
TRANSTIG 170Pi
Manual 0-5242
6-3
TROUBLESHOOTING
6.02 Power Source Faults
The following table is a guide for analysing problems and making repairs to the Power Source.
FAULT
POSSIBLE CAUSE
REMEDY
1 There is no
weld output
and all front
panel displays
are off
A
B
C
D
E
F
The main Power Switch is set to OFF
Line fuse is blown
The main Power Switch is faulty
Faulty Power Inverter PCB
Faulty Control PCB
Faulty Display PCB
A
B
C
D
E
F
Set main Power Switch to ON
Replace Line fuse
Replace main Power Switch
Replace Power Inverter PCB
Replace Control PCB
Replace Display PCB
2 There is no
weld output
and all front
panel displays
are off or flick-
ering on & off
A
The internal protection circuit to shut
the unit down if the mains supply
voltage is too high has operated
A Check to see if mains supply voltage
is < 274 VAC. A generator with poor
voltage regulation may cause a supply
voltage in excess of 274 VAC.
Connect Power Source to a supply
voltage < 274 VAC.
3 There is no
weld output
and the yellow
over tempera-
ture light is on
A
B
C
Unit has overheated
Airflow inlet or outlet ducts are
blocked
Fan does not operate
A
B
C
Allow unit to cool with fan running un-
til over temperature light extinguishes
Remove blockages from airflow ducts
Replace fan. Check fan wiring header
is plugged securely into Control PCB.
Check fan wiring is not damaged
4 Mode switch
does not
change welding
mode
A
Faulty Display PCB
A Replace Display PCB
5 The weld
output do not
operate when
the torch trig-
ger switch is
depressed
A
B
C
D
E
F
G
Internal wiring fault
Over temperature light is on
Trigger wires shorted to weld voltage
inside TIG torch
Trigger wires or torch switch faulty
Faulty Power Inverter PCB
Faulty Control PCB
Faulty Display PCB
A
B
C
D
E
F
G
Check continuity of internal wiring
from8 pin control socket through to
boards
Allow unit to cool
Repair trigger wires in torch
Check & Repair
Replace Power Inverter PCB
Replace Control PCB
Replace Display PCB
6 Weld Output
operates when
the torch trig-
ger switch is
depressed but
the gas valve
does not oper-
ate.
A
B
C
D
E
Internal wiring fault
Faulty Solenoid
Impurity in gas system causing
solenoid to stay open or closed
Faulty Power Inverter PCB
Faulty Control PCB
A
B
C
D
E
Check solenoid wiring header is
plugged securely into Control PCB.
Check solenoid wiring is not damaged
Replace Solenoid
Clean out gas system. Disassemble
solenoid & clean out impurities
Replace Power Inverter PCB
Replace Control PCB
7
Weld Output
operates when
the torch trig-
ger switch is
depressed but
the HF does not
operate.
A
B
C
D
Internal wiring fault
Faulty HF PCB
Faulty Power Inverter PCB
Faulty Control PCB
A
B
C
D
Check HF PCB wiring headers are
plugged securely into Control and
Inverter PCB. Check wiring is not dam-
aged
Replace HF PCB
Replace Power Inverter PCB
Replace Control PCB
Table 6-2
Содержание 170Oi
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