Canon MultiPASS C755, Service Manual, Page: 87 / 143

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MultiPASS C755 Chapter 3: Maintenance & Service
4.4.2 Procedures for processing communication problems
If the problem proves to be communication trouble, deal with it according to the following procedures.
(1) Study the conditions at the time of trouble as closely as possible.
Record or keep the items listed below.
a) Operations at the time of trouble
Document number, transmission mode, error occurrence timing call set-up method
(auto dialing etc.)
b) Sample of defective picture (When receiving)
c) LCD display at the time of trouble
d) Communication management report at the time of trouble
e) User’s name, telephone number (to contact), Fax number, model name
f) User’s name of the other party, telephone number (to contact), Fax number, model name, name of
servicemen in charge
g) Frequency of trouble and error code (## 100 etc)
h) Condition of the other party’s facsimile:
Transmitted/received page number? Automatic or manual?
Error occurred? The receive condition? etc.
When visiting a user with a trouble report, a) can be known by outputting the error
protocol data (or error dump), and g) can be known by outputting the total transaction
report (or the system error data list).
(2) Test communication according to flowchart procedures appearing on the next page.
• Carry out the tests with the actual lines on each item several times, verify the symptoms and record it.
• In the case of trouble with another manufacturer’s facsimile, refer to the flowchart for troubles with
other manufacture’s.
(3) Finally, process over by judging systematically all the data.
If the other party’s facsimile is that of another manufacturer and there is nothing wrong
with your customer’s machine, it is recommended that you ask your customer to contact
the facsimile user of the other party, so that the other party’s facsimile is checked by the
dealer.
"Call the service station"
in the flowchart (
Fig. 3-16
) means that problems may
occur with regard to the communucation compatibility of facsimile, consult the matter
with the staff in charge at the service station. To quicken the resolving of the problem,
report the information listed in (1) above.
NOTE
NOTE