Orban Optimod-FM 8300 Operating Manual page 194

4-4
MAINTENANCE
E) Remove the ribbon cable that connects the I/O board to the DSP board.
F) Remove the ribbon cable connecting the power supply to the I/O board.
G) Remove the three #1 Phillips screws (and their washers) that connect the I/O
board to the chassis.
H) Carefully pull the I/O board forward to clear the XLRs from their housings, and
then lift the board out of the chassis.
7. Removing the DSP Board:
A) If you have not done so yet, remove the top cover (step 1, above).
B) Remove the ribbon cable that connects the I/O board to the DSP board.
C) Remove the ribbon cable that connects the base board to the DSP board.
D) Remove the plug connecting the power supply wiring harness to the DSP
board.
E) Remove the five #1 Phillips screws (and their washers) that connect the DSP
board to the chassis.
F) Lift the DSP board out of the chassis.
8. Removing the Power Supply Board:
A) If you have not done so yet, remove the top cover (step 1, above).
B) Remove the two plugs that connect the power supply board to the power
transformer.
If present, remove the white fasteners that tie the two cables to the
power supply board.
C) Remove the ribbon cable connecting the power supply to the base board, DSP
board, and I/O board.
D) Remove the nine #1 Phillips screws (and their washers) fastening the heat sink
to the side of the chassis.
E) Remove the nut and star washer from the ground wire with a ¼-inch nut
driver.
F) Remove the two Phillips screws (and matching washers) that hold the IEC (line
cord) connector to the chassis.
G) Remove the three Phillips screws holding the power supply board to the main
chassis.
Note that one screw is located under the safety cover close to the line
voltage selector switch. Lift the cover up to expose the screw.
H) Carefully lift the power supply board up.
ORBAN MODEL 8300