Viking lm-24s Service Manual

Telecommunication Peripheral Products

See at a Glance when Lines are Ringing

Technical Practice

or In-Use

LM-24S

Line Status Monitor

System

July 5, 2000

See at a Glance when

Lines are Ringing

or In-Use

LM-24M LM-24D

The LM-24S Line Status Monitor System is designed for professional and efficient call
processing at department answering positions, message centers and back-up
attendant stations. Each LM-24S Line Status Monitor System includes one LM-24D
Display and one LM-24M Scanner.

The LM-24S Line Status Monitor
System provides a visual status of up
to 24 lines or stations. If a line or
station is in use, the corresponding
LED will light steady, a ringing line or
station will show a flashing LED.

Even if a ringing phone is out of
hearing range, a common audible
tone calls the operator’s attention to
the visible display. The tone is
adjustable for convenient operation.

http://www.VikingElectronics.com

VIKING©

[e-mail]

Features Applications

• Non-volatile memory (no batteries required)

• Visual status for up to 24 analog lines or
stations (idle, in-use, ringing)

• Programmable ring indication on a per-line
basis

• Adjustable display viewing angle for desk or
wall mounting

• Displays require only a single pair of wires

• Powers up to (3) LM-24D or LM-12W displays

• User printable extension identification cards

• Adjustable audio volume

• Quick installation

• Includes both the display and the scanner

• One year limited warranty

• Ideal for areas where personal attention must be
given to every call

• Eliminates the additional cost of adding a PABX
console or key system

• Allows for full utilization of all call pickup
features

• Monitors the status of lines or stations

Sales...(715) 386 - 8861

Specifications

Power: 120V AC/13.8V AC 1.25A UL listed adapter provided
Dimensions: LM-24M - 187mm x 127mm x 45mm (7.37” x 5” x

1.75”), LM-24D - 184mm x 119mm x 38mm (7.25” x 4.7” x 1.5”)
Shipping Weight: LM-24M - .68 Kg (1.5 lbs), LM-24D - .59 Kg

(1.3 lbs)
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to 95% non­condensing humidity

Connections: (1) RJ21X connector, (1) RJ11 jack
Maximum Display Runs: (1) display: 244m (500 ft), (2) display:

122m (400 ft), (3) displays: 61m (200 ft)

Installation

LM-24M Scanner

1 2 3 4

Al A.

Joanne M.

Stacy R.

Rudy T.

Linda V.

VIKING

©

LM-24D
Display

Don S.

Karen W.

Tom S.

Marie W.

Rachel O.

Ken M

ike L.

Carol L.

Shelly B.

Dennis M.

Bill H.

Paul S.

Nichole S.

.

Greg Y.

Tim

R.

Red
Green

Yellow Black

Optional

Earth Ground

Connection

Paul M.

Gail M

.

Al H.

M

ick W

.

M

RESET

LINE STATUS MONITOR

COM

SCANNER

VIKING©

MODEL LM-24M

POWER DATA

SENS
ADJUST

VIKING ELECTRONICS, INC. HUDSON, WI 54016

RJ21X

EARTH

GND

120V AC

Earth

Ground

Loop or
ground start
C.O. lines or

analog

To extension

telephones

PABX/KSU

station ports

Typical Punch-Down Block

(not included)

A. Ground Connections

The earth grounding lug or yellow/black pair on the modular RJ14 jack of the LM-24M
scanner must be connected to the positive of the talk battery for proper reference.
Normally this is the earth ground on most C.O. lines or analog PABX/KSU stations. To
test, use a voltmeter with the positive probe connected to the earth ground and the
negative probe to the ring side of a phone line. Measurements should be about 50 volts
on-hook and 30 volts off-hook.

Lug

Stations

Line Pins Color

1T
1R

2T
2R

3T
3R

4T
4R

5T
5R

6T
6R

7T
7R

8T
8R

9T
9R

10T
10R

11T
11R

12T
12R

13T
13R

14T
14R

15T
15R

16T
16R

17T
17R

18T
18R

19T
19R

20T
20R

21T
21R

22T
22R

23T
23R

24T
24R

25T

25R

26

W/BL

1

BL/W

27

W/O

2

O/W

28

W/G

3

G/W

29

W/BN

4

BN/W

30

W/S

5

S/W

31

R/BL

6

BL/R

32

R/O

7

O/R

33

R/G

8

G/R

34

R/BN

9

BN/R

35

R/S

10

S/R

36

BK/BL

11

BL/BK

37

BK/O

12

O/BK

38

BK/G

13

G/BK

39

BK/BN

14

BN/BK

40

BK/S

15

S/BK

41

Y/BL

16

BL/Y

42

Y/O

17

O/Y

43

Y/GN

18

GN/Y

44

Y/BN

19

BN/Y

45

Y/S

20

S/Y

46

V/BL

21

BL/V

47

V/O

22

O/V

48

V/GN

23

GN/V

49

V/BN

24

BN/V

50

V/S

25

S/V

Receptionist’s Phone

B. Phone Line Connections

All connections to the RJ-21X are in parallel with the C.O. lines or analog PABX/KSU stations. Use the table (above
right) to make the connections to the RJ-21X connector on the LM-24M scanner.

Note: The LM-24M scanner is factory set to 48 volts for C.O. lines or analog PABX/KSU stations. The LM-24M is
not sensitive to the polarity of the C.O. lines connected to the RJ-21X.

C. Display Connections

Communication from the LM-24S scanner is accomplished over a single pair to the LM-24D display. The LM-24D
display receives data through pins 3 (red) and 4 (green) of a modular 6-wire jack or pins 2 (red) and 3 (green) of a
modular 4-wire jack.

Note: The LM-24D is sensitive to the polarity of this communication pair. The LM-24D will not be damaged by
reversed polarity on this pair but it will not function properly!

D. Multiple Displays

The LM-24M can power up to (3) displays. If you need to power more than (3) displays or for long runs between the
scanner and display, an optional PS-2 power supply must be used with each LM-24D display. Adding PS-2 power
supplies will efficiently double maximum run distances.