Lincoln Electric INVERTEC V275-S Service Manual page 72

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TEST PROCEDURE
1. Remove input power to the V275-S machine.
2. Using a 5/16" nut driver, remove the case wrap-
around cover.
3. Perform the Capacitor Discharge Procedure
detailed earlier in this section.
4. Locate plug J2 on the control board and dis-
connect it. See Figure F.20.
5. Apply the correct input power to the V275-S
and carefully check for the presence of 18VAC
from J2 pin 1 (lead 387) to pin 2 (lead 388).
This is the AC supply from the auxiliary trans-
former. If this voltage is not correct, perform
the Auxiliary Transformer Test and check
associated wiring.
Remove input power and reconnect plug J2
into the control board. See Figure F.21.
TROUBLESHOOTING AND REPAIR
CONTROL BOARD TEST (continued)
See the wiring diagram.
FIGURE F.19 - Control Board & Plug J10 Location
Control Board
Plug J10
6. Locate plug J10 on the main switch board.
See Figure F.19.
7. Disconnect plug J10 from the switch board.
8. Carefully install a jumper wire from pin 7 (lead
313) to pin 1 (lead 311). This will send a signal
to the control board that there are not any
faults being detected on the switch board from
the input capacitors. See Figure F.22.
9. Set the Mode switch to the Stick position and
the Local/Remote switch to the Local position.
10. Install a 10K ohm resistor from plug J10 pin 8
(lead 307) to pin 4 (lead 310).
V275-S
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