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F-25

F-25

 

TROUBLESHOOTING & REPAIR

 

STATIC SCR/DIODE RECTIFIER BRIDGE TEST (continued)

 

FIGURE F.11 – CONTROL BOARD

FIGURE F.12 – CONTROL BOARD

 

G2206 PLUG P4 LOCATION

G1575 LEAD LOCATIONS

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Plug P3

R3R CONTROL

G2206 - [ ]

Plug P4 (Removed)

G1 G2 G3

R3R CONTROL

G1575 - [ ]

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TEST PROCEDURE

1.Disconnect the main input supply power to the machine.

2.With the 5/16” nut driver, remove the case top and sides and lower the front panel.

3.Disconnect the welding cables from the welding output terminals.

4.Disconnect molex plug P4 from control board G2206. See Figure F.11. If the machine has control board G1575, disconnect the individ- ual gate leads G1, G2, G3, and also lead #204. See Figure F.12.

5.Locate and remove molex plug P5 from snubber board M15370. See Figure F.13. If the machine has snubber board M14215, label and disconnect Lead #204 from the out- put shunt. Be sure to disconnect the #204 lead that runs between the snubber board and the output shunt.

6.Locate and remove lead #204 from resistor R3 (40 ohms, 50 watts). See Figure F.14. On R3 reassembly, resolder this lead.

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IDEALARC R3R

Page 59
Image 59
Lincoln Electric R3R-500, R3R-300 service manual Static SCR/DIODE Rectifier Bridge Test