Troubleshooting
6-140 Manual # 42-02-7223 C1
Replacing PC Boards
There are a total of 6 boards (SCR-LGD, SCR-LGA, SCR-PS, SCR-SN, SCR-DS and SCR-CC) in
the System 12 SCR Drive. While replacing boards, other parts may require removal. Ensure that
all power is OFF at the main disconnect before removing boards.
Replacing the SCR-LGD Logic Display Board The SCR-LGD board displays the
status of the System 12 Drive.
Figure 6.29 Replacing the SCR-LGD Board
Table 6.31 Replacement Parts for Commutation SCR/Diode and Dual Diode Device
ITEM (DESCRIPTION) MCE PART # UNIT
Thyristor Diode (95 Amp 1400V) 33-03-0018 Each
Thermstrate 41-06-0030 Each
SCR Mounting Plate 40-02-0084 Each
Dual Diode Pack (105 Amp 1500V Diode/Diode) 33-03-0014 Each
Mach. Screw (10-32 x 1/2” Mach. Screw) 19-01-0021 Each
Mach. Screw (10-32 x 3/4” Mach. Screw) 19-01-0021 Each
Star Lock Washer (#10 Star Lock Washer) 19-04-0018 Each
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