vi
Maintenance..................................................................................... 5-108
5.12 DIP SWITCHES.................................................................................. 5-109
Controller Board ............................................................................... 5-109
BCU Board....................................................................................... 5-109
6. DETAILED SECTION DESCRIPTIONS....................................... 6-1
6.1 OVERVIEW .............................................................................................. 6-1
6.1.1 COMPONENT LAYOUT .................................................................. 6-1
6.1.2 PAPER PATH .................................................................................. 6-2
6.1.3 DRIVE LAYOUT............................................................................... 6-3
6.1.4 BOARD STRUCTURE ..................................................................... 6-4
Overview .............................................................................................. 6-4
Descriptions ......................................................................................... 6-5
6.1.5 PRINTING PROCESS ..................................................................... 6-7
6.2 PROCESS CONTROL.............................................................................. 6-9
6.2.1 OVERVIEW...................................................................................... 6-9
6.2.2 POTENTIAL CONTROL .................................................................. 6-9
Overview .............................................................................................. 6-9
Process Control Self Check ............................................................... 6-10
6.2.3 PROCESS CONTROL SELF CHECK PROCEDURE.................... 6-11
Step 1: VSG Adjustment .................................................................... 6-11
Step 2: ID Sensor Solid Pattern Generation....................................... 6-12
Step 3: Sensor Pattern Detection....................................................... 6-12
Step 4: Toner Amount Calculation ..................................................... 6-12
Step 5: VD, VB, VL Selection and VREF Adjustment......................... 6-13
Step 6: ID Sensor Highlight Pattern Generation................................. 6-14
Step 7: Sensor Pattern Density Detection.......................................... 6-14
Step 8: VL (LD Power) Selection........................................................ 6-14
6.2.4 VREF COMPENSATION DURING A PRINT JOB ......................... 6-15
Highlight Pattern................................................................................. 6-15
Adjustment Process ........................................................................... 6-15
6.2.5 TONER SUPPLY CONTROL......................................................... 6-16
Overview ............................................................................................ 6-16
Toner Supply Control Modes.............................................................. 6-16
6.2.6 TONER NEAR END/TONER END DETECTION ........................... 6-17
Introduction ........................................................................................ 6-17
Toner Near End Detection 1............................................................... 6-18
Toner Near End Detection 2............................................................... 6-18
Toner End Detection .......................................................................... 6-19
Toner End Recovery .......................................................................... 6-19
6.2.7 DEVELOPER INITIALIZATION...................................................... 6-20
6.3 LASER EXPOSURE ............................................................................... 6-21
6.3.1 OVERVIEW.................................................................................... 6-21
6.3.2 OPTICAL PATH ............................................................................. 6-22
6.3.3 LASER SYNCHRONIZING DETECTOR ....................................... 6-23
Overview ............................................................................................ 6-23
Main Scan Start Detection.................................................................. 6-23
Clock Frequency Adjustment ............................................................. 6-23