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PROCEDURE
1.Remove input power to the machine.
2.With the 5/16" nut driver, remove the case top and sides.
3.Perform the Input Power Factor Capacitor Voltage Check.
For Steps
4.Remove plug J1 from the power PC board.
5.With the 1/2" wrench, remove the choke lead from the negative plate.
6.With the 1/2" wrench, remove the X1 lead from SCR1 - SCR4 junction. Note lead placement for reassembly: X1 is sand- wiched between the two leads from the output rectifier bridge.
7.With the 1/2" wrench, remove the lead at the SCR2 - SCR3 junction leading to the polarity switch (S1). Note lead placement for reassembly.
8.With the 1/2" wrench, remove the lead from the positive plate leading to the polarity switch (S1).
9.With the 7/16" wrench, remove the small lead from the negative plate leading to CR3 relay.
10.With the 7/16" wrench, remove D1, D2 and the copper strap lead assembly from the insulated stud on the negative plate.
11.Remove leads #215 and #264 from the R7 resistor.
12.Remove leads #213 and #214/214A from the background rectifier. Separate leads #214 and #214A and pull them through. Cut any necessary cable ties.
13.Remove (cut or unsolder) lead #212 from the R3 resistor.
14.Remove leads #210 and #211 from plug J1 (Located at power board. See wiring diagram). Use a molex pin extractor. Note lead placement for reassembly.
15.With the 7/16" wrench, remove the four nuts, lock washers, and two flat washers mounting the rectifier assembly to the main transformer iron. NOTE: The two flat washers are located on the right hand mounting screws.
16.Carefully remove the rectifier, snubber, and torriod assembly.
17.Reassembly: carefully mount the rectifier, snubber, and torriod assembly onto the main transformer iron. With the 7/16" wrench, fasten the assembly down with the flat washers, lock washers, and nuts. Note that the two flat washers are located on the the right hand mounting screws.
18.Attach lead #212 to the R3 resistor. (Splice or solder the connection.)
19.Route leads #213 and #214/214A and attach them to the background rectifier. Replace any necessary cable ties.
20.Attach leads #215 and #264 to the R7 resistor.
21.With the 7/16" wrench, attach D1, D2 and the copper strap lead assembly to the insulated stud on the negative plate. Attach the small lead from the CR3 relay to the negative plate.
22.With the 1/2" wrench, attach the lead from the polarity switch (S1) to the positive plate.
23.With the 1/2" wrench, attach the lead from the polarity switch (S1) at the SCR2 - SCR3 junction.
24.With the 1/2" wrench, attach the X1 lead to the SCR1 - SCR4 junction. X1 is sand- wiched between the two leads from the output rectifier bridge.
25.With the 1/2" wrench, attach the choke lead to the negative plate.
26.Attach plug J1 to the power PC board.
27.With the 5/16" nut driver, install the case top and sides.
SQUARE WAVE TIG 355
