Quantcast 20-MA LOOP CURRENT, BUT NO 60- MA LOOP CURRENT.

 

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TUNING MALFUNCTION IN 850 HZ MODE
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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LOSS OF DC LOOP CURRENT REGULATION
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(13) 20-MA LOOP CURRENT, BUT NO 60-
Defective: Dc loop no. 1 switch S7. Dc loop no 2
MA LOOP CURRENT.
Switch S8. Loop battery module A5.
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
Go to 3.
Replace
(fig. FO-8).
defective
switch S8
3. With TS-799A/UGM-1 and test cable
+8.0 vdc
Go to 4.
Replace
No. 3 connected (para 2-4),
defective
connect ME-26B/U across RECEIVE
module A5
PULSE of loop battery module A5.
4. Connect ME-26BIU across SEND PULSE of
+0.6 vdc
-----------
Replace
loop battery module A5.
defective
module A5
2-20

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