MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
36
January 2000
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Leveling
The CTU must be level when installed.
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Location
No other items should be placed on top of the CTU or cables. Make sure that the CTU is
not exposed to rain or other sources of moisture. The installation surface must have
sufficient strength. If the location selected is not strong enough, an alternate location
must be selected or an appropriate surface must be constructed. The installation area
must not be easily vibrated or exposed to impact. The CTU should be installed so that it
is out of the way and protected, but it should also be in a location that is accessible for
servicing. Avoid installing the CTU near the area where heat is generated or where the
CTU may be artificially heated to a high temperature.
There should be a minimum of two inches of air space surrounding the CTU to provide adequate
convection cooling. This means that when installed, the CTU should not be in an area where
items (rags, carpet, paper or accidentally placed objects) may cover the CTU, and would contain
the heat generated by the CTU.
♦
Torque Specifications
The bolts used to mount the CTU should not be over-torqued. The torque specifications
for these bolts is 24 in./lb. Do not use air impact tools for tightening these bolts.
♦
Cables and Connectors
The CTU should be positioned in the site so that the connectors from the AU, handsets
and DTE, and power cables are protected. Make provisions to allow at least two inches
of straight cable available at the connection point(s) of the CTU.
Be sure to route cables where they won't get pinched or stepped on, and where they will not
make any sharp turns. If possible, the power cable should be run with the other site power
connections. Any excessive cabling should be secured to a fixed object in the site with cable
ties, or stowed out of sight. Use grommets for routing cable through holes drilled in metal or
through bulkheads. Use silicone sealant (RTV) to weatherproof all holes that are drilled in the
site.
CTU Installation Steps
Required tools:
#2 Phillips screwdriver and drill (3.6mm).
a.
Install “Angle Bracket-A” to both sides of the CTU. Find a level and stable area in
the site. Mark the installation surface at the position of the four oval holes on the
lower side of “Angle Bracket-A”. Make sure that the installed CTU does not interfere
or make it difficult to perform standard operation procedures.
b.
Use the drill to make holes 3.6 mm in diameter at the marked positions on the floor.
