Dell 3115cn Service Manual page 209

FIP-1. 77 Illegal Data 033-783/034-799/No Dial Tone 035-746/035-773/035-774
Regarding a fax error, a communication test is available between the customer and
Dell, thereby allowing you to analyze the trouble.
The communication test can be performed from the customer to the Dell site for
transmission errors, and from the Dell site to the customer for reception errors.
Replace the PWBA HYUI.
(Removal64/Replacement
58)
Version 2 2007.05.22
Possible causative parts: PWBA HYUI (PL13.4.1)
Checking the printer setting.
Yes
Checking the PWBA HYUI
installation
Reseat the PWBA HYUI.
(Removal64/Replacement
58)
Yes
Does the error still
occur when faxing?
Checking the dial data
Check the dial data
Yes
Is the dial data
correct?
Is the [Country] of
No
[Fax setting] on the
[Admin Menu]
correct?
Set the [Country] correctly.
No
END
Chapter 1 Troubleshooting
No
Set the dial data.