Lincoln Electric 355M Manuel d'utilisateur télécharger pdf (Page 63)

TROUBLESHOOTING AND REPAIR

F-17 F-17

POWER WAVE 355M/405M

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MAIN SWITCH BOARD TEST (continued)

TABLE F.1. SWITCH BOARD RESISTANCE TEST

6. If any test fails replace the switch board. See

Main Switch Board Removal and Replacement.

7. If the switch board resistance tests are OK, check

connections on plugs J20, J21, J22 and all asso-

ciated wiring. See wiring diagram.

8. Reconnect leads 201, 202, 203, 204, 205, 206,

207, and 208 to the switch board. Ensure that the

leads are installed in their proper locations. Pre-

Torque all leads nuts to 25 inch lbs. before tight-

ening them to 44 inch lbs.

9. Replace the case wraparound cover using a 5/16”

nut driver.

APPLY POSITIVE TEST

PROBE TO TERMINAL

APPLY NEGATIVE TEST

PROBE TO TERMINAL

NORMAL

RESISTANCE READING

+206

+208

+202

+201

+205

+203

+204

+207

-205

-203

-204

-207

-206

-208

-202

-201

Greater than 1000 ohms

Less than 100 ohms

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Lincoln Electric 355M Manuel d'utilisateur Page 63

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