Chapter 1313-3*1: When executing test printing, be sure to select the source of paper used by the user when the fault occurred.*2: For malfunctions related to the ADF, see the descriptions of faults unique to machines equipped with ADFfunctions. Likewise, if a malfunction occurs while printing from a PC or a fax communication, see its respectivesection (those unique to printer functions or those unique to fax functions).13.1.8 Making Checks in Response to an Image Fault 0006-3265When you have indicated an image fault using the troubleshooting flow chart, go throughthe following before starting troubleshooting work that follows:Checking the Originals Against the SymptomDetermine whether the fault is caused by the machine or the original:a. The copy density is best set to index 5 -/+ 2.b. Originals with a bluish background tend to cause poor contrast; e.g., blue sheet, receipts.c. The density of the original affects its copies: e.g., a diazo copy original or an original with a high transparency canproduce output that can be mistaken for "foggy copies," while originals prepared in light pencil can produce outputthat can be mistaken for "light" copies.Copyboard Glass and White SheetIf the copyboard glass or the white sheet is soiled, wipe it with a moist cloth and then dry wipe it. If the dirt isexcessive, use alcohol and lint-free paper. If there are scratches, replace it.13.1.9 Checking the Photointerrupters 0007-3728Use 'SENSOR' under 'TEST MODE' in service mode to check photointerrupters as follows:1) Press the Additional Functions key and the # key to start service mode.2) Press the Left/Right Arrow key so that 'TEST MODE' is indicated.3) Press '6' on the keypad so that '6: FACULTY TEST' is indicated.4) Press '3' on the keypad to start sensor check mode, in which the following screen appears:F-13-25) When the screen shown in the foregoing figure is displayed, press '1', '2', '3', or '4' to bring up the State screen ofa specific sensor. For instance, when '1' is pressed, the following will be true:6-3:SENSOR[1] - - - [4]
