Soiled Back Side Due To Toner At Secondary Transfer External Roller; Soiled Back Side Cases Reported From Field - Canon imagePRESS C7000VP Series Trouble Shooting Information

3.3 Soiled back side due to toner at secondary transfer external roller

 Description
The following two controls have been added in order to improve toner-cleaning performance for
the secondary transfer external roller.
1. Shorten the amount of time to bias the secondary transfer external roller.
2. In order to clean the roller, add a cleaning sequence in which a black band patch is formed
during post rotation and toner is applied to the secondary transfer external roller on the
condition that the following two requirements are met.
Each counters for the secondary transfer external roller and the secondary transfer

cleaning brush roller is 5000 prints or less (in case of LTR paper)
One job is 50 prints or less (in case of LTR paper)

 Field Remedy
1. Upgrade DCON to Ver26.05, and set service mode (level 2) > COPIER > ADJUST > HV-TR
> 2ELSW > 1. (2ELSW is to switch the secondary transfer static eliminator bias to ON or
OFF, 0: OFF, 1: ON)
2. Replace the secondary transfer external roller and the secondary transfer cleaning brush
roller (2 pcs.) at the same time. Otherwise, a difference in abrasion between these two
rollers may worsen this symptom.
3. Clear these rollers' counter to 0 after replacement in the service mode below.
COPIER > Counter > DRBL-1 > 2TR-R0LL (secondary transfer external roller)

COPIER > Counter > DRBL-1 > 2TRCL-RL (secondary transfer cleaning brush roller)

* The newly added sequence will operate in sync with the counter 2TRCL-RL.

3.4 Soiled back side cases reported from field

 Case #1: Due to broken shaft of toner discharging screw
There are some reported instances from the field where this symptom was caused by a broken
shaft of the toner discharging screw of the secondary transfer external roller-cleaning unit. Thus,
check the screw shaft at the occurrence of soiled backside.
Note that it is difficult to confirm the breakage visually.
 Case #2: Due to dirty fixing feed belt
Clean the fixing feed belt.
 Case #3: Due to dirty fixing inlet guide assembly
Clean the fixing inlet guide.
 Case #4: Due to waste toner accumulated in secondary transfer cleaning
unit
Break down toner accumulation inside the unit.
Trouble Shooting Information for C7000VP series
Page 66
Rev. 2.0
2010/09/17