Lincoln Electric PRO-CUT 60 SVM104-A Service Manual page 70

F-29
Test B:
between Power Board and Control
Board
NOTE:
torch trigger be pulled to activate the
circuit. Be sure to use an isolated
meter because of the high voltage
and high frequency produced.
NOTE: This test requires testing DC
voltages. Polarity must be observed.
1. Locate and insert probes into
the following Power Board plug
locations (See Figure F.11):
a. Insert the NEGATIVE probe
b. Insert the POSITIVE probe
2. Turn the ON/OFF Power Switch
to ON.
3. Pull torch trigger. When air pre-
flow times out and the pilot arc
is established, 7 VDC should be
present.
4. Release
ON/OFF Power Switch to OFF.
a. If 7 VDC is NOT present,
b. If no loose or faulty wiring is
PRO-CUT 60
TROUBLESHOOTING & REPAIR
POWER BOARD TEST
Test for 7 VDC signal
This test requires that the
into Plug 4J22 (lead #332 - )
lead cavity.
into Plug 2J22 (lead #338 + )
lead cavity.
torch trigger.
check Power Board Plug J22
and Control Board Plug J6
for loose or faulty wiring.
found, the Power Board or
the Control Board could be
faulty. Replace.
Test C: Test for 1.0 VDC to 1.5
VDC Base Voltage to Transistor
Module
NOTE: This test requires that the
torch trigger be pulled to activate the
circuit. Be sure to use an isolated
meter because of the high voltage
and high frequency produced.
NOTE: This test requires testing DC
voltages. Polarity must be observed.
1. Locate and insert probes into
the following Power Board plug
locations (See Figure F.11):
a. Insert the NEGATIVE probe
into Plug 2J20 (lead #40 - )
lead cavity.
b. Insert the POSITIVE probe
into Plug 1J20 (lead B + )
lead cavity.
2. Turn the ON/OFF Power Switch
to ON.
3. Pull torch trigger. When air pre
flow times out and the pilot arc
is established, 1.0 VDC to 1.5
VDC should be present.
Turn 4. Release
ON/OFF Power Switch to OFF.
a. If this
present
voltage is present, perform
TRANSISTOR
TEST.
b. If transistor module test is
OK, then the Power Board
could be faulty. Replace.
torch trigger. Turn
voltage IS NOT
or an incorrect
MODULE