HP Color LaserJet Enterprise Multifunction M680 Printer series - Manual (Page 10)

Clean the pickup rollers and separation pad in the document feeder ........................................... 165
Improve fax image quality ................................................................................................................................ 167
Send-fax quality issues ................................................................................................................... 167
Check the scanner glass for dirt and smudges ............................................................ 167
Check the send-fax resolution settings ....................................................................... 168
Check the image-adjustment settings ......................................................................... 169
Optimize fax quality for text or pictures ...................................................................... 169
Check the error-correction settings ............................................................................. 169
Send to a different fax machine ................................................................................... 170
Clean the pickup rollers and separation pad in the document feeder ........................ 170
Receive-fax quality issues .............................................................................................................. 171
Check the fit-to-page setting ....................................................................................... 171
Check the sender's fax machine ................................................................................... 171
Solve wired network problems ......................................................................................................................... 173
Poor physical connection ................................................................................................................ 173
The computer is using the incorrect IP address for the product ................................................... 173
The computer is unable to communicate with the product ........................................................... 173
The product is using incorrect link and duplex settings for the network ...................................... 174
New software programs might be causing compatibility problems ............................................. 174
The computer or workstation might be set up incorrectly ............................................................ 174
The product is disabled, or other network settings are incorrect ................................................. 174
Solve fax problems ............................................................................................................................................ 175
Checklist for solving fax problems ................................................................................................. 175
What type of phone line are you using? ....................................................................... 175
Are you using a surge-protection device? .................................................................... 175
Are you using a phone company voice-messaging service or an answering
machine? ....................................................................................................................... 175
Does your phone line have a call-waiting feature? ..................................................... 176
Check fax accessory status .......................................................................................... 176
General fax problems ...................................................................................................................... 177
The fax failed to send ................................................................................................... 177
An Out of Memory status message displays on the product control panel ................ 177
Print quality of a photo is poor or prints as a gray box ............................................... 177
You touched the Stop button to cancel a fax, but the fax was still sent ..................... 177
No fax address book button displays ........................................................................... 177
Not able to locate the Fax settings in HP Web Jetadmin ............................................. 177
The header is appended to the top of the page when the overlay option is
enabled ......................................................................................................................... 177
A mix of names and numbers is in the recipients box ................................................. 177
A one-page fax prints as two pages ............................................................................. 178
A document stops in the document feeder in the middle of faxing ............................ 178
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