Nova-Tech PW Series - Manual (Page 41)

Page 41 of 48
© Adam Equipment Company 2007
Poor Linearity Usually a mechanical
problem
Electronic Problems
Re-check repeatability
*Inspection of the flexures for damage
or 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. Make sure all mechanical
problems have been eliminated first
OTHER PROBLEMS
Cannot calibrate Zero shifted more
than allowed
Calibration timeout
*Check all flexures for damage
*Reset factory calibration
*Verify linearity and repeatability
*The balance may be unstable. Verify
stability as above. Try using a more
aggressive filter
Calibration weight
motor does not stop *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.
RS-232 not working Doesn’t print Check parameters match the device
connected
Verify cable is correct
*RS-232 circuits damaged
Display dark, keys
beep Display contrast poor
Cable unplugged or
damaged
*Check the cables to the display
*Replace the display which could be
damaged
*To be carried out by authorised technicians only.