7901 Drum Eeprom Error; 7911 Developer Unit Eeprom Error - Kyocera TASKalfa 3510i Service Manual

Code Contents
7901 Drum EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
7911 Developer unit EEPROM
error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
Related parts
Drum unit
Engine PWB
Developer unit
Engine PWB
1-4-40
Check procedures/
corrective measures
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Durm unit and Drum relay PWB (YC2)
Drum relay PWB (YC1) and Engine
PWB (YC20)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Drum unit (see page 1-5-
16).
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
44).
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit and developer relay
PWB (YC1)
Developer relay PWB (YC2) and Engine
PWB (YC21)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Developer unit (see page 1-
5-13).
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
44).
2NL/2P8