HP LaserJet Enterprise MFP M725 series - Manual (Page 294)

Solve fax problems
Checklist for solving fax problems
Use the following checklist to help identify the cause of any fax-related problems you encounter:
● Are you using the fax cable supplied with the fax accessory? This fax accessory has
been tested with the supplied fax cable to meet RJ11 and functional specifications. Do not
substitute another fax cable; the analog-fax accessory requires an analog-fax cable. It also
requires an analog phone connection.
● Is the fax/phone line connector seated in the outlet on the fax accessory? Make
sure that the phone jack is correctly seated in the outlet. Insert the connector into the outlet until it
"clicks."
● Is the phone wall jack working properly? Verify that a dial tone exists by attaching a
phone to the wall jack. Can you hear a dial tone, and can you make or receive a phone call?
What type of phone line are you using?
● Dedicated line: A standard analog fax/phone line assigned to receive or send faxes.
NOTE: The phone line should be for product fax use only and not shared with other types of
telephone devices. Examples include alarm systems that use the phone line for notifications to a
monitoring company.
● PBX system: A business-environment phone system. Standard home phones and the fax
accessory use an analog phone signal. Some PBX systems are digital and might not be compatible
with the fax accessory. You need to have access to a standard analog phone connection to be
able to send and receive faxes.
● Roll-over lines: A phone system feature where a new call "rolls over" to the next available line
when the first incoming line is busy. Try attaching the product to the first incoming phone line. The
fax accessory answers the phone after it rings the number of times set in the rings-to-answer
setting.
NOTE: Roll-over lines can cause problems with receiving faxes. Using roll-over lines with this
product is not recommended.
Are you using a surge-protection device?
A surge-protection device can be used between the wall jack and the fax accessory to protect the fax
accessory against electrical power passed through the phone lines. These devices can cause some fax
communication problems by degrading the quality of the phone signal. If you are having problems
sending or receiving faxes and are using one of these devices, connect the product directly to the
phone jack on the wall to determine whether the problem is with the surge-protection device.
280 Chapter 10 Solve problems ENWW