Canon imageRUNNER ADVANCE 9070 PRO series Service Manual Digest page 63

E Detailed Occurance Items
code code area
E020 -02A2 -05 Title Toner density sensor (M) output upper limit error
Description The toner density sensor output (Vsig_ind) is less than
of detection 247.
Measures 1. Check the connection between the toner density sensor
and the DC controller interface PCB. (Connector,
Breaking (shorting))
<Y> sensor side: J7133, J8028, J8087 PCB side:
J1240, J8085
<M> sensor side: J7134, J8029, J8088 PCB side:
J1240, J8085
<C> sensor side: J7135, J8030, J8089 PCB side:
J1240, J8086
<Bk> sensor side: J7146, J8015, J8117 PCB side:
J1240, J8086
2. Check whether disconnection or shorting of the toner
density sensor occurs or not.
3. Replace the developing assembly.
E020 -02C2 -05 Title Patch (Y) sampling error
Description The variation before average patch P wave light intensity
of detection is more than 100.
Measures 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, Breaking
(shorting))
Sensor side: J7412, J8035 PCB side: J1242
4. Clean or replace the ITB.
5. Replace the patch sensor unit.
6. Replace the developing assembly. (Check whether
there is not uneven coating on the developing sleeve.)
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.
E Detailed Occurance Items
code code area
E020 -0320 -05 Title Initial installation toner density sensor (C) output lower
limit error
Description When executing the developing assembly initial
of detection installation mode (COPIER> FUNCTION> INSTALL>
INISET-C), the output level does not reach 128 even
when control voltage of the toner density sensor reached
255 or more.
Measures 1. Check the connection between the toner density sensor
and the DC controller interface PCB. (Connector,
Breaking (Breaking (shorting)))
<Y> sensor side: J7133, J8028, J8087 PCB side:
J1240, J8085
<M> sensor side: J7134, J8029, J8088 PCB side:
J1240, J8085
<C> sensor side: J7135, J8030, J8089 PCB side:
J1240, J8086
<Bk> sensor side: J7146, J8015, J8117 PCB side:
J1240, J8086
2. Check whether the toner density sensor is not
disconnected or Breaking (Breaking (shorting)) occurs.
3. Replace the developing assembly.
Description
3
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