HP Color LaserJet Managed MFP M775 User Guide - Page 303

Problems with sending faxes Problem Faxes are transmitting very slowly. Faxes quit during sending. The fax accessory is receiving faxes but is not sending them. Outgoing fax calls keep dialing. Cause Solution You might be sending a complex fax, such Complex faxes take longer to transmit. as one with many graphics. The receiving fax machine might have a slow modem speed. The fax accessory only sends the fax at the fastest modem speed the receiving fax machine can use. Wait for the fax transmission to complete. The resolution at which the fax was sent or is being received is very high. A higher resolution typically results in better quality, but also requires a longer transmission time. Decrease the resolution and change the Optimize Text/Picture option. If there is a poor phone-line connection, the fax accessory and the receiving fax machine slow down the transmission to adjust for errors. Cancel and resend the fax. Ask the phone company to check the phone line. The document might have a gray background, which can increase fax transmission time. Use the Image Adjustment feature to clean up the background shading. The receiving fax machine might be malfunctioning. Try sending to another fax machine. The phone line might not be working. Disconnect the fax accessory from the phone jack, and connect a phone. Try to make a phone call to ensure the phone line is working. The phone line might be noisy or poor quality. Try using a slower fax speed to improve the reliability of transmission. Use the Fax Dialing Settings menu to set the fax speed for sending faxes. A call-waiting feature might be active. Verify that the fax telephone line does not have an activated call-waiting feature. A call-waiting notice can interrupt a fax call in progress, which causes a communication error. If the fax accessory is on a PBX system, the Disable the detect-dial-tone setting. PBX system might be generating a dial tone the fax accessory cannot detect. There might be a poor phone connection. Try again later. The receiving fax machine might be malfunctioning. Try sending to another fax machine. The phone line might not be working. Disconnect the fax accessory from the phone jack, and connect a phone. Try to make a phone call to ensure the phone line is working. The fax accessory automatically redials a fax number if the Redial On Busy option is on or if the Redial On No Answer option is on. This is normal operation. If you do not want the fax to retry, set the Redial On Busy option to 0, set the Redial On No Answer option to 0, and set the Redial on error option to 0. ENWW Solve fax problems 289