Valcom v-9940 Service Manual

Issue 5

V-9940

EXPANDABLE STATION LEVEL PAGE ADAPTER

INTRODUCTION

The V-9940 is an Expandable Station Level Page
Adapter designed to provide ring trip and page
access circuitry for use on standard device telephone
lines. These instructions contain the specifications
and information necessary to install, operate and
maintain the V-9940 Expandable Station Level Page
Adapter.

IMPORTANT: Please review dip switch
settings (page 3) for equipment suitability.

FCC Information

When installing the V-9940, contact the local
Telephone Company and give them the following
information:

• The telephone number of the line to which the

V-9940 will connect;

• The FCC Registration #: BAF9I7-13957-OT-N;

• The ringer equivalence number: 1.1A

If the V-9940 is disconnected from its present line,
contact the local Telephone Company to make them
aware of the change.

Telephone Company Procedures: the goal of the
telephone company is to provide the best service
possible. In order to do this, it may occasionally be
necessary for them to make changes in their
equipment, operations or procedures. If these
changes potentially affect the service or the operation
of customer equipment, the Telephone Company will
give written notice to allow any changes necessary to
maintain uninterrupted service.

SPECIFICATIONS

Access Methods

• Centrex numbers

• Loop start and ground start central office lines

• PABX station numbers

Figure 1 depicts a block diagram of a typical PABX
installation.

Features

• Ring trip on first ring

• 600 Ohms output; 8 Ohms output with AGC

• Multiple units may be used for multi-zone

paging with all call behind a PABX

• Use with Valcom multi-zone page control unit

for multi-zone paging Centrex or C. O. lines
(DTMF signaling only)

• Use with Valcom handsfree page units for

talkback paging

• Background music input

• Open loop detect reset

• Audio sensing circuit for reset

• Time out reset

• Manual reset

• Answer verification tone

• All call override tone

• Battery reversal indicator

• Auxiliary Make/Break contact

• Built in 66 type connection block

• Complies with UL 145

1 947740

ZONE 1 IN

ZONE 2 IN

ALL CALL IN

NOTE:

When used with a PABX, the PABX must not
return any tones to the called party after calling
party disconnect on a station to station call.

T

ALL CALL IN

IN

8 OHM OUT

R

ALL CALL AUDIO

T

ALL CALL IN

IN

8 OHM OUT

R

ALL CALL AUDIO

T

ALL CALL OUT

IN

8 OHM OUT

R

BLOCK DIAGRAM OF A TYPICAL PABX INSTALLATION

FIGURE 1

VALCOM ONE-WAY
AMPLIFIED SPEAKER
ASSEMBLIES

Capacity

• Each V-9940 provides one zone of paging

(when connected to its own PABX station
number).

• Use a V-9940 and a station number per zone for

multi-zone paging behind a PABX.

• An additional station number and V-9940 may

be used to provide all call or override in a
one-way multi-zone system behind a PABX.

• One V-9940 may be used with a Valcom

multi-zone page unit to provide up to 36 zones
of paging on Centrex or central office lines
(DTMF signaling only).

Dimensions/Weight

• 8.20" H x 4.55" W x 2.30" D
(20.83cm x 11.56cm x 5.84cm)

• 1.7 lbs. (0.77 kg)

Power Requirements

-21.5 to -26VDC "B" Battery, 200mA maximum
(recommend Valcom’s VP-624B Class 2 power
source).

Environment

Temperature: 0 to +50°C
Humidity: 0 to 85% (non-precipitating)

Specifications

Tip and Ring Input: 600 Ohms
Voltage for Ring Trip: 75-105VAC
(20 or 30Hz)

Ring Trip Timing: 150ms
Open Loop Detect: 150ms starting 1
second after ring trip
Audio Sense Release: 4, 8, 16, 32 or 64
seconds after audio drops below -22dBm
Time Out Release: 1, 4, 8, 16, 32 or 64 seconds
Manual Reset: 25ms ground
Output 1:
Impedance: 600 Ohms
Page Level Output Level: Input Level -1dB
Music Level Output Level: Input Level
Output 2:
Impedance: 8 Ohms
Page Level: -10dBm
Music Level: -17dBm
Music Source: 8 to 600 Ohms

-10 to -18dBm
Answer Verification Tone: 500Hz: 250ms On;
250ms Off
Form C Contacts: 30VDC, 2.0 Amps or
125VAC, 1.0 Amp

DESIGN

General

The Valcom V-9940 Expandable Station Level Page
Adapter is designed to provide access to paging from
a standard PABX station number, a Centrex number
or a Central Office line. It should not be used on
coin service lines or party lines. The V-9940 may be
directly connected to Valcom One-Way Amplified
speaker assemblies or may be used in conjunction
with Valcom one zone or multi-zone page adapters.
The following sections describe possible
arrangements and detail the equipment required.

