Test Procedures - Lincoln Electric LN-8 SVM132-A Service Manual

F-13
TRIGGER TRANSFORMER TEST
6 5 4
3 2 1
BLACK BLACK
TEST PROCEDURE
1. Remove input power to the LN-8.
2. Using the 5/16 in. nutdriver,
remove the screws holding the left
side cover assembly.
3. Disconnect the Molex plug from
the under-side of the relay board.
See Figure F.2.
4. Apply power (115VAC) to the
black primary transformer leads,
pins 2 and 3.
TROUBLESHOOTING AND REPAIR
FIGURE F.2 – TRIGGER TRANSFORMER TEST POINTS
RED
(continued)
RELAY
BOARD
5. Using the voltmeter, check for
approximately 24VAC at the red
secondary leads, pins 1 and 4.
6. If 115VAC is applied to the black
primary leads (2 and 3) and the
secondary voltage (red leads 1
and 4) is missing or low, the trig-
ger transformer may be faulty.
Replace.
7. Reconnect the Molex plug to the
underside of the relay board.
8. Install the screws that secure the
left side cover assembly.
LN-8
F-13