6 – 17Chapter 6 Principle of Operation (Fax)Version 1 2006.11.217. Fault Isolation Procedure for FAXBecause a FAX is composed of multiple blocks, pinpointing a fault is problematic.This section describes a simple fault isolation procedure that is based on the contents of 4. FAXSystem (Overview).7.1 Fault OccursFirst, try using the copy function. If the copy function's printing results are correct, the probability of afault in the FAX itself is low. The fault is likely in the telephone line or receiving FAX. If the fault is in thetelephone line, first retry sending. If there is no improvement, contact the telephone company. If thecopy function's printing results are incorrect, it can be determined if the fault is in the scanner or printerby operating each unit separately via a computer.7.2 Send Fault1) Problem with printing quality at receiving FAX, such as corrupt image, lines in image, top/bottomcut off.a) If copy function is normalCause: Degraded telephone line connection caused by noise, etc.; or a fault in receiving FAX'sprinter.Corrective Action:Determine whether fault is in telephone line or at receiving FAX by trying copy function atreceiving FAX.If the telephone line condition is degraded, white horizontal lines, missing rows,and/or cut-off top/bottom may occur.Branch connections or incoming call (call waiting) may also cause imagecorruption.b) If copy function is faultyCause: Dirt or fault in scanner.Corrective Action:Clean platen glass or repair scanner. If the original is being sent from the ADF, try executinga copy with the original placed on the platen glass. If this solves the problem, the fault is inthe ADF.
