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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
Page 2
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
Page 3
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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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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751-901
SmartSeries
®
Block Diagram
Pub. 42004-659L2F
Speaker Amplifier PAGE 4 of 11
The P1 connector on the rear of the Speaker Amp/Power Supply PCBA plugs into the socket in an
enclosure connected to the system cable, access ing the Page/Par ty
®
lines and ac power. Refer to Figure 3.
The Speaker Amp/Power Supply PCBA contains the low voltage power supplies and the speaker
amplifier circuitry.
Connector J1A and J1B on the Speaker Amp/Power Supply connects regulated +5 V dc, +/−15 V dc, and
V
voltages along with control, monitoring, and line signals to the J1A and J1B on the FSK/P PCBA.
RLY
Connector J2 of the Speaker Amp/Power Supply PCBA connects to optional external devices.
Figure 3. Block Diagram
Interfaces
The assembly interfaces to the system cable, an external loud speaker, and auxiliary devices via P1, a
16-pin connector. All connections to the system cable are made by qualified installation technicians
during the system installation. Direct questions about these connections to the GAI-Tronics Field Service
Department at 800-492-1212 inside the USA or 610-777-1374 outside the USA. Other connections on
the Speaker Amp/Power Supply PCBA provide quick connect/disconnect of subassemblies.
Connector J2 on the bottom of the Speaker Amp/Power Supply PCBA connects to optional devices such
as the SmartSeries
®
RTU installed in specially designed enclosures.
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751-901
SmartSeries
Installation
®
Speaker Amplifier PAGE 5 of 11
Pub. 42004-659L2F
CAUTION
Do not install this equipment in hazardous areas other than those indicated
on the approval listing in the “Specifications” section of this manual. Such installation may cause a
safety hazard and consequent injury or property damage.
®
The SmartSeries
enclosure. It also plugs into standard SmartSeries
751-901 Speaker Amplifier plugs directly into any standard GAI-Tronics 700 Series
®
enclosures such as a SmartSeries® station RTU
enclosure or an enclosure that houses a party line EOL Module. Use extra care not to damage the
protruding latch wings of connector J2 located on the bottom edge of the amplifier during installation.
When installing the assembly in one of these enclosures, you must also connect the 10-conductor keyed
ribbon cable to J2 on the bottom of the Speaker Amp/Power Supply PCBA. Be sure that the red line on
the edge of the cable lines up with J2-pin 1.
Ensure that the connectors mate securely and then tighten the four screws in the corners of the front panel.
Operation
The 751-901 SmartSeries® Speaker Amplifier amplifies incoming pages, provides speaker supervision,
and supports other optional features listed below.
Optional Features
The following features are available as options to the standard configuration of a station used in an
ADVANCE system and installed in a standard SmartSeries
®
or a custom enclosure. These features can
be configured. Contact the GAI-Tronics Field Service Department at 800-492-1212 inside the USA or
610-777-1374 outside the USA for further information about these features.
The Selected Page Destination feature allows the manual selection of one of four page destinations.
The Supervised Input feature allows the monitoring and supervision of one or two initiating device
circuits (IDCs), initiating an alarm when the supervised device is activated.
The Power Relay Module provides a relay contact output, typically to switch power to a visual
signaling device, for directed or relay group operation. Supervision of the controlled device’s cable
can also be enabled.
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751-901
SmartSeries
®
Speaker Amplifier PAGE 6 of 11
Maintenance
Regular inspection and a good preventive maintenance program will increase the reliability of your
GAI-Tronics station. The GAI-Tronics Field Service Department can formulate a service contract suited
to your facility’s specific need for preventive maintenance.
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 the return authorization number and a
purchase order number. If the equipment is under warranty, repairs will be made without charge. Please
include a written explanation of all defects to assist our technicians in their troubleshooting efforts. Call
800-492-1212 for help in identifying the Regional Service Center closest to you.
WARNING
Before performing any of the following preventive maintenance steps, remove
all power from the station.
1. Inspect and replace frayed or cracked wiring.
2. Secure/replace loose wires and spade terminals.
3. Remove corrosion from terminals.
There are three replaceable fuse s (F1, F2, and F3) mounted on the Speaker Amp/Power Supply PCBA.
Refer to Figure 2.
Fuse F1 protects the low voltage power supply circuits. Replace with GAI-Tronics Part No.
51801-027.
Fuse F2 protects the current to the speaker amplifier. Replace with GAI-Tronics Part No. 51801-003.
Fuse F3 limits the amount of current to any external device connected to J2. Replace with
GAI-Tronics Part No. 51801-024.
Adjustments
The User Adjustment Control is located beneath the GAI-Tronics nameplate on the front panel. Refer to
Figure 1. It is used to make all user adjustments normally required for installation. Loosen the two
screws on the GAI-Tronics nameplate and rotate it counterclockwise to access the adjustment hole. Make
adjustments by inserting a 1/8-inch flat blade screwdriver through the access hole and into the
potentiometer located directly behind the hole.
