TROUBLESHOOTING
4-14
Manual 0-2972
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.
4.09 Main Arc Problems
Locate your symptom below:
A. Main cutting arc will not start
1. Work cable not connected.
a. Connect work cable.
2. Holding too high of a standoff.
a. Refer to recommended standoff heights. Adjust
as needed.
3. Workpiece is painted or rusty.
a. Clean workpiece.
4. Faulty Main PC Board or Logic Board.
a. Measure for ±0 vdc at TP2
to TP1 on the Logic
Board when attempting to transfer. Refer to
Logic Board Layout.
• If voltage goes to 0 vdc replace Output Board.
• If not, replace Main PC Board.
5. Faulty Main Input Contactor.
a. Check per Subsection 4.10-D.
B. When operating the amperage drops off after the main
cutting arc starts.
1. Faulty Pilot Board
a. With power off and wires E58 and E62 disconnected
from the pilot board, measure for continuity between
terminals #E58 and #E62. If continuity is found, re-
place Pilot Board.
Art # A-03883
TP6
D8
TP1
TP8
TP9
TP10
TP3
TP4
TP2
TP5
TP7
P1-1 to P1-36
P1-7
Logic Board Layout
