belt mark detection error
• An imaging process starts. → No
belt mark is detected within 1
revolution.
• A color imaging process starts. →
A mono color image is transferred.
→ FGATE becomes active. → No
belt mark is detected within 1
revolution.
• Thick paper or OHP film is used. →
The belt slows down. → No belt
mark is detected within 1
revolution.
282 D GAVD communication error
Data is transferred. → The CPU does
not detect the communication signal
from GAVD.
300 D Charge corona unit electrical leak
The supply to the charge corona unit
is continuously output, and the unit is
operating at the minimum PWM duty
value. → 4.5 Volts (or more) returns
for 60 milliseconds.
301 D Charge corona unit disconnection
The supply to the charge corona unit
is continuously output. → The unit
operates at the maximum PWM duty
value for 60 milliseconds.
302 D Charge grid electrical leak
The supply to the charge grid is
continuously output. → The returning
voltage exceeds the target by 0.5 Volt
or more for 120 milliseconds.
305 D Charge corona unit cleaner error
• Cleaning starts. → The lock signal
is not detected within 30 seconds.
• Cleaning starts. → The cleaner
starts to turn. → The lock signal is
detected within 6 seconds.
• The lock signal is detected while
the unit is moving away from the
home position. → The next lock
signal is detected within 6 seconds
after the unit has turned toward the
home position.
350 D Development error 1 (K/Y)
A development process starts. → The
returning voltage exceeds the target
by 0.5 Volt or more for 60
milliseconds.
B051/B052
CÓPIA NÃO CONTROLADA
Symptom
4-4
CÓPIA NÃO CONTROLADA
Possible Cause
• Defective BICU
• Poor electrical connection between
sensor and BICU
• Defective BICU
• Short circuit in the charge corona unit
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
• Defective PCU installation (OPC belt)
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
• Defective PCU installation (OPC belt)
• Short circuit in the charge grid
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
• Defective PCU installation (OPC belt)
• Defective cleaner
• Incorrect charge corona unit installation
• Toner fallen into the cleaner drive
mechanism
• Short circuit in the development unit
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
SM