Trouble Shooting Table - KERN EW Service Manual

3.2 Trouble shooting Table

Symptoms
No display lights on.
u-Err o-Err
or
appears self test of
segments.
Display dose not get
settled down.
Display dose not repeat
correctly.
Zero point drifts.
o-Err
appears
with a net load less than
specified capacity (F.S.
+9d).
Span is out of specified
range.
Linearity is out of
specified range.
1. AJDP board is defective.
2. AC adapter is defective.
3. Wrong connection of connection cords inside.
4. Built-in battery (option) is discharged.
1. Wrong weighing pan is applied.
2. Tuning-fork sensor or mechanism unit is defective.
3. AJDP board is defective.
4. Setting of address data has mistake.
5. Coefficient memories (address data) have changed
by noises or static electricity. Adjust linearity.
1. Some parts such as stopper touches others.
2. Weighing pan touches other parts.
3. Foreign substance is in the scale.
4. Tuning-fork sensor or mechanism unit is defective.
5. Affected by a wind or disturbing oscillation. Check
environment or working base. Check also setting of
stabilization time. See operation manual.
1. Gross weight applied to the scale pan (net weight +
tare value) exceeds the scale capacity.
2. Coefficient memories (address data) have changed
by noises or static electricity. Adjust linearity.
3. Setting of address data has mistake.
4. Calibration weight is not correct.
1. Tuning-fork sensor or mechanism unit is defective.
2. AJDP board is defective.
3. Setting of address data has mistake.
4. Coefficient memories (address data) have changed
by noises or static electricity.
1. Tuning-fork sensor or mechanism unit is defective.
2. Setting of address data has mistake.
3. Coefficient memories (address data) have changed
by noises or static electricity.
4. Calibration weight is not correct.
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Causes & Remedy