When One-Way Amplified Speaker Assemblies are
specified, consult the Valcom catalog for the style
desired. Once the style and quantity of speakers are
determined, select the appropriate power supply after
referring to the Valcom One-Way Paging VSP or the
Marketing Guide.

PABX Station Level Paging
NOTE: Before proposing Station Level Paging,

perform the following test:

1. Dial between two stations on the PABX and
answer the call.

2. Have the called party keep listening while the
calling party hangs up.

3. After calling party release, what does the called
party hear?

2

If the PABX IMMEDIATELY returns any type of
tones to the called party (dial tone, reorder tone, etc.)
then STATION LEVEL PAGING CAN NOT BE
USED. Consult the Valcom catalog for an
appropriate trunk level page adapter. If there is
silence of at least 10 SECONDS before any tones are
returned, then one-way paging may be used. If the
line REMAINS SILENT for at least 1 and 1/2
minutes after disconnect, then one-way or talkback
paging may be used.

If the type of paging desired is possible on a station
level of the PABX, continue in this section to
determine equipment required.

• One Zone of One-Way Paging:

This arrangement requires one PABX station
number, one V-9940 page adapter, appropriate
Valcom One-Way Amplified Speaker Assemblies
and a -24VDC power supply.

• Multi-Zone One-Way Paging with All Call:

This arrangement requires a PABX station number
and V-9940 for each zone and an additional number
and V-9940 for all call. One-Way amplified Speaker
Assemblies and -24VDC power supplies are also
required.

• One Zone of Talkback Paging:
This arrangement requires one V-9940, one
V-9941A, one-zone talkback unit, appropriate 45
Ohm talkback speakers (maximum 2), and a
VP-624B power supply. See Note.

Centrex or C. O. Line Access to
Paging:

Note: Although the V-9940 will work on both
loop start or ground start lines, when using
Centrex service, ground start lines provide better
security against returned tones. In addition,
Centrex lines should be optioned for cut OFF
when disconnect occurs.

• One Zone of One-Way Paging:

One zone of One-Way Paging requires one Centrex
or C. O. Line, a V-9940, One-Way Amplified
Speaker Assemblies and a -24VDC power supply.

• Multi-Zone One-Way Paging:

Multi-zone One-Way Paging requires one Centrex or
C. O. Line, a V-9940, a dial select page control unit
(V-2003A, V-2006A, V-1109RTVA, V-119RTVA
or V-136RTHF), appropriate One-Way Amplified
Speaker Assemblies and a -24VDC power supply.

3

Note: All Call is included with the V-2003A,
V-2006A and the V-1109RTVA.

It may be added to the V-119RTVA with a V-1118
and to the V-136RTHF with a V-1134. See Note.

• One Zone of Talkback Paging:

One Zone of Talkback Paging requires one Centrex
or C. O. Line, one V-9940, one V-9941A, one zone
talkback unit, 45 Ohm talkback speakers (maximum

2) and a VP-624B power supply. See Note.

• Multi-Zone Talkback Paging:

Multi-Zone Talkback Paging requires one Centrex or
C. O. Line, one V-9940, a dial select page control
unit (V-2003AHF, V-2006AHF, V-1109RTHF,
V-119RTHF or V-136RTHF), appropriate talkback
speakers and a -24VDC power supply.

NOTE: One-way All Call is included with the
V-2003AHF, V-2006AHF, and V-1109RTHF. It
may be added to the V-119RTHF with a V-1118
and to the V-136RTHF with a V-1134. See Note.

Wiring of each arrangement is covered in the
Installation Section.

