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TROUBLESHOOTING CHART (Cont)
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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TROUBLESHOOTING CHART (Cont)
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(6) MODEM NOT TRANSMITTING EITHER
Defective: Circuit board A6. RCV-SEND switch
VOICE OR TTY
S5. Connector J2.
Do all continuity and resistance checks with all power removed.
1. Connect ME-26B/U between terminals 2
50 ohms 20
Go to 2.
Replace
and 13 on board A6; measure resistance.
defective
board A6
2. Connect ME-26B/U between terminals 14
50 ohms 20
Go to 3.
Replace
and 15 on board A6; measure resistance.
defective
board A6
3. Check continuity of RCV/SEND switch
Continuity
Go to 4.
Replace
(fig. FO-8).
defective
switch S5
4. Connect ME-26B/U between terminal J on
Continuity
Go to 5.
Replace
connector J2 and terminal 14 on board A6;
defective
check for continuity.
connector J2
5. Connect ME-26B/U between terminal D on
Continuity
------------
Replace
connector J2 and terminal 15 on board A6;
defective
check for continuity.
connector J2
3-9

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