Ricoh Aficio 480W Dolphin-C2 Service Manual page 160

SERVICE CALL CONDITIONS
SC547 D Zero-cross signal malfunction
One of the following conditions has
occurred:
• Abnormal mains frequency was detected
more than 10 times.
• No zero-cross signal detected for 3 s
while the relay is on.
•
No zero-cross signal detected for 3.5 s
after the main switch is turned on.
SC549 A Pressure roller thermistor abnormal
During fusing motor rotation, pressure
roller temperature detected lower than 7°C
(44.6°F) for 5 s.
SC591 B Cutter 1 home position error 1
Both left and right home position switches
of the upper cutter were on just after the
main switch was turned on, or just after the
upper feed tray was opened and closed.
SC592 B Cutter 1 home position error 2
The left home position switch stays on 300
ms after the cutter motor turns on.
SC593 B Cutter 1 home position error 3
The home position switch stays off 1 s after
the cutter motor turns on.
SC594 B Cutter 2 home position error 1
Both left and right home position switches
of the lower cutter were on just after the
main switch was turned on, or just after the
lower feed tray was opened and closed.
SC595 B Cutter 2 home position error 2
The left home position switch stays on 300
ms after the cutter motor turns on.
• Electrical noise on the power
line.
• PSU defective.
• Thermistor shorted,
disconnected, or its
connector is damaged.
• Right or left home position
switch defective.
• Cutter motor cable
disconnected
• Cutter motor overload
• Motor defective
• Cutter motor cable
disconnected
• Cutter motor overload
• Motor defective
• Right or left home position
switch defective.
• Cutter motor cable
disconnected
• Cutter motor overload
• Motor defective
4-8
28 April 2005