42004-259E
Pub. 42004-259E
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 723-003 24 V DC
Remote Handset/Speaker Amplifier
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics. GAITronics retains all intellectual property and other rights in or to the information contained herein, and
such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
The Model 723-003 24 V DC Remote Handset/Speaker Amplifier is an important component of the
Page/Party® communications system and an integral part of GAI-Tronics desktop, desk-edge, and flushmount stations. It has been designed to be remotely mounted within an enclosure, allowing the
associated subsets to be placed on a desktop, mounted on the side of a desk, or to be flush mounted. The
Model 723-003 Remote Handset/Speaker Amplifier is constructed of fabricated steel durable enough for
even the toughest industrial environments.
Installation
WARNING
Explosion Hazard – Substitution of components may impair suitability for
Class 1, Div. 2 usage.
CAUTION
Do not install this equipment in hazardous areas or areas other than those indicated on the
equipment approval list in the “Specifications” section of this manual. Such installation may cause
a safety hazard and consequent injury or property damage.
To install the remote handset/speaker amplifier, plug the amplifier into the appropriate enclosure, and
tighten the four screws in the corners of the amplifier. See Figure 1 for typical installation details.
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374  800-492-1212  Fax: 610-796-5954
VISIT WWW .GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Model 723-003 24 V DC Remote Handset/Speaker Amplifier
Pub. 42004-259E
Page 2 of 6
Model 723–003 24 V DC Remote Handset/Speaker Amplifier is shown mounted in the 7245 Series
enclosure and connected to the Model 7265-101 Desktop Subset. Remember, while your specific
configuration may be different, the installation details will be the same.
Figure 1. Installation of Model 723-003 Remote Handset/Speaker Amplifier
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Model 723-003 24 V DC Remote Handset/Speaker Amplifier
Pub. 42004-259E
Page 3 of 6
Operation
GAI-Tronics offers two types of Page/Party® systems: Single party with one page line and one party line,
and multi-party with one page line and five party lines allowing up to five simultaneous two-way
conversations.
For single party systems, complete the following steps to make a page announcement:
1. Lift the handset from the cradle.
2. Depress and hold the handset pressbar.
3. Speak directly into the microphone to broadcast your announcement over the loudspeakers.
4. Release the handset pressbar, and if requested, wait for a response.
The paged individual(s) responds by picking up a station handset.
For multi-party systems, complete the following steps to make a page announcement:
1. Lift the handset from the cradle.
2. If party line conversation is desired, rotate the selector switch to an unoccupied party line.
3. Depress and hold the handset pressbar.
4. Speak directly into the microphone to broadcast your announcement over the loudspeakers.
5. Release the handset pressbar, and if requested, wait for a response.
The paged individual(s) responds by picking up a station handset and turning the selector switch to the
requested party line.
With either type of system, the full duplex party line communication is not broadcast over the system
speakers. Other individuals can also pick up and join the conversation at any time. Always return the
handset to the cradle following a page or a party line conversation.
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Pub. 42004-259E
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Model 723-003 24 V DC Remote Handset/Speaker Amplifier
Maintenance
The following adjustments are accessible through the rear chassis of the remote amplifier using a small
standard screwdriver. Each adjustment is clearly labeled:

Microphone Gain: adjusts the gain level from the microphone signal to the page or party lines.

Receiver Sidetone: adjusts the signal transmitted from the microphone to the receiver of a handset.

