Lincoln Electric NA-5N Service Manual page 96

F-43
T1 and T2 TRANSFORMER TEST
PROCEDURE
1. Remove all input power to the NA-5.
2. Using 5/16" nutdriver open the con-
trol box PC board access door.
3. Locate the T1 and T2 transformers.
See Figure F.2
4. Locate and remove the two sets of
primary leads (#531B and #532)
from the upper terminal strip TS2.
Label leads for reassembly. See
wiring diagram and Figure F.2
POWER
BOARD
UPPER
TERMINAL
STRIP
T1 TRANSFORMER
T2 TRANSFORMER
TROUBLESHOOTING & REPAIR
FIGURE F.2 T1 AND T2 TRANSFORMERS
NA-5
(Continued)
5. Using the 115VAC supply carefully
apply 115VAC to the T1 primary
leads #531B and #532.
6. Check for approximately 10VAC at
the yellow secondary leads (#601
and #602). See wiring diagram.
F-43
LOGIC
BOARD