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SQUARE WAVE TIG 255
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F-18
TROUBLESHOOTING & REPAIR
CONTROL TRANSFORMER (T2) VOLTAGE TEST
(continued)
CONTROL BOX
CONTROL BOARD LOCATED INSIDE
CONTROL TRANSFORMER LOCATED INSIDE
SUPORT CASE BACK
AND CENTER BAFFLE
WITH WOOD 2 X 4
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
FIGURE F.3 - LOCATION OF CONTROL BOARD AND CONTROL TRANSFORMER.
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.