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TROUBLESHOOTING & REPAIR | ||
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SCR OUTPUT BRIDGE REPLACEMENT
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SCR OUTPUT BRIDGE
REMOVAL
1.Remove input power to machine.
2.Using a 5/16 (8mm) nut driver or flat head screw driver, remove 20 screws (ten per side) to remove case sides and 2 screws to remove top.
3.Using a 5/16 (8mm) nut driver or flat head screw driver, remove 6 screws, then lower the front control panel.
4.Remove the J4 gate lead Molex plug from firing board, and feed the plug down through the hole in bot- tom of the PC board compartment.
5.Using a 9/16” socket and
6.Using a 5/16” socket remove the screw and small reed switch lead (#210) from the left, top rear SCR heat sink.
NOTE: It may be necessary to move or remove the output choke to gain access to the bottom anode leads. For access to the bottom middle screw, nut, and associated washers, a long handled flat ratchet is recommended.
7.Identify and label the six trans- former secondary (heavy alu- minum) leads that connect to the anodes of the SCR heat sink assemblies. Using a 1/2” socket and
8.Support the SCR bridge assembly with a lift hook or rope.
9.Using a 3/8” socket wrench, remove the two screws (one on each side) holding the SCR assem- bly rails to the front panel assem- bly.
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