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F-3
PC BOARD TROUBLESHOOTING PROCEDURES
WARNING
ELECTRIC SHOCK
kill.
• Have an electrician install
CAUTION
Sometimes machine failures appear to be due to
PC Board failures. These problems can sometimes
be traced to poor electrical connections. To avoid
problems when troubleshooting and replacing PC
Boards, please use the following procedure:
1.
Determine to the best of your technical ability
that the PC Board is the most likely
component causing the failure symptom.
2.
Check for loose connections at the PC Board to
assure
that
the
connected.
3.
If the problem persists, replace the suspect
PC Board using standard practices to avoid
static
electrical
shock. Read the warning inside the static
resistant bag and perform the following
procedures:
PC board can be damaged by static electricity.
- Remove your body's static
charge before opening the
static-shielding bag. Wear an
antistatic wrist strap. For
safety, use a 1 Meg ohm
resistive cord connected to a
grounded
ATTENTION
equipment frame.
Static-Sensitive
Devices
- If you don't have a wrist
Handle only at
strap, touch an unpainted,
Static-Safe
grounded,
Workstations
equipment
touching the frame to prevent
static build-up.Be sure not
to touch any electrically live
parts at the same time.
- Tools which come in contact with the PC Board
must be either conductive, anti-static or static-
Troubleshooting and Repair
and
service
equipment. Turn the input
power OFF at the fuse box
before
working
equipment. Do not touch
electrically hot parts.
PC
Board
is properly
damage
and
electrical
part
of
part
of
frame.
Keep
INVERTEC
dissipative.
- Remove the PC Board from the static-shielding
bag and place it directly into the equipment.
can
Don't set the PC Board on or near paper, plastic
or cloth which could have a static charge. If the
PC Board can't be installed immediately, put it
this
back in the static-shielding bag.
- If the PC Board uses protective shorting
on
jumpers, don't remove them until installation is
complete.
- If you return a PC Board to The Lincoln
Electric Company for credit, it must be in the
static-shielding bag. This will prevent further
damage and allow proper failure analysis.
Test the machine to determine if the failure
4.
symptom
replacement PC Board.
NOTE: It is desirable to have a spare (known good)
PC Board available for PC Board troubleshooting.
NOTE: Allow the machine to heat up so that all
electrical components can reach their operating
temperature.
5.
Remove the replacement PC Board and
substitute it with the original PC Board to
recreate the original problem.
d. If
e. If the original problem is recreated by
the
6.
Always indicate that this procedure was
followed when warranty reports are to be
submitted.
the
NOTE: Following this procedure and writing on the
warranty report, "INSTALLED AND SWITCHED PC
BOARDS TO VERIFY PROBLEM," will help avoid
denial of legitimate PC Board warranty claims.
TM
CV350-R
has
been
corrected
the original problem
reappear by substituting the original
board, then the PC Board was not the
problem.
Continue to look for bad
connections
in
the
harness, junction blocks, and terminal
strips.
the substitution of the original board,
then the PC Board was the problem.
Reinstall the replacement PC Board
and test the machine.
F-3
by
the
does not
control
wiring
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Troubleshooting
