HP Color LaserJet Enterprise CM4540 Service Manual - Page 690

Solve fax problems Is your fax set up correctly? Use the following checklist to help identify the cause of any fax related problems you are encountering: ● Are you using the phone cord supplied with the fax accessory? This fax accessory has been tested with the supplied phone cord to meet RJ11 and functional specifications. Do not substitute another phone cord; the analog-fax accessory requires an analog phone cord. It also requires an analog phone connection. ● Is the fax/phone line connector seated in the socket on the fax accessory? Make sure that the phone jack is well seated in the socket. The connector should be inserted into the socket 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 a phone call? What type of phone line are you using? ● Dedicated line: A standard fax/phone number 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 companies. ● 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 line 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 fax accessory to the first incoming phone line. The fax accessory will answer the phone after it rings the number of times set in the rings-toanswer setting. NOTE: Roll-over lines can cause problems with the fax accessory's ability to receive faxes. Using rollover 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 fax accessory directly to the phone jack on the wall to determine whether the problem is with the surge-protection device. 638 Chapter 3 Solve problems ENWW