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F-78

F-78

TROUBLESHOOTING & REPAIR

SNUBBER AND BLEEDER RESISTOR TEST (continued)

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C. With the volt/ohmmeter, check for 25 ohms resistance between lead #404 and #9F.

If the measurement reads between 20 and 30 ohms, resistor R4 and leads #404 and #9F are okay. Go to step D.

If the measurement does not read between 20 and 30 ohms, check for continuity in leads #404 and #9F. Then test for 25 ohms resistance across R4 directly. If the mea- surement does not read between 20 and 30 ohms, replace resistor R4.

D.Reconnect quick connect terminals #403, #404, #9, and #12 on switch board 2.

Switch Board 3: (Switch Board 3 is Marked CAP 1 on the Switch Board Assembly Connection Decal - See Figure F.24.)

A.Remove quick connect terminals #405, #406, #9, and #12 from switch board 3.

B.With the volt/ohmmeter, check for 25 ohms resistance between lead #405 and #12G.

If the measurement reads between 20 and 30 ohms, resistor R5 and leads #405 and #12G are okay. Go to step C.

If the measurement does not read between 20 and 30 ohms, check for continuity in leads #405 and #12G. Then test for 25 ohms resistance across R5 directly. If the measurement does not read between 20 and 30 ohms, replace resistor R5.

C.With the volt/ohmmeter, check for 25 ohms resistance between lead #406 and #9G.

If the measurement reads between 20 and 30 ohms, resistor R6 and leads #406 and #9G are okay. Go to step D.

If the measurement does not read between 20 and 30 ohms, check for continuity in leads #406 and #9G. Then test for 25 ohms resistance across R5 directly. If the measurement does not read between 20 and 30 ohms, replace resistor R5.

D.With the volt/ohmmeter, check for 7.5 K- ohms resistance between lead #12G (12M) and #9G (9M).

If the measurement reads between 6.75 and 8.25 K-ohms, resistor R10 and leads #12G (12M) and #9G (9M) are okay. Go to step E.

If the measurement does not read between

6.75 and 30 K-ohms, check for continuity in leads #12G (12M) and #9G (9M). Then test for 7.5 K-ohms resistance across R10 directly. If the measurement does not read between 6.75 and 8.25 K-ohms, replace resistor R10.

E.Reconnect quick connect terminals #405, #406, #9, and #12 on switch board 3.

Switch Board 4: (Switch Board 4 is Marked CAP 4 on the Switch Board Assembly Connection Label - See Figure F.24.)

A.Remove quick connect terminals #407, #408, #9, and #12 from switch board 4.

B.With the volt/ohmmeter, check for 25 ohms resistance between lead #407 and #12H.

If the measurement reads between 20 and 30 ohms, resistor R7 and leads #407 and #12H are okay. Go to step C.

If the measurement does not read between 20 and 30 ohms, check for continuity in leads #407 and #12H. Then test for 25 ohms resistance across R3 directly. If the measurement does not read between 20 and 30 ohms, replace resistor R7.

C.With the volt/ohmmeter, check for 25 ohms resistance between lead #408 and #9H.

If the measurement reads between 20 and 30 ohms, resistor R8 and leads #408 and #9H are okay. Go to step D.

If the measurement does not read between 20 and 30 ohms, check for continuity in leads #408 and #9H. Then test for 25 ohms resistance across R8 directly. If the measurement does not read between 20 and 30 ohms, replace resistor R8.

D.Reconnect quick connect terminals #407, #408, #9, and #12 on switch board 4.

8.Install the machine case sides and top.

9.Install the handle and the lift bail rubber gasket.

POWER WAVE 450

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Lincoln Electric SVM112-B service manual Toc