17
7. TROUBLE SHOOTING
No power Open indicator
and measure
power on the
board.
Is voltage coming from
the truck battery?
Check where the power line comes from. See if power
is available on this point.
Mostly a fuse is installed. Measure is voltage is also
available after the fuse.
If power is available in the indicator then check if the
power board is not functioning.
If the power from the
truck is more than 12
Vdc, then the first
board is a power
converter board.
Check if red and black wire connected between the
power board and the main board has 12 Vdc.
If there is no 12Vdc coming out of this board check
this board. If nothing can be found it needs to be
replaced.
If 12Vdc is supplied to the main board. Then check
the main board.
12Vdc on the
board
Check the board for
burned components
Picture of component most likely to blow when
batteries have been entered the wrong way.
Accuracy
No repeatability Check if there is a
mechanical problem.
Load left and right fork with for example body weight
and see if weight changes when you are in different
positions on the scale.
There should not be a difference larger than 2 lb.
If there is a bigger difference then 5 lb you have a load
cell or a mechanical problem.
To make sure it is a mechanical problem, repeat test
with a heavy load on the scale, Lift a pallet with 2000
or 3000 lb.
Reset Indicator for 0 lb using the tare function.
Load corners with body weight by standing on or on
the sides of the pallet. If readings change more than 5
lb you have a mechanical problem.
The push rods in the forks may not interfere with the
load cells. Take of the fork shoe by unscrewing the
nuts on the bottom side of the pallet truck.
Push the pushrods sideways towards the load cells to
see if they come in contact with the load cells: see if
they can interfere with the load cells.
With the forks lifted half way up, the brackets for the
loading wheels may touch the fork shoe. By taking off
the fork shoe, Scratches will show if it does and where
it does.
Check if bolts are loose.
Check the load cells. If
one is broken or gives
more or less signal
than the others, the
scale will give different
reading depending
how it is loaded.
To be sure that it is not a mechanical problem, load
the load cells directly. Take off the fork cover. Try to
apply weight 25 to 50 kg / lb, direct onto each load
cell. If the indicator shows the same reading, the load
cells are OK.
Tap with a hammer onto the load cells. Do not be
afraid to break it. Repeat the test for each load cell.
