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F-27 F-27
POWER BOARD VOLTAGE TEST CHART
TROUBLESHOOTING & REPAIR
SQUARE WAVE TIG 355
Check Points
IJ4 to 2J4
4J4 to 6J4
4J4 to 5J4
10J4 to 12J4
3J2(+) to 5J2
4J2(-) to 5J2
IJ2(+) to 2J2
Signals Being
Checked
AC supply voltage
from T5 transformer
AC supply voltage
from T5 transformer
AC supply voltage
from T5 transformer
AC supply voltage
from T5 transformer
Regulated +15VDC
Regulated -15VDC
Unregulated DC
Expected
Reading
10VAC
32VAC
16VAC
36VAC
+15VDC
-15VDC
+14VDC
Special Conditions
for Test
None
None
None
None
LED 1 ON
LED 2 ON
None
Note: LED 3 should be ON when gate signal is applied to SCR 1.
LED 4 should be ONE when gate signal is applied to SCR 4.