Gestetner G060 Service Manual page 21

6.2 PROCESS CONTROL.............................................................................. 6-8
6.2.1 OVERVIEW ..................................................................................... 6-8
6.2.2 POTENTIAL CONTROL .................................................................. 6-8
Overview .............................................................................................. 6-8
Process Control Self Check ................................................................. 6-9
6.2.3 PROCESS CONTROL SELF CHECK PROCEDURE.................... 6-10
Step 1: V
Step 2: ID Sensor Solid Pattern Generation....................................... 6-11
Step 3: Sensor Pattern Detection....................................................... 6-11
Step 4: Toner Amount Calculation ..................................................... 6-11
Step 5: V
Step 6: ID Sensor Highlight Pattern Generation................................. 6-12
Step 7: Sensor Pattern Density Detection.......................................... 6-12
Step 8: V
6.2.4 TONER SUPPLY CONTROL......................................................... 6-14
Overview ............................................................................................ 6-14
Toner Supply Control Modes ............................................................. 6-14
6.2.5 TONER NEAR END/TONER END DETECTION ........................... 6-15
Introduction ........................................................................................ 6-15
Toner Near End Detection ................................................................. 6-15
Toner End Detection .......................................................................... 6-15
Toner End Recovery .......................................................................... 6-15
6.2.6 DEVELOPER INITIALIZATION...................................................... 6-16
6.3 LASER EXPOSURE ............................................................................... 6-17
6.3.1 OVERVIEW ................................................................................... 6-17
6.3.2 OPTICAL PATH ............................................................................. 6-18
6.3.3 LASER SYNCHRONIZING DETECTOR ....................................... 6-19
Overview ............................................................................................ 6-19
Main Scan Start Detection ................................................................. 6-19
Clock Frequency Adjustment ............................................................. 6-19
6.3.4 DUAL BEAM WRITING.................................................................. 6-20
Dual Beam Mechanism ...................................................................... 6-20
Laser Beam Pitch Change Mechanism .............................................. 6-20
6.3.5 LD SAFETY SWITCH .................................................................... 6-21
6.3.6 AUTOMATIC LINE POSITION ADJUSTMENTS ........................... 6-22
Overview ............................................................................................ 6-22
Sub Scan Line Position for YCM ........................................................ 6-23
Main Scan Line Position for KYCM .................................................... 6-23
Magnification Adjustment ................................................................... 6-23
Main Scan Skew Adjustment ............................................................. 6-24
6.4 PHOTOCONDUCTOR UNIT .................................................................. 6-25
6.4.1 OVERVIEW ................................................................................... 6-25
6.4.2 DRIVE............................................................................................ 6-26
6.4.3 DRUM CHARGE AND QUENCHING ............................................ 6-27
6.4.4 DRUM CLEANING......................................................................... 6-28
6.4.5 WASTE TONER COLLECTION..................................................... 6-29
6.4.6 WASTE TONER BOTTLE FULL DETECTION .............................. 6-30
6.4.7 PCU DETECTION (DEVELOPMENT UNIT DETECTION) ............ 6-31
6.5 DEVELOPMENT..................................................................................... 6-32
SM
Adjustment ..................................................................... 6-10
SG
, V , V Selection and V
D B L
(LD Power) Selection ........................................................ 6-13
L
Adjustment ........................... 6-11
REF
v G060