Hubbell GAI-Tronics 751-001ICS User manual

Pub. 42004-730D
G A I - T R O N I C S ®
A H U B B E L L C O M P A N Y
Industrial Communications System
Page/Party® AC Plug-in Amplifiers
TA B L E O F CO N T E N T S
GAI-TRONICS 3030 KUTZTOWN RD. READING, PA 19605 USA
610-777-1374 ◼800-492-1212 ◼Fax: [phone]
VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Confidentiality Notice.....................................................................................................................1
General Information.......................................................................................................................1
Product Overview ...................................................................................................................................1
Features....................................................................................................................................................2
Important Safety Instructions.........................................................................................................2
Installation ......................................................................................................................................3
Install the ICS Page/Party Plug-in Amplifier.......................................................................................3
Enclosure RTU Connection (if applicable)...........................................................................................3
Configuration..................................................................................................................................4
Open and Close the Amplifier ...............................................................................................................4
Models 751-001ICS, 701-302ICS & 701-304ICS..................................................................................4
Speaker Configuration and Adjustment................................................................................................4
Speaker Volume................................................................................................................................5
Speaker Mute....................................................................................................................................5
Speaker Gain.....................................................................................................................................6
Handset Levels (Models 701-302ICS & 701-304ICS Only)................................................................6
Transmit Level..................................................................................................................................6
Receiver Volume ..............................................................................................................................6
Models 701-302ICSVC, 701-304ICSVC, and 751-001ICSVC,............................................................6
Speaker Configuration and Adjustment................................................................................................8
Speaker Volume................................................................................................................................8
Speaker Mute....................................................................................................................................8
Speaker Gain.....................................................................................................................................8
Handset Levels (Models 701-302ICSVC & 701-304ICSVC Only).....................................................8
Transmit Level..................................................................................................................................8
Receiver Volume ..............................................................................................................................9
Audio Alignment ..............................................................................................................................9
Page Disable Control ........................................................................................................................9
Remote Output Switching (Available with RTU Only)....................................................................9
Models 701-902ICS, 701-904ICS, 723-901ICS, and 751-901ICS......................................................10
Set the Address................................................................................................................................... 12
Level Adjustments..............................................................................................................................12

Table of Contents Pub. 42004-730D
GAI-TRONICS 3030 KUTZTOWN RD. READING, PA 19605 USA
610-777-1374 ◼800-492-1212 ◼Fax: [phone]
VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Speaker Mute..................................................................................................................................12
Speaker Gain...................................................................................................................................12
Transmit Level................................................................................................................................13
Receiver Volume ............................................................................................................................13
ALS Minimum Level......................................................................................................................13
ALS Offset Level............................................................................................................................ 13
SmartSeries VLC Level..................................................................................................................14
FSK Signal Gain.............................................................................................................................14
Operation.......................................................................................................................................14
Paging with ADVANCE Head End.....................................................................................................15
Paging without ADVANCE Head End................................................................................................15
Station Time-out Features....................................................................................................................15
Troubleshooting............................................................................................................................15
Specifications ................................................................................................................................18
Power Requirements.............................................................................................................................18
Handset..................................................................................................................................................18
Handset Amplifiers...............................................................................................................................18
Speaker Amplifiers ...............................................................................................................................18
VLC Specifications................................................................................................................................19
RTU Specifications................................................................................................................................19
Mechanical.............................................................................................................................................19
Approvals.......................................................................................................................................20

Pub. 42004-730D
GAI-TRONICS®
A HUBBELL COMPANY
Industrial Communications System
Page/Party®AC Plug-in Amplifiers
GAI-TRONICS 3030 KUTZTOWN RD. READING, PA 19605 USA
610-777-1374  800-492-1212  Fax: [phone]
VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Confidentiality Notice
This installation, operation, and maintenance manual contains sensitive business and technical
information that is confidential and proprietary to GAI-Tronics. GAI-Tronics retains all intellectual
property and other rights in or to the information contained herein. Use this information only in
connection with the operation of your GAI-Tronics product or system. Do not disclose this manual in any
form, in whole or in part, directly or indirectly, to any third party.
General Information
Product Overview
The GAI-Tronics ICS Page/Party system is a
modular industrial communications system
with two to hundreds of stations, all wired in
parallel.
GAI-Tronics’ ICS Page/Party plug-in amplifier
is a key component in the 700 series Page/Party
system. The handset/speaker amplifier mates
directly with the 702, 703, 732, and 733 series
amplifier enclosures and is suitable for indoor
or outdoor use.
This manual covers the ICS Page/Party ac plug-
in amplifiers that are direct replacements for
existing 700 series ac amplifiers. Refer to the
model chart below (see Table 1).
Figure 1. Model 701-304ICS Handset/Speaker
Amplifier

