Quantcast METER FUNCTION SWITCH AT REGULATED DC: LOW OR HIGH READING ON TEST METER

 

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NO + 20 VOLTS DC METER INDICATION
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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MODEM NOT TRANSMITTING EITHER VOICE OR TTY.
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(4) METER FUNCTION SWITCH AT
Defective: Circuit board A9, Series regulator
REGULATED DC: LOW OR HIGH
Transistors Q1, Q2, Q3
READING ON TEST METER
NOTE
Series regulators Q1, Q2, Q3 automatically cut off when the +22 volt dc output of preregulator
board A9 is shorted. Normal operation will resume when short is removed.
1. Connect ME-26BIU across junction of L1
+22 vdc
Go to 2.
Replace
and C22; measure voltage.
1.0
defective
board A9
2. Connect ME-26B/U between terminals (E35
+1 to 5 vdc
----------
Go to 3.
and E37) of resistor R8; measure voltage.
3. If voltage less than 1 vdc, check series
Short
Replace
Go to 4.
regulator transistors Q1, Q2, Q3 for shorts.
defective
transistor
4. If voltage greater than 5 vdc, check series
Open
Replace
----------------
regulator transistors Q1, Q2, Q3 for open
defective
condition.
transistor
2-12

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