ESAB fabricator 141i, Service Manual

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ESAB FABRICATOR 141i
Manual 0-5448 6-1 TROUBLESHOOTING
6.01 Pre-Power Up Checks
It is best to perform the following Pre-Power Up test procedures in order to prevent blowing Primary Line Fuses or causing further dam-
age to the power supply.
Checking Unit Before Applying Power
!
CAUTION
The following safety information shall be read before starting troubleshooting and servic-
ing:
1. Turn SW1 to OFF position, and disconnect unit from primary line voltage before
working on unit.
2. Significant DC voltage can remain on capacitors after unit is Off. Wait until all front
panel LED’s are off before removing case.
3. Before troubleshooting or applying power to unit, complete the following checks to
avoid causing further damage.
4. STATIC (ESD) can damage PC boards.
With switch SW1 in OFF position, push and release the two push button switches. Each should have a recognizable tactile on/off
position. If either switch does not switch properly, check that the appropriate switch activators located behind the overlay are aligned
properly.
Turn the three potentiometer knobs. All of the three knobs should turn in both directions smoothly and have two stop positions.
6.02 Tools Needed for Troubleshooting and Servicing
Art # A-09849
6.03 Troubleshooting
WARNING
There are extremely dangerous voltage and power levels present inside this unit. Do not attempt to diag-
nose or repair it unless you are an accredited service provider and you have had training in power electron-
ics measurement and troubleshooting techniques.
Power Up Problems
NOTE!
In the event that either an individual indicator will not come on,or if a segment on the either Digital Display
will not light, yet the unit is otherwise fully functional, the Display PCB3 should be changed.
Before changing any PCB, check that the PCB in question has the appropriate input power supply voltage
as listed in PCB CONNECTORS section 6.11.
SECTION 6:
TROUBLESHOOTING