Lincoln Electric SQUARE WAVE TIG 255 SVM100-A Service Manual page 59

TROUBLESHOOTING & REPAIR
CONTROL TRANSFORMER (T2) VOLTAGE TEST (continued)
CONTROL BOX
CONTROL BOARD LOCATED INSIDE
CONTROL TRANSFORMER LOCATED INSIDE
FIGURE F.3 - LOCATION OF CONTROL BOARD AND CONTROL TRANSFORMER.
TEST PROCEDURE
1. Remove main supply power to machine
2. Locate and remove Plug J8 from control
board, located in the control box. Hint:
For ease of testing, secure Plug J8 to
case front with tape.
3. Locate leads #432 and #433 connected
to the control transformer (T2) which is
located in the top of the control box.
4. Turn main power ON
SUPORT CASE BACK
AND CENTER BAFFLE
WITH WOOD 2 X 4
5. Check for 120VAC at leads #432 to
#433
A.. If 120VAC is present at leads #432
to #433, go to Step 8.
Note: If main supply voltage varies,
control transformer voltages will
vary accordingly.
B. If a very low or zero voltage is
shown at leads #432 to #433 then
go to Step 6.
6. Remove main supply power to machine.
SQUARE WAVE TIG 255
F-18