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F-53

F-53

TROUBLESHOOTING & REPAIR

POLARITY SWITCH REMOVAL AND REPLACEMENT (continued)

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For Steps 9--17, see Figure F.15 and F.16.

9.With the 1/2” wrench, remove the “POS” flex lead from the polarity switch. See the Wiring Diagram. Label lead and connection point for reassembly.

10.With the 1/2” wrench, remove the “B” flex lead from the polarity switch. This lead con- nects to the AC plate on the SCR bridge. See Wiring Diagram. Label lead and con- nection point for reassembly.

11.Using the 1/2” wrench, remove the “NEG” flex lead from the rear gang of the polarity switch. This lead connects to the D1 diode on the SCR bridge. See the Wiring Diagram. Label lead and connection point for reassem- bly. Also label and remove the D2 diode heat sink assembly.

12.Using the 1/2” wrench, remove the flex lead from the polarity switch. This lead connects to the high frequency transformer coil and the by-pass board. See the Wiring Diagram. Label lead and connection point for reassembly. Also remove lead #252.

13.Using the 1/2” wrench, remove the other flex lead from the polarity switch. This lead con- nects to the upper terminal on the by-pass and the “work” output terminal lead. See the Wiring Diagram. Label lead and connection point for reassembly. Also remove lead #253.

14.Using the 1/2” wrench, remove the choke lead from the polarity switch. See the Wiring Diagram. Label lead and connection point for reassembly.

15.With the 1/2” wrench, remove the X1 sec- ondary lead from the polarity switch. See the Wiring Diagram. Label lead and connection point for reassembly.

16.Carefully unsolder the two leads (#275C and #312) from the microswitch located on the polarity switch assembly. See the Wiring Diagram. Label leads and connections points for reassembly.

17.Remove the cable tie that holds the thermal protection light leads to the polarity switch.

18.With the 7/16” wrench, remove the two nuts and washers that hold the polarity switch to the front panel. See Figure F.14.

19.Carefully remove the polarity switch assem- bly from the machine.

Replacement Procedure

Refer to Figures F.14 - F.16.

1.Mount the polarity switch to the front panel with two nuts and washers.

2.Replace the cable tie holding the thermal pro- tection light leads to the polarity switch.

3.Resolder leads #275C and #312 to the microswitch.

4.Attach the following leads to the polarity switch. See Figures F.15 and F.16.

X1 secondary lead

choke lead

#253 and flex lead

#252 and flex lead

NEG lead (at rear gang)

POS lead

B lead

5.Install the nameplate with 7 rivets.

6.Re-install and secure the three small plastic control knobs.

7.Install the polarity switch handle with the phillips head screw.

8.Install the output control knob with the allen screw.

9.Install the case top and sides.

SQUARE WAVE TIG 275

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Lincoln Electric SVM141-A service manual Replacement Procedure, For Steps 9--17, see Figure F.15 and F.16

SVM141-A specifications

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