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Page Title:
Figure FO-15. Self-Test Fault Isolation Flow Chart |
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 11-5865-215-13
OBSERVE ONLY
1. CHECK THAT KEY ASSY LAMP
YES
THE TUNING
WITH A MU LTIMETER (POWER
DISPLAY DIGITS
OFF).
I
1. TURN RECEIVER CONTROL LAMP
CCA A5
2. IF THE LAMP IS GOOD,
(MHZ) DISPLAY
INTENSITY CONTROL FULL CW.
REPLACE CCA A2
2. MEASURE VOLTAGE BETWEEN
YES
AND A7
(-) WITH
MU LTIMETER.
VDC
3. OBSERVE VOLTAGE OF +5
WITH OSCILLOSCOPE,
REPLACE CHASSIS
CHECK LOW PULSE
WITH LOGIC PROBE
MOUNTED
ACTIVITY AT CCA A5
REGULATOR
CHECK FOR A LOW
PULSE AT A5-44
AND
PINS 45
46
1. MEASURE VOLTAGE
WITH LOGIC PROBE
AND
CHECK LOW PULSE
REMOVE
YES
REMOVE & REPLACE
A7-79.
ACTIVITY AT
REPLACE
CCA Al & CCA A7
2. VOLTAGE SHOULD MEASURE
HIGH PULSE ACTIVITY
CCA
YES
AT A5-38
CCA A5
I
I
REPLACE LAMP
REMOVE
E
NO
INTENSITY
REPLACE
CONTROL
CCA A5
YES
REMOVE & REPLACE
CCA A7
REMOVE &
TABLE A. COLUMN SELECT 1/0 BIT PATTERNS
REPLACE
1. REFER TO THE SELF-TEST MODE
CCA
CORRECT PATTERN FOR SEQUENCE GROUP
SHEET 1).
CHECK (FIGURE
(READ VERTICALLY)
2. RECORD STEP LETTER THAT
CORRESPONDS TO GROUP OF KEY
SEQUENCE GROUP
LAMPS WHICH DO NOT LIGHT.
SHEET
e
(SEE
f
g
h
i
3. REFER TO TABLE A. USING THE
,
COLUMN STROBE (NEGATIVE) SIGNAL
1/00
AS A CLOCK, CHECK THE
H
L
L
PIN 15)
H
L
H
L
H
L
H
L
BUS BITS WITH LOGIC PROBE FOR
PRESENCE OF CORRECT PATTERN.
1
L
H
H
L
L
H
H
L
L
H
L
PIN 16)
I
T
2
REMOVE &
PIN 17)
L
"L
H
H
H
H
L
L
L
H
L
REPLACE
CCA A2
3
L
L
L
L
L
L
L
H
H
H
H
PIN 18)
EL3RJ060
Self-Test Fault
Isolation Flow Chart
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