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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
4. Connect ME-26B/U between terminals 2
120 to 140 vdc
Go to 5.
Replace
and 3 on board A8. Measure voltage.
defective
board A8
5. Connect ME-26B/U between terminals 4
120 to 140 vdc
Go to 6.
Replace
and 5 on board A8. Measure voltage.
defective
board A8
6. Connect ME-26B/U between terminals 10
120 to 140 vdc
------------
Replace
and 11 on board A8. Measure voltage.
defective
board A8
(15) 20-MA LOOP CURRENT, BUT NO 60-
Defective: Dc loop no. 1 switch S7. Dc loop no.
MA LOOP CURRENT.
2 switch S8.
Do all continuity and resistance checks with all power removed.
1. Check continuity of DC LOOP NO. 1 switch
Continuity
Go to 2.
Replace
(fig. FO-8).
defective
switch S7
2. Check continuity of DC LOOP NO. 2 switch
Continuity
------------
Replace
(fig. FO-8).
defective
switch S8
3-16

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