Tweco 250 Weldskill MIG - Manual (Page 39)

8- Manual No 0-5072
service weldskill 250, 350
December , 2008
SECTION 8:
SERVICE
8.01 Routine Maintenance & Inspection
The only routine maintenance required for the WeldSkill 250, 350 MIG Power Source is a thorough cleaning
and inspection, with the frequency depending on the usage and the operating environment.
WARNING
There are dangerous voltage and power levels present inside this product. Do not attempt to
open or repair unless you are a qualified electrical tradesperson. Disconnect the Wirefeeder from
the Welding Power Source and the Welding Power Source from the Mains Supply Voltage before
disassembling.
Special maintenance is not necessary for the control unit parts in the Power Source. If these parts are dam-
aged for any reason, replacement is recommended.
CAUTION
Do not blow air into the Power Source during cleaning. Blowing air into the Power Source can
cause metal particles to interfere with sensitive electronic components and cause damage to the
Power Source..
To clean the Power Source, disconnect it from the Mains Supply then open the enclosure and use a vacuum
cleaner to remove any accumulated dirt and dust. The Power Source should also be wiped clean. If necessary,
solvents that are recommended for cleaning electrical apparatus may be used.
Troubleshooting and repairing the WeldSkill 250, 350 MIG Power Source should only be carried out by a
qualified Electrical Tradesperson.
8.02 Cleaning the Feed Rolls
Clean the grooves in the drive rolls frequently. This can be done by using a small wire brush. Also wipe off, or
clean the grooves on the upper feed roll. After cleaning, tighten the feed roll retaining knobs.
8.03 Basic Troubleshooting
WARNING
There are dangerous voltage and power levels present inside this product. Do not attempt to open
or repair unless you are a qualified electrical tradesperson and you have had training in power
measurements and troubleshooting techniques.
If major complex subassemblies are faulty, then the Welding Power Source must be returned to an
Accredited CIGWELD Service Provider for repair.
The basic level of troubleshooting is that which can be performed without special equipment or knowledge
and without removing the covers from the Wirefeeder.
8.04 Solving Problems Beyond the Welding Terminals
The general approach to fix Gas Metal Arc Welding (GMAW) problems is to start at the wire spool then
work through to the MIG torch. There are two main areas where problems occur with GMAW, Porosity and
Inconsistent wire feed.