Fuser Assy Change Soon; Fuser Assy End Of Life - Panasonic DP-C321 Service Handbook

3-72
Is +24 VDC measured between the LVPS FAN J214-4 (+)
and J214-1 (-)?
Y N
Check the DC COM circuit to LVPS FAN J214-1 by
referring to Chapter 4 Wiring Data.
(WN4.3.17 +24 VRET-1) (WN4.3.18 +24 VRET-2)
(WN4.3.19 +24 VRET-3) (WN4.3.20 +24 VRET-4)
Run DC330 [004-050].
Is 0 VDC measured between the LVPS FAN J214-3 (+)
and GND (-)?
Y N
Run DC330 [004-050].
Is 0 VDC measured between the MCU PWB J406-
B12 (+) and GND (-)?
Y N
Check the wire between the LVPS FAN J214-3
and the MCU PWB J406-B12 for an open circuit
and poor contact. If no problems are found,
replace the MCU PWB. (PL13.1)
Check the wire between the LVPS FAN J214-3 and
the MCU PWB J406-B12 for an open circuit and poor
contact.
Replace the LVPS FAN. (PL9.1)
Run DC330 [004-050].
Is +3.3 VDC measured between the LVPS FAN J214-2 (+) and
GND (-)?
Y N
Run DC330 [004-050].
Is +3.3 VDC measured between the MCU PWB J406-B13
(+) and GND (-)?
Y N
Replace the MCU PWB. (PL13.1)
Check the wire between the MCU PWB J406-B13 and the
LVPS FAN J214-2 for an open circuit and poor contact.
Replace the LVPS FAN. (PL9.1)
Procedure (for REAR FAN)
Run DC330 [004-050].
Is the REAR FAN revolving?
Y N
Is +24 VDC measured between the I/F PWB J552-1 (+)
and GND (-)?
Y N
Check the +24 VDC circuit 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)
Check the DC COM circuit by referring to Chapter 4
Wiring Data.
(WN4.3.17 +24 VRET-1) (WN4.3.18 +24 VRET-2)
(WN4.3.19 +24 VRET-3) (WN4.3.20 +24 VRET-4)
Replace the REAR FAN. (PL8.1)
Run DC330 [004-050].
Is +3.3 VDC measured between the I/F PWB J552-3 (+) and
GND (-)?
Y N
Replace the following parts:
• I/F PWB (PL9.1)
• MCU PWB (PL13.1)
Replace the REAR FAN. (PL8.1)
Chapter 3 Troubleshooting

010-420 FUSER ASSY CHANGE SOON

Description The FUSER ASSY needs to be replaced soon.
BSD on : CH10.8
Procedure
Was the [Replace] button pressed?
Y N
Press the [Replace] button.
Run the DC135 [954-804].
Is the initial value 0?
Y N
Replace the MCU PWB. (PL13.1)
After confirming that the LIFE setting value is 10000, turn
power On/Off.
If the problem persists, replace the MCU PWB. (PL13.1)

010-421 FUSER ASSY END OF LIFE

Description It is time to replace the FUSER ASSY.
BSD on : CH10.8
Procedure
Was the [Replace] button pressed?
Y N
Press the [Replace] button.
Run the DC135 [954-804].
Is the initial value 0?
Y N
Replace the MCU PWB. (PL13.1)
After confirming that the LIFE setting value is 10000, turn
power On/Off.
If the problem persists, replace the MCU PWB. (PL13.1)