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OM-926 Page 25
6-4. Troubleshooting Power Source
No
Yes
Is Power light
flashing?
Reset Power switch S1.
No
Yes
Turn Output control
fully counterclockwise (see
Section 4-12). Check for
gas/air flow at torch. *Check
Control board PC1,
pressure switch, air filter,
valve AS1, and air supply
connection to unit and torch.
No
Yes
Is Pressure Status
light On or flashing?
Press torch trigger and
check if pilot arc ignites.
Check torch consumables.
*Check torch connections,
air filter, pressure switch S3,
valve AS1, air supply
connection to unit, torch,
and PC1.
Yes
No
Does pilot arc
ignite?
Place torch near workpiece
and check if pilot arc “jumps”
or transfers to workpiece.
Check work clamp
connection. *Check Control
board PC1 and connections,
and torch and its connections.
Yes
No
Does pilot arc
transfer to
workpiece?
Check all connections,
Check main transformer T1,
Check boost inductor L1
and output inductor L2.
Return to beginning of chart.
*Servicing procedure to be
performed only by authorized
Service Station.
Is Cup Status
light On or
flashing?
Check torch consumables/
cup. Reset Power switch
S1. *Check torch connec-
tions. *Check Control board
PC1.
Yes
Is Power switch
S1 in the On
position?
Place Power switch in the
On position. (see Section
5-1).
Is Temp Status
light On?
If unit is overheated, wait
while fan cools down unit
temperature.
Yes
No
No
NOTE: The fan will normally run for
approximately 5 seconds after power
switch is placed in the Off position (see
Section 5-1).
*