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TROUBLESHOOTING & REPAIR
SCR/DIODE RECTIFICER ASSEMBLY
REMOVAL AND REPLACEMENT (continued)
FIGURE F.27 – SCR/DIODE ASSEMBLY DETAILS
CHOKE
GLASTIC
STIFFENERS
SECONDARY
LEADS
MOUNTING
BRACKETS
PROCEDURE
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1.Remove the main input supply power to the machine.
2.With the 5/16” nut driver, remove the case top and sides. Lower the front control panel.
3.Using the 5/16” wrench, remove the six screws mounting the front assembly to the machine’s base. Carefully “inch” the front forward to make room for the removal of the SCR/diode bridge assembly.
4.Remove the two screws holding the air deflector (R3R 500 only) to the front panel. Remove the air deflector.
5.Remove the glastic stiffeners (one on each
6.Remove the choke from the left side of the negative heat sink plate. See Figure F.27.
7.Remove the two #220 leads from the right side of the negative heat sink plate.
8.Remove the positive lead and shunt from the positive heat sink plate. See Figure F.27.
9.Remove the gate leads from the control board (either plug J4 or individual gate leads).
10.Remove the three heavy aluminum sec- ondary leads and snubber leads from the SCR finned heat sinks. (Note lead placement for reassembly.)
11.Remove the four nuts and associated wash- ers that hold the SCR/diode assembly to the mounting brackets.
12.Carefully lift and remove the SCR/diode heat sink assembly from the machine. Clear any necessary leads that might hinder removal.
