iii
4. SERVICE TABLES ...................................................................... 4-1
4.1 GENERAL CAUTION................................................................................ 4-1
4.1.1 PCU ................................................................................................. 4-1
4.1.2 TRANSFER ROLLER UNIT ............................................................. 4-1
4.1.3 LASER UNIT.................................................................................... 4-1
4.1.4 FUSING UNIT .................................................................................. 4-2
4.1.5 PAPER FEED .................................................................................. 4-2
4.1.6 OTHERS .......................................................................................... 4-2
4.2 SERVICE PROGRAM MODE................................................................... 4-3
4.2.1 ENABLING AND DISABLING SERVICE PROGRAM MODE .......... 4-3
4.2.2 SERVICE PROGRAM MODE MENU TREE .................................... 4-4
4.3 PRINTER CONTROLLER SERVICE MODE ............................................ 4-5
4.3.1 BIT SWITCH PROGRAMMING ....................................................... 4-5
4.3.2 NVRAM RESET ............................................................................... 4-6
4.3.3 POWER-ON DIAGNOSTICS ERROR DISPLAY ............................. 4-7
4.3.4 VENDER MAKER ............................................................................ 4-7
4.3.5 SERVICE SUMMARY ...................................................................... 4-7
4.4 PRINTER ENGINE SERVICE MODE ....................................................... 4-9
4.4.1 SERVICE MODE MENU .................................................................. 4-9
4.4.2 SERVICE MODE TABLES............................................................. 4-10
4.4.3 INPUT CHECK TABLE .................................................................. 4-16
4.4.4 OUTPUT CHECK TABLE .............................................................. 4-20
4.4.5 ENGINE BOARD PROGRAM DOWNLOAD .................................. 4-22
4.5 SERVICE TOOLS ................................................................................... 4-23
4.5.1 SERVICE TOOL MENU ................................................................. 4-23
4.5.2 HDD TEST ..................................................................................... 4-23
4.5.3 HDD FORMAT ............................................................................... 4-24
4.5.4 NIB NVRAM BACKUP AND RESTORE ........................................ 4-24
4.6 CONTROLLER FIRMWARE UPDATE ................................................... 4-26
4.6.1 FIRMWARE DOWNLOAD ............................................................. 4-26
4.6.2 ERROR RECOVERY..................................................................... 4-27
4.7 POWER-ON SELF TEST........................................................................ 4-28
4.7.1 PARALLEL LOOP-BACK TEST..................................................... 4-28
4.7.2 OTHER TESTS.............................................................................. 4-28
5. PREVENTIVE MAINTENANCE ................................................... 5-1
5.1 USER MAINTENANCE............................................................................. 5-1
5.2 SERVICE MAINTENANCE ....................................................................... 5-2
5.2.1 PM TABLE ....................................................................................... 5-2
6. REPLACEMENT AND ADJUSTMENT........................................ 6-1
6.1 LASER UNIT............................................................................................. 6-1
6.1.1 CAUTION DECAL LOCATIONS ...................................................... 6-1
6.1.2 LASER UNIT.................................................................................... 6-2
6.1.3 POLYGONAL MIRROR MOTOR ..................................................... 6-4
6.1.4 LASER DIODE (LD) UNIT ............................................................... 6-4
6.1.5 LASER SYNCHRONIZATION DETECTOR ..................................... 6-5
