Manual 0-2569 29 SERVICE TROUBLESHOOTING
measure wire #9 to J2-5. If there is no voltage at
J2-5, see Section 4.05-A, Voltage Select PCB Test,
120 VAC test.
e. If there is voltage at J2-5 but not at J2-3 then Logic
PCB is faulty.
• Secondary Gas Problems Without Optional
Gas Control (GC3000)
The Secondary Gas Solenoid (SOL2) is located at the
rear panel of the power supply. The secondary gas to
be used is selected by the mode switch (SW3). Low
or no pressure on the Secondary Pressure Gauge can
indicate a problem with the secondary gas solenoid,
regulator, clogged torch head and leads or the gas sup-
ply.
Low or no flow of secondary gas in SET Mode. Make
the following checks:
a. Check that the incoming secondary gas pressure is
correct. Secondary gas pressure above 125 psi (8.6
bar) can prevent opening of the gas solenoid.
b. With power removed from the power supply re-
move the secondary gas connection at the power
supply bulkhead. Place the secondary mode se-
lector switch to gas (cylinder symbol). Turn ON
the power supply and set the RUN/PURGE/SET
switch to the SET position. If there is a strong flow
of secondary gas the torch head or leads are
clogged. If there is a weak or no flow the gas sole-
noid is faulty.
c. Measure the secondary gas solenoid (SOL2) coil
resistance, if it’s not about 375 ohms replace the
solenoid. If resistance is correct measure for 120
VAC across the solenoid coil, if correct the plunger
is stuck, replace the solenoid.
d. If there is no voltage, use Appendix XXIII or XXIV,
System Schematics, to troubleshoot.
SOL2 is controlled from the plasma relay, K3, on
the Logic PCB. To test for a bad Logic PCB, mea-
sure for 120 VAC between wire #9 on the ON/
OFF switch (SW1) and J2-7. If no voltage is there,
measure wire #9 to J2-5. If there is no voltage at
J2-5, see Section 4.05-A, Voltage Select PCB Test,
120 VAC test.
e. If there is voltage at J2-5 but not at J2-7 then Logic
PCB is faulty.
• Secondary Water Problems With or Without
Optional Gas Control (GC3000)
The Secondary Water Solenoid (SOL3) is located at
the rear panel of the power supply. The secondary to
be used is selected by the mode switch (SW3). Low
or no pressure on the Secondary Pressure Gauge can
indicate a problem with the secondary water solenoid,
regulator, clogged torch head and leads or the water
supply.
Low or no flow of secondary water in SET Mode.
Make the following checks:
a. Check that the incoming secondary water pressure
is correct. Secondary water pressure should be 50
psi (3.5 bar).
NOTE
When using secondary water, remove the water
supply and connect a gas supply to the rear panel
fitting for troubleshooting to prevent blowing wa-
ter into the unit.
b. With power removed from the power supply re-
move the secondary gas (see NOTE) connection
at the power supply bulkhead. Place the second-
ary mode selector switch to water (faucet symbol).
Turn ON the power supply and set the RUN/
PURGE/SET switch to the SET position. If there
is a strong flow of secondary gas the torch head or
leads are clogged. If there is a weak or no flow the
gas solenoid is faulty.
c. Measure the secondary water solenoid (SOL3) coil
resistance, if it’s not about 375 ohms replace the
solenoid. If resistance is correct measure for 120
VAC across the solenoid coil, if correct the plunger
is stuck, replace the solenoid.
d. If there is no voltage, use Appendix XXIII or XXIV,
System Schematics, to troubleshoot.
SOL3 is controlled from the plasma relay, K3, on
the Logic PCB. To test for a bad Logic PCB, mea-
sure for 120 VAC between wire #9 on the ON/
OFF switch (SW1) and J2-7. If no voltage is there,
measure wire #9 to J2-5. If there is no voltage at
J2-5, see Section 4.05-A, Voltage Select PCB Test,
120 VAC test.
e. If there is voltage at J2-5 but not at J2-7 then Logic
PCB is faulty.
• Plasma Gas Problems With Optional Gas
Control (GC3000)
NOTE
For detailed of circuits refer to Appendix XXI, Gas
Control Wiring Diagram.
a. The Optional Gas Control (GC3000) includes a gas
manifold of four Plasma Select Solenoids, SOL 4 -
SOL7, which can be used to select one of up to
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