Lincoln Electric SVM101-B service manual 313 306 J15 275F 311 V300-I

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F-19 TROUBLESHOOTING & REPAIR F-19

PROTECTION BOARD OUTPUT TEST(cont.)

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TEST PROCEDURE

8.With power OFF, disconnect J8 and attach voltage probes into back of wire harness lead junction block (J8). See Figure F.5.

Insert probes into back of the connection cavities for leads 313 (-) and 311 (+) of Protection Board. Make sure contact is made with conductor materi- al.

NOTE: Right-angle, thin-gauge probes are best for this test.

With probes attached, plug the (J8) block into the PC board.

9.Turn main power ON.

10.Move Output Terminal Switch S4 to ON position on Control Panel.

11.Test for less than 1 VDC between leads 313 (-) and 311 (+).

a.If less than 1 VDC is measured, test is OK and Protection Board is functioning properly.

b.If more than 5 VDC is measured, go to Static Capacitor Balance Test.

NOTE: During voltage test, be cautious when posi- tioning loose components to avoid shorts and dam- age to equipment.

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FIGURE F.5 - INSERTING PROBES

L7915 PROTECTION

313

306

J8 J15

275F

311

V300-I