Tweco VS 212 PortaFeed - Manual (Page 39)

PORTAFEED VS 212
Manual No. 0-4994 5-1 SERVICE
SECTION 5:
SERVICE
5.01 Cleaning Of The Unit
About every 6 months, remove the interior panel cover
to expose the printed circuit boards and other
components. Using a vacuum cleaner or clean, dry,
compressed air of not more than 25 psi (172 kPa,
1.72 bar) pressure, vacuum or blow out the interior
of the wire feeder. While the interior panel cover is
removed, check all electrical components for loose
connections and correct if necessary.
5.02 Cleaning Of The Feed Rolls
About every 3 months, clean the grooves on the feed
rolls using a small wire brush. If the feed roll has a
smooth surface, wipe off the feed roll with a clean,
dry cloth. After cleaning the feed rolls, tighten the
upper and lower feed roll retaining knobs accordingly.
5.03 Troubleshooting Guide
1. Scope: The troubleshooting guide is intended to
be used by qualified service technicians. The
troubleshooting guide contains information which
can be used to diagnose and correct unsatisfactory
operation or failure of the various components of
the wire feeder. Each symptom of trouble is
followed by a list of probable causes and the
procedure necessary to correct the problem.
2. Safety: To ensure safe operation and service, read
this entire manual before attempting to service or
repair this machine. The service technician may
be asked to check voltage levels while the machine
is turned ON; to assure safety, use care and follow
all instructions accordingly!
5.04 Troubleshooting Hints
Examine connections for proper assembly and contact
before replacing an electrical component or printed
circuit board. Wire lugs should be in tight contact
with the lead’s conductor and should be crimped to
the lead’s insulation. The mating surfaces of the
connection should be clean and free of oxidation.
Do not pull on wires to disassemble connections.
Firmly grasp each lug or connector when
disconnecting. Pulling on wires for disassembly can
damage the integrity of the connection and cause
future malfunctions.
Prior to disassembly or servicing of the machine, note
the wiring and connections in the machine.
Reassembling should place the wires in the same
location and routing as received from the factory. Keep
wires and leads away from hot parts and sharp
objects.
5.05 Common Symptoms
!
WARNING
ELECTRIC SHOCK can kill.
· Follow all safety precautions.
· Do not touch live electrical parts.
· Turn OFF input power before servicing the
machine unless otherwise noted.
· Only qualified technicians are to service
the machine.
!
WARNING
This machine contains static sensitive
devices.
· Use static proof bags to store
electronic components.
· Use grounded wrist strap.
· Use qualified personnel when testing or
handling device.
NOTE
Refer to the Connection Diagram and the
Schematic Diagram in the Appendix
chapter of this manual for graphical
assistance in disassembling and
troubleshooting the wire feeder.
Use only genuine replacement parts.
1. Unit is completely inoperative - nothing
functions.
A. Make sure all connections have been made
to both the power source and wire feeder.
B. Make sure both the power source and wire
feeder are turned ON.
C. Check 18 ga. wire connection on rear bus
bar of the contactor for loose or faulty
connections.
D. Check for a damaged power switch.
E. Check for a damaged or tripped circuit
breaker.