Symmetry 124 User Manual page 44

Poor Linearity
OTHER PROBLEMS:
Cannot calibrate
Calibration weight motor
does not stop
RS-232 not working
Display dark, keys beep
*To be carried out by authorised technicians only.
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Usually a Re-check repeatability
mechanical *Inspection of the flexures for damage or
problem loose hardware may be required
*Use the Linearity Function in the service
menu to reset linearity
*A problem in the analogue circuit board or
power supplies can cause poor linearity.
Electronic Make sure all mechanical problems have
Problems been eliminated first
Zero shifted more *Check all flexures for damage
than allowed *Reset dealer calibration
*Verify linearity and repeatability
Calibration *The balance may be unstable. Verify
timeout stability as above.
*Check the cables to the motor, try
plugging the balance into the power again
*Look for friction in the calibration weight
movement
*Check the opto-coupler that controls the
motor position.
Doesn't print
Check parameters match the device
connected
Verify cable is correct
*RS-232 circuits damaged
Display contrast *Check the cables to the display
poor *Replace the display which could be
Cable unplugged damaged
or damaged
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