The User Adjustment Control potentiometer can be used to make three separate adjustments:
Minimum speaker amplifier output level setting
Offset amplifier level (difference between the ambient noise and the amplif ier output lev els )
VLC (volume level control) adjustment (sets a preset speaker level to override the normal volume
control setting).
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751-901
Minimum Level Adjustment
SmartSeries
®
Speaker Amplifier PAGE 7 of 11
Pub. 42004-659L2F
To set the minimum amplif ier outp ut level, insert the 1/8-inch flat blade screwdriver into the User
Adjustment Control and set it fully counterclockwise
. Listen for a single beep from the speaker
indicating the speaker amplifier is in the Minimum Level Adjustment mode. A continuous tone should be
heard after the beep tone. (See note below).
This test tone is used as a reference to adjust the speaker amplifier output level to the desired volume.
Turn the adjustment pot clockwise for the desired output. The test tone automatically shuts off 5 seconds
after the last adjustment. The factory default setting for minimum level is 4.0 watts nominal.
OTE: If the page line is in use immediately after the beep tone, the page signal should be used to make
N
the minimum level adjustment. If the page line is inactive following the beep tone, a continuous tone is
activated to make the minimum level adjustment. After the tone is activated, all page line activity is
ignored until completion of the adjustment.
Offset Level Adjustment
The Offset Level allows the output of the SmartVolume™ speaker amplifier to maintain a set difference
or “offset” between the ambient noise lev el and the sp eak er ou tput lev el. Turn th e User Adjus tment
Control fully clockwise
and listen for the two beep tones indicating that the station is in the Offset
Adjustment mode. A continuous tone should be heard from the station speaker. Turn the adjustment pot
counterclockwise to the desired output lev el.
OTE: If the page line is in use immediately after the two beep tones are heard, the page signal should be
N
used to make the offset level adjustment. If the page line is inactive immediately following the beep
tones, a continuous tone is activated to make the minimum level adjustment. After the tone is activated,
all page line activity is ignored until completion of the adjustment
VLC Level Ad justment
When activated, the VLC overrides the normal volume control setting allowing the amplifier level to
change to a preset level during an emergency page. The factory default setting for the VLC Level is 10%
of maximum power (nominally 1.2 watts).
OTE: The system must be equipped with a SmartSeries
N
®
MCU (Master Control Un it) to activ ate the
VLC function.
To adjust the VLC Level:
1. Force the station into the VLC mode by having someone execute a page from a station programmed
by the MCU to activate the VLC function.
2. During the page, turn the User Adjustment Control fully counterclockwise
, and listen for two beep
tones through the page speaker indicating the VLC Adjustment mode has been activated.
3. After the two beep tones, turn the User Adjustment Control to the desired speaker level using the live
paging signal to adjust the level. The station automatically exits the VLC Adjustment mode and
reverts to normal operation 5 seconds after the last pot adjustment.
Internal Adjustments
There are no internal adjustments that are recommended to be made by the customer.
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751-901
SmartSeries
®
Speaker Amplifier PAGE 8 of 11
Troubleshooting
The following table lists some hints to aid technicians in troubleshooting.
Problem Possible Solution
Pub. 42004-659L2F
Any problem with
station performance
Speaker volume needs
adjustment
Remove the assembly from the enclosure and examine it carefully for obvious
faults such as unconnected plugs, loose connections where the wires connect
to the FSK/P PCBA, and so on. Determine whether the fault is in the
assembly, or in the system, by plugging in a known good spare assembly (set
to the same address as the assembly removed). If the fault is in the assembly,
remove it for repair.
OTE: When replacing the assembly, perform the following steps:
N
1. Set the address on the new assembly to 0, 3.
2. Plug the assembly into the enclosure.
3. After about 10 seconds, remove the assembly. The station is now set up
to request a download of configuration variables from the MCU.
4. Set the unit to the correct address. Set the address to 0, 4 for standard
dumb station operation or consult the ADVANCE system manual for
address assignment information.
5. Plug the assembly back into the enclosure. The station initiates a
configuration download request (ADVANCE systems only). The time
required to complete the download depends upon system configuration
and system activity, but several seconds is typical.
Use the USER ADJ control to adjust the Minimum Level, Offset Level, or
VLC Level (as appropriate). Refer to the “Adjustments” section on page 6.
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751-901
SmartSeries
®
Speaker Amplifier PAGE 9 of 11
How to Diagnose Assembly F aults
When the assembly is in an ADVANCE system that includes a vacuum fluorescent display (VFD), faults
may be automatically detected, transmitted to the MCU in data messages, and displayed or printed. Fault
messages and possible solutions for their causes are described in the table below.
