Canon i-SENSYS LBP5300 Series, Service Manual

Page: 58 / 150

Chapter 2
2-22
F-2-29
The movement of the transfer roller ESP and the each color's transfer rollers. The transfer roller engagement/disengagement mechanism in yellow is described
here, as the mechanism in cyan and magenta is identical. The ETB is not shown in the figure, however in fact, the ETB is placed in between the transfer roller
and the photosensitive drum.
When the transfer rollers' ESP moves rightward/leftward, the transfer roller holders will move upward/downward. Thus the transfer rollers are linked to move
according to the ESP movement.
The transfer roller ESP has three slopes; slope 1, slope 2, and slope 3. The pin on the transfer roller holder moves up and down along one of the slope, when the
transfer roller ESP moves.
Consequently, the transfer roller put in the transfer roller holder engages with or disengages from the photosensitive drum.
(a) Standard position/All four colors' transfer rollers are engaged (See "a" illustration below)
The transfer roller holders of all four colors do not move up and all four colors' transfer rollers are engaged with the photosensitive drums, as the transfer
roller ESP is at the standard position.
At full-color printing and monochrome printing with prescribed thick paper, the transfer roller ESP stays in the standard position and all four colors' transfer
rollers are engaged with the ETB.
(b) Downward position/Only black's transfer roller is engaged (See "b" illustration below)
The transfer roller holder of yellow moves up along the slope 1 and the transfer roller disengages from the photosensitive drum, as the transfer roller ESP
moves down. The same applies to cyan and magenta.
On the other hand, the black does not have the slope corresponding to the slope 1 in yellow.
Therefore the transfer roller holder does not move up and the transfer roller engages with the photosensitive drum.
At monochrome printing, the transfer roller ESP stays in the downward position and only black's transfer roller is engaged with the ETB.
(c) Upward position/All four colors' transfer rollers are disengaged (See "c" illustration below)
The yellow transfer roller holder moves up along the slope 2 and the transfer roller disengages from the photosensitive drum, as the transfer roller ESP moves
up. The same applies to cyan and magenta.
On the other hand, the black also moves up along the slope 3 and the transfer roller disengages from the photosensitive drum.
All 4 colors' transfer rollers can be disengaged from the ETB by controlling the transfer ESP stays in the upward position.
SL5011 M5
Bk cartrige
DC controller PCB
ETB MOTOR DRIVE signal
ETB ESTRANGEMENT
SOLENOID DRIVE signal
Y cartrige
C cartrige
M cartrige
Transfer roller
estrangement cam
Transfer roller
estrangement slideplate
Transfer roller