Cleaning; Controlling The Drive Of The Cleaning Web - Canon iR5055 Series Service Manual

Chapter 9
<Sequence of Shutter Operation>
- At Power-On
The machine moves the shutter (round trip) between home position and small-size paper position to check shutter operation.
HP : shutter position (home position)
M : shutter position (medium-size paper position)
S : shutter position (small-size paper position)
M15 : shutter motor
PS53: shutter HP sensor
- During Copying/Printing
At time of standby, the machine sets the shutter to its home position; during copying/printing, on the other hand, the machine controls the shutter position
according to the selected paper size and the readings of the sub thermistor and the shutter thermistor. After copying/printing, the machine moves the shutter
back to its home position.
Here, the discussion is based on shutter operation when the machine is making A5R prints in continuous mode.
THM2
THM3
HP
M
S
[1] When printing starts, the readings of the sub thermistor (THM2) and the shutter thermistor (THM3) are both above specific levels (THM2/THM3 >/= 203
deg C); as a result, the machine moves the shutter to small-size paper position (S).
[2] The machine continues printing operation. Consequently, the readings of both thermistor are below specific levels (120 deg C </= THM2 < 150 deg C,
165 deg C </= THM3 < 195 deg C); as a result, the machine moves the shutter to home position.
MEMO:
The foregoing chart has been prepared to illustrate the operation of the shutter, and the
readings of the thermistor do not necessarily fluctuate as shown in the chart.

9.3.2 Cleaning

9.3.2.1 Controlling the Drive of the Cleaning Web

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The machine removes toner remaining on the fixing roller by means of cleaning web (impregnated with silicone oil) to prevent fixing offset.
The cleaning web is taken up by the takeup roller when the drive from the fixing web solenoid (SL9) reaches the web takeup roller drive gear by way of a one-way
clutch.
9-14
[1]
Power
ON
M15
HP
PS53
PRINT START
PSTBY
1st Print
Nth Print
185 186 203
185 185 201
F-9-22
WMUP
M S M HP
F-9-23
PRINT
N+1st N+2nd N+9th
Print Print Print
210 209 149
204 203 197
[1]
F-9-24
STBY
PSTBY
N+10th N+11th
Print Print
145 146
194 195
(deg C)
[2]
0015-4612