Canon LASER CLASS 730i, Service Manual

Page: 125 / 436

LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
4-42
4.4 Processing Communication Problems
4.4.1 Initial identification of problems
Since the facsimile must transmit picture information, a transmitter, a receiver and telephone
lines are required for this purpose. Transmissions may cause problems if one or more of the
there is poor.
Figure 4-10 Communication Trouble
To process communication ploblrems, first of all, it is necessary to narrow down the cause of
the problem. Thus, the procedures appearing below must be checked accordingly.
Figure 4-11 Procedures for Initial Identification of Trouble
FAX FAX
Your
customer's
machine
Communication
companion
machine
Communication
trouble
Start
Is copying
being done?
Communication problems
exist. Carry out the procedures
on the next page.
NG
Do copying
Is copy
picture OK?
NG
NO
Does an error
appear on the
display?
Errors show on the display.
error massage page 4-11
error code
page 4-18
General error
Page 4-30
Printing problem
Page 4-30
Test print
OK
Scanning problem
Page 4-37
NG
YES
OK
OK