NOTE: When using the V-9940 Expandable
Station Level Paging Adapter to access multi-zone
or handsfree control units, it should be
understood that the quality and noise
characteristics of the C . O. Line circuit may
affect the operation of this equipment adversely.

Dip Switch Settings

The dip switch settings are crucial to proper
operation of the V-9940 and are different for each
application. The dip switches select the way the
V-9940 releases from the line and how long a page
may be made. There are three ways the V-9940
releases from the line that are dependent on dip
switch settings:

Open Loop Detect

The V-9940 detects a 150ms or longer break in loop
current one second after ring trip and release from
the line. The one second delay in line supervision is
allowed due to the instability of some C. O. and
Centrex lines for the first second after ring trip.

Dip switch settings: Set dip switches 1 and 8 "ON",
dip switches 2 through 7 "OFF".

NOTE: This setting provides unlimited page
length. In certain instances a default timeout
release is recommended. To select a default

timeout, turn one of dip switches 2 through 7
"ON". Refer to Figure 4 for the maximum page
length each dip switch allows.

110-16, 110-17, and 110-18 of the National
Electrical Code, ANSI/NFPA No. 70.

Time Out Release

The V-9940 will release from the line a
pre-determined amount of time after ring trip as
determined by dip switch settings.

Typical Applications: Access from a PABX Station
to one zone of talkback page (station level access not
normally used with talkback).

Dip Switch Settings: Set dip switches 1 and 8 "ON".
Set one of dip switches 2 through 7 "ON" to select
the maximum page length.

NOTE: This setting assigns a limited page length.
See PABX Station level Paging to determine if the
PABX is compatible for station level page.

Audio Sense Release

The V-9940 will release from the line after a
pre-determined amount of time that silence is
detected as determined by dip switch settings.

Typical Applications: Access from a PABX Station
to one zone of one-way page or multiple zones of
one-way page using multiple PABX stations and
multiple V-9940s.

Dip switch settings: Set dip switch 1 "OFF", dip
switch 8 "ON". Set one of dip switches 2 through 7
"ON" to select the length of time the unit stays active
after last sensing audio. (Normally dip switch 6 or 7

- for 8 or 4 seconds).

NOTE: This setting provides unlimited page
length. See PABX Station Level Paging to
determine if the PABX is compatible for station
level page. When used with talkback paging, the
talkback audio may delay or cancel the audio
sense release.

In some special applications, a manual reset can be
used to provide release from the line by providing a
momentary ground to the manual reset pin of the
V-9940.

INSTALLATION

Regulatory Information

This equipment is to be installed only in restricted
access areas (dedicated equipment rooms, equipment
closets or the like) in accordance with Articles

CAUTION: To reduce the risk of electric shock,

Refer servicing to qualified service personnel.

When using this equipment, basic safety precautions
should always be followed to reduce the risk of fire,
electric shock and injury to persons including the
following:

1. Never install telephone wiring during a
lightning storm.

2. Never install telephone jacks in wet locations
unless the jack is specifically designed for wet
locations.

3. Never touch uninsulated telephone wires or
terminals unless the telephone line has been
disconnected at the network interface.

4. Use caution when installing or modifying
telephone lines.

General

The following sections contain step-by-step
instructions for wiring the V-9940 and associated
Valcom equipment. If the results of a test do not
correspond with what is shown, DO NOT
PROCEED UNTIL THE PROBLEM HAS BEEN
CORRECTED.

During installation, Figure 2 may be referred to for
location and numbering of punchdown block. Refer
to Figure 3 for punchdown block pinouts and Figure
4 for dip switch settings.

NOTE: To aid system testing and balancing, be
sure to set the individual volume controls at
approximately ½ volume when installing one-way
amplified speaker assemblies.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Do not remove cover.

No user serviceable parts inside.

This symbol indicates that dangerous
voltage constituting a risk of electric
shock is present within this unit.

This symbol indicates that there are
important operating and maintenance
instructions in the literature accompanying
this unit.

4

Mounting

FIGURE 3 - PUNCHDOWN BLOCK PINOUTS

Remove the metal mounting plate from the rear of
the V-9940 enclosure. Using two #6 ¾ inch wood
screws, mount the plate in a vacant space on the
backboard with the telephone system common
equipment. Both mounting holes must be utilized
to insure secure mounting of the unit. See Figure
4A.

