Open Circuit Voltage Check - Thermal Dynamics CUTSKILL C-35C Service Manual

6.04 Open Circuit Voltage Check

1. Unplug the CN1 connector on the H/V (spark gap) PCB.
2. Turn unit power on.
3. Measure terminal TB2, Pins 1 and 3. It should be 230VAC.
4. Measure output voltage on Input diode (+ and -). It should be 325VDC.
5. Depress and hold the torch trigger for each of the following checks /steps, numbers 6 - 9. Each check has to be
done within the 3-5 second pilot arc time. If not, then the trigger will have to be releaed and then depressed
again.
6. Check for illumination of the "SOL" LED and that the "EN" (Enable) LED brightens on the Logic PCB.
7. Measure output to Main Transformer Input between points 5 and 6 in Illustration 6-2 above. It should be
220VAC.
8. Measure Main Transformer secondary voltage between points 3 and 4 in Illustration 6-2 above. It should be
190VAC.
9. Measure output OCV between points 1 and 2 in Illustration 6-2 above. It should be 325VDC.
10. Turn off the unit power and plug the connector back in to CN1, removed in step 1 above.
TROUBLE SHOOTING
1
4
3
2
Illustration 6-2
6-4
5
6
Art # A-06991
Manual 0-4745