E030 (The Total Copy Counter Fails To Turn On.); E031 (The Option Counter Has An Open Circuit.) - Canon NP6251 Service Manual

CHAPTER 11 TROUBLESHOOTING

12. E030 (The total copy counter fails to turn on.)

Cause Step
Total copy 1
counter
Total copy 2
counter
DC controller
PCB

13. E031 (The option counter has an open circuit.)

Cause Step
Option counter 1
Total copy 2
counter
DC controller
PCB
11-92
COPYRIGHT © 1997 CANON INC.
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Checks
Turn off the power switch, and
disconnect J104 from the DC
controller. Set the meter to the ×
1K range, and measure the
resistance between J104B-2 and
J104B-1. Is it about 500 ?
Connect J104 to the DC controller
PCB, and turn on the power
switch. Set the meter to the
30VDC range, and measure the
voltage between J104B-2 (+) and
J104A-6 (–) on the DC controller
PCB. When the Copy Start key is
pressed, does it change from
about 24 V to about 0 V and then
to 24 V?
Checks
Turn off the power switch, and
disconnect J104 from the DC
controller. Set the meter to the ×
1KΩ range, and measure the
resistance between J104B-6 and
J104B-7. Is it about 500Ω?
Connect J104 to the DC controller
PCB, and turn on the power
switch. Set the meter to the
30VDC range, and measure the
voltage between J104B-6 (+) and
J104A-6 (–) on the DC controller
PCB. Does it change from about
24 V to about 0 V and then to
about 24 V?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO Action
NO Check the wiring from
the DC controller PCB to
the total copy counter; if
normal, replace the total
copy counter.
YES Replace the total copy
counter.
NO Replace the DC
controller PCB.
YES/NO Action
NO Check the wiring from
the DC controller PCB to
the total copy counter; if
normal, replace the total
copy counter.
YES Replace the total copy
counter.
NO Replace the DC
controller PCB.