MAINTENANCE
3-24
Service Manual
Air coming
out of torch?
To
page 3-25
From
page 3-23
Pilot arc
fires ?
Press & hold GAS TEST switch S2.
Adjust pressure regulator for 70 psi
(4.8 bar) indication (dynamic) on
gauge.
Check control board TP2
for 12V when torch start
switch is pressed.
Unplug power supply. Disconnect
control board connector JP8.
Measure resistance between JP8
sockets 5 & 6 while pressing torch
start switch.
Disconnect torch lead and check pins
6 & 7 of torch lead plug when torch
start button is pressed.
0 ohms ?
Yes
Indicates 0 psi
?
Check JP4 sockets and control
board pins 5 & 6. Check wires
W65 & W66. Check gas
solenoid V1 & pressure
regulator. If no problems are
found replace control PCB.
70 psi (4.8 bar)
dynamic ?
No Yes
Check regulator &
hoses for leaks.
Ensure GAS TEST switch S2 has
been released. Press torch start
switch to fire pilot arc.
Yes
Yes
Check regulator &
hoses for leaks.
No
No
Yes
12V?
Relay CR2
closes when
torch start
switch is
pressed
?
0 ohms ?
See Torch
Check Start
Circuit later in
this section.
Check JP4 sockets
and control board
pins 1 & 2.
Check wires W61 &
W62.
Check pilot arc relay
CR2.
Repair or replace as
needed.
Yes
No
See Torch
Check Start
Circuit later
in this
section.
Check wiring from power
supply quick disconnect
to control board JP8.
No
No
Yes
No
NoYes
Wiring
OK?
See Torch
Check Start
Circuit later
in this
section.
Yes
Repair wiring
as needed.
No
Check
consumables and
replace nozzle, if
necessary.
Yes
9-96
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