STATIONARY

AUX GND TERM.

ALL CALL OUT

AUX -24VDC OUT TERM

MANUAL RESET

8 OHM PAGE OUT

600 OHM PAGE OUT

BREAK

MAKE

Open the V-9940 enclosure to allow access to
connections and option switches. Slide the rear of
the unit (contains the board) onto the mounting
plate. Lock enclosure to mounting plate with screw

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

29 2423 2228 27 26 25 21 20 19 18 17 16

30

provided. Make connections. Replace cover and
lock in place with #6 ½ inch screws provided.

Power Connections

NOTE: Power is required for each V-9940 being
used. If multiple units are used, power for
additional units may be multiplied from pins 14
and 15 of a previous unit (pin 14 is "+" and pin 15
is "-").

• Unplug power supply.

• Connect -24VDC "B" battery (may be referred to

as "-" or "signal battery") from power supply to
pin 30 on V-9940 and "B" ground "+" or
"signal" ground) from power supply to pin 29.

• Connect -24VDC Ground from power supply to

telephone system Ground.

ON
OFF

1 8

Dip
Switches

-24VDC IN
ALL CALL IN

GROUND (+) IN

ALL CALL

AUDIO IN

MUSIC INPUT

FIGURE 4 - DIP SWITCH

SW OFF ON

1 Audio Sense

Enable

2 Not 1 Sec. 1 Second
3 Not 64 Sec. 64 Seconds
4 Not 32 Sec. 32 Seconds
5 Not 16 Sec. 16 Seconds
6 Not 8 Sec. 8 Seconds
7 Not 4 Sec. 4 Seconds
8 Loop Detect

Disable

ON
OFF

Time Out
Enable

Loop Detect
Enable

87654321

TIP IN

RING IN

• Power Test:
 a. Plug in power supply.
 b. If power reversal LED is lit:

 1. Unplug power supply.
 2. Reverse connections on pins 29, 30.

115

1630

FIGURE 2

LOCATION AND NUMBERING OF
PUNCHDOWN BLOCK AND DIP SWITCHES

Power
Reversal
Indicator

Punchdown
Block

• Unplug power supply.

PABX Connecting Arrangements:

NOTE: From the list below, determine the
arrangement being used and proceed to the
Figure indicated for step-by-step instructions.

• One Zone of One-Way Paging: Go to Figure 5.

• Multi-Zone One-Way Paging with All Call

 3. Repeat step 5.

(Multiple Talkpaths): Go to Figure 6.

• One Zone of Talkback Paging: Go to Figure 7.

5

FIGURE 4A

TO REMOVE COVER
LOOSEN SCREW,
THEN ACTIVATE LATCH

PLASTIC
COVER

WIREWAY OPENING
TO WALL PLATE AND
JUNCTION BOX

CIRCUIT BOARD
HOUSING ASSEMBLY

SNAP LATCH

METAL WALL
MOUNTING
PLATE

BRACKET
LOCKING
SCREW

WIRE TIE LOOP
WIRE TIE USED TO BUNDLE WIRES
ENTERING AND LEAVING TERMINAL AREA

.155 DIA. HOLES FOR MOUNTING TO
SINGLE OR DOUBLE GANG JUNCTION BOX
HOLE PATTERN MATCHES BOTH EURO
AND US JUNCTION BOXES

1.5 x 2 WIRE ACCESS OPENING
TO JUNCTION BOX

SNAP LATCH
FOR COVER

6

Centrex or C. O. Connecting Arrangements

From the list below, determine the arrangement being used and proceed to the Figure indicated for instructions.

• One Zone of One-Way Paging: Go to Figure 5.

• Multi-Zone One-Way Paging will All Call (Multiple Talkpaths): Go to Figure 6.

• Multi-Zone One-Way Paging (1 Talkpath): Go to Figure 8.

• One Zone Talkback Paging: Go to Figure 7.

• Multi-Zone Talkback Paging: Go to Figure 8.

