Orban OPTIMOD-FM 5500 Operation Manual page 197

OPTIMOD-FM DIGITAL
9. Replacing the Composite/SCA Daughterboard
Referring to step 3, follow the instructions in reverse.
10. Replacing the Front Panel Assembly:
A) Set the front panel, face down, on a soft cloth to prevent scratches.
B) Lightly reattach the bottom and top circuit boards by mating the four plugs
and jacks. Use care to align the pins with the jacks so that all pins are correctly
aligned and no pins are bent. Do not push the pins all the way into the jacks
yet; leave room between the upper and lower boards for spacers.
C) Reattach the board assembly to the front panel using the eight #1 Philips-
head screws and spacers removed in step (2.E) on page 4-2:
a) Thread each screw through a spacer placed between the upper and lower
circuit boards.
b) Push down the top board until it rests on the spacers.
c) Align the screws with the threaded standoffs on the front panel.
d) Evenly tighten all eight screws to reattach the board assembly to the panel.
D) Place the two side brackets over the captive screws located on each side of the
front panel. Be sure that the large side of each bracket is oriented toward the
rack-screw cutouts in the panel.
E) Place the metal shield over the captive screws on each side of the front panel.
Align the shield so that its cutouts are aligned with the cables attached to the
circuit board assembly. Using a 3/16" nut driver, screw four hex nuts onto the
captive screws.
F) Attach the front panel assembly to the unit:
a) Verify that all cables are dressed through cutouts in the shield.
b) Slide the front panel assembly into the front of the chassis so that the three
threaded holes in the side brackets line up with the holes in the sides of the
chassis.
c) Attach the front panel assembly by screwing the six screws removed in step
(2.B)a) on page 4-2 into the holes in the sides of the chassis.
G) Reattach the four cables that connect the display board to the control board.
Each cable has a different type or size of connector, so it is obvious which ca-
ble mates with which jack on the control board.
Carefully align the cables and connectors to avoid bending the pins.
11. Replacing the Top Cover:
Place the cover on the unit and reinstall the Phillips screws. (Be careful not to
pinch any cables.)
4-5
MAINTENANCE