Gestetner G056 Service Manual page 19

5.5 POWER-ON SELF TEST ........................................................................5-16
5.6 OTHER TESTS .......................................................................................5-16
5.7 USER PROGRAM MODE .......................................................................5-17
5.8 DIP SWITCHES.......................................................................................5-18
Controller Board..................................................................................5-18
Engine Board ......................................................................................5-18
5.9 FIRMWARE HISTORY ............................................................................5-19
5.9.1 G056/G058 ENGINE FIRMWARE MODIFICATION HISTORY ......5-19
5.9.2 G056/G058 NIB FIRMWARE MODIFICATION HISTORY..............5-20
5.9.3 G056/G058 CONTROLLER FIRMWARE HISTORY ......................5-23
DETAILED DESCRIPTIONS
6. DETAILED SECTION DESCRIPTIONS ....................................... 6-1
6.1 OVERVIEW ...............................................................................................6-1
6.1.1 MECHANICAL COMPONENT LAYOUT...........................................6-1
6.1.2 PAPER PATH ...................................................................................6-2
6.2 BOARD STRUCTURE...............................................................................6-3
6.2.1 OVERVIEW ......................................................................................6-3
6.2.2 DESCRIPTIONS...............................................................................6-4
6.2.3 CONTROLLER BOARD ...................................................................6-5
6.3 PRINTING PROCESS ...............................................................................6-6
6.3.1 OVERVIEW ......................................................................................6-6
6.3.2 LASER EXPOSURE .........................................................................6-7
Overview...............................................................................................6-7
Automatic Power Control (APC) ...........................................................6-8
LD Safety Mechanisms .........................................................................6-9
6.3.3 CARTRIDGE OVERVIEW ..............................................................6-10
6.3.4 DRUM CHARGE.............................................................................6-10
6.3.5 DEVELOPMENT.............................................................................6-11
Overview.............................................................................................6-11
Toner Supply ......................................................................................6-11
Development Unit ...............................................................................6-11
Toner Density Control .........................................................................6-12
Development Bias...............................................................................6-12
Toner End Detection ...........................................................................6-13
6.3.6 IMAGE TRANSFER AND PAPER SEPARATION ..........................6-14
Overview.............................................................................................6-14
Transfer Roller Cleaning .....................................................................6-14
6.3.7 CLEANING .....................................................................................6-15
6.3.8 QUENCHING..................................................................................6-15
6.3.9 ID CHIP ..........................................................................................6-16
6.4 PAPER FEED..........................................................................................6-17
6.4.1 OVERVIEW ....................................................................................6-17
Paper Tray ..........................................................................................6-17
By-pass Tray.......................................................................................6-17
6.4.2 PAPER TRAY .................................................................................6-18
Tray Extension ....................................................................................6-18
SM iii
Rev. 12/2002
G056/G058/G073/G074