ONE ZONE OF ONE-WAY PAGING

FIGURE 5

PABX, CENTREX, OR C. O. LINE ACCESS

V-9940 PUNCHDOWN BLOCK

123456789101112131415

30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

-24 Vdc

B BATTERY
B GROUND (+)

-24 Vdc POWER
SUPPLY

MUSIC
SOURCE

RINGGND

TIP

PABX

TR

VALCOM ONE-WAY
AMPLIFIED SPEAKER
ASSEMBLIES

WIRING INSTRUCTIONS

Place a check by each step as it is completed.
____ 1. Connect Tip of the PABX, Centrex or C. O. Line to pin 16 and Ring to Pin 17 of the V-9940.
____ 2. Connect Tip of the Valcom one-way amplified speaker assemblies being used to the V-9940 pin 8 and

Ring to pin 9.
____ 3. Connect the Ground Lead from the speaker assemblies to the power supply "B" Ground (or "+").
____ 4. Connect the -24VDC lead from the speaker assemblies to the power supply "B" Battery (or "-").
____ 5. Connect the output of a low level music source (optional) to pins 21 and 22.
____ 6. Dip Switch Settings:
PABX: Switch 1 must be "OFF". Turn "ON" one of switches 2 to 7 to select the length of time the

unit stays active after last sensing audio (reset timing). SWITCH 8 MUST BE "ON".

Centrex or C. O. Line: Set Switches 1 and 8 "ON" and 2 through 7 "OFF". See section titled "Dip

Switch Settings" for additional information regarding dip switched.

____ 7. When connections are complete replace cover and lock in place using the #6 ½ inch screws provided.

Plug in power supply.

7

MULTI-ZONE ONE-WAY PAGING WITH

ALL CALL (MULTIPLE TALKBACK)

PABX, CENTREX, OR C.O. LINE ACCESS

FIGURE 6

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Zone 1
Station
Number

Power
Supply

Tip
Ring

-24VDC
Gnd

Zone 1
Amplified
Speaker
Assemblies

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Zone 2
Station
Number

Power
Supply

Tip
Ring

-24VDC
Gnd

Zone 2
Amplified
Speaker
Assemblies

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

All Call
Station
Number

(+) Power
(-) Supply

WIRING INSTRUCTIONS

Place a check by each step as it is completed.
___ 1a. Connect Tip of the PABX station number for zone one to pin 16 and Ring to pin 17 of the V-9940

being used for zone one.
___ 1b. Connect Tip of the amplified speaker assemblies for zone one to pin 8 and Ring to pin 9 of the V-9940.
___ 1c. Connect the Ground lead of the speaker assemblies to the power supply Ground.
___ 1d. Connect the -24VDC lead of the speaker assemblies to the power supply -24VDC ("B" Battery or "-").
___ 2. Repeat Step 1 for each zone. REMEMBER, each zone requires its own station number and V-9940.
___ 3. All Call Connections:
___ 3a. Connect Tip of the All Call station number to pin 16 and Ring to pin 17 of the V-9940.
___ 3b. Strap from pin 9 of the all call V-9940 to pin 26 of each of the V-9940s being used for individual

zones.

____3c. Strap from pin 13 of the all call V-9940 to pin 28 of each of the V-9940s being used for individual

zones.

____ 4. Music Input: Background music may be provided on a per zone basis. Connect a low level source to

pins 21 and 22 of each V-9940 to receive music.
____ 5. Dip Switch Settings: Switch settings are the same for the individual zones and the all call.
____ 5a. PABX - Switch 1 must be "OFF". Turn "ON" one of switches 2 to 7 to select the reset timing (the

length of time the unit stays active after last sensing audio). Turn switch 8 "ON".
____ 5b. Centrex or C. O. Line - Set switches 1 and 8 "ON", 2 to 7 "OFF". See Section titled "Dip Switch

Settings" for additional information regarding dip switches.
____ 6. Adjust volume at individual speakers.
____ 7. When connections are complete, replace cover and lock in place using the #6 ½ inch screws provided.

Plug in power supply.