Receiver Volume: adjusts the gain level from a party line to the receiver.
Troubleshooting
The following table lists some hints to aid technicians in troubleshooting:
Problem
Solution
Feedback/distortion (a hum or
buzz on the line) occurs during
all Page/Party® station operation.
The line may be improperly terminated. Inspect the system cable
for loose connections, shorts, and grounds. Line balance assembly
connections are critical.
Associated speaker level requires
adjustment.
1. Adjust the speaker volume control located on the front panel
of the subset, if equipped. Refer to Figure 1.
2. Adjust the speaker volume control at the amplifier. Use a
small standard screwdriver to perform these adjustments.
Refer to Figure 1
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Model 723-003 24 V DC Remote Handset/Speaker Amplifier
Pub. 42004-259E
Page 5 of 6
Specifications
Power input, voltage .......................................................................... 21–28.8 V dc range, 25 V dc nominal
Power consumed ............................................................................................................ Zero signal: 2.75 W
Maximum signal: 27 W
Construction/Finish................................................................ 16-gauge cold-rolled steel/gray polyurethane
Handset Amplifier
Output level .................................................................................... 1.5 VRMS nominal into 33-ohm load
Output limiter .............................................................................................................. 1.5 VRMS nominal
Gain ................................................ 55 dB nominal (below limiter level); adjustable from 40 to 63 dB
Frequency response .................................................................... 250–4,000 Hz, +0\–3 dB ref. @ 1 kHz
Distortion............................................................................................... 1.5% maximum THD @ 1 kHz
Controls ...................................................................... Microphone gain, receiver volume, and sidetone
(adjusted through the access holes on the rear surface of the unit.)
Speaker Amplifier
Output ........................................................................................ Push-pull, Class B, 12 watts minimum,
with nominal supply voltage
Amplifier sensitivity......................................................................................... 0.5 V ac, at rated output
Frequency response .................................................................... 250–4,000 Hz, +0/–3 dB ref. @ 1 kHz
Distortion.................................................................................................. 1% maximum THD @ 1 kHz
Input impedance ................................................................................................... 50,000 ohms nominal
Controls ............................................................................ Speaker volume (adjusted through an access
hole behind the nameplate on the front panel)
Temperature range...................................................................... −22 F to +158 F (−30 C to +70 C)
Dimensions ........................................ 8.1 H  8.1 W  3.0 D inches behind panel (3.5 D in front of panel)
(206  206  76 [89] mm)
Shipping weight .................................................................................................................... 5.6 lbs. (2.6 kg)
Approvals
NRTL certified for use in US and Canada.............................................. Class I, Div. 2, Groups A, B, C, D,
when mounted into a certified GAI-Tronics Model 7245 Amplifier Enclosure
Temperature Code..................................................................................... T3C (Maximum ambient = 70º C)
CE Mark
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Model 723-003 24 V DC Remote Handset/Speaker Amplifier
REPLACEMENT PARTS
Part Number
Description
10440-003
Maintenance Cable, 24-pin
12508-002
Screw Kit (32 pack)
12530-002
Transformer, Connector Subassembly Kit
12523-001
GTC Nameplate Kit (5 pack)
12604-004
Fuse, Slow 2A (10 pack)
12604-012
Fuse, 0.2A (10 pack)
25210-005
Gasket (1 piece)
69723-202
PCBA Replacement
12601-001
PCBA Standoffs (10 pack)
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Warranty
Equipment.
GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any
GAI-Tronics equipment supplied hereunder shall be free of defects in material and workmanship, shall
comply with the then-current product specifications and product literature, and if applicable, shall be fit
for the purpose specified in the agreed upon quotation or proposal document. If (a) Seller’s goods prove
to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above,
Buyer may return such goods to GAI-Tronics nearest depot repair facility, freight prepaid, at which time
they will be repaired or replaced, at Seller’s option, without charge to Buyer. Repair or replacement shall
be Buyer’s sole and exclusive remedy. The warranty period on any repaired or replacement equipment
shall be the greater of the ninety (90) day repair warranty or one (1) year from the date the original
equipment was shipped. In no event shall GAI-Tronics warranty obligations with respect to equipment
exceed 100% of the total cost of the equipment supplied hereunder. Buyer may also be entitled to the
manufacturer’s warranty on any third-party goods supplied by GAI-Tronics hereunder. The applicability
of any such third-party warranty will be determined by GAI-Tronics.
Services.
Any services GAI-Tronics provides hereunder, whether directly or through subcontractors,
shall be performed in accordance with the standard of care with which such services are normally
provided in the industry. If the services fail to meet the applicable industry standard, GAI-Tronics will reperform such services at no cost to buyer to correct said deficiency to Company's satisfaction provided
any and all issues are identified prior to the demobilization of the Contractor's personnel from the work
site. Re-performance of services shall be Buyer's sole and exclusive remedy, and in no event shall GAITronics warranty obligations with respect to services exceed 100% of the total cost of the services
provided hereunder.
Warranty Periods.
Every claim by Buyer alleging a defect in the goods and/or services provided
hereunder shall be deemed waived unless such claim is made in writing within the applicable warranty
periods as set forth above. Provided, however, that if the defect complained of is latent and not
discoverable within the above warranty periods, every claim arising on account of such latent defect shall
be deemed waived unless it is made in writing within a reasonable time after such latent defect is or
should have been discovered by Buyer.
Limitations / Exclusions.
The warranties herein shall not apply to, and GAI-Tronics shall not be
responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent
caused by Buyer’s neglect, failure to follow operational and maintenance procedures provided with the
equipment, or the use of technicians not specifically authorized by GAI-Tronics to maintain or service the
equipment. THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE IN LIEU OF AND
EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER EXPRESS OR IMPLIED BY
OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Return Policy
If the equipment requires service, contact your Regional Service Center for a return authorization number
(RA#). Equipment should be shipped prepaid to GAI-Tronics with a return authorization number and a
purchase order number. If the equipment is under warranty, repairs or a replacement will be made in
accordance with the warranty policy set forth above. Please include a written explanation of all defects to
assist our technicians in their troubleshooting efforts.
Call 800-492-1212 (inside the USA) or 610-777-1374 (outside the USA) for help identifying the
Regional Service Center closest to you.
(Rev. 10/06)
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