Canon NP6621, Service Handbook, Page: 3 / 146

i
In this Handbook, work procedures are given in the form of tables instead of flow charts used generally.
Familiarize yourself by studying the example below.
EX. AC power is absent.
Guide To Tables
Cause
Power plug
Covers
Power source
Remedy
Connect the power plug.
Close the door or the cover.
The problem is not of the copier.
Advise the customer as such.
Go to step 6.
Step
1
2
3
4
Checks
Is the power plug connected to
the power outlet?
Are the front door and delivery
cover closed properly?
Is the rated voltage present at
the power outlet?
Is the rated voltage present
between J1-1 and -2 (near
cord plate)?
Yes/No
NO
NO
NO
YES
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To find out the cause (problem part) of a single problem, refer to the item under “Cause.” For “AC power
is absent,” the cause may be the power plug, covers, power source, or others.
■
To find out the checks to make or remedies to provide for a single problem, refer to the “Checks” and
“Remedy”; make checks, answer to the questions YES or NO, and provide remedies accordingly. If the
answer is otherwise, proceed to the next step.
YES
YES
YES
■
Checks on the voltage using a meter call for special note; the description “Check the voltage between
J109-1 (+) and J109-2 (–) on the DC controller PCB” means that the positive probe of the meter should
be placed on J109-1 (+) and the negative probe, on J109-2 (–).
<Step>
1
2
3
<Checks>
Is the power plug
connected to the
power outlet?
Are the front door
and delivery cover
closed properly?
Is the rated voltage
present at the power
outlet?
<Yes/No>
NO
NO
NO
▼
▼
▼
<Remedy>
Connect the power
plug.
Close the door or
the cover.
The problem is not
of the copier. Advise
the customer as
such.
▼
▼
▼