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Section III. MAINTENANCE PROCEDURES (Cont)
Up
TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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ADJUSTMENT PROCEDURES
TM 11-5805-387-34-2
VARIABLE RESISTORS
R1 AUDIO GAIN
R2 BFO
R3 SCOPE INTENSITY
R9 SQUELCH SENS
REMOVE
Tag, unsolder and remove leads from resistor.
Remove control knob retainer screws.
Remove resistor.
REPLACE
Put new resistor in place.
Replace control knob retainer screws.
Solder leads to new resistor.
METER M1
CAUTION
Do not press on meter glass.
REMOVE
Tag and unsolder wire leads to meter terminals.
Remove four front panel screws.
Remove meter.
REPLACE
Install new meter.
Replace four front panel screws.
Solder wires to meter.
3-9. REMOVING AND REPLACING CHASSIS COMPONENTS
To gain access to chassis components, remove modem from chassis (para 2-8).
Stand modem on end for simultaneous access to top and bottom of chassis.
FILTERS FL1, FL2, FL3, FL4, FL5
REMOVE
On the bottom side of the chassis remove four hex nuts holding filter to chassis.
Tag, unsolder and remove leads from terminals.
Lift out filter.
REPLACE
Place new filter into position.
Tighten four hex nuts.
Solder leads to filter terminals.
3-24

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