Valcom v-763 Service Manual

TECHNICAL ASSISTANCE

When trouble is reported, verify there are no broken connections to the unit and
consult the Troubleshooting Chart. Assistance in troubleshooting is available from
the factory. When calling, you should have a Volt-Ohm meter and a lineman’s test
set available and be calling from the job site. Call [phone] and ask for
Technical Support, or call [phone] for Valcom 24-hour Faxback System or
visit our website at http://www.valcom.com.

Valcom equipment is not field repairable. Valcom, Inc. maintains service facilities in
Roanoke, VA. Should repairs be necessary, attach a tag to the unit clearly stating
your 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

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 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.

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 L7A1A5
Phone: [phone] Phone: [phone]
FAX: [phone] FAX: [phone]

INSTALLATION INSTRUCTIONS FOR

AMPLIFIED DESK SPEAKER

MODEL NO. V-763

Issue 7 947163

VALCOM ONE-WAY AMPLIFIED DESK SPEAKER

Valcom Desk Speaker, V-763, is self-amplified and may be used to provide paging
from any one-way or talkback page control. The volume may be adjusted with the
knob on the front of the housing. The V-763 requires -24VDC, 50mA (1 Valcom
power unit).

Model V-763-BK Black
Model V-763-W White
Model V-763-GY Gray

NOMINAL SPECIFICATIONS

Input Impedance: 600 Ohm nominal
Input level: -10dBm nominal
Current at -24VDC: 45mA
Dimensions: 3.90" H x 5.10" W x 3.20" D
(9.91cm H x 12.95cm W x 8.13cm D)
Weight: .6 lbs. (.27 kg)

WIRING

Make connections as shown below using standard, twisted telephone cable. Limit the
number of speakers to five (5) per 500 foot run.

Typical Connections

Page
Out

Valcom Page
Control

Tip/A
Ring/B

-24VDC
Gnd

One-Way
Amplified
Speaker

Valcom -24VDC
Power Supply

Ground

-24VDC
Tip
Ring

- Black

- Yellow

- Green

- Red

The V-763 can be used on a desk or wall mounted. The front cover may be rotated
to match positioning. Four rubber feet are included with the V-763 to prevent
movement on a desk surface.

Key hole patterns are located on the inside rear surface of the enclosure for wall
mounting. When wall mounting, remove the front cover, mount and replace the front
cover. Use a 11/32" drill bit to drill the center hole and a 3/16" bit to drill either of
the outer holes.

TROUBLESHOOTING CHART

Problems

No Audio from
Speaker

Probable Causes and Corrections

1. Check that volume control is turned up (Clockwise).

2. Using a lineman’s test set, check for the proper audio
level on the Tip/A & Ring/B leads, and if necessary at
the source.

Low Volume from
the Speaker

1. Check that volume control is turned up.

2. Check voltage at the speaker when in use (-18 to -24
VDC required).

3. Using a lineman’s test set, check for proper audio level
on the Tip/A & Ring/B leads. It is possible some low
level audio will be heard with only one side of Tip/A
and Ring/B connected.

Loud Squeal
(feedback)

1. Lower volume of speaker.

2. Move speaker to location further from phone.

3. Install confidencer on phone in severe problem area.

NOTE: Do not connect this speaker directly to 25/70/100V amplifier
as damage to both the amplifier and speaker may occur. A V-1095
may be used to allow the use of Valcom self-amplified speakers on
70V speaker lines.
MOUNTING