Chapter 6 Troubleshooting
AC-4000H Service Manual No. 085-7323-08
6-4
6.2
Symptom, Cause, And Measures
Symptom
Power is not applied.
Turning on power
enters test mode.
No further process
after display check
Weighing margin
occurs. (Flickering)
Specific segment does
not light.
A key is not entered.
Registered data
changes.
All the display goes
off.
Print is not carried out.
Measures
1. Insert the power plug.
2. Replace with a new fuse.
3. Replace with a new PK-950B.
4. Replace with a new PB-LSF150-S.
5. Replace with a new power switch.
1. Replace with a new PK-950B.
2. Replace with a new keyboard switch.
1. Loading cell adjustment and exchange
2. Confirmation and transfer of installa-
tion location
3. Replace with a new PK-229A.
4. Replace with a new PK-950B.
5. Replace with a new PB-LSF150-S.
1. The four corners limit screw is ad-
justed
2. Removal of foreign body
3. Replace with a new PK-229A.
4. Adjustment and exchange of load cell
5. Replace with a new PK-950B.
1. The connector connection is con-
firmed.
2. Replace with a new PK-950B.
3. Replace with a new display board.
1. Replace with a new key sheet.
2. The connector connection is con-
firmed.
1. Replace with a new battery.
2. Replace with a new PK-950B.
3. The installation location is confirmed
and transferred.
1. The power-supply voltage is confirmed.
2. Replace with a new PB-LSF150-S.
3. Replace with a new display board.
4. Replace with a new PK-950B.
1. Confirmation of cable
2. Head sign acceptable voltage confir-
mation PB-LSF150-S exchange
3. Thermal head adjustment and ex-
change
4. Replace with a new PK-950B.
Cause
1. Power plug has come off.
2. Fuse burns.
3. Defect of main board (PK-950B)
4. Defect of power supply unit (PB-
LSF150-S)
5. Defect of power switch
1. Defect of PK-950B
2. Defect of keyboard switch
1. Defect of load cell
2. Vibration from the outside.
3. Defect of A/D board (PK-229A)
4. Defect of main board (PK-950B)
5. Defect of power supply unit (PB-
LSF150-S)
1. Four corners limit screw comes in
contact.
2. Foreign obstacle under the load cell.
3. Defect of A/D board (PK-229A)
4. Defect of load cell
5. Defect of main board (PK-950B)
1. The connection is abnormal of the
connector.
2. Defect of main board (PK-950B)
3. Defect of display board
1. Defect of key sheet
2. Improper connection of connector
1. Defect of battery
2. Defect of main board (PK-950B)
3. Noise from the outside or influence
of static electricity
1. Voltage fluctuation
2. Defect of power supply unit (PB-
LSF150-S)
3. Defect of display board
4. Defect of main board (PK-950B)
1. Abnormality of thermal head cable
2. Defect of power supply unit (PB-
LSF150-S)
3. Defect of thermal head
4. Defect of main board (PK-950B)