Troubleshooting
6-134 Manual # 42-02-7223
1. Disconnect all connections to the board (J1-J10 and the ribbon cable ground wire
attached to the bottom right corner mounting screw).
2. Remove the mounting screws and the board. Ensure that no loose parts fall into the
drive.
3. Install the new board and torque the mounting screws to 15-20 inch pounds. Please
refer to “SCR-LGA Board Jumper Settings for use with iControl” on page 6-119 and See
“SCR-LGA Board Layout” on page 120..
4. Reinstall the board connectors (J1-J10 and the ground wire). Ensure that the bottom
right corner mounting screw is torqued to 15-20 inch pounds.
Replacing the SCR-PS Board Only The SCR-PS board supplies DC power to the
SCR-LGA board. Ensure that the new SCR-PS board is generating the correct DC voltage before
connecting it to the SCR-LGA board. Please refer to “Replacing the SCR-LGA SCR Drive Logic
Board” on page 6-133 for an illustration.
1. Disconnect the ribbon cable from SCR-LGA board J9 and remove the 6 position IDC
from J1 on the SCR-PS board.
2. Remove the mounting screws and remove the board.
3. Install the board and torque the screws to 15-20 inch pounds.
4. Connect the ribbon cable from the SCR-PS board to J9 on the SCR-LGA board. Recon-
nect the 6 position IDC to J1 on the SCR-PS board.
5. Test the SCR-PS board for the correct voltage:
• Disconnect the ribbon cable from J9 on the SCR-LGA board.
• Turn ON power to the enclosure at the main disconnect. Ensure that the controller is
on Inspection.
• Using a DC voltmeter, verify +5V, -5V, +15V, and -15V on the test points on the SCR-
PS board. If the voltages are not within ±1% of the correct value, adjust the following
on the SCR-PS board: R16 for +5V, R2 for -5V, R13 for +15V, or R5 for -15V.
• Turn power OFF at the main disconnect. Reconnect the ribbon cable to J9 on the SCR-
LGA board and turn power ON at the main disconnect.
Table 6.40 Replacement Parts for SCR-LGA
ITEM (DESCRIPTION) MCE PART # UNIT
SCR-LGA (SCR Drive Logic Board) SCR-LGA Each
Mach. Screw (8-32 x 1/2" Mach. Screw) 19-01-0070 Each
Star Lock Washer (#8 Star Lock Washer) 19-01-0017 Each
Table 6.41 Replacement Parts for SCR-PS
ITEM (DESCRIPTION) MCE PART # UNIT
SCR-PS (SCR Drive Power Supply Board) SCR-PS Each
Mach. Screw (8-32 x 1/2" Mach. Screw) 19-01-0070 Each
Star Lock Washer (#8 Star Lock Washer) 19-01-0017 Each
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