Nova-Tech PW Series - Manual (Page 39)

Page 39 of 48
© Adam Equipment Company 2007
Electronic Problems:
These are the rarest of the problems affecting balances. If an electronic
problem is suspected make sure the mechanical problems that can cause
similar symptoms have been eliminated before attempting electronic repairs.
With the exception of cables most electronic repairs are solved by board
replacement.
The table that follows is a guide of common problems and their solutions.
Note that many problems may have multiple solutions and there may be
problems found that are not listed in the table. For Service Information,
contact Adam Equipment or your supplier.
BALANCE DOES NOT FUNCTION
Problems Possible causes Suggestions
The balance is dead
when power is applied Power supply failure Check adapter is working
Check adapter is correct for the balance
Normal adapter is 15VDC, 800mA.
*Power supply circuit board failure
*Short circuit on any circuit board
The display does not
turn on but the
calibration motor
moves when power is
applied Power is getting to
balance, display is not
working *Display cables may be faulty
*Display module failure
The display stays on
the initial test screen
when power is applied.
Calibration weight
motor is on. Unstable balance
Balance not working
correct
Power supply
*Check if balance is stable by using
service menu and view A/D values
Put draught shield over pan
Check power supplies
BALANCE WORKS BUT IS NOT STABLE
Balance is unstable by
a few divisions Noise or vibration
from environment
Friction in mechanics
Check the balance is positioned
correctly to avoid vibration, wind or air
movement, it is on a solid table, It is not
near sources of heat or cool air,
Check balance with weights if problem
occurs when sample is used. Static
electricity on the samples can cause
drifting and instability.
Check the area around the weighing
pan for hair, dust, obstructions under
the pan,
*A complete inspection of the
mechanics to look for sources of friction
may be needed.