logic board) has a window on it which is covered with
a label listing the revision level of the software. The
window is used to erase the chip’s memory with the
use of ultraviolet light. the label prevents light from
entering the chip and erasing the memory. Under NO
circumstances should this label be removed.
processor at any point, other than the
vdc. Connector points and the associated approximate
no circumstances should 12 vdc be applied at these
Grounded wrist cuffs are available at most radio,
Table 4-2 Connection Point Voltage
resultant damage to the components
by touch. This is especially true of the
truck/trailer microprocessor.
discharge ESD damage in the outdoor environment,
board handling techniques should always be stressed.
Boards should always be handled by their edges, in
much the same way one would handle a photograph.
This not only precludes the possibility of ESD damage,
used to keep a unit running and prevent a critical load
engine’s safety switches for oil pressure and coolant
Since the engine is running unprotected
it is imperative that should
The test board is intended to be
When using the test board to troubleshoot, the unit
should be started in low speed, unloaded cool in the
same way as the processor would start the unit.
the test board. Rapid cycling should be avoided.
other areas of the trailer, the welder ground connection
MUST be in close proximity to the area being welded.
good practice to remove both battery cable
before welding on either the unit frame or the truck to
prevent possible damage to other components such as
the alternator and voltage regulator.
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