KERN EG, Service Manual

Page: 9 / 46

3.2 Trouble shooting Table
Symptoms Causes & Remedy
No display lights on. 1. AJDP board is defective.
2. AC adapter is defective.
3. Wrong connection of connection cords inside.
4. Built-in battery (option) is discharged.
u-Err
or
o-Err
appears self test of
segments.
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.
Display dose not get
settled down.
Display dose not repeat
correctly.
Zero point drifts. 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.
o-Err
appears
with a net load less than
specified capacity (F.S.
+9d).
1. Gross weight applied to the scale pan (net
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.
Span is out of specified
range. 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.
Linearity is out of
specified range. 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.
- 9 - EW_EW-C_EG_N-SH-e-0722