Lincoln Electric PRO-CUT 60 SVM104-A Service Manual page 73

TROUBLESHOOTING & REPAIR
HIGH VOLTAGE TRANSFORMER AND CIRCUIT TEST
CONTROL RELAY (CR2)
HIGH VOLTAG E TRANSFORMER
HIGH FREQU ENCY BOARD
FIGURE F.12-High Voltage Test Component Locations
TEST PROCEDURE
NOTE: This test can be performed best
with alligator clips used with the meter
probes.
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 pro-
duced.
1. Connect input power to the machine.
2. Turn ON/OFF Power Switch to OFF.
Test A: Test for 115 VAC primary
voltage to High
Transformer
1. Locate and connect probes to leads
#35 and #31 on Control Relay CR2.
Use alligator clips for best results.
See Figure F.12.
2. Turn ON/OFF Power Switch to ON.
3. Pull the torch trigger to close Control
Relay CR2 contacts.
be present for only ONE SECOND
when the torch trigger is pulled.
NOTE: When using an analog meter, the
pointer will deflect to approximately 20
VAC. This is normal.
4. Turn ON/OFF Power Switch to OFF.
a. If the 115 VAC primary voltage is
Frequency
115 VAC will
not present, Control Relay CR2
or the Control Board could be
faulty. Replace.
F-32
PRO-CUT 60