HP Color LaserJet Enterprise Multifunction M680 Printer series - Manual (Page 189)

General fax problems
The following are some common fax problems.
The fax failed to send
JBIG is enabled, and the receiving fax machine does not have JBIG capability.
Turn off the JBIG setting.
An Out of Memory status message displays on the product control panel
The product storage disk is full.
Delete some stored jobs from the disk. From the Home screen on the product control panel, touch the
Retrieve from Device Memory button. Open the list of stored jobs or stored faxes. Select a job to delete, and
then touch the Delete button.
Print quality of a photo is poor or prints as a gray box
You are using the wrong page-content setting or the wrong resolution setting.
Try setting the Optimize Text/Picture option to Photograph setting.
You touched the Stop button to cancel a fax, but the fax was still sent
If the job is too far along in the sending process, you cannot cancel the job.
This is normal operation.
No fax address book button displays
The fax address book feature has not been enabled.
Use the HP MFP Digital Sending Software Configuration utility to enable the fax address book feature.
Not able to locate the Fax settings in HP Web Jetadmin
Fax settings in HP Web Jetadmin are located under the device's status page drop-down menu.
Select Digital Sending and Fax from the drop-down menu.
The header is appended to the top of the page when the overlay option is enabled
For all forwarded faxes, the product appends the overlay header to the top of a page.
This is normal operation.
A mix of names and numbers is in the recipients box
Names and numbers can both display, depending on where they are from. The fax address book lists names,
and all other databases list numbers.
This is normal operation.
ENWW Solve fax problems 177