Thermal Dynamics CUTMASTER 81, Service Manual

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Manual 0-2957 4-13 TROUBLESHOOTING
D. Gas flows; AC indicator and GAS indicators
ON; TEMP indicator off; DC indicator
off or blinks on/off once.
A
Ar
t # A-03
99
1
OR
1. Faulty IGBT or Output Diode Module Assembly(s)
a. Check per Subsection 4.10-C; repair as needed.
2. Faulty Main PCB
a. Test per Subsection 4.10-F; repair as needed.
E No arc or intermittent arc in torch; Gas flows;
AC , GAS and DC indicators ON;
TEMP indicator off
A
Ar
t # A-03
99
2
1. Gas pressure set incorrectly (too high)
a. Reset gas pressure per pressure setting label on
power supply.
2. Oil/moisture in air lines
a. Put the ON / OFF switch in the ON (up) posi-
tion. Put the RUN / RAPID AUTO RESTART /
SET switch in the SET (down) position.
b. Place a welding filter lens in front of the torch
and turn on the air. Any oil or moisture in the
air will be visible on the lens.
Do not start an
arc!
c. Purge system. If problem corrected, add filters
in line with air source.
3. Incorrect torch parts
a. Inspect the torch parts; replace as needed.
4. Faulty leads
a. Check torch leads continuity.
5. Faulty torch
a. Check torch.
6. Faulty connection of wire #58 or 62 to Pilot Board
a. Check wiring connection. Refer to the System
Schematic in the Appendix. Connections
should be:
• Wire #58 to Pilot Board terminal E58
• Wire #62 to Pilot Board terminal E62
If wires 58 and 62 are not connected to the proper
terminals, replace the Pilot Board.
7. Faulty Main PC Board
a. Check for approximately 12 vdc at TP4 to TP1.
If less than 2 vdc, replace the Main PC Board.
8. Faulty Logic Board or Faulty Pilot Board
a. Install a jumper between wires 58 and 62 on
Pilot Board and retry piloting. If torch pilots
with jumper installed, replace Pilot Board. If
torch does not pilot, replace Logic Board.