Lincoln Electric SVM197-A Procedure - Field Diode Bridge Removal And Replacement, Section TOC

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F-33 TROUBLESHOOTING AND REPAIR F-33

CAPACITOR AND/OR DIODE BRIDGE

REMOVAL AND REPLACEMENT PROCEDURE (continued)

FIGURE F.10 - FIELD DIODE BRIDGE LOCATION

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7A

201

201B

–

200

Feild Diode Bridge

+

9A

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PROCEDURE - FIELD DIODE BRIDGE REMOVAL AND REPLACEMENT

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1.Remove the engine spark plug wire.

2.With the 5/16” nut driver, remove the 8 sheet metal screws that hold the top cover to the control box. Remove the top cover.

3.With the 5/16” nut driver and wrench, remove the 6 screws that hold the control panel in place (2 in the front, 2 in the back, 2 in the bottom). Move the panel aside as far as the leads will allow.

4.Discharge the field capacitor by con- necting the jumper wire clips on the black and the red wire terminals on the top of the capacitor. See Figure F.9 for location. Leave the clips on for at least 5 seconds, then remove.

5.The field diode bridge (D1) is mount- ed to the sheet metal just above the capacitor. See Figure F.9. Remove it using the phillips head screw dri- ver.

6.With the needle nose pliers, gently remove the wires from the field diode bridge. Note lead locations.

7.Replace the wires to their appropri- ate locations on the new diode bridge:

Lead 200 attached to the positive (+) terminal. Depending on the bridge used, this corner may be beveled and/or marked with a + sign.

Lead 201 and 201B are piggy-backed on the negative (–) terminal, which will always be located diagonally across from the positive (+) terminal.

Leads 9A and 7A are attached to the AC side of the bridge and are attached to the other two corner terminals. Either lead can go on either terminal.

8.Mount the field diode bridge using the screw. Use the slot head screw- driver.

9.Check that the leads are not grounded and for clearance and tightness.

10.Replace the control panel and tighten the sheet metal screws with the 5/16” nut driver and 5/16” wrench.

11.Replace the top cover of the con- trol box and tighten the sheet metal screws with the 5/16” nut dri- ver.

12.The flashing diode (D2) is located just above the field capacitor and may be removed by cutting the cable tie.

POWERARC® 5500