Panasonic DP-C321 Service Handbook page 109

006-385 LSU (ROS) ASIC FAILURE
Description Operation failure of the LSU (ROS) ASIC in the
MCU PWB.
BSD on : CH6.5 CH6.12C
Procedure
If the problem persists after turning the power On/Off, replace
the MCU PWB. (PL13.1)
006-389 CARRIAGE OVER RUN FAILURE
(SCAN END side)
Description The CRG has overrun at the Scan End.
BSD on : CH6.4 CH6.12A
Procedure
Turn Off the power. Remove the PLATEN GLASS. Manually
move the Full Rate Carriage. Does the Carriage move without
any load?
Y N
Clear the CARRIAGE CABLE distortion, stranding,
damage and foreign substance on the CARRIAGE RAIL
etc, causing the load.
Turn On the power. Enter DC330 [006-212] and turn it On.
Manually move the Full Rate Carriage and turn the IIT REGI
SENSOR On/Off. Is the display switched between H and L?
Y N
Repair the IIT REGI SENSOR using 3.3.3.2 Generic
Permeable Sensor Failure FIP.
Enter DC330 [06-005] (SCAN) or DC330 [06-006] (RETURN)
and turn it On. Does the CARRIAGE MOTOR operate?
Y N
Is +24 VDC measured between the IIT/IPS PWB J725-2
(+) and GND (-)?
Y N
Visually check the F6 Fuse on the IIT/IPS PWB.
Has the Fuse gone off?
Y N
Turn Off the power. Disconnect the IIT LVPS
J702 and turn the power On.
3-35
Is +24 VDC measured between the IIT LVPS
J702-1 (+) and GND (-)?
Y N
Check the power (ACH) to the IIT LVPS.
If no problems are found, replace the IIT
LVPS. (PL16.4)
The possible reason for this failure is the short
circuit/open circuit of the J702 and onwards of
the IIT LVPS. Check for a short circuit by
referring to Chapter 4 Wiring Data. (WN4.3.25
IIT+24 VDC)
Replace the IIT/IPS PWB. (PL16.3)
When DC330 [006-005] (SCAN) or DC330 [006-006]
(RETURN) is On, is +24 VDC measured between the
CARRIAGE MOTOR P739-1 (+) and GND (-)?
Y N
In the same Diag, is +24 VDC measured between the
IIT/IPS PWB J725-1 (+) and GND (-)?
Y N
Replace the IIT/IPS PWB. (PL16.3)
Check the wire between the IIT/IPS PWB J725-1~6
and the CARRIAGE MOTOR P739-1~6 for an open
circuit or poor contact.
Check the wire between the IIT/IPS PWB J725 and the
CARRIAGE MOTOR P739-5 for an open circuit or poor
contact. If no problems are found, replace the
CARRIAGE MOTOR (PL16.5) and IIT/IPS PWB
(PL16.3) in sequence.
Check the following:
• The CARRIAGE MOTOR BELT for damage, slackening
and disengagement
• The CARRIAGE CAPSTAN SHAFT/PULLEY for wear,
distortion and chips
• Full Rate/Half Rate Carriage Position Adjustment
(ADJ2.1.1)
If no problems are found, replace the IIT/IPS PWB (PL16.3).
006-390 CARRIAGE OVER RUN FAILURE (HOME
side)
Description The CRG has overrun at the Home End.
BSD on : CH6.4 CH6.12A
Procedure
Turn Off the power. Remove the PLATEN GLASS.
Manually move the Full Rate Carriage.
Does the Carriage move without any load?
Y N
Clear the CARRIAGE CABLE distortion, stranding,
damage and foreign substance on the CARRIAGE RAIL
etc, causing the load.
Turn On the power. Enter DC330 [006-212] and turn it On.
Manually move the Full Rate Carriage and turn the IIT REGI
SENSOR On/Off.
Is the display switched between H and L?
Y N
Repair the IIT REGI SENSOR using 3.3.3.2 Generic
Permeable Sensor Failure FIP.
Enter DC330 [06-005] (SCAN) or DC330 [06-006] (RETURN)
and turn it On.
Does the CARRIAGE MOTOR operate?
Y N
Is +24 VDC measured between the IIT/IPS PWB J725-2
(+) and GND (-)?
Y N
Visually check the F6 Fuse on the IIT/IPS PWB.
Has the Fuse gone off?
Y N
Turn OFF the power. Disconnect the IIT LVPS
J702 and turn the power On.
Is +24 VDC measured between the IIT LVPS
J702-1 (+) and GND (-)?
Y N
Check the power (ACH) to the IIT LVPS.
If no problems are found, replace the IIT
LVPS. (PL16.4)
Chapter 3 Troubleshooting