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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
(11) NO RCV LEVEL READING ON METER
Defective: Meter function switch S3. Circuit
M1. RECEIVE CHANNEL
board A7.
FUNCTIONING.
Do all continuity and resistance checks with all power removed.
1. Check continuity of METER FUNCTION
Continuity
Go to 2.
Replace
switch (fig. FO-8).
defective
switch S3
2. Remove cover of circuit board A7 by
+20 vdc
Continue test.
Continue test.
removing three screws and three washers.
0.2
Connect ME-26B/U across terminal 3 of
board A7; measure voltage.
Connect ME-26B/U across terminal 7 of
0.06 vdc
----- --
Replace
board A7; measure voltage.
defective
board A7
(12) RCV LEVEL READING ON TEST
Defective: Circuit board A7. Relay K1. Filter
METER, NO DISCRIMINATOR
FL6. Filter FL7.
READING. ABNORMAL SCOPE
DISPLAY.
1. Remove cover of circuit board A7 by
+20 vdc
Continue test. Continue test.
removing three screws and three washers.
0.2
Connect ME-26B/U across terminal 3 of
board A7; measure voltage.
Connect ME-26B/U across terminal 7 of
0.06 vdc or
Go to 2.
Replace
board A7; measure voltage.
nominal
defective
voltage
board A7
3-13

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