User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–116
Fuser Error A:
DC Controller
Detects a
Fuser Heater
Error
If the fuser assembly is abnormally heated or if the fuser assembly does
not reach the specified temperature for some reason, the DC controller
will store a fuser heater error and then shut off the power supplied to
the heater.
The DC controller notifies the I/O controller of this fuser heater error.
The DC controller measures the time elapsed after the power is shut off
(see note 2 on the next page). If a fuser heater error occurs and then the
power is turned on within 30 minutes of having been turned off, the DC
controller will determine that the temperature of the fuser heater is not
low enough and keep the fuser heater off.
The DC controller recognizes any of the following situations as a fuser
heater error:
• When the power is turned on, a fuser assembly error is found stored
in the DC controller.
• Sixty seconds after the power is turned on, the value of the fuser
temperature detect signal (
THI) sent to the CPU on the DC controller
has not changed.
• After the fuser heater is turned on, any of the following phenomena
occur:
– The temperature of the fuser heater does not reach 40°C within
130 seconds.
– The temperature of the fuser heater does not reach 60°C within
80 seconds of reaching 40°C.
– The temperature of the fuser heater does not reach 80°C within
80 seconds of reaching 60°C.
– The temperature of the fuser heater does not reach 100°C within
80 seconds of reaching 80°C.
– The temperature of the fuser heater does not reach 120°C within
80 seconds of reaching 100°C.
– The temperature of the fuser heater does not reach the target
value within 160 seconds of reaching 120°C.
• The temperature of the fuser heater falls below 120°C after it has
already reached the target value.
• The temperature of the fuser heater exceeds 200°C during the
standby or print period (the fuser heater malfunctions).