Comtech EF Data SDR-54A - Manual (Page 42)

SDR-54A Satellite Demodulator Revision 4
DEMUX Option MN/SDR54A.IOM
5.3.2 Installation
Install the DEMUX 8-Channel card as follows:
1. Remove the six 6-32 pan head screws which secure the cover to the chassis.
Note: The cover and chassis are held together by flange tabs located on the top
and bottom surfaces.
2. Remove the cover from the chassis as follows:
a. Two extraction slots near the front of the unit are located on the top surface.
b. Separate the chassis and cover by placing a screw driver into the extraction
slots and twisting.
Note: To remove the chassis from the cover, gently pry the chassis and cover
away from each other.
c. A ribbon connection between the front panel and the main PCB will allow
for the removal of the chassis without disconnecting the front panel.
CAUTION
Use Electrostatic Discharge (ESD) precautionary procedures when
touching, removing, or inserting PCBs.
3. Install connector/ribbon assemblies at the J5 and J6 position as follows:
a. Remove the two blank cover plates installed over J5 and J6 slots, located on
the rear panel of the unit.
b. Install the two 25-pin D-sub connector/ribbon cable assemblies to the rear
panel of the unit.
Note: The ribbon cable assemblies are of slightly different size:
1. Install the longer ribbon cable assembly into J5.
2. Install the shorter cable assembly into J6.
4. Locate the DEMUX mounting location at the right rear of the demodulator PCB,
as shown in Figure 5-4.
5-8