Electrical Systems
Ensure that the batteries are charged. Turn the lift on & look at the LCD reading to check the
battery charge level. If the batteries are not charged, put them on charge before servicing the
equipment or connect a fresh set of batteries. If the charger indicator does not give any reading,
batteries can be tested “outside the system” with a load tester or, again, a fresh set of batteries
should be hooked up. An occasional battery problem is acid leaks at the vents. Sometimes a
leak shows up as corrosion of the battery leads.
Do a preliminary inspection of the circuit boards for burn marks or burn odors. A single or series
of components may have failed. The PCB will have to be replaced.
When an electrical problem seems to be the cause of the malfunction, it is important to first
check that all the wire harnesses are plugged in. Secondly it is important to check all wire
harnesses for cuts and/or exposed wires. If this is found, the wire harness must be replaced.
Main Board on Manual and Power Traversing Systems
The white power plug, located next to the fuse connects the batteries to the circuit board. The
circuit board is connected to the main motor via the white plug on the left bottom most side of
the board. The board and motor plugs have the same type of connector but differ from the other
function connectors to prevent erroneous hook-up. The battery cables are color-coded black
and red to match the battery leads. Check to see that the board, lift motor and battery plugs are
properly connected.
The upper left most large 2-pin white plug on the PCB, connects the charger to the PCB. The
2-pin connector next to the white power plug, connects the power switch. The 3-pin white plug
connects the LED indicator to the PCB. The 16-pin connector, fourth from the left connects the
LCD display to the PCB. The 4-pin white plug, second from the right, connects the “slack tape”
and “tape thickness” limit switches on the tape switch assembly to the circuit board. Check to
see that the functionality plugs are properly connected (when connecting a plug, it is easy to
miss a prong) and that the wires do not pull out of the functionality plugs (if a wire does pull out,
it was either connected incompletely or connected upside down).
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