Panasonic DP-C321 Service Handbook page 97

004-362 IOT NVM R/W FAILURE
Description The result was NG at the MCU PWB NVM R/W.
BSD on : CH3.1A CH3.4 CH3.6A
Procedure
Check the connection between the MCU PWB and the MCU
MF NVM PWB if the problem persists after turning the power
On/Off.
If no problems are found, replace the MCU PWB.(PL13.1)
If the problem persists, replace the MCU MF NVM
PWB.(PL13.1)
004-363 DRUM MOTOR K DRIVE FAILURE
Description The change of the port status at the failure of the
DRUM MOTOR is always monitored.
1. The MOTOR failure occurs when the out-of-step outputs
are detected 5 times continuously (sampling interval is
100 msec). (Common among B/W, Color, and Half
Speed)
2. The system does not detect (count) the out-of-step
outputs for 800 msec. after the motor is turned On.
However, if in the B/W mode, the system does not detect
(count) the out-of-step outputs for 1 sec.
BSD on : CH9.2CH9.31A
Procedure
Remove the K DRUM.
Enter DC330 [004-006] and turn it On.
Is the DRUM MOTOR K rotating?
Y N
Is +5 VDC measured between the DRUM MOTOR K
J235-4 (+) and GND (-)?
Y N
Check the +5 VDC circuit to the DRUM MOTOR K
J235-4 by referring to Chapter 4 Wiring Data.
(WN4.3.5 +5 VDC-1) (WN4.3.6 +5 VDC-2)
(WN4.3.7 +5 VDC-3) (WN4.3.8 +5 VDC-4)
Is +24 VDC measured between the DRUM MOTOR K
J235-1 (+) and GND (-)?
3-23
Y N
Check the +24 VDC circuit to the DRUM MOTOR K
J235-1 by referring to Chapter 4 Wiring Data.
(WN4.3.13 +24 VDC-1) (WN4.3.14 +24 VDC-2)
(WN4.3.15 +24 VDC-3) (WN4.3.16 +24 VDC-4)
Run DC330 [004-006].
Is 0 VDC measured between the DRUM MOTOR K J235-
5 (+) and GND (-)?
Y N
With DC330 [004-006] running
Is 0 VDC measured between the I/F PWB J534-A11
(+) and GND (-)?
Y N
Check the connection of the connectors P410/
J410 between the MCU PWB and the I/F PWB.
If no problems are found, replace the MCU
PWB (PL13.1) and the I/F PWB (PL9.1) in
sequence.
Check the wire between the I/F PWB J534-A11 and
the DRUM MOTOR K J235-5 for an open circuit and
poor contact.
With DC330 [004-006] running
Is the frequency between the DRUM MOTOR K J235-8
(+) and GND (-) approx. 0.7 KHz to 1.0 KHz?
Y N
Is the frequency between the I/F PWB J534-A8 (+)
and GND (-) approx. 1 KHz to 1.3 KHz?
Y N
Check the connection of the connectors P410/
J410 between the MCU PWB and the I/F PWB.
If no problems are found, replace the MCU
PWB (PL13.1) and the I/F PWB (PL9.1) in
sequence.
Check the wire between the I/F PWB J534-A8 and
the DRUM MOTOR K J235-8 for an open circuit and
poor contact.
Check conductivity of the following:
• Between the I/F PWB J534-A10 and the DRUM
MOTOR K J235-6
• Between the I/F PWB J534-A9 and the DRUM
MOTOR K J235-7
If no problems are found, replace the DRUM MOTOR K.
(PL1.1)
Run DC330 [004-006].
Is +5 VDC measured between the I/F PWB J534-A7 (+) and
GND (-)?
Y N
Check the connection of the connectors P410/J410
between the MCU PWB and the I/F PWB. If no problems
are found, replace the MCU PWB (PL13.1) and the I/F
PWB (PL9.1) in sequence.
Run DC330 [004-006].
Is +5 VDC measured between the DRUM MOTOR K J235-9
(+) and GND (-)?
Y N
Check the wire between the DRUM MOTOR K J235-9
and the I/F PWB J534-A7 for an open circuit and poor
contact.
Check if there is load on the K DRUM. If no problems are
found, replace the DRUM MOTOR K.(PL1.1)
Chapter 3 Troubleshooting