Lincoln Electric INVERTEC STT Series Service Manual page 80

F-39
309
310
J7
501
504
4. Secure and insulate the front panel assembly
for POWER ON testing.
ELECTRIC SHOCK can kill.
TROUBLESHOOTING & REPAIR
POWER BOARD TEST (continued)
FIGURE F.15 – POWER PC BOARD TEST POINTS
L8033
WARNING
• With input power ON,
there are high voltages
inside the machine.
not reach into the machine
or touch any internal part.
INVERTEC STT
POWER BOARD
J14
311
313
5. Apply the correct input power and turn ON the
machine.
6. Carefully test for 18VAC input from the T1
Auxiliary Transformer between plug J7 pin 5
(lead#501) and plug J7 pin 6 (lead #504) at
the power PC board. See Figure F. 15.
NOTE: If the 18VAC is NOT present, perform
the T1 Auxiliary Transformer Test. Also check
associated wiring. See the Wiring Diagram.
Do
F-39
301
212A
302
J6
275
211A
305