2NM/2NX/2NY/2NZ/2P0/2P6
1-4-41
7810 Short-circuited tempera-
ture sensor wire
Input from temperature sensor
is 31 or less continuously for 5
s.
Temperature
sensor
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Temperature sensor and control PWB
(YC30)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the key right PWB.
Control PWB 1. Check the control software and upgrade
to the latest, if necessary.
2. Replace the control PWB and check for
correct operation (see page 2-2-12).
7900 Drum EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated 5 times
successively.
Mismatch of reading data from
2 locations occurs 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
DR PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
DR PWB and drum connect PWB (YC1)
Drum connect PWB and connect left
PWB (YC3)
Connect left PWB and control PWB
(YC2)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Drum unit (see page 1-5-
36).
Connect left PWB
Replace the connect left PWB (see page 2-
2-12).
Control PWB 1. Check the control software and upgrade
to the latest, if necessary.
2. Replace the control PWB and check for
correct operation (see page 2-2-12).
F000 Communication error
between Control PWB and
Operation PWB
Control PWB
1. Turn the main power swtch off and after
5 seconds, then turn power on.
2. Check that the wirings and connetors
between the control PWB and the
operation panel PWB are normal.
Operation PWB and control PWB
(YC2002)
3. Check that the DIMM memories in the
control PWB are well conducted and, if
not, replace.
4. Execute U021initialize memory. (see
page 1-3-22)
5. Replace the control PWB.
Operation PWB Replace the operation PWB (see page 2-2-
56).
Code Contents Related parts
Check procedures/
corrective measures
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General
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