Kyocera Copystar CS 3011i Service Manual page 330

Code Contents
7810 Short-circuited external
thermistor wire
The temperature sensor input
sampling is less than 11.
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
Thermistor PWB
Engine PWB
Drum unit
Engine PWB
Developer unit
Engine PWB
1-4-37
Check procedures/
corrective measures
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Thermistor PWB and Engine PWB
(YC6)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the thermistor PWB.
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
59).
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 (YC12)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Drum unit (see page 1-5-
21).
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
59).
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 (YC11)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Developer unit (see page 1-
5-18).
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
59).
2RG/2RH