SERVICE MANUAL
Transmig 165
ST
Transmig 165
ST
SERVICE MANUAL
Transmig 165
ST
Transmig 165
ST
TROUBLESHOOTING 10-2 Manual 0-5442
The following table is a guide for analysing problems and making repairs to the Power Source
Fault
Possible Cause
Remedy
8
Wirefeed motor operates
when the torch trigger
switch is depressed but
the gas valve does not
operate.
A
B
C
D
E
Internal wiring fault
Faulty Solenoid
Impurity in gas system causing
solenoid to stay open or closed
Faulty Power Inverter board
Faulty Control board
A
B
C
D
E
Check solenoid wiring header
is plugged securely into
Control board. Check solenoid
wiring is not damaged
Replace Solenoid
Clean out gas system.
Disassemble solenoid & clean
out impurities
Replace Power Inverter board
Replace Control board
9
A welding arc can be
established but the weld is
erratic or inconsistent
A
B
C
D
E
F
G
H
Work Lead cable too small
Loose welding connections
Loose earth clamp
Incorrect weld polarity selected
No shielding gas
Wind blows shielding gas away
Incorrect TIG tungsten electrode
Poorly prepared or worn TIG
tungsten
A
B
C
D
E
F
G
H
Use correct weld cable size
Tighten welding connections
Tighten earth clamp
Correct weld polarity.
Refer to weld consumable
manufacturers recommended
polarity
Connect shielding gas
Shield welding area from
draughts
Use correct tungsten type
Regrind tungsten to correct
shape
10 Gas flow continues after
the torch trigger switch
has been released (MIG
mode).
Gas valve has jammed open due
to impurities in the gas or the
gas line.
Clean out gas system.
Disassemble solenoid & clean
out impurities or replace
solenoid.
Table 10-2 Power Source Faults
10.02 Checking Unit Before Applying Power
!
!
Turn SW1 to OFF position, and disconnect unit from primary line voltage before working on unit.
!
Significant DC voltage can remain on capacitors after unit is Off. Wait until all front panel LED’s
are off before removing case.
!
Check DC bus voltage according to Section 10.07 after removing case.
!
Before troubleshooting or applying power to unit, complete the following checks to avoid causing
further damage.
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