TECHNICAL SERVICE MANUAL FOR MASTERTIG ACDC
TROUBLESHOOTING CHART
PROBLEM CAUSE REMEDY
The cooling unit is not operational
or H001 light is on.
The water doesn’t circulate by switch
SW302.
Water doesn’t return back to the
tank.
Blown fuse F002 2A.
Broken or faulty auxiliary-
transformer T005.
Broken pressure switch S002.
Pressure switch set value is
unsuitable for the
TIG torch which
is in use (other than original Kemppi
torch).
Air bubbles in the system.
Leakages in the cooling system.
Pump motor 5µ starting capacitor
C004 is faulty.
Broken or faulty PCB A005 .
Check and change the fuse if
needed.
Check first the supply voltage of
transformer from Z004, connector
1=230V, 2=400, and 3=460V. Then
check the secondary voltage of
transformer, check it from terminal
block XW301 between 4 an 5 the
voltage is c. 230 VAC.
Check the voltage over the pressure
switch or from PCB A005 X2/1 and
X2/8; enough pressure 0V and lack
of pressure c. 5V.
Adjust the pressure set value from
the adjustment screw, of pressure
switch according following
instructions:
I
START PRESSING TEST SWITCH
SW302 AND ADJUST THE ADJUSTMENT
SCREW
(SEE PICTURE 3.) FOR
PRESSURE, IN SUCH WAY THAT THE
SIGNAL LAMP
H001 IS ONLY JUST
SWITCHED OFF
.
II
RELEASE SWITCH SW302 AND WAIT
FOR APPR
. 10 S AND CHECK THAT
SIGNAL LAMP
H001 IS NOT FLASHING.
III
STILL CHECK BY WELDING FOR
APPROX
. 20 S THAT THERE ARE NO
MORE DISTURBANCES
.
Blow compressed air into tank,
closing the filling hole by hands is
enough.
Check/repair the connection of
cooling system connector by
connector. Repair the system if
needed.
Check and change the capacitor if
needed.
Change/repair PCB A005.
The solenoid valve Y001 is not
operating // stuck open
Faulty solenoid valve Y001 or
broken PCB A002.
Check the 24 VDC from A002
connector X9 between pins 1and 2.
If it is ok, change the solenoid valve.
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