iii
5.4.2 DOCUMENT TABLE POSITION SENSOR.....................................5-11
5.4.3 PICK-UP CLUTCH/DOCUMENT TABLE LIFT CLUTCH ................5-12
5.5 SCANNER ...............................................................................................5-13
5.5.1 EXPOSURE GLASS .......................................................................5-13
5.5.2 EXPOSURE LAMP .........................................................................5-14
5.5.3 SBU/LAMP STABILIZER/SCANNER MOTOR/PSU .......................5-15
5.5.4 IOB .................................................................................................5-16
5.5.5 SOP ................................................................................................5-17
5.5.6 HOME POSITION SENSOR...........................................................5-17
5.5.7 ADF INTERLOCK SWITCH ............................................................5-18
5.5.8 SCANNER WIRE............................................................................5-19
5.6 PCB .........................................................................................................5-22
5.6.1 SCU/RCU/IPU ................................................................................5-22
6. TROUBLESHOOTING................................................................. 6-1
6.1 SELF-DIAGNOSTICS................................................................................6-1
6.2 CHECK ITEMS ..........................................................................................6-1
6.2.1 ITEMS CHECKED DURING INITIALIZATION ..................................6-1
6.3 ERROR INDICATION ................................................................................6-2
6.3.1 USER LEVEL ERROR INDICATION ................................................6-2
6.3.2 TECHNICIAN LEVEL ERROR INDICATION ....................................6-2
6.4 TROUBLESHOOTING PROCEDURES ....................................................6-3
6.4.1 USER-VISIBLE ERROR CONDITIONS............................................6-3
6.4.2 SERVICE CALL ERRORS (SYSTEM ERRORS) .............................6-8
6.5 INDICATION WHEN A CONNECTOR IS OUT OF POSITION................6-14
6.5.1 SCANNER ......................................................................................6-14
6.5.2 ADF ................................................................................................6-15
6.6 BLOWN FUSE CODITIONS ....................................................................6-16
7. OPTION ....................................................................................... 7-1
7.1 IPU (IMAGE PROCESSING UNIT)............................................................7-1
7.1.1 OVERVIEW ......................................................................................7-1
7.2 IMAGE PROCESSING PATH....................................................................7-2
