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REMOVING AND REPLACING CONNECTORS AND CHASSIS COMPONENTS (Cont)
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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REGULATED VOLTAGE ADJUSTMENT
TM 11-5805-387-34-2
Section IV. ADJUSTMENT PROCEDURES
2-13. GENERAL INSTRUCTIONS
Make adjustments after performing maintenance.  These tests determine if the modem has been
properly repaired and can be returned to use. Adjustments are necessary after replacing modules A1,
A2, A5, and board A9. The chart below lists the specific adjustments for each.
ASSEMBLY REPLACED
ADJUSTMENT PROCEDURE
PARAGRAPH
Receive audio module Al
Regulated voltage adjustment;
BFO frequency limits adjustment
Scope module A2
Centering;
Alignment
Loop battery module A5
Loop current adjustment
Preregulator board A9
Regulated voltage adjustment
 Tools and test equipment: See paragraph 2-2.
 Bench test setup: See paragraph 2-4 for test equipment setup.
 Modem settings: Before starting each adjustment procedure, preset the modem's front panel controls and
switches this way:
CONTROL OR SWITCH
SETTING
AUTO MARK HOLD
OFF
RECEIVE
NORM
DC LOOP NO. 1
60
DC LOOP NO. 2
60
SQUELCH SENS
MIDRANGE
SCOPE INTENSITY
MIDRANGE
METER FUNCTION
REGULATED DC
MODE SELECTOR
850 HZ
RCV/SEND
SEND
BFO
MIDRANGE
ONE WAY/DUPLEX
DUPLEX
AUDIO GAIN
MIDRANGE
ON/OFF
OFF
Internal switches:
 Set A3S1 NORM/REV switch to NORM.
 Set A5S1 INT-EXT switch to LOOP 1 and 2-INT.
2-33

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