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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 CHASSIS COMPONENTS
TM 11-5805-387-34-2
MODEM SWITCHES
S1 ONE WAY/DUPLEX
S2 RECEIVE
S3 METER FUNCTION
S4 MODE SELECTOR
S5 RCV/SEND
S6 AUTO MARK HOLD
S7 DC LOOP NO. 1
S8 DC LOOP NO. 2
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.
Carefully push switch out from outside of panel.
REPLACE
CAUTION
Wafer switch terminals are easily bent and broken. When Installing a new switch containing
wafers, carefully position wiring harness to prevent strain on switch terminals.
Place new switch Into position.
On Inside of front panel replace any hex nuts.
On front panel replace control knob retainer screw or hex nut.
Solder wires to new switch terminals.
CIRCUIT BREAKER CB1
REMOVE
 Tag, unsolder, and remove wires from circuit breaker terminals.
 Remove hex nut on front panel ON/OFF switch.
 Remove circuit breaker.
REPLACE
 Place new circuit breaker into position.
 Tighten hex nut on front panel.
 Solder wires to circuit breaker terminals.
DIODES CR1-CR6
REMOVE
Tag, unsolder, and remove leads from diode.
Remove diode.
REPLACE
 Position new diode.
 Solder leads to new diode.
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