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| TROUBLESHOOTING & REPAIR |
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ARC START TRIGGER CIRCUIT TEST (continued) |
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| CONTROL BOX | SUPORT CASE BACK |
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| AND CENTER BAFFLE |
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| CONTROL BOARD LOCATED INSIDE |
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| WITH WOOD 2 X 4 |
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PROTECTION/SNUBBER BOARD
LOCATED ON BACK OF CONTROL BOX
FIGURE F.7 - LOCATION OF PROTECTION/SNUBBER BOARD.
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TEST PROCEDURE
1.Remove main supply power to machine
2.Remove plug J6 from the control board
3.Close the arc start switch or jumper pins “D” and “E” at the six pin amphenol receptacle.
4.Check for continuity between pins 10J6 and 3J6 at plug J6 on the wiring har- ness. Refer to Figure F.8. If 8.4 ohms to 6.0 ohms resistance is indicated then arc start trigger circuit is okay. If a high resistance or open is read then proceed to Step 5.
Note: If arc start switch is opened or jumper removed from pins “D” and “E” the measured resistance in Step 4 should be infinite.
5Test the resistance between 10J6 plug and 10J12 on the projection/snubber board. Also check resistance from 3J6 plug to 3J12 on the projection/ snubber board.
A.If zero ohms resistance is indicated, test is okay. Go to Step 6.
B.If a resistance of any value is shown, check wires and connec-
tions.
10J6
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3J6
PLUG J6 REMOVED
J2 | J3 |
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J1 | J4 | J5 | J6 | J7 | J8 |
G2150 |
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SQUARE WAVE 255 CONTROL |
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