Trouble Shooting - KERN MWA NM Series Service Manual

9.6 Trouble Shooting

Problems
Display is blank.
No self test
Blank display after
self test
OL or -------
------- or NULL
displayed
Display is unstable
Weight value
incorrect
Can not use full
capacity
Platform Corner
Weight different
Battery not charging
MWA_NM-SH-e-1810
Possible cause
Mains power is turned off.
Power supply faulty or not
plugged. Internal battery is
not charged. On/Off switch
problem
Pan not installed.
Unstable weight, load cell
damaged
Maximum capacity
exceeded. Load cell or
mechanics damaged.
Power supply faulty
Weight is on the platform is
below permissible limit.
Pan not installed correctly.
Power supply faulty.
Load cell or mechanism
faulty
Goods touching
somewhere. Air variation or
any vibrations.
Temperature changed.
Load cell or connections
faulty.
Power supply faulty
Calibration error.
Platform of load cell
touching somewhere.
Wrong weighing unit
Over load protection
stoppers or transport locks
are not removed.
Parameters are set
incorrectly.
AD problem.
Load cell or mechanism
damaged
Over load protection
stoppers or transport locks
are not removed.
Load cell or mechanism
damaged
Mains voltage problem
Charging circuit problem
Battery Problem
Common Solutions
Check power is getting inside the scale and
on/off switch is working.
Verify the voltages, which is on the power
labels.
Check the pans are installed correctly. Try
to turning on again.
Check the platform is installed correctly.
Try to turn on the scale again. Do the
calibration again
Check the platform is installed correctly.
Try to turn on the scale again.
Do the calibration again
Check the scale is in acceptable location.
Check the connecters and load cell.
Check the power supply and battery
Use accurate weight for to do the
calibration
Check the pan and load cell is installed
proper and touching.
Check the parameter settings.
Check the load cell and connecters
Check the stoppers and locks under the
platform.
Check the weighing unit and parameter
settings.
Check the load cell.
Check the stoppers and locks under the
platform.
Use accurate weight for to do the
calibration
Check the load cell.
Check the mains and adaptor.
Check the battery.
Check the charging circuit
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