Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual page 78

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TEST PROCEDURE
NOTE: Perform Test A before disassembling the unit
Test A
1. Turn main power OFF.
2. Position yourself at Switch Board area of the
machine (near Case Back) so as to hear the oper-
ation of the control relays.
3. Turn main power ON.
Test B
1. Turn main power OFF.
2. Remove wrap-around cover.
3. Perform Input Filter Capacitor Discharge proce-
dure.
TROUBLESHOOTING & REPAIR
POWER BOARD TEST (cont.)
FIGURE F.22 - REMOVING CONTROLPANEL
V300-PRO
4. Listen for control relays to operate (audible click of
contacts closing) after about a 5-second delay.
a. If audible click of control relay contacts closing
is heard, Power Board is probably OK.
b. If audible click of control relay contacts closing
is not heard, Power Board could be faulty. Go
to Test B.
NOTE: If the relays energize but there is still a
suspicion that the Power Board is faulty, go on to
Test B.
4. Detach Control Panel by removing the four mount-
ing screws. Move the panel to the left to gain
access to the Power Board.
5. Turn main power ON.
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