Comtech EF Data SDM-300A - Manual (Page 65)

SDM-300A Satellite Modem Revision 6
Installation/Upgrades MN/SDM300A.IOM
3–9
3.5.2 Installation
The following tool is required to install the Turbo Codec card:
Description Application
Phillips  Screwdriver To remove and replace cross-point screws.
PLCC, Type IC Puller To firmware IC’s from the Main PCB.
SDM-300A Satellite Modem shall have Revision C (or later) Main board for Turbo upgrade.
There are two ways to determine the revision status:
Method 1:
Provide the Serial Number of the modem to Comtech EF Data for verification
of the revision status.
Method 2: If the first two digits of the modem Serial Number begin with 99, 00, or 01,
corresponding to the year of the manufacture, then the modem Main board is
Revision C.
a. If the Serial Number starts with 98 then it is either Revision B or
Revision C and it is necessary to check with Comtech EF Data
Customer Support department.
b. Serial Numbers beginning with 97 or subsequent are not eligible for
upgrade.
Install the Turbo Codec Card on the Main PCB:
Refer Figure 3-4 for installation location of the Turbo Codec card.
CAUTION
Turn the power off before installation. High current VDC is present. Failure
to do so could result in damage to modem components.
1. Turn off the modem and unplug the power supply.
2. Remove the rear panel retaining screws. Using the finger pulls, slide the main modem
assembly out from the rear of the modem chassis.
3. If required: Card #1 Overhead Board Removal – Remove the four rear panel screws
around the 50-pin I/O switch module. Unplug the I/O module, and then remove the
seven mounting screws around the 50-pin I/O switch module. Unplug the I/O module,
then remove the seven mounting screws holding the Overhead board and carefully lift
the board out.
4. If required: Reed-Solomon Removal – Remove the Reed-Solomon boards from the
SIMM sockets by pushing the spring clips outward while the rocking the board
vertically, then lift the board out.
5. Turbo Codec Installation – Align the Turbo board with either of the SIMM sockets
while holding it vertically with components toward the Rear panel. Seat the connector
into the socket and tilt the board toward the Front Panel until the spring clips lock the
board into place.
6. Replace the top cover and reinstalled the two side screws.
7. Turn on the AC power. Modem will reinitialize.