Detecting Errors In The Power Supply Pcb; Communication Error Between Dc Controller Pcb And Composite Power Supply Pcb; Error In The High-Voltage Output Data; Low-Voltage Output Data Error - Canon NP6218 Service Manual

CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
C. Detecting Errors in the Power Supply PCB
The microprocessor (Q512) on the composite power supply PCB either displays an
error message on the display by communicating with the DC controller or flashes
LED501 to indicate the presence of an error if any of the following is identified.
1. Communication Error between DC Controller PCB and Composite Power
Supply PCB
If an error occurs in the communication between the DC controller PCB and the
composite power supply PCB, E240 is indicated as soon as it is detected by the
microprocessor on the DC controller PCB. If an error is detected by the composite power
supply, the LED is flashed at intervals of 5 sec.

2. Error in the High-Voltage Output Data

If the difference between the setting associated with the high voltage generated by
the microprocessor (Q512) on the composite power supply PCB and the control value is
greater than the specified value, the microprocessor (Q512) sends error data to the DC
controller PCB, which in turn indicates E064.

3. Low-Voltage Output Data Error

If the difference between the setting associated with the low voltage generated by the
microprocessor (Q512) on the composite power supply PCB and the control value is
greater than the specified value, the microprocessor (Q512) communicates with the DC
controller PCB, which in turn indicates E803.

4. Overcurrent in the Low-voltage Power Supply

If the composite power supply PCB identifies overcurrent because of an error in a DC
load or wire is trapped, the LED is flashed at intervals of 2 sec for 20 sec.
Reference:
Normally, the LED is flashing at intervals of 0.5 sec.
7-4
COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)