Trouble Shooting Table - KERN PNJ Service Manual

4 Trouble shooting table

Symptom
Nothing appears
on display.
"u-Err" or
"o-Err" appears
after "AA---"
appears.
Display value
is unstable.
Poor reproducibility
Zero point
fluctuates
" " appears
on display before
"Capacity + 9d" is
reached.
Span has
large
deviation.
Poor linearity
PNJ_PNS-SH-e-2011
1. AJDP circuit board failure
2. AC adapter failure
3. Poor cable connection in scale
4. Uncharged battery
1. Use of an irregular weighing pan
2. Tuning fork assy failure or
mechanical unit failure
3. AJDP circuit board failure
4. Incorrect setting of address data
(During data entry)
5. Coefficient memories (address
data) have changed by noises or
static electricity
1. Weighing pan (pan base) is
binding on something.
2. Foreign object inside scale
3. Tuning fork assy failure or
mechanical unit failure
4. Effect from wind or vibration (Is
the response speed too high?)
1. Sum of tare and weight exceeded
capacity
2. Coefficient memories (address
data) have changed by noises
or static electricity
3. Incorrect address data setting
(during data entry)
4. Span calibration utilized a weight
with a large error
1. Tuning fork assy failure or
mechanical unit failure
2. AJDP circuit board failure
3. Incorrect address data setting
(during data entry)
4. Coefficient memories (address
data) have changed by noises
or static electricity
1. Tuning fork assy failure or
mechanical unit failure
2. Incorrect address data setting
(during data entry)
3. Coefficient memories (address
data) have changed by noises
or static electricity
4. Span calibration used a weight
with a large error
Cause and troubleshooting
1. Replace the AJDP
circuit board.
2. Replace the AC
adapter.
3. Inspect inside of
scale.
4. Charge the battery.
1. Check the weighing
6. pan.
2. Replace the
mechanical unit.
3. Replace the AJDP
circuit board.
4. Check the address
data.
5. Check the address
data
1. Check the weighing
pan.
2. Inspect the inside of
scale.
3. Replace the
mechanical unit.
4. Reconsider the
installation
location and
response speed.
1. Check the tare.
2. Check the address
data.
3. Check the address
data.
4. Check the weight.
1. Replace the
mechanical unit.
2. Replace the AJDP
circuit board.
3. Check the address
data.
4. Check the address
data.
1. Replace the
mechanical unit.
2. Check the address
data.
3. Check the address
data.
4. Check the weight.
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