05/2014
2-129
DC SC2020
Troubleshooting
2.2.4 Common FIP
Version 1.1
CF-001 ADC Sensor Fail
BSD-ON:CH9.8
ADC Sensor malfunction, abnormality in electrical system, or abnormality in Transfer Belt reflection out-
put has occurred.
• 092-651: ADC Sensor System Fail (Shutdown Fail)
• 092-652: ADC Sensor Fail
Influence
When 092-652Fail occurs, image density control that uses ADC Sensor will not be updated which may
create issues concerning the image density being too dark or too light.092-651Fail discharges images
under the process of image formation and force stop the machine operation when 092-652Fail continu-
ously occurs.Couple copies of print may be printout after releasing Fail by Powering OFF/ON but if the
number of 092-651Fail reaches the prescribed number of time, it will not be able to release by powering
OFF/ON.The following NVM value need to be cleared [0] in order to release. However, if it does not
recover to normal state, the Fail will generate again during usage.
Replacement parts list
Procedure
NOTE: To prevent light-induced fatigue, cover the Drum with a black sheet when removing the Drum. In
addition, do not touch the Drum surface.
When the exchange display of Drum or Deve Housing Assembly comes out in UI, when the exchange
display doesn’t come out after exchanging, it is just as it is. It executes the following operation in turn.
Tools>Admin Setting>Maintenance>Auto Registration
Tools>Admin Setting>Maintenance>Quick Density Adjust (Twice)
Didn't Fail occur?
YN
Check to see if the following NVM value is within the range regarding NVM Read/Write in CE Mode.
• NVM[755-126] (ADC_Vdark) (Range:0-100)
• NVM[755-127] (ADC_Vcln_All Mean Value) (Range:50-1000)
Are both value within the range?
YN
Check the following connections for open circuits, short circuits, and poor contacts.
• Between MOB ADC Sensor (R-RAD) J112 and DRIVE PWB J414
• Between MOB ADC Sensor (R-RAD LOW) J113 and DRIVE PWB J414
Is the conduction normal?
YN
Reconnect the connector. If it does not recover, there is a possibility of abnormality in
electrical system. Replace DRIVE PWB. (PL 18.2)
Possibility of ADC Sensor malfunction. Replace MOB ADC Assembly. (PL 6.1)
NOTE: Perform Auto Registration from UI-Diag if MOB ADC Sensor Assembly is replaced.
Pull out the IBT Unit and check the IBT Belt status. Is there any uncleanness or scratch?
YN
Possibility of cause may be contamination or scratch of IBT Belt. Replace the IBT Belt. (PL 6.3)
NOTE: Perform Auto Registration from UI-Diag if IBT Belt is replaced.
Remove the MOB ADC Assembly, check the status of ADC Sensor Detection surface and clean if it
is dirty.
If it is not dirty or does not restore after cleaning, replace the MOB ADC Assembly. (PL 6.1)
NOTE: Perform Auto Registration from UI-Diag if MOB ADC Sensor Assembly is replaced.
The ending
NOTE: Perform Auto Registration from UI-Diag if MOB ADC Sensor Assembly or IBT Belt is replaced.
Table 1 Table 1
ADC Sensor System Fail Number of continuous ADC Sensor System Fail
NVM:755-001 NVM:752-431
Table 2 Table 1
No. Component
Possibilit
y Reason
1 MOB ADC Sensor Assembly H ADC Sensor malfunction
2 Deve Housing Assenbly M When the exchange display comes out in UI,
exchange.
3 Drum M When the exchange display comes out in UI,
exchange.
4 DRIVE PWB L Abnormality in ADC Sensor electrical system.
5 IBT Belt L Abnormality in reflection output due to unclean-
ness, scratch of IBT Belt.
6 ESS PWB L Abnormality in electrical system.
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