Step 6: secondary transfer...................................................................................96 Step 7: separation................................................................................................97 Fusing stage.........................................................................................................................98 Step 8: fusing.......................................................................................................98 Step 9: roller charging (auxiliary transfer belt cleaning roller).............................98 Step 10: roller charging (transfer-belt cleaning roller).........................................99 Step 11:
transfer belt cleaning.............................................................................99 Step 12:
drum cleaning......................................................................................100 Print cartridge......................................................................................................................102 Imaging-drum E-label.........................................................................................................103 Scanner and ADF functions and operation.........................................................................................104 Scanner functions ..............................................................................................................104 Scanner operation...............................................................................................................104 ADF operation.....................................................................................................................105 ADF paper path and ADF sensors.....................................................................................105 ADF jam detection..............................................................................................................106 Fax functions and operation................................................................................................................107 PSTN operation..................................................................................................................107 To receive faxes when you hear fax tones.........................................................................107 The fax subsystem..............................................................................................................107 Formatter in the fax subsystem..........................................................................................108 LIU in the fax subsystem....................................................................................................108 Safety isolation...................................................................................................108 Safety-protection circuitry...................................................................................108 Data path............................................................................................................109 Hook state..........................................................................................................109 Downstream current detection...........................................................................109 Hook switch control............................................................................................109 Ring detect.........................................................................................................110 Line current control............................................................................................110 Billing (metering) tone filters..............................................................................110 Fax page storage in flash memory.....................................................................................110 Stored fax pages................................................................................................111 Advantages of flash memory storage ...............................................................111 5 Removal and replacement Chapter contents.................................................................................................................................113 Removal and replacement strategy ....................................................................................................114 Required tools.....................................................................................................................114 Screws................................................................................................................................114 Electrostatic discharge........................................................................................................115 Before performing service...................................................................................................116 After performing service......................................................................................................116 Post-service tests................................................................................................................116 Test 1 (print-quality test)....................................................................................116 Test 2 (copy-quality test)....................................................................................117 Test 3 (fax-quality test).......................................................................................117 Test 4 (memory-card test)..................................................................................117 Parts removal order............................................................................................................118 User-replaceable parts........................................................................................................................119 vi ENWW