Lincoln Electric INVERTEC V275-S Service Manual page 60

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AUXILIARY TRANSFORMER TEST (continued)
TEST PROCEDURE
1. Remove input power to the V275-S.
2. Using a 5/16" nut driver, remove the case
wraparound cover.
3. Perform the Input Capacitor Discharge
Procedure detailed earlier in this section.
4. Locate the auxiliary transformer. See Figure
F.10.
5. Locate leads 387 and 388 and also plug J2
pins 1 and 2. See Figures F.11 and F.12.
6. Carefully apply the correct input power to
the V275-S.
7. Make sure the reconnect jumper "A" and
reconnect switches are configured correctly
for the input voltage being applied to the
machine.
TROUBLESHOOTING & REPAIR
FIGURE F.10 - Auxiliary Transformer
Auxiliary
Transformer
V275-S
Control
Board
380V
208-230V
8. Carefully check for the presence of 18VAC
at plug J2 pin 1 (lead 387) to pin 2 (lead 388).
NOTE: The secondary voltage may vary if
the input line voltage varies.
9. If the 18VAC is present the auxiliary trans-
former is functioning properly.
10. If the 18VAC is not present check the 0.6
amp fuse in the transformers primary circuit.
See the Wiring Diagram.
11. Also make certain that the correct input volt-
age is being applied to the transformer and
the wiring is not loose or faulty. See the
Wiring Diagram.
12. If the correct primary voltage is being
applied to the auxiliary transformer but the
18VAC secondary voltage is NOT present
the transformer may be faulty.
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