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TROUBLESHOOTING
SCR/DIODE RECTIFICER ASSEMBLY
REMOVAL AND REPLACEMENT (continued)
REASSEMBLY
13.For reassembly, carefully place the SCR/ diode assembly into position on the mounting brackets.
14.Replace and tighten the four nuts and lockwash- ers that hold the SCR/diode assembly to the mounting brackets.
15.Reattach the three heavy aluminum secondary leads and snubber leads to the SCR finned heat sinks. Apply a thin coating of Dow Corning 340 heat sink compound to connection points.
16.Attach plug J4 (or individual gate leads) to the control board.
17.Attach the positive lead and shunt to the positive heat sink plate.
18.Attach the two #220 leads to the right side of the negative heat sink plate.
19.Connect the choke switch lead to the left side of the negative heat sink plate. See Figure F.27.
20.Install the glastic stiffeners to the left and right sides. See Figure F.27.
21.Attach the air deflector to the front panel (R3R 500). See Figure F.27.
22.Check all lead placements and secure.
23.Attach the front assembly to the machine’s base.
24.Install the front control panel and case top and sides.
