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Fan runs only high speed prior to pressing the torch trigger:
J608-3, speed control wire, is typically 6-7V in high speed and pulled to near zero by the Inverter board for
low speed.
a. Measure J608-3(+) to J608-2 (or work lead), if near zero volts replace the fan. If higher, greater than 1V
(typically 6-7V), replace the Inverter board. If it is 24V it could be both Inverter and fan are bad.
Fan won't run high speed:
Momentarily press the torch trigger (Start), fan should switch to high speed. J608-3 is typically 6-7V in high
speed.
a. Measure J608-3(+) to J608-2 (or work lead), if near zero volts replace Inverter board. If higher, greater
than 1V (typically 6-7V), replace the fan. If it is 24V could be both Inverter and fan are bad.
5. Gas Purge
At the end of the startup time, as the display is showing the amperage setting, gas should flow from the torch
for one to two seconds. This is a test to confirm gas is connected to the unit and the solenoid works.
The basic unit has an internal proportional solenoid, SOL1, which controls the gas flow/pressure. A-Series Au-
tomation units also control an on/off solenoid on the torch. It is activated the same time as SOL1. Whether or
not it is an automation unit, an LED, TORCH SOLENOID ON (D644), on the Inverter board illuminates when
the SOL1 should be on.
D
2
1
C610
J601
+
C633
Torch
Sol On
TORCH SOL ON
8
4
F
START
J607
Manual 0-5475
J602
50
B
PRI 1
49
SEC
PRI
U618
U608
T600
Q602
+
1
1
J610
Q603
K
C667
J600
6
4
3
1
Q606
PRI
SEC
K600
C608
OK TO MOVE
R658
10
18
R655
5
1
9
1
R653
J609
UP
E
E
E
BUS+
GND_PRI
C612_2
C612
C618
+
+
C619
C613
+
+
C614
C620
+
+
PRI 2
T601
B
PIC OK
SERVICE
CUTMASTER 60i
D
Q605
B
SEC 2
PRI
SEC
C649
D633
R705
B
SEC 1
R647
C630
C631
D635
C634
R643
RED
R652
B
Q608
TIP
U605
U607
1
TP21
C636
PILOT GATE
U610
GND
B
WORK
BLACK
J611
ELECTRODE
F
Art # A-13302
5-23
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Table of Contents
Troubleshooting
