Primary Power Problems - Thermal Arc Fabricator 140 Service Manual

ADVANCED TROUBLESHOOTING

6.08 Primary Power Problems

A. AC LED and fan are on, but VOLTAGE CONTROL
SWITCH SW1 is in Position "0".
1. SW1 is defective.
B. Nothing happens when the VOLTAGE CONTROL
SWITCH (SW1) is turned to position "1". Green AC
LED is off and the fan does not turn.
1. Circuit Breaker (CB1) is tripped..
a. Reset CB1.
2. Fuse F1 open.
a. Remove F1 and check continuity. Replace if
open.
3. Defective VOLTAGE CONTROL SWITCH (SW1).
a. Check continuity of SW1.
4. Primary line breaker / fuse is open.
a. Measure voltage at the primary receptacle. If
voltage is not present, reset breaker / replace
the fuse.
5. Primary line voltage to the unit is low.
a. Measure the voltage at the VOLTAGE
CONTROL SWITCH (SW1) between terminals
A1 to B1. Voltage should measure 120 VAC
for Fabricator 140 or 230 VAC for Fabricator
180. If the voltage is low at the unit but
measures correctly at the primary line outlet,
the primary line cord is too long or too small
to support the unit.
Be sure to remove any extension cords and
plug the unit directly into a wall outlet.
C. Green AC LED comes on but the fan is not turning.
1. Defective fan.
a. Measure voltage on PCB terminals J3 to JFM.
If voltage measures at 120 VAC for Fabricator
140 or 230 VAC for Fabricator 180, replace
the fan.
January 25, 2008
NOTE
D. Green AC LED is on, fan turns, OVERTEMP LED is on.
1. The unit is overheated.
a. Allow the unit to remain on with the fan running
to cool. See section 2.07 for duty cycle
information.
2. Defective Temperature Switch TS1 (for Fabricator
180 the TS2 may also be defective).
a. Measure continuity of Temperature switch(es)
and replace if open.
3. Open wire is temperature switch circuit.
a. Install a jumper on PCB between J5-5 to J5-6.
If the OVERTEMP LED goes out, the fault is in
the Temperature switch wiring.
4. Defective PCB.
a. Install a jumper on the PCB between J5-5 to
J5-6. If the OVERTEMP LED does not go out,
replace the PCB.
E. Gas flows and feed roll turns without closing the MIG
gun switch.
1. MIG gun switch is shorted.
a. Unplug MIG gun plug P6 from the CONTROL
RECEPTACLE J6.
b. If the gas turns off and the feed roll stops
turning, the fault is in the MIG gun.
2. Defective PCB.
a. Unplug and isolate the J5 connector from the
PCB.
b. If gas flows and the feed roll continues to turn,
replace the PCB.
3. Short in the wire harness.
a. If unplugging J5 in the previous step causes
the gas and feed roll to stop, there is a short
in the wires going from J5 to J6.
F. AC LED is on, fan is on, gas is off, feed rolls do not
turn but output voltage is present.
1. Defective PCB.
a. Replace PCB.
6-3
FABRICATOR 140, 180
Manual 0-4992