Panasonic DP-C321 Service Handbook page 108

3-34
Y N
Check the wire between the MCU PWB J402-4 and the
LSU (ROS) ASSY Relay Connector J518-3 for an open
circuit and poor contact. If no problems are found, replace
the PWB. (PL13.1)
Check the wire between the MCU PWB J402-4 and the LSU
(ROS) ASSY Relay Connector J518-3 for an open circuit and
poor contact.
Run DC330 [006-031].
Is the frequency between the MCU PWB J402-2 (+) and GND
(-) 2 KHz to 2.5 KHz?
Y N
Check the wire between the MCU PWB J402-2 and the
LSU (ROS) ASSY Relay Connector J518-5 for an open
circuit and poor contact. If no problems are found, replace
the PWB. (PL13.1)
Check the wire between the MCU PWB J402-2 and the LSU
(ROS) ASSY Relay Connector J518-5 for an open circuit and
poor contact.
Check the wiring status of the Harness in the LSU (ROS)
ASSY. If no problems are found, replace the LSU (ROS)
ASSY. (PL3.1)
006-380 LSU (ROS) SOS LENGTH FAILURE Y
Description The interval of the LSU (ROS) SOS (Y) signals
exceeds the specified value.
BSD on : CH6.5 CH6.12C
Procedure
Is +5 VDC measured between the MCU PWB J401-B20 (+) and
GND (-)?
Y N
Replace the MCU PWB. (PL13.1)
Check the wire between the SOS PWB (Y) J516-1 and the
MCU PWB J401 for an open circuit and poor contact.
Check the wire between the LD Drive (Y) J529 and the MCU
PWB J401 for an open circuit and poor contact.
If no problems are found, replace the following parts in
sequence:
• LSU (ROS) Assembly (PL3.1)
• MCU PWB (PL13.1)
006-381 LSU (ROS) SOS LENGTH FAILURE M
Description The interval of the LSU (ROS) SOS (M) signals
exceeds the specified value.
BSD on : CH6.6 CH6.12C
Procedure
Is +5 VDC measured between the MCU PWB J401-B20 (+) and
GND (-)?
Y N
Replace the MCU PWB. (PL13.1)
Check the wire between the SOS PWB (M) J517-1 and the
MCU PWB J401 for an open circuit and poor contact.
Check the wire between the LD Drive M J528 and the MCU
PWB J401 for an open circuit and poor contact.
If no problems are found, replace the following parts in
sequence:
• LSU (ROS) Assembly (PL3.1)
• MCU PWB (PL13.1)
Chapter 3 Troubleshooting
006-382 LSU (ROS) SOS LENGTH FAILURE C
Description The interval of the LSU (ROS) SOS (C) signals
exceeds the specified value.
BSD on : CH6.7 CH6.12C
Procedure
Is +5 VDC measured between the MCU PWB J401-B20 (+) and
GND (-)?
Y N
Replace the MCU PWB. (PL13.1)
Check the wire between the SOS PWB (C) J514-1 and the
MCU PWB J401 for an open circuit and poor contact.
Check the wire between the LD Drive C J527 and the MCU
PWB J401 for an open circuit and poor contact.
If no problems are found, replace the following parts in
sequence:
• LSU (ROS) Assembly (PL3.1)
• MCU PWB (PL13.1)
006-383 LSU (ROS) SOS LENGTH FAILURE K
Description The interval of the LSU (ROS) SOS (K) signals
exceeds the specified value.
BSD on : CH6.8 CH6.12C
Procedure
Is +5 VDC measured between the MCU PWB J401-B20 (+) and
GND (-)?
Y N
Replace the MCU PWB. (PL13.1)
Check the wire between the SOS PWB (K) J515-1 and the
MCU PWB J401 for an open circuit and poor contact.
Check the wire between the LD Drive K J526 and the MCU
PWB J401 for an open circuit and poor contact.
If no problems are found, replace the following parts in
sequence:
• LSU (ROS) Assembly (PL3.1)
• MCU PWB (PL13.1)