HP Color LaserJet Enterprise MFP M680 User Guide 1 - 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 viii ENWW