CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
7-6
C.
Detecting an Error on the Composite Power Supply PCB
The machine's composite power supply PCB is equipped with a self diagnostic function to
check each power output and the communication with the DC controller PCB using the micropro-
cessor (Q900) mounted on it.
If any of the following errors occurs, the microprocessor will exchange signals with the DC
controller PCB, and will indicate the result of self diagnosis on the control panel.
1.
Detecting an Over-Current in the Low-Voltage System
If an over-current is detected because of a fault in a DC load, the composite power supply PCB
will turn off the relay (RL601) to cut the AC input.
2.
Detecting a Fault in the High-Voltage Control Value
If a deviation is found between the setting value and the actual value is detected in any of the
following voltages, the composite power supply will indicate ‘E064’ on the control panel.
• Primary charging DC bias
• Developing DC bias
• Transfer bias
3.
Detecting a Fault in the Low-Voltage Control Value
If a deviation is detected between the setting value and the actual control value in +24 V (DC
output), the composite power supply PCB will indicate ‘E803’ on the control panel.
4.
Fault in the Communication with the DC Controller
If the DC controller PCB detects a fault in the communication with the composite power sup-
ply PCB, ‘E240’ will be indicated on the control panel for about 4 sec, and then the relay (RL601)
will be turned off to cut the AC input.
D.
Protecting the Power Supply Circuit
The composite power supply PCB is equipped with an over-current detection function which
turns on a protective mechanism to stop output if a load suffers a short-circuit.
If the output has stopped, it may be reset by opening the machine's top unit, correcting the load,
and then turning the power switch back on.
Keep in mind, however, that repeated short-circuiting and resetting can blow the fuse (FU102).
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