OPTIMA
SCALE
MANUFACTURING
INC.
12
8. Check if the balance meets requirements on the production notice and particular production
requirements.
9. Check if components on the packing list are complete and if their types correspond with their
serial numbers one by one.
Chapter XI: Failure and Maintenance
1. Problem: When the balance is switched on, “P FAIL” is displayed.
Failure analysis: mis-operation, failing to switch off the machine normally or pull out power
supply directly.
Solution: Press POWER to switch on and then “0.0000g" is displayed.
2.
Problem: Switch on the balance and “P FAIL” is displayed. After you press “POWER”,
the screen display is unchanged, the display is abnormal and the pressing sound is
sent out.
Failure analysis and Solution:
1) Switch on the balance again and check if the failure has been solved.
2) Z80 core is damaged and shall be replaced.
3.
Problem: “P FALI 2" is displayed after the balance is switched on.
Solution: check zero point and full scale count values.
4. Problem: “+E"/"-E" is displayed after the balance is switched on, and nothing happens when
POWER is pressed.
Failure analysis and Solution:
1) If the original part of the circuit board is damaged: replace Q3/Q4 and 1016E cores.
2) Check if there is a scale pan and if the scale pan has been overloaded.
5. Problem: “CAL NO” appears during calibration:
Failure analysis:
1) External calibration balance:
A: If a mistake happens when the weight is loaded, F1 100g standard weight shall be loaded.
B: If the zero point count value and the full load count value exceed the scope, check and
adjust these count values.
2) Internal calibration balance:
A: The weight interferes with other parts when it is loaded and cannot be loaded in place:
disassemble the upper cover plate of the balance, check the action when the weight is