Valcom v-9927a Service Manual

V-9927A

DIGITAL MULTI-TONE GENERATOR

INTRODUCTION

The V-9927A was designed with ease of installation
and flexibility in mind. Connections are by screw
terminals located on the edge of the PCB. The
various options and tones are set using option blocks
located inside the enclosure on the PC Board.

The V-9927A is a microprocessor controlled multi­tone generator capable of producing a variety of tone
signals for various applications. It is functional and
backward compatible with the previous V-9927.

Note: Double check all wiring as connections to
the unit are different.

This equipment has been tested and found to
comply with the limits for a Class A digital device
pursuant to Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against
harmful interference when this equipment is operated
in a commercial environment. This equipment
generates, uses and can radiate radio frequency
energy and if not installed and used in accordance
with the instruction manual, may cause harmful
interference to radio communications. Operation of
this equipment in a residential area is likely to cause
harmful interference in which case the user will be
required to correct the interference at his/her own
expense.

VSP-9927A

Issue 4

INSTALLATION

Product is intended for wall mounting only. When
mounting, open enclosure and remove circuit board.
Screw back of enclosure to backboard near the
telephone system common equipment. Snap circuit
board back in place. Both mounting holes must

be utilized to insure secure mounting of the unit.

Make connections and set tones, using option
blocks, as required for the specific application.
Refer to Tone Table on page 2 for tone descriptions.

Replace cover and plug in power supply.

OPERATION

All Tones (Except Code Call)

Operation of the V-9927A is accomplished by
applying a connection between the COM (Common)
terminal on the terminal block and the desired tone
number (1-8).

SPECIFICATIONS

Power Requirements:

-24VDC “B” Battery at 100mA

Operating Environment:

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

Nominal Input/Output Specifications:

Input Impedance: 600 Ohms
Output Impedance: Less than 4 Ohms
Min. Output Load Impedance: 20 Ohms
Audio Input: 0dBm nominal
Maximum Tone Output: > 0dBm single tone

Physical Dimensions:

8.20”H X 4.55”W X 2.30”D
(20.83cm H x 11.56cm W x 5.84cm D)
Weight: 1.5 lbs (0.68 kg)

The Tone selected by terminal number 1 has priority
over others. If multiple tone inputs are being used, it
is possible to sequence tones by closing the appro­priate contacts in the desired sequence. However,
Tone number 1 will always be placed first on the list
when it has been activated.

If multiple tones are selected at the same time, the
LOWEST tone number will have priority. If the
lowest contact is open, then the next lowest tone
number will be activated.

When a Tone is activated the INPUT source will be
faded out in 0.75 seconds if P5 is out or will be faded
out in 0.25 seconds if P5 is IN.

The V-9927A has a buffer for 32 tones. If more than
32 tones are entered within a short period, the
V-9927A will drop the last tone entered.

Figure 2 illustrates several of the ways the V-9927A
can be used with other Valcom equipment.

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Code Call Operation

When the V-9927A is connected to the V-9923A code
call unit, the V-9927A will respond to the contact
closure inputs and issue single chimes in response
(see Figure 2).

At the beginning of a Code Call sequence, the
INPUT source will be faded down about 6dB. It will
remain at this level until the CODE CALL sequence
has completed (including the interdigit time). At that

TONE TABLE

CONNECTION

ON

JP1 P3

COM - TONE 1
COM - TONE 2
COM - TONE 3
COM - TONE 4
COM - TONE 5
COM - TONE 6
COM - TONE 7
COM - TONE 8
COM - TONE 1
COM - TONE 2
COM - TONE 3
COM - TONE 4
COM - TONE 5
COM - TONE 6
COM - TONE 7
COM - TONE 8

