Orban Optimod-FM 8300 Operating Manual page 195

OPTIMOD-FM DIGITAL
9. Reattaching the Power Supply Board:
A) Set power supply board into main chassis, so that it aligns with its mounting
holes.
B) Replace the two Phillips screws that hold the IEC connector.
C) Replace the nine #1 Phillips screws that hold the heat sink to the side of the
chassis. If necessary, add additional heat sink compound to ensure a reliable
thermal connection between the heat sink and the chassis.
D) Replace the ground wire nut.
E) Replace the three Phillips screws that hold the power supply board to the
main chassis.
F) Reattach the two plugs that connect the power supply board to the trans-
former.
G) Reattach the two plugs for the power distribution wiring harnesses.
10. Replacing the Base Board, I/O Board, and DSP board:
Referring to steps 5 – 7, follow the instructions in reverse.
Note that you cannot replace the RS-232 board and the CPU board until you
have replaced the base board.
11. Replacing the CPU Board:
Referring to step 4, follow the instructions in reverse.
12. Replacing the RS-232 Board:
Referring to step 3, follow the instructions in reverse.
13. Replacing the Front Panel Assembly:
A) Set the display assembly in place so that it aligns with its mounting holes.
B) Replace the ten gold-colored screws that connect the display board to the
front of the chassis.
C) Reattach the five cables that connect the display board to the base board.
Each cable has a different type or size of connector, so it is obvious which ca-
ble mates with which jack on the base board.
D) Attach the front panel assembly to the unit.
a) Line up the plastic front panel and snap it back on, making sure each key
pad button feeds through its respective hole properly.
b) Reattach the ground lug that connects the panel's ground wire to the
chassis.
Use a ¼-inch nut driver or needle-nose pliers.
4-5
MAINTENANCE