Orban OPTIMOD-FM 5500 Operation Manual page 195

OPTIMOD-FM DIGITAL
B) Using a deep hex nut driver (preferred), a small crescent wrench, or a pair of
slip-joint pliers (in an emergency), remove the nuts and lockwashers holding
the four BNC connectors to the chassis.
The Composite/SCA daughterboard can now be removed.
4. Removing the Control board:
A) If you have not yet done so, remove the top cover and Composite/SCA daugh-
terboard (steps 1 and 3, above).
B) Using a 3/16-inch hex nut driver, remove the four hex nuts holding the DB-25
and DB-9 connectors to the rear panel of the chassis.
C) If you have yet not done so, remove the cables that connect the display as-
sembly to the control board (step 2 on page 4-2).
D) Disconnect the ribbon cable connecting the control board to the I/O+DSP
board.
E) Disconnect the short two-conductor cable that connects the control board to
the I/O+DSP board.
F) Using a #1 Philips screwdriver, remove the four corner screws holding the con-
trol board to the chassis standoffs.
G) The control board is now free and can be removed from the chassis.
5. Removing the I/O+DSP (Input/Output+DSP) Board:
A) If you have not yet done so, remove the top cover (steps 1 above).
B) Unlock all XLR connectors: Using a jeweler's screwdriver, engage the locking
mechanism (in the center of the triangle formed by the three contact pins)
and turn counterclockwise until the XLR connector is no longer attached.
C) Using a deep hex nut driver (preferred), a small crescent wrench, or a pair of
slip-joint pliers (in an emergency), remove the nut and lockwasher fastening
the BNC connector to the chassis.
D) If you have not yet done so, disconnect the ribbon cable that connects the
I/O+DSP board to the control board.
E) If you have not yet done so, disconnect the short two-conductor cable that
connects the I/O+DSP board to the control board.
F) Disconnect the cable connecting the power supply to the I/O+DSP board.
There are two connectors; unplug both. Note the lead dress so you can reas-
semble the unit correctly.
G) If you have not yet done so, disconnect the cable going to the Composite/SCA
daughterboard.
H) Remove the thirteen #1 Phillips screws (and their washers) that connect the
I/O+DSP board to the chassis.
4-3
MAINTENANCE