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4) For the
MDF-to-EKT
cable,
a more
precise
check IS made using an ohmmeter.
TABLE
B
STATION
CABLE
CONTINUITY
CHECK
USING
VOLTMETER
FROM
TO
VOLTAGE*
Pair
Wire
COb
Pair
Wwe
CC&Or
1
T
Green
2
T
Black
24
1
R
Red
2
T
Black
24
1
T
Grl??i-
2
R
Yellow
24
1
R
Red
2
R
Yellov:
24
1
T
Green
1
.R
Red
0
2
T
Red
2
R
Yellow
0
3
T
While
3
R
Blue
0
3
T
Whffe
1
R
Red
0
3
3
Blue
1
R
Red
0
3
T
Wh!lE
1
T
Green
0
3
R
Blue
1
T
Green
0
3
T
Whsre
2
T
Black
0
,3
R
Blue
2
T
Black
0
3
T
Whlre
2
A
Yellow
0
3
R
Blue
2
R
Yellow
0
*Nominal
voltage-
within
the power
supply
limits
of ~23.2 - 28.2
VDC while
under AC
power.
07.10
Ohmmeter
Test
07.11
The continuity
of the cable run between
the HKSU and the EKT is checked
with
an ohm-
meter as follows:
1) Disconnect
the EKT.
2) At t!-je L'IDF, remove
the bridging
clips.
3j Using
an ohmmeter,
measure
the resistance
between
all combinations
of the four wires
at
- the modular
block. All measurements
should
exceed
1 M ohm.
4) At the MDF, place shorting
jumper
wires
be-
tween
the T and R of pair #l (green-red),
the T
and R of pair #2 (black-yellow),
and the T and R of
pair #3 (blue-white).
5) At the modular
block, measure
the resistance
between
all wire
combinations.
The
proper
readings
are shown
in Table C.
FAULT FINDING
SECTION 500-036-500
JANUARY 1988
TABLE
C
STATION
CABLE
CONTINUITY
CHECK
USING
OHMMETER
-__
FROM
TO
RESISTANCE
Pair
Wwe
Color
Pan
Wire
Color
:
1
T
Green
2
T
Black
1 iJ\ 5?C-
,l
R
Red
2
T
Blacb
1 r: CA-,7
1
T
Green
2
R
: Yellow
1 M OFF?
1
R
Red
2
R
Yellow
1 v 07r-
1
T
Green
1
R
Red
55?A Ohr-5'
2
T
Black
2
R
Yellow
55M 0Pr-x
3
T
Where
3
R
Blue
55 mns'
3
T
White
1
R
Red
lMo-rr
3
R
Blue
1
R
Red
: m 0>7-
?
T
wri11e
1
T
Green
1M onr-
3
R
Blue
1
T
Green
i M OCR-
3
T
White
2
T
Black
1 M o'ln
3
a
Blue
2
T
Black
1M on?-
3
T
WhNe
2
R
Yellow
i rs O-T
'NOTE.
The green-red
and
black- yellow
measure-
ments should be within
10% of each other.
-3-
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