Lincoln Electric 405M, 355M service manual 16TROUBLESHOOTING and REPAIRF-16, Test Procedure

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F-16TROUBLESHOOTING AND REPAIRF-16

MAIN SWITCH BOARD TEST (continued)

FIGURE F.2 MAIN SWITCH BOARD LEAD LOCATIONS

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207

- +

202

J22

- +

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201

208

J21

- +

204

205

- +

209

J20

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203 206

TEST PROCEDURE

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1.Remove input power to the POWER WAVE 355M/405M.

2.Using a 5/16” nut driver, remove the case wraparound.

3.Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.

4.Using a 7/16” wrench locate, label and remove leads 201, 202, 203, 204, 205, 206, 207 and 208 from the switch board. Note lead and washer placement for reassembly. Clear leads.

5.Using the Analog ohmmeter, perform the resis- tance tests detailed in Table F.1. Refer to fig- ure F.2 for test point locations. Note: Test using an Analog ohmmeter on the Rx1 range. Make sure the test probes are making electri- cal contact with the conductor surfaces on the PC board.

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POWER WAVE 355M/405M