Service manual

Chapter 13
13-45
13.2.5 Transmission/Fax-Related
13.2.5.1 Transmission Problem
13.2.5.1.1 Troubleshooting Communication Faults
0006-4529
Go through the "troubleshooting flow chart" in the "Making Initial Checks"; if you cannot reach the last step of the
flow of work and the fault occurs while a fax function is in use, go through the following.
1) Find out the conditions in which the fault occurs in detail.
a. operation used; i.e., number of pages, transmission mode, timing of error occurrence (as before or after
transmission), user of auto-dialing
b. faulty image samples (store away; in the case of reception)
c. LCD indication at time of the fault
d. activity report at time of the fault
e. user information: abbreviation, telephone number, fax number, model name
f. other-party information: name, telephone number, fax number, model
g. frequency of occurrence, type of error
h. fax condition at other party; number of pages transmitted/received, auto or manual; reception condition
REF:
If you are visiting in response to a report, try to obtain a system dump list for a. and g.
2) Go through the following flow chart to conduct a communication test.
- Try a test several times for each item using the actual telephone line; check the symptoms, and keep a record.
3) Evaluate all the information you have colleted, and take appropriate action based on comprehensive evaluation.
REF:
If the other party is a non-Canon machine and no fault is found in the user's machine, arrange for an investigation of
the other party. Advise the user on the situation.
- Troubleshooting a Communication Fault (Canon machine in use)
Try a 3-station communication as indicated in the following diagram:
9) Try replacing the printer controller PCB. Is the problem
corrected?
YES
:
End.
NO: Replace the image processor PCB.