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NO TEST METER OR SCOPE READINGS FOR ANY POSITION OF METER FUNCTION SWITCH. (Cont)
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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METER FUNCTION SWITCH AT REGULATED DC: LOW OR HIGH READING ON TEST METER
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(3) NO + 20 VOLTS DC METER INDICATION
Defective: METER M1. Circuit board A7. Meter function
switch S3.
1. Drop front panel down (para 2-9);
+20 vdc
Replace
Go to 2.
connect ME-26B/U between meter M1
defective
posts.
2. Set METER FUNCTION switch to RCV
+20 vdc
Go to 3.
Replace
LEVEL. Remove cover of circuit board A7
defective
by removing three screws and three washers.
board A7
Connect ME-26B/U between terminal 3 and
terminal 7 of board A7.
Do all continuity and resistance checks with all power removed.
3. Check continuity of METER FUNCTION
Continuity
Go to 4.
Replace
switch (fig. FO-8).
defective
switch S3
4. Connect ME-26B/U across pin 13 of XA1;
+22 vdc
----------------
Replace
measure voltage.
defective
wiring.
2-11

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