8

V-9940 PUNCHDOWN

WIRING INSTRUCTIONS

Place a check by each step as it is completed.
____ 1. Connect Tip of the PABX Station, Centrex or C. O. Line to pin 16 of the V-9940.
____ 2. Connect Ring of the line to pin 17.
____ 3. Crossconnect pin 6 of the V-9940 to pin 1 of the V-9941A.
____ 4. Crossconnect pin 7 of the V-9940 to pin 2 of the V-9941A.
____ 5. Connect 45 Ohm talkback speakers (maximum 2) to pins 6 and 7 of the V-9941A.
____ 6. V-9941A Power Connections:
____ 6a. Connect -24VDC Ground (+) to pin 3 of the V-9941A.
____ 6b. Connect -24VDC Battery (-) to pin 4 of the V-9941A.
____ 7. Dip Switch Settings:
____ 7a. PABX Access: Set switches 1 and 8 "ON". Turn "ON" one of switches 2 to 7 to select the maximum
page length.
____ 7b. Centrex or C. O. Line access: Set switches 1 and 8 "ON". Set switches 2 through 7 all "OFF". See

section titled "Dip Switch Settings" for additional information regarding dip switches.
____ 8. Refer to the V-9941A installation instructions for proper volume procedure.
____ 9. When all connections are complete, replace cover and lock in place using the #6 ½ inch screws
provided. Plug in power supply.

FIGURE 7

ONE ZONE OF HANDSFREE PAGING

PABX, CENTREX, OR C. O. LINE ACCESS

123456789101112131415

30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

T
R

PABX Station, Centrex
Number, or C. O. Line

-24 Vdc
GND

-24 Vdc
Power Supply

4
3

V-9941A

2
1

6
7

9

MULTI- ZONE ONE WAY OR HANDSFREE

WIRING INSTRUCTIONS

Place a check by each step as it is completed.
____ 1. Connect Tip of the Centrex or C. O. Line to pin 16 of the V-9940.
____ 2. Connect Ring of the line to pin 17.
____ 3. Crossconnect pin 6 of the V-9940 to the Tip "WHITE/BLUE" of a Valcom multi-zone dial select page

control unit (such as the V-1109RTVA or V-1109RTHF).
____ 4. Crossconnect pin 7 of the V-9940 to the control unit Ring "BLUE/WHITE".
____ 5. Refer to the Installation Manual supplied with the control unit for speaker and power connections.
____ 6. Refer to the Installation Manual supplied with the control unit for proper volume adjustment procedures.
____ 7. Dip Switch Settings: Set dip switches 1 an 8 "ON". Set switches 2 to 7 all "OFF". See Section titled

"Dip Switch Settings" for additional information regarding dip switches.
____ 8. When all connections are complete, replace cover and lock in place using the #6 ½ inch screws

provided. Plug in power supply.

FIGURE 8

CENTREX OR C. O. LINE

V-9940 PUNCHDOWN

123456789101112131415

30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

T
R

Centrex Number
or C. O. Line

BL/WH

WH/BL
B Ground (+)
B Battery (-24VDC)

-24VDC
Power Supply

V/SL
SL/V

Zone
Outputs

Valcom Dial Select

Multi-Zone Page Unit

Speakers
(Type depends
on Control Unit)

10

AUDIO

TONE

8 OHM

OPERATION

Circuit Description

The V-9940, Station Level Page Adapter, has three
inputs: Tip and Ring from the line, music and all
call; and two outputs: 8 Ohm and 600 Ohm.

Any input will provide audio at both the 8 Ohm and
600 Ohm outputs. Signals coming from the 8 Ohm
output will be maintained 7dB below the level of the
paging (this is not user adjustable). There is no
modification of page or music signals when using
the 600 Ohm output. The 600 Ohm output also
provides a loop on access and may be used with loop
start paging equipment.

In the idle state, signals from the music input will
appear on both the 8 Ohm and 600 Ohm outputs.
On receipt of superimposed ring generator on Tip
and Ring, the V-9940 will be activated and will
place a loop across the station Tip and Ring for ring
trip. An answer verification tone will then be
returned to the calling party and Tip and Ring audio
will be connected to the 8 Ohm and 600 Ohm
outputs.

After access, the reset circuitry is turned on. If the
unit is set for loop detect, it will ignore any open
loop conditions for the first second, then it will
release when it senses an open loop on Tip and Ring
lasting at least 150ms. If you are using the audio
sense reset, the unit will stay on line until sensing a
lack of audio (-22dB or less) for the period set by the
dip switches. If using the time out reset, the unit
will stay on the line for the preset length of time and
then will reset, whether the page is complete or not.
Upon release, the music source is reconnected to the
outputs.

