Quantcast Figure FO-16. MAC Control Fault Isolation Flow Chart 5865-01-076-9050">

 

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Figure FO-15. Self-Test Fault Isolation Flow Chart
Up
TM-11-5865-215-13 Receiver Control C-10026/USQ NSN
Next
Figure FO-17. Clarifier Control Fault Isolation Flow Chart
TM 11-5865-215-13
WITH OSCILLOSCOPE, CHECK FOR
PULSE ACTIVITY AT A3-106
REPLACE
CCA Al
AND AT A3-107
I
1. CONNECT CHANNEL D OF A 4-TRACE OSCILLOSCOPE TO A3-106 (0671). THE NEGATIVE GATE ON CHANNEL D
IS THE TEST INTERVAL (REFER TO FIGURE A). INTERNALLY SYNC THE OSCILLOSCOPE WITH THE NEGATIVE
EDGE OF THIS INPUT. EXPAND THE OSCILLOSCOPE SWEEP SO THAT THE NEGATIVE GATE FILLS THE ENTIRE
WIDTH OF THE CHANNEL D TRACE.
2. CONNECT THE OSCILLOSCOPE CHANNEL C TO A3-102
3. ROTATE THE RECEIVER CONTROL MGC CONTROL FULL CCW.
DURING THE TEST INTERVAL (DETERMINED
4. OBSERVE CHANNEL C TRACE IS HIGH
CHANNEL D).
5. SLOWLY ROTATE MGC CONTROL CW, OBSERVING 16
HIGH-TO-LOW EXCURSIONS OF CHANNEL C. WHEN THE
I
MGC CONTROL IS FULL CW CHANNEL C IS LOW
CHANNEL A
I
OV).
6. CHANGE THE OSCILLOSCOPE CHANNEL D LEAD TO
I
I
A3-107 (0672).
7. CONNECT CHANNEL B OSCILLOSCOPE LEAD TO
CHANNEL B
I
I
A3-101 (1621), AND CHANNEL 4 OSCILLOSCOPE LEAD
I
REMOVE AND
TO A3-1OO (1622).
REPLACE CCAS
8. ROTATE MGC CONTROL FULL CCW. OBSERVE CHANNEL
Al AND A5
i
1
A, B, AND C TRACES ARE ALL HIGH DURING THE TEST
CHANNEL C
INTERVAL (DETERMINED BY CHANNEL D).
9. SLOWLY ROTATE THE MGC CONTROL CW. OBSERVE THE
q
FOLLOWING NUMBER OF HIGH-TO-LOW EXCURSIONS ON
-
--
THE OSCILLOSCOPE DURING THE TEST INTERVAL.
CHANNEL D
!
1. WITH A VOLTMETER CONNECTED
OSCILLOSCOPE TRACE
NO. OF EXCURSIONS
AND
BETWEEN CCA A3-69
(-), ROTATE THE MGC CON-
A3
CHANNEL C
8
FIGURE A
TROL FROM FULL CCWTO FULLCW.
CHANNEL B
4
2. OBSERVE VOLTAGE MOVES FROM
CHANNEL A
2
TO OV
10.
WHEN THE MGC CONTROL IS FULL CW, ALL
BE LOW.
(1623).
11.
CHANGE THE CHANNEL A PROBE TO
12.
ROTATE MGC FULL CCW. OBSERVE THAT THE CHANNEL A TRACE IS HIGH.
OBSERVING THAT CHANNEL A CHANGES FROM HIGH TO LOW AS THE MGC
13.
ROTATE MGC CONTROL
AS MGC IS ROTATED
CONTROL GOES THRU ITS MIDPOINT POSITION. THE CHANNEL A TRACE REMAINS
FULLY CW.
REPLACE
MGC CONTROL
YES
f
REMOVE AND
REPLACE CCA A3
EL3RJ061
Control Fault
Isolation Flow

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