Itb Cleaning Control; Secondary Transfer Outer Roller Cleaning Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

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ITB cleaning control

To remove residual toner on the ITB
Control description
1) The ITB cleaning blade scrapes toner on the ITB.
2) Scraped toner is fed to the waste toner case by the waste toner feeding screw.
Waste toner
feeding screw
ITB cleaning blade
2
ITB motor
M13
Drive roller
(steering roller)
F-2-92 F-2-92

Secondary transfer outer roller cleaning control

To prevent soil on the back of the sheet caused by soil on the secondary transfer outer roller
Execution timing
1) At warm-up rotation (fixing temperature is less than 50 deg C, jam recovery)
2) At the post-rotation
3) After executing image stabilization control (creating patch image on the ITB)
Control description
The secondary transfer bias (see Note 1), which has been generated by HVT3 (UN18), is
applied to the secondary transfer outer roller.
Residual toner on the secondary transfer outer roller is attached to the ITB, and then collected
by the ITB cleaning unit.
Caution:
Both positive bias and negative bias are applied:
Because of polarized-charged (positive and negative) residual toner, both types of
residual toner need to be removed.
Therefore, positively-charged bias is applied on the 1st cycle of ITB while negatively-
charged bias is applied on the 2nd cycle of ITB.
ITB cleaning blade
Waste toner
feeding screw
Drive roller
(steering roller)
Related Service Mode
Forced execution of the secondary transfer outer roller cleaning
COPIER > FUNCTION > CLEANING > 2TR-CLN
2-57
Cleaning bias2
Secondary transfer
outer roller
F-2-93 F-2-93
2-57