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5.0 MAINTENANCE
5.1 MAINTENANCE AND SERVICE
BE SURE THAT THE BRANCH CIRCUIT OR MAIN DISCON-
NECT SWITCH AND MULTIMASTER POWER SWITCH ARE
OFF OR ELECTRICAL INPUT FUSES ARE REMOVED BEFORE
ATTEMPT ING ANY INSPECTION OR WORK INSIDE THE
POWER SOURCE. PLACING THE POWER SWITCH ON THE
POWER SOURCE IN THE OFF POSITION DOES NOT REMOVE
ALL POWER FROM INSIDE THE EQUIPMENT.
INSPECTION, TROUBLESHOOTING AND REPAIR OF THIS
EQUIPMENT MAY ORDINARILY BE UN DERTAKEN BY A
COMPETENT INDIVIDUAL HAV ING AT LEAST GENERAL
EXPERIENCE IN THE MAINTENANCE AND REPAIR OF
SEMI-CONDUC TOR ELECTRONIC EQUIPMENT. MAINTE-
NANCE OR REPAIR SHOULD NOT BE UNDERTAKEN BY
ANYONE NOT HAVING SUCH QUALIFICATIONS.
Shut OFF shielding gas supply at source.
5.2 INSPECTION AND SERVICE
Keep equipment in clean and safe operating condition free of
oil, grease, and (in electrical part) liquid and metallic particles
which can cause short circuits.
Regularly check cylinder valves, regulators, hoses, and gas
connections for leaks with soap solution or leak test solution
(P/N 998771).
Check for and tighten loose hardware including elec trical
connections. Loose power connections overheat during
welding.
Immediately replace all worn or damaged power cables and
connectors. Check for frayed and cracked insu lation, particu-
larly in areas where conductors enter equipment.
The electrode wire and all metal parts in contact with it are
electrically energized while welding. Inspect these parts
periodically for defective insulation and other electrical
hazards.
IF UNINSULATED CABLE AND PARTS ARE NOT REPLACED,
AN ARC CAUSED BY A BARE CABLE OR PART TOUCHING A
GROUNDED SURFACE MAY DAMAGE UNPROTECTED EYES
OR START A FIRE. BODY CONTACT WITH A BARE CABLE,
CONNECTOR, OR UNCOVERED CONDUCTOR CAN CAUSE
A FATAL SHOCK.
Keep power cables dry, free of oil and grease, and protected
at all times from damage by hot metal and sparks.
Clean dirt and metal particles from drive roll groove weekly;
replace roll if badly worn.
5.2.1 POWER SOURCE
5.2.1.1 RECTIFIERS AND TRANSISTORS
It is recommended that the internal components be cleaned
occasionally by blowing them out with low pressure com-
pressed air. This cleaning operation is necessary so that
maximum cooling will be accomplished by the air stream.
This should be done periodically, depending upon the
location of the unit and the amount of dust and dirt in the
atmosphere.
The hermetically sealed diodes and transistors are specially
designed for welding machine use and will not age or de-
teriorate with use. The rectiers are mounted on heat sinks.
A periodic cleaning of dust and dirt from these is neces sary
to insure cooling of the rectiers. Should any rectier need
replacement, it can be quickly re moved from the heat sink.
5.2.1.2 FAN MOTOR
All models are equipped with an exhaust fan and rely on
forced draft for adequate cooling for high duty cycles and
overloads.
Do not use lters on this unit as they would restrict the
volume of intake air. Output ratings on this unit are based
on an unobstructed supply of cooling air drawn over
its internal components. Warranty is void if any type of
ltering device is used.
SECTION 5 MAINTENANCE
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