Troubleshooting Power Source - Hobart AirForce 625 Manual

5-4. Troubleshooting Power Source

Is Power switch
S1 in the On
position?
Yes
Is Power light
flashing?
No
Is Cup Status
light On or
flashing?
No
Is Temp Status
light On?
No
Is Pressure Status
light On or flashing?
No
No Place Power switch in the
On position. (see Section
4-1).
Yes
Reset Power switch S1.
Check torch consumables/
cup. Reset Power switch
Yes
S1. *Check torch connec-
tions. *Check Control board
PC1.
If unit is overheated, wait
Yes
while fan cools down unit
temperature.
Turn Output control
fully counterclockwise (see
Section 3-12). Check for
Yes
gas/air flow at torch. *Check
Control board
pressure switch, air filter,
valve AS1, and air supply
connection to unit and torch.
Does pilot arc
ignite?
Yes
Does pilot arc
transfer
workpiece?
Yes
*
Check all connections,
Check main transformer T1,
Check boost inductor L1
and output inductor L2.
Return to beginning of chart.
NOTE: The fan will normally run for
approximately 5 seconds after power
switch is placed in the Off position (see
Section 4-1).
PC1,
Press torch trigger and
check if pilot arc ignites.
Check torch consumables.
No
*Check torch connections,
air filter, pressure switch S3,
valve AS1,
connection to unit, torch,
and PC1.
Place torch near workpiece
and check if pilot arc "jumps"
or transfers to workpiece.
No
Check work
to
connection. *Check Control
board PC1 and connections,
and torch and its connections.
*Servicing procedure to be
performed only by authorized
Service Station.
air supply
clamp
OM-926 Page 25