NO + 20 VOLTS DC METER INDICATION

TM 11-5805-387-34-2

MALFUNCTION/SYMPTOM

PROBABLE CAUSE

TEST PROCEDURE

INDICATION

YES

(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.

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