OPTION

BLOCK DESCRIPTION

IN
IN
IN
IN
IN
IN
IN

IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT

* WHOOP, 698Hz, 3.9 seconds (approx.) 2 cycle minimum
* DUAL CHIME, 880Hz/698Hz
* BURST, 880Hz, 1/2 second on, 2 seconds minimum
* STEADY, 880Hz, 3 seconds minimum
TeleBell 986/784Hz, 11 per second, 10 minimum
Chimes, 986, 784, 659, 523Hz order
Chimes, 880, 698, 587, 494Hz order
CODE CALL CHIME, 784Hz (V-9923A standard)
> SIREN, 659Hz, center 1 cycle (approx.) 0.3Hz
> WHOOP (yelp) 659Hz, 2.5Hz, 4 minimum
> WARBLE, 494/986Hz, 6Hz rate
> STEADY 698Hz, 1 second minimum
> BURST (pulse), 494Hz, 4.5Hz rate
Chimes 659/784Hz
Chimes 986/784Hz
CODE CALL CHIME, 784Hz (V-9923A Standard)

time, the INPUT source will be faded back up to
normal level.

When using the CODE CALL option with other tone
options, the CODE CALL may be interrupted to place
other tones in the sequence (including Tone number
1 with higher priority). However, the CODE CALL
may be out of sequence for the period that this
occurs.

NOTE: * denotes V-9927 compatible tones

> denotes “USA Standard Immediate Evacuation signal for industrial areas”

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IN

P4 P1

P5

1 2 3 4 5 6 7 8

T2 T1

IN

P6

Determines the fadeout duration of the Input Source. The INPUT source will be faded out in 0.75

Option Blocks (Jumpers shown in factory default setting))

FIGURE 1

JP1

OUT

UNMUTE

MUTE

BURST
CONT

Adjust for
Desired
Output Level

Green LED
on when power
is present

P2 P3

TONE BANK
SELECT

POWER
ON

OUT

Compatibility with the V-9927
Set P3 to "IN" position

Set P1 for BURST or CONT as required
Set P4 to UNMUTE
Set P5 to "IN"
TONE inputs 1-4 correspond to WHOOP,
CHIME, BURST, and STEADY.

CODE CALL is available on TONE input 8.

TONE
LVL

Power Supply

-24VDC
(-)

(+)

Connect COM to
Desired Tone

Signal In
(Optional)

TONES

Relay
Contact

COM SIGNAL

IN

COM SIGNAL

OUT

GND -24V

Signal
Out

Description of Jumpers
P1 (BURST/CONT) - Sets the mode of the V-9927A. The BURST function allows one (1) tone (or sequence)

for each closure of the TONES input. The CONT function is continuous; the tone (or sequence) will
repeat while the closure on the TONES input (1-8) remains activated.

P3 (TONE BANK Select; OUT/IN) - Activates tones. Refer to the Tone Table (page 2) to determine jumper
placement for the desired tones.

P4 (UNMUTE/MUTE) - Determines if SIGNAL IN is muted or unmuted. With UNMUTE selected, the signal
returns after completion of a designated tone (or sequence) even if the relay on the TONES input (1-8)
remains connected. With MUTE selected, the signal remains off after completion of tones even if the relay
on the TONES input (1-8) is connected.

P5 (OUT/IN) ­seconds if P5 is OUT or will be faded out in 0.25 seconds if P5 is IN.

P2 & P6 - Not used on this version.

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TECHNICAL ASSISTANCE

When trouble is reported, verify the unit in question
is turned on (the green ON LED should be observed)
and all connections are secure. Assistance in
troubleshooting is available from the factory. When
calling, you should have a VOM available and be
calling 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.

VALCOM LIMITED WARRANTY

Valcom, Inc. warrants its products to be free from detects 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 plus parts and labor will be applied to units defaced or physically damaged);

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 subject to additional charges for parts and labor).

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.

Valcom equipment is not field repairable. Valcom
maintains service facilities in Roanoke, VA. Should
repairs be necessary, attach a tag to the unit clearly
stating company name, address, phone number,
contact person and the nature of the problem. Send
the unit to: Valcom, Inc.

Repair & Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

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
Valcom, Inc.
5614 Hollins Road
Roanoke, VA 24019-5056
Phone: [phone]
FAX: [phone]

In Canada:
CMX Corporation
35 Vank Kirk Drive #11 and 12
Brampton, Ontario L7A 1A5
Phone: [phone]
FAX: [phone]

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