Canon imageRUNNER ADVANCE 9070 PRO series Service Manual Digest page 55

■ E020
E Detailed Occurance Items
code code area
E020 -0080 -05 Title ITB base light intensity upper limit error
Description When executing ITB base correction, the average value
of detection of P wave light intensity detected/calculated is more than
900.
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. Clean the patch sensor.
2. Check the connection between the patch sensor and
the DC controller interface PCB. (Connector, Shorting)
Sensor side: J7412, J8035 PCB side: J1242
3. Check open/close operation of the patch shutter.
4. Check whether scratches/dirt are applied to the ITB.
If many scratches are found, replace the ITB. If dirt
is applied, clean the ITB. In this case, check the ITB
cleaning blade at the same time.
5. Replace the patch sensor unit.
E020 -0081 -05 Title ITB base light intensity lower limit error
Description When executing ITB base correction, the average value
of detection of P wave light intensity detected/calculated is less than
300.
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. Clean the patch sensor.
2. Check the connection between the patch sensor and
the DC controller interface PCB. (Connector, Shorting)
Sensor side: J7412, J8035 PCB side: J1242
3. Check open/close operation of the patch shutter.
4. Check whether scratches/dirt are applied to the ITB.
If many scratches are found, replace the ITB. If dirt
is applied, clean the ITB. In this case, check the ITB
cleaning blade at the same time.
5. Replace the patch sensor unit.
Description
E Detailed Occurance Items
code code area
E020 -0082 -05 Title Patch sensor light intensity correction error
Description When executing correction of patch sensor light intensity,
of detection the P wave output is not more than 500 and less than
900.
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. Clean the patch sensor.
2. Check the connection between the patch sensor and
the DC controller interface PCB. (Connector, Shorting)
Sensor side: J7412, J8035 PCB side: J1242
3. Check open/close operation of the patch shutter.
4. Check whether scratches/dirt are applied to the ITB.
If many scratches are found, replace the ITB. If dirt
is applied, clean the ITB. In this case, check the ITB
cleaning blade at the same time.
5. Replace the patch sensor unit.
E020 -0120 -05 Title Initial installation toner density sensor (Y) output lower
limit error
Description When executing the developing assembly initial
of detection installation mode (COPIER> FUNCTION> INSTALL>
INISET-Y), 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
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