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Section III. MAINTENANCE PROCEDURES
Up
TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
Next
REMOVING AND REPLACING PRINTED CIRCUIT BOARDS A6, A7, A8, A9
TM 11-5805-387-34-2
SCOPE MODULE A2 CRT
DEATH ON CONTACT may result from contact with high voltage in scope module A2. Scope
module contains 1,100 volts dc.
CAUTION
USE CAUTION WHEN EXPOSING OR HANDLING THE CRT
Breakage of the cathode-ray tube (CRT) causes a high velocity scattering of glass fragments
(implosion).  To prevent CRT implosion, avoid rough handling or jarring of the instruments.
Handling of the CRT shall be done only by qualified maintenance personnel using approved
safety masks and gloves.
REMOVE
Loosen the four captive screws holding module to chassis.
Lift out module.
REPLACE
Plug new module into chassis connector.
Tighten the four captive screws to secure module to chassis.
2-9. REMOVING AND REPLACING FRONT PANEL ASSEMBLY
The modem's front panel cannot be removed completely, but it can be swung away from the chassis to allow access
to the components inside.
REMOVE
Remove the lower six screws holding front panel assembly to the right and left sides of the chassis.
NOTE
Do not remove the top shoulder screws. They serve as hinges.
Grasp the sides of the front panel near the bottom edge and pull the panel upward until it is parallel to
the chassis.
Turn the chassis and front panel bottom side up.
Remove the screws holding the cover of the L-shaped compartment housing along the bottom edge of
the front panel. (This provides access to the printed circuit boards.)
REPLACE
Screw on cover of the L-shaped compartment housing.
Turn the chassis and front panel top side up.
Grasp the sides of the front panel and push the panel downward until it is perpendicular to the chassis.
Secure the front panel to the right and left sides of the chassis with six screws.
2-28

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