User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–100
Transfer Drum and Peripherals
Outline The transfer drum is the mechanism that enables multiple-pass printing.
It clamps the leading edge of the paper by means of a solenoid-actuated
gripper, attracts and holds the paper to its surface, and then carries the
paper past the photosensitive drum where toner transfer occurs. In full-
color mode, toner transfer occurs four times per page, while in the
monochrome mode transfer occurs once.
The transfer drum is surrounded by the attraction roller, the photosensi-
tive drum, the discharge roller, the cleaning brush, and the separation
claw. These components are controlled by the mechanical controller.
DC Controller Board
Mechanical Controller Board
SL4
SL5
PS6
PS8
Gripper
Discharge
Roller
Attraction
Roller
Cleaning
brush
PS7
M5
M2
SL6
SL9
SL8
Photo-
sensitive
Drum
M4
Transfer Drum Top Sensor Signal
(TOPREG)
Separation Sensor Signal (SEPSNS)
Attraction Sensor Signal (ATTSNS)
Gripper Drive Signal (GRIPON)
Separation Claw Drive
Signal (SEPON)
Drum Motor Drive Signal
Attraction Roller Press Signal (/ATTSLON)
Discharge Roller Press Signal (/DCSLON)
Cleaning Brush Motor
Drive Signal
Transfer Drum Cleaner Press Signal
(/TDCSLON)
Separation Claw
Transfer Drum
Cleaning Brush
Press Cam
Discharge Roller
Press Cam
Attraction Roller
Press Cam