Quantcast LOSS OF DC LOOP CURRENT REGULATION

 

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20-MA LOOP CURRENT, BUT NO 60- MA LOOP CURRENT.
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
Next
ABNORMAL SCOPE PRESENTATION BUT NORMAL DISCRIMINATOR INDICATION ON TEST METER.
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(14) LOSS OF DC LOOP CURRENT
Defective: Loop battery module A5.
REGULATION.
1. With TS-799A/UGM-1 and test cable
+8.0 vdc
Go to 2.
Replace
No. 3 connected (para 2-4),
defective
connect ME-26B/U across RECEIVE
module A5
PULSE of loop battery module A5.
2. Connect ME-26B/U across SEND PULSE of
+0.6 vdc
------------
Replace
loop battery module A5.
defective
module A5
(15) ABNORMAL SCOPE PRESENTATION
Defective: Scope module A2. Receiver module
BUT NORMAL DISCRIMINATOR
A4. Resistor R3.
INDICATION ON TEST METER.
1.Connect the TS-799AIUGM-1 with the
Replace
MESSAGE TRANSMIT switch set to ON
defective
(para 2-4). Connect test cable No. 3
module A2
(para 2-4) and set the modem ONE
WAY/DUPLEX switch to DUPLEX. Set the
MODE SELECTOR switch to 850 HZ and
observe the modem CRT.
2. Set the MODE SELECTOR switch to 85 HZ
Replace
and observe the modem CRT.
defective
module A2
2-21

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