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TROUBLESHOOTING & REPAIR
PROTECTION PC BOARD TEST (continued)
FIGURE F.11- PROTECTION PC BOARD LOCATION AND MOUNTING DETAILS
6 5 | J23 | 2 1 | PROTECTION |
7 | 3 | WAVE | |
8 |
| 4 | SQUARE |
4 |
| 1 |
|
5 | J22 | 2 | ] |
6 |
| 3 |
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TEST PROCEDURE
1.Remove input power to the machine.
2.With the 5/16" nut driver, remove the screws and carefully lower the front control panel.
3.Remove plugs J22 and J23 from the pro- tection PC board. See Figure F.11 for loca- tion.
4.With the phillips head screw driver, remove the three screws mounting the protection PC board to the front panel. Note washer placement.
5.Carefully remove the protection PC board.
6.Test for the resistances between the check points listed on the Protection PC Board Resistance Test Points Chart.
•If any of the resistances are out of specifica- tion, replace the protection PC board.
7.After the tests are complete and the prob- lem repaired, install and connect the pro- tection PC board.
•Carefully mount the protection PC board to the front panel. Take note of the washer placement; the washers must be replaced correctly to be sure that the protection PC board is grounded properly. See Figure F.11.
•Connect plugs J22 and J23.
8.Install the front control panel, using the 5/16" nut driver.
SQUARE WAVE TIG 355
