Ricoh B064 - Page 373

B140 SERIES AND G126 SERVICE MODE
SM 4-49 B064 Series/B140 Series/G126
Trouble-
shooting
SC No. Symptom Possible Cause
One of the following occurred:
• After power on, or after closing
the front door, the hot roller does
not reach the 100°C control
temperature within 25 s.
• 5 sec. after temperature rise
started, temperature remained
below 21°C after 5 samplings.
• Fusing unit did not attain reload
temperature within 48 sec. of the
start of fusing temperature
control.
• Fusing lamp disconnected
• Thermistor warped, out of position
• Thermostat not operating
Fusing lamp overheat error 1 (software) 543 A
Central thermistor detected a
temperature of 240°C at the center
of the hot roller. Fusing temperature
control software error
• PSU defective
• IOB defective
• BICU defective
Fusing lamp overheat error 1 (hardware) 544 A
Either the central thermistor or an
end thermistor detected a
temperature of 250°C on the hot
roller.
-or-
Fusing temperature control
software error
• PSU defective
• IOB defective
• BICU defective
Fusing lamp overheat error 2 545 A
After hot roller reaches warmup
temperature, the fusing lamps
remained on at full capacity for 11
samplings (1.8 sec. duration) while
the hot roller was not rotating.
• Thermistor damaged, or out of position
• Fusing lamp disconnected
Zero cross signal malfunction 547 D
One of the following conditions is
detected 10 times:
• When the main switch is on, the
frequency measured by the
number of zero cross signals for
500 ms is larger than 66Hz or
smaller than 45 Hz.
• The interval between one zero
cross signal and the next is 7.5
ms or shorter 3 times
consecutively for 500 ms.
• Noise on the ac power line
Fusing Web End 550 A
Web end detected 5 times within
500 ms and web motor continues to
rotate 40 s. If web end is detected
for another 400 ms, then the SC is
logged.
• Web end (requires replacement)
• Web end sensor defective
Note: After replacing the web with a new
one, reset SP1902 001 to 0 to
release SC550.
551 A Fusing thermistor error 1