GAI-Tronics 751-901 User Manual
Pub. 42004-659L2F
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
751-901 SmartSeries®
Speaker Amplifier
T ABLE OF C ONTENTS
Confidentiality Notice .....................................................................................................................1
General Information .......................................................................................................................1
Product Overview ................................................................................................................................... 1
System Requirements and Limitations ................................................................................................. 1
Features and Functions .......................................................................................................................... 1
Description of Major Components ........................................................................................................ 2
External Components ............................................................................................................................................ 2
Internal Components ............................................................................................................................................. 3
Block Diagram ......................................................................................................................................... 4
Interfaces ................................................................................................................................................. 4
Installation ......................................................................................................................................5
Operation .........................................................................................................................................5
Optional Features .................................................................................................................................... 5
Maintenance ....................................................................................................................................6
Adjustments ............................................................................................................................................. 6
Minimum Level Adjustment ................................................................................................................................. 7
Offset Level Adjustment ....................................................................................................................................... 7
VLC Level Adjustment ......................................................................................................................................... 7
Internal Adjustments .............................................................................................................................. 7
Troubleshooting ...................................................................................................................................... 8
How to Diagnose Assembly Faults ......................................................................................................... 9
Specifications ................................................................................................................................10
Replacement Parts ................................................................................................................................ 11
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
V
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
PUB. 42004-659L2F
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
751-901 SmartSeries®
Speaker Amplifier
Confidential ity 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
Product Overview
This manual discusses installing, operating, and maintaining the SmartSeries® 751-901 Speaker
Amplifier. The SmartSeries
station’s speaker. It also serves as a control interface to optional devices such as the party line End-ofLine (EOL) Module or the SmartSeries
SmartSeries
®
RTU enclosure.
®
751-901 Speaker Amplifier broadcasts page announcements over the
®
station Remote Terminal Unit (RTU) when installed into a
System Requ irements and Limitatio ns
The SmartSeries® 751-901 Speaker Amplifier is designed to provide an intelligent speaker amplifier for
use on the GAI-Tronics multi-party system cable (system cable) in either a standard Page/Party
or an ADVANCE system.
®
system
Fea tures and Functions
Measure the ambient noise and adjust the speaker
output level accordingly.
Supervise the local speaker.
®
Support an optional SmartSeries
which monitors and supervises input and output
devices.
station RTU,
Support an optional party line EOL Module,
which supervises party line 1.
Transfer data messages on the system cable.
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
V
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Pub. 42004-659L2F
751-901
SmartSeries
®
Speaker Amplifier PAGE 2 of 11
Description of Major Components
These assemblies include exter nal com ponent s acces sible to the user as well as int erna l componen ts or
subassemblies.
External Components
To the right of the product label is the nameplat e that c oncea ls the Us er Lev el Ad justment control.
Figure 1. Front View
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Pub. 42004-659L2F
751-901
SmartSeries
®
Speaker Amplifier PAGE 3 of 11
Internal Components
As shown from the side in Figure 2, the assembly contains the following components or subassemblies:
Chassis
Front panel affixed to the front of the chassis
FSK/P PCBA (printed circuit board assembly) (Ref. 10) affixed to the rear of the front panel
Speaker Amp/Power Supply PCBA (Ref. 9) affixed to the rear of the chassis, with a plug (P1) at the
top, pointing to the rear
Figure 2. Side View
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