Fault Message Cause and Effect Possible Solution
Watch-Dog timer
Processor has Reset
xd times
(Where x is the
decimal number of
times the watchdog
timer has reset the
processor.)
Supervised Audio
Path
Page Amp
Supervised Audio
Path
Speaker Voice Coil
Cause—The watchdog timer has forced the
processor to reset. This occurs when the reset
pins (J2) on the FSK/P PCBA are temporarily
shorted or when the watchdog timer does not
receive regular status pulses from U4 on the
FSK/P PCBA.
Effect—The processor maintains a count of the
number of resets. If the station is powered
down, the count restarts at zero. The station
still amplifies incoming pages. For the fourth
and subsequent resets, the count is zero.
Cause—The station failed its internal speaker
amplifier health check.
Effect—The station disables the speaker
amplifier health-check function after the first
failure.
Cause—The station is detecting no ambient
noise at the speaker or is detecting an ambient
noise lower than the configured failure
threshold. This may occur if there is a fault in
the speaker wire or a fault at the voice coil.
This also may occur if the ambient noise at the
speaker is too low, as is the case in a quiet
room.
Effect—The station continues measuring
speaker ambient noise. When acceptable noise
levels are subsequently m easured, a restore
message is sent to the MCU.
Verify that the reset
pins 2 and 3 (J2) on the
FSK/P PCBA are not
shorted.
Replace the FSK/P
PCBA.
Replace the Speaker
Amp/Power Supply
PCBA.
Replace FSK/P PCBA
Verify that the speaker
wire is connected and
intact.
Verify that the voice
coil is connected and
intact.
Replace the Speaker
Amp/Power Supply
PCBA.
Replace FSK/P
PCBA.
Polled device Cause—This message is output by the MCU
when it loses communication with the station.
This may occur if there is a fault in the page
line, if the station is powered-down, or if there
is some fatal malfunction within the station.
Effect—The MCU continues to attempt
communication with the station. When
communication is resumed, a restore message is
sent to the MCU.
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Verify that the page line
is connected and intact.
Verify that the station is
installed correctly.
Replace the FSK/P
PCBA.
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751-901
SmartSeries
Fault Message Cause and Effect Possible Solution
®
Speaker Amplifier PAGE 10 of 11
Pub. 42004-659L2F
Polled End-of-line
device
Cause—This message is the same as the
“Polled device” fault, except th at the affec ted
station has been defined as an end-of-line
station in the MCU configuration.
Effect—When this fault occurs, the red EOL
FLT LED on the PPI bezel lights. When
communication is resumed, the LED
Verify that the page line
is connected and intact.
Verify that the station is
installed correctly.
Replace the station
assembly.
extinguishes and a restore message is sent to the
MCU.
Specification s
Electrical
Supply voltage .......................................................................... 90–140 V ac (120 V ac nominal), 50/60 Hz
Power consumed @ nominal ac ........... Zero/maximum signal (12 watts): 15 VA, 9 watts/59 VA, 32 watts
Speaker Amplifier
Output ............................................................................... 12 watts minimum, with nominal supply voltage
Frequency response .......................................................................... 350–6,500 Hz, +0/−3 dB, ref. to 1 kHz
Distortion ......................................................................................... 1% maximum THD @ 1 kHz, 12 watts
SmartVolume™
Monitor range (low gain) ...................................................................................................... 62–100 dB SPL
Offset (above ambient) user level adjustment ................................................................................... 0–48 dB
Minimum user level adjustment .................................................................................... Off; 85–125 dB SPL
Mechanical
Dimensions ....................................... 8.12 H 8.12 W 3.12 D inches (206.0 206.0 78.7 mm) overall
Package weight ..................................................................................................................... 6.1 lbs. (2.8 kg)
Net weight ............................................................................................................................. 5.1 lbs. (2.3 kg)
Environmental
Temperature range ......................................... −22° F to +158° F (−30° C to +70° C) operating and storage
Humidity ..................................................................................................................... 95%, non-condensing
Approvals
NRTL Listed USA and Canada .............................................................. Class I, Div. 2, Groups A, B, C, D
when used with a listed GAI-Tronics 702 or 703 Series enclosure
Class I, Div. 2, Groups A, B, C, D;
Class II, Div. 2, Groups F, G; Class III, Div. 2
when used with a listed GAI-Tronics 732, 733, 7325, 7335, or 758 Series enclosure
Temperature code ....................................................................................................................................... T4
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751-901
SmartSeries
®
Speaker Amplifier PAGE 11 of 11
Pub. 42004-659L2F
Replacement Parts
Part No. Description
12508-002 Amplifier Enclosure Mounting Hardware
12523-001 GAI-Tronics Nameplate Kit
69383-002
FSK/P PCBA
69382-001 Speaker Amp/Power Supply PCBA
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Page 13
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
re-perform 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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