Panasonic DP-C321 Service Handbook page 192

3-118
Check the wire to the applicable component for an open circuit
or poor contact 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)
3. 3. 2. 4 +24 VDC POWER (+24V LVPS)
Procedure
Is +24 VDC measured between the +24V LVPS J502-1 (+) and
GND (-)?
Y N
Is 120 VAC measured between the +24V LVPS J2-3 (+)
and J2-4 (-)?
Y N
Go to the AC POWER FIP (IOT).
Is +5 VDC measured between the +24V LVPS J505-3 (+)
and GND (-)?
Y N
Is +5 VDC measured between the I/F PWB J534-B4
(+) and GND (-)?
Y N
Is +5 VDC measured between the MCU PWB
J400-5 (+) and GND (-)?
Y N
Check the +5 VDC circuit to the MCU
PWB J400-5 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)
Check the wire between the ESS PWB, the I/F
PWB, and the MCU PWB. If no problems are
found, replace the ESS PWB. (PL13.1)
Check the wire between the I/F PWB J534-B4 and the
+24V LVPS J505-3 for an open circuit and poor
contact.
Turn Off the power switch and remove the J502.
Turn On the power after 10sec or more passes.
Is +24 VDC measured between the +24V LVPS P502-1
(+) and GND (-)?
Y N
Replace the +24V LVPS. (PL9.1)
Check the +24 VDC circuit for a short circuit to a frame 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 wire to the applicable component for an open circuit
or poor contact 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)
3. 3. 2. 5 +24 VDC POWER (IIT LVPS)
Procedure
Turn On the power.
Is +24 VDC measured between the IIT LVPS J702-1 (+) and
GND (-)?
Y N
120 VAC measured between the IIT LVPS P700-4 (+) and
P700-3 (-)?
Y N
Go to the AC POWER FIP.
Is +5 VDC measured between the IIT LVPS J705-4 (+)
and GND (-)?
Y N
Check the +5 VDC circuit to the IIT LVPS J705-4 by
referring to the BSD CH1.6.
Is +5 VDC measured between the IIT LVPS J705-3 (+)
and GND (-)?
Y N
Is +5 VDC measured between the IIT/IPS PWB J725-
7 (+) and GND (-)?
Chapter 3 Troubleshooting
Y N
Check the wire between the ESS PWB J344 and
the IIT/IPS PWB J727.
found, replace the ESS PWB.
Check the wire between the IIT/IPS PWB J725-7 and
the IIT LVPS J705-3 for an open circuit or poor contact.
Replace the IIT LVPS. (PL16.4)
Check the wire to the appropriate part for an open circuit or
poor contact.
If no problems are