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REMOVING AND REPLACING PRINTED CIRCUIT BOARDS A6, A7, A8, A9
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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REMOVING AND REPLACING CONNECTORS AND CHASSIS COMPONENTS (Cont)
TM 11-5805-387-34-2
2-12. REMOVING AND REPLACING CONNECTORS AND CHASSIS COMPONENTS
 To gain access to chassis components, remove modem from chassis.
 Stand modem on end for access to top and bottom of chassis.
CONNECTORS J1, J2, J3, J4
REMOVE
 Remove printed circuit board A6 from compartment housing (para 2-10).
 Remove hex nut (connectors J1, J2) or spanner nut (J3, J4) holding connector to front panel.
 Carefully push connector out from inside the panel.
 Connectors J3, J4: Tag, unsolder, and remove wires from connector.
 Remove connector.
 Connectors J1, J2: Unscrew rubber bushing retainer ring. Push the bushing back against wires, away
from connector, to expose solder terminals. Tag, unsolder, and remove wires from connector; remove
connector.
REPLACE
 Solder wires to new connector.
 Connectors J1 and J2: Replace screws on rubber bushing retainer ring.
 Carefully push connector into front panel.
 Replace hex nut (J1, J2) or spanner nut (J3, J4).
 Replace printed circuit board A6 (para 2-10).
CONNECTORS J5, J6, J7, J8
REMOVE
 Remove printed circuit board A8 from compartment housing (para 2-10).
 Remove hex nut or spanner nut (J8) holding connector to front panel.
 Carefully push connector out from inside of panel.
 Unscrew rubber bushing retainer ring. Push the bushing back against wires, away from connector, to
expose solder terminals.
 Tag, unsolder, and remove wires from connector; remove connector.
REPLACE
 Solder wires to new connector.
 Replace screws on rubber bushing retainer ring.
 Carefully push connector into front panel.
 Replace nut.
 Replace printed circuit board A8 (para 2-10).
MODEM SWITCHES
The procedures in this section are for these switches:
S1 ONE WAY/DUPLEX
S6 AUTO MARX HOLD
S2 RECEIVE
S7 DC LOOP NO.1REMOVE
S3 METER FUNCTION
S8 DC LOOP NO.2
S4 MODE SELECTOR
S5 RCV/SEND
REMOVE
 Tag, unsolder, and remove all wires connected to switch terminals.
 On front panel remove control knob retainer screw or hex nut.
 On inside of front panel remove any hex nuts.
 Remove switch.
2-30

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