SIMPLIFIED SCHEMATIC

All call, if connected, will override both the music
and page inputs. All call requires an additional
station port for access and must be wired as shown in
Figure 6. When the all call station number is dialed,
any paging in progress will be overridden and an
alert tone will be returned to the overridden parties.
If they remain on line, on completion of the all call
page, they will be reconnected to their respective
zones and all timers will be reset, allowing a full
page again on each zone.

TECHNICAL ASSISTANCE

When trouble is reported, verify that power is being
supplied to the unit and there are no broken
connections. Check voltages for proper polarity on
the crossconnect block. Table 1 identifies symptoms
of possible problems with solutions. If a spare unit is
available, continue to troubleshoot by substituting
the spare unit for the suspected defective unit.

Assistance in troubleshooting is available from the
factory. When calling, you should have a VOM,
several clip leads, a telephone test set available and
call from the job site. Call [phone] for
Technical Support or call [phone] for
Valcom 24-Hour Faxback System or visit our website
at http://www.valcom.com.

The V-9940 is not field repairable. Valcom, Inc.
maintains service facilities in Roanoke, VA. Should
repairs be necessary, attach the company name,
address, phone number, contact person and the
nature of the problem. Send the unit to:

Valcom, Inc.

Repair and Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

ALL CALL IN
ALL CALL OUT
MANUAL RESET

ACCESS

MUSIC IN

ALL CALL
AUDIO IN

T
R

-24VDC
GROUND

CONTROL,
OPTION &
TIMING
CIRCUITS

RING
DETECT

LOOP
XFORMER

POWER
SUPPLY

SENSE

K2

-12

XFORMER

-24

XFORMER

K3

GEN.

PREAMP
AGC

XFORMER

600 OHM OUT

MAKE

STATIONARY

BREAK

OUT

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VALCOM LIMITED WARRANTY

Valcom, Inc. warrants its products to be free from defects in materials and workmanship under conditions of normal use and service for a
period of one year from the date of shipment. The obligation under this warranty shall be limited to the replacement, repair or refund of
any such defective device within the warranty period, provided that:

1. inspection by Valcom, Inc. indicates the validity of the claim;

2. the defect is not the result of damage, misuse or negligence after the original shipment;

3. the product has not been altered in any way or repaired by others and that factory sealed units are unopened (a service charge

4. freight charges for the return of products to Valcom are prepaid;

5. all units ‘out of warranty’ are subject to a service charge. The service charge will cover minor repairs (major repairs will be

This warranty is in lieu of and excludes all other warranties, expressed or implied and in no event shall Valcom, Inc. be liable
for any anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in connection with the
purchase, operation or use of the product.

This warranty specifically excludes damage incurred in shipment. In the event a product is received in damaged condition, the carrier
should be notified immediately. Claims for such damage should be filed with the carrier involved in accordance with the F.O.B. point.
Headquarters: In Canada
Valcom, Inc. CMX Corporation
5614 Hollins Road 35 Van Kirk Drive #11 and 12
Roanoke, VA 24019-5056 Brampton, Ontario L7A 1A5
Phone: [phone] Phone: [phone]
FAX: [phone] FAX: [phone]

plus parts and labor will be applied to units defaced or physically damaged);

subject to additional charges for parts and labor).

TABLE 1 - TROUBLESHOOTING CHART

Symptoms Solutions

1. Red power reversal LED is lit. A. Reverse power connections to pins 29 and 30.

2. Will not trip ringing. A. Verify -24VDC on pins 29 (+) and 30 (-).
B. Verify ring voltage is present on pins 16 and 17

(75VAC minimum).

3. No output from amplified speaker assemblies. A. Listen (using a lineman’s test set) for audio on 8

Ohm output (pins 8 and 9).
B. Verify -24VDC to speakers.
Remember, GND is (+), -24VDC is (-).

4. Unit will never release. A. Refer to the appropriate connection Figure and
verify the dip switches are set properly.

5. All call does not work. A. Verify connections according to Figure 6.

B. Verify "all call out" of master unit is connected to

"all call in" of all other units.

C. Verify 8 Ohm output of master unit connected to

"all call audio in" of all other units.

D. Verify proper voltage and polarity on pin 29 (+)

and 30 (-) of master unit.

E. Verify ring voltage is present on pins 16 and 17 of

master unit when all call number is dialed.

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