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4710S AND TIMING Bg
C. Detecting Errors by the
Composite Power Supply
PCB
The copier's composite power supply
PCB is equipped with a microprocessor
(Q501) which serves to run a self diagnosis
program to check the output from each
power supply and its communications with
the DC controller PCB.
When an error occurs, the microproces-
sor communicates
with the DC controller
PCB so that the results of self diagnosis may
be indicated in the display on the control
panel.
1.
Overcurrent (low voltage)
If the composite power supply PCB finds
an error in a DC load, it will turn off the relay
(RL101) to cut off the AC input.
2.
Error in the Control Value (high volt-
age)
If the composite power supply PCB finds
that the difference between the setting and
the actual value of either of the following
voltages is not as specified, it will indicate
'E064' on the control panel.
¢ primary DC bias
* developing DC bias
* transfer bias
3.
Error in the Control Value (low voit-
age)
If the composite power supply PCB finds
that the difference between the setting for
+24 V of the DC output and the control value
is not as specified, it will indicate 'E803' on
the display of the control panel.
4,
Error in the Communication with the
DC Controller
If the DC controller PCB finds an error in
the communication
between the DC con-
troiler PCB and the composite power supply
PCB, 'E240' will appear in the display of the
control panel for about 4 sec; thereafter, the
relay (RL101) is turned off to cut off the AC
input.
COPYRIGHT © 1996 CANON INC.
CANON NP6O12/NPEOI2F/NP6212 REV.t SEPT. 1995 PRINTED
IN JAPAN (IMPRIME AU JAPON}
D. Protection Mechanism of
the Power Supply Circuit
The composite power supply PCB has
an overcurrent detection function which
turns on to stop the output.
When the output has stopped, it may be
reset by opening the copier's top unit, cor-
recting the load, and turning on the power
switch.
The built-in fuse (FU102), however, will
blow if loads are repeatedly short circuited
and reset.
3-67
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