Section I. GENERAL INFORMATION
This manual describes direct and general support maintenance for Modem Radio Teletypewriter MD-522A/GRC. It
includes instructions for troubleshooting, repairing, and testing the equipment. It also lists all the tools, test equipment,
and materials needed for maintenance.
The modem and its major electronic components are described in section II of this chapter. Operating instructions are
covered in TM 11-5805-387-10-2; organizational maintenance is covered in TM 11-5805-387-20-2.
In this manual, Modem Radio Teletypewriter MD-522A/GRC is referred to as modem.
1-2. CONSOLIDATED INDEX OF ARMY PUBLICATIONS AND BLANK FORMS
Refer to the latest issue of DA Pam 310-1 to determine whether there are new editions, changes or additional
publications pertaining to the equipment.
1-3. MAINTENANCE FORMS, RECORDS, AND REPORTS
a. Reports of Maintenance and Unsatisfactory Equipment
Department of the Army forms and procedures used for equipment will be those prescribed by DA PAM 738-750 as
contained in Maintenance Management Update.
b. Report of Packaging and Hand ling Deficiencies
Fill out and forward SF 364 (Report of Discrepancy (ROD)) as prescribed in AR 735-11-2/DLAR
4140.55/NAVMATINST 4355.73A/AFR 400.54/MCO 4430.3F.
c. Discrepancy in Shipment Report (DISREP) (SF 361)
Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in AR 55-38/NAVSUPINST
4610.33C/AFR 75.18/MCO P4610.19D/DLAR 4500.15.
1-4. DESTRUCTION OF ARMY ELECTRONICS MATERIEL
Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.
1-5. ADMINISTRATIVE STORAGE
Administrative Storage of Equipment issued to and used by Army activities will have preventive maintenance
performed in accordance with the PMCS charts before storing. When removing the equipment from administrative
storage the PMCS should be performed to assure operational readiness. Disassembly and repacking of equipment for
shipment or limited storage are covered in TM 740-90-1, Administrative Storage of Equipment.
1-6. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
If your modem needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what
you don't like about your equipment. Let us know why you don't like the design. Tell us why a procedure is hard to
perform. Put it on an SF 368 (Quality Deficiency Report). Mail it to us at: Commander, US Army Communications-
Electronics Command and Fort Monmouth, ATTN: DRSEL-ME-MP, Fort Monmouth, New Jersey 07703. We'll send you
1-7. TECHNICAL CHARACTERISTICS
See TM 11-5805-387-10-2.