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TEST EQUIPMENT
Up
TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
Next
TROUBLESHOOTING CHART
TM 11-5805-387-34-2
TEST CONDITIONS
Turn on the test equipment and allow a 5-minute warmup period.
When checking all transmit modes except VOICE, set the MODE SELECTOR switch to the desired mode of
operation, and set the TS-799AIUGM-1 controls as follows:
POWER - 115 V ON
RATE - 7.5 BAUDS
DISTORT SELECT - OFF
CURRENT SELECT - 60
MESSAGE TRANSMIT - ON
MESSAGE SELECT - DOT/CY (sets up equipment to produce an output of
alternate marks and spaces)
MESSAGE SELECT - SELECTED PULSES (sets up equipment to produce a
continuous selected character as determined by the position of the MARK -
SPACE toggle switches)
NOTE
With the AUTO MARK HOLD switch in the OFF position use the same procedures to check the
receiving modes; the transmit operation controls both transmitter output and receiver input
through test cable No. 3. Warm up the BFO oven for 5 minutes before performing tests or
adjustments in the 850-Hz mode.  After the warmup period, adjust the BFO control for a
symmetrical Lissajous pattern (when keying).
2-5. TROUBLESHOOTING SYMPTOM INDEX
Use this Index to quickly find procedures in the troubleshooting chart.
TROUBLESHOOTING SYMPTOM
PROCEDURE NO.
PAGE
MODEM
Does not transmit tty
6
Does not transmit voice
7
Does not transmit voice or tty
5
Incorrect scope display
15
(all M1 Indications except DISCRIMINATOR)
ON/OFF switch continues to trip
1
Receive tty malfunction
10
Tuning malfunction (MODE SELECTOR switch at 850 Hz)
12
MODEM TEST METER
Low or high REGULATED DC reading
4
No DC LOOP current regulation
14
No DISCRIMINATOR reading (RCV LEVEL reading and
9
abnormal scope display)
No RCV LEVEL reading (receive channel malfunctioning)
8
No reading
2
No receive DC LOOP current in mark-hold position
11
No 60 MA LOOP current (with 20 MA LOOP current)
13
No +20 volt dc reading
3
2-7

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