Canon imageRUNNER ADVANCE 9070 PRO series Service Manual Digest page 68

E Detailed Occurance Items
code code area
E020 -0424 -05 Title
Description
of detection
Measures
3
3-42
Description
Initial installation patch (Bk) density lower limit error
When executing the developing assembly initial
installation mode (COPIER> FUNCTION> INSTALL>
INISET-K), the ATR patch detection value (SigD) is less
than 79.
• When the value of COPIER> DISPLAY> DENS>
P-LED-DA is large (153(D) or more) and the value of
P-SENS-P is small, there is a high possibility that dirt is
applied to the patch sensor.
• This occurs only at a regular timing. When the value
of COPIER> DISPLAY> DENS> DENS-S-x is small
(2 digits), there is a high possibility that breaking
occurred.
1. Check whether the developing assembly and the drum
unit are properly installed.
2. Clean the patch sensor.
3. Check the connection between the patch sensor and
the DC controller interface PCB. (Connector, Shorting)
Sensor side: J7412, J8035 PCB side: J1242
4. Check open/close operation of the patch shutter.
5. Clean or replace the ITB.
• Check whether the ITB belt is dirty or not. If it
is dirty, perform cleaning with the service mode
(COPIER> FUNCTION> CLEANING> TBLT-
CLN).
• If it is assumed that this error occurred due to
scratches on the ITB, replace the ITB.
6. Replace the patch sensor unit.
7. Replace the developing assembly.
E Detailed Occurance Items
code code area
E020 -0434 -05 Title Initial installation patch (Bk) density upper limit error
Description When executing developing assembly initial installation
of detection mode (COPIER> FUNCTION> INSTALL> INISET-K), the
ATR patch output (SigD) is more than 970.
Measures • When the value of COPIER> DISPLAY> DENS>
P-LED-DA is large (153(D) or more) and the value of
P-SENS-P is small, there is a high possibility that dirt is
applied to the patch sensor.
• This occurs only at a regular timing. When the value
of COPIER> DISPLAY> DENS> DENS-S-x is small
(2 digits), there is a high possibility that breaking
occurred.
1. Check whether the developing assembly and the drum
unit are properly installed.
2. Clean the patch sensor.
3. Check the connection between the patch sensor and
the DC controller interface PCB. (Connector, Shorting)
Sensor side: J7412, J8035 PCB side: J1242
4. Check open/close operation of the patch shutter.
5. Clean or replace the ITB.
6. Replace the patch sensor unit.
7. Replace the developing assembly.
Description
• Check whether the ITB belt is dirty or not. If it
is dirty, perform cleaning with the service mode
(COPIER> FUNCTION> CLEANING> TBLT-
CLN).
• If it is assumed that this error occurred due to
scratches on the ITB, replace the ITB.