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D
1
SYSTEM INDICATED FAILURE
PAGE
2 OF
4
t
-Switch
pow~r
OFF
~
then to ON
~.
Does the SUBSYSTEM READY indicator
in the operator Information area?
Y N
come on
011
If this display does NOT
us~
a
Switch
Control Unit, take the N path now.
-Disconnect the Switch Control Unit and
connect the coaxial cable directly to
th~
display.
-Switch power OFF
~
then to ON
~.
DoeS the SUBSYSTEM READY indicator come
on in the Operator Information area?
Y N
3 3
012
(The following is a test of the
coaxial cable from the terminal to the
Control Unit.
Control Unit signals
will not affect test.)
-Switch
pow~r
OFF
~.
-Disconnect the coaxial cable from the
terminal.
-Measure the resistance from the
center pin of the connector on the
cable to the outer case of the
connector.
-Use RxlO range.
Is resistance between 1.Sk ohms and
2.6k
ohms?
Y N
013
Resistance higher than 2.6k ohms
indicates an open cable, bad cable
connector or failure at the Control
Unit.
(Cable resistance is 30
ohms/IOOO feet).
-Repair or exchange - See Control
Unit MIM.
GO TO MAP
0000,
ENTRY POINT
BB.
014
(The following is a test from the
coaxial connector on the terminal
connector to card C2).
-Test the resistance from the center
contact of the connector on the
terminal to the outer case of the
connector.
Do not use the frame of
the terminal.
-Use
Rxl
range.
Does resistance measure between 0 and
3
ohms?
Y N
015
eReseat the C2 logic card.
-Verify the continuity, location and
seating of the coaxial cable
(conductor and shield) from the
coaxial cable socket to the logic
gate.
See Figure 6-13.
Repair or
excha'nge the cable as necessary.
-If no problem is found exchange the
C2 card.
GO TO MAP
0000,
ENTRY POINT
BB.
E F G
G
MAP
0900-2
L
-Disconnect logic card C2.
Repeat the
last test (step 014).
Does the meter show an open circuit?
Y N
017
The internal wlrlng from the logic gate
to the external coaxial deviee cable
connector is failing.
-Repair or exchange it.
GO TO MAP
0000,
ENTRY POINT
BB.
OlS
-Exchange C2 card.
Is the problem still present?
Y N
I
g~9TO
MAP
0000,
ENTRY POINT
020
BB.
-Exchange logic cards D2 then 82.
Is the problem still present?
I
~~lTO
MAP
0000,
ENTRY POINT
BB.
022
(ENTRY POINT DOl
Was the terminal LOGGED OFF because of
errors?
(s~e
ERROR lOG codes, MIM section
2.6.6,
for log off codes)
Y N
023
Switch power OFF 101.
Does this terminal contain feature
cards?
Y N
024
-Inspect the coaxial cable ground, the
internal coaxial cable and the logic
board strips for failures.
GO TO MAP
0000,
ENTRY POINT
BB.
025
-Remove the feature cards one at a time
and test each time.
-Exchange the card removed when the
problem goes away.
GO TO MAP
0000,
ENTRY POINT
BB.
026
(ENTRY POINT CCI
Is there an error code 77 or 204 ?
Y N
3
H
027
IS the error code associated with a
feature or the convergence logic card
(821?
(Se~
MIM section
2.6.6
for codes).
Y N
3
K
04FEB81
MAP
0900-2
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