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Table 1. AC Amplifier Model Chart
ICS Page/Party
Model
Description
Replacement for
700 Series:
751-001ICS
Speaker Amplifier
751-001
701-302ICS
Handset/Speaker Amplifier
701-302
701-304ICS
Handset/Speaker Amplifier with Auxiliary Jack
701-304
751-001ICSVC
Speaker Amplifier with VLC
751-001VC
701-302ICSVC
Handset/Speaker Amplifier with VLC
701-302VC
701-304ICSVC
Handset/Speaker Amplifier with Auxiliary Jack and
VLC
701-304VC
751-901ICS
SmartSeries Speaker Amplifier
751-901
701-902ICS
SmartSeries Handset/Speaker Amplifier
701-902
701-904ICS
SmartSeries Handset/Speaker Amplifier with
Auxiliary Jack
701-904
723-901ICS
SmartSeries Remote Handset/Speaker Amplifier
723-901
Features
•direct replacement for existing GAI-Tronics 700 Series plug-in amplifiers
•suitable for indoor or outdoor use
•single party or multi-party operation, (enclosure dependent)
•speaker volume adjustment
•line adjustment
•receiver volume adjustment
•conformal PCBA coating available
•Hytrel®or PVC coil cord available for handset models
Important Safety Instructions
•Read, follow, and retain instructions—Read and follow all safety and operating instructions before
installing or operating the unit. Retain instructions for future reference.
•Heed warnings—Adhere to all warnings on the unit and in the operating instructions.
•Attachments—Do not use attachments not recommended by the product manufacturer, as they may
cause hazards.
•Servicing—Do not service this unit yourself. Opening or removing covers may expose dangerous
voltage or other hazards. Refer all servicing to qualified service personnel.
•This permanently connected apparatus must have a UL listed 15-amp circuit breaker incorporated in
the electrical installation of the building.
USA and Canada—Consult the National Electrical Code (NFPA 70), Canadian Standards Association
(CSA 22.1), and local codes for specific requirements regarding your installation. Install class 2 circuit
wiring in accordance with the NEC.

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Installation
CAUTI ON —Do not install this equipment in hazardous areas other than those listed in the
Approvals
section. Such installation may cause a safety hazard and consequent injury or property damage.
ICS Page/Party ac plug-in amplifiers plug directly into the enclosure (see Figure 2). Use extra caution to
prevent damage to the protruding latch wings of connector P6, located on the top right edge of the
amplifier, during installation and removal.
Install the ICS Page/Party Plug-in Amplifier
1. Plug the amplifier directly into the enclosure.
2. Attach the amplifier to the enclosure with the provided hardware (see Figure 2).
3. Apply power to the station.
Figure 2. Installation Detail
Enclosure RTU Connection (if applicable)
RTU enclosures provide one double-pole form C relay and one fuse-protected contact. The RTU PCBA
includes a ribbon cable that connects to the VLC or SmartSeries PCBA. If an RTU PCBA is present in
the enclosure, connect the ribbon cable to the receptacle on the top side of the amplifier.
NOTE: When a SmartSeries PCBA has an ADVANCE head end connection, the RTU provides input
status monitoring (to trigger action in the ADVANCE head end), a double-pole form C relay
output contact (with optional output cable supervision), and one fuse-protected contact.

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Configuration
Settings and adjustments vary by model number. Refer to the appropriate section in this manual for
instructions for the applicable model.
Open and Close the Amplifier (All models)
Open the amplifier to gain access to the internal PCBAs, when necessary. Open and close the amplifier as
follows:
1. Place the amplifier on a flat surface and loosen (do not remove) the two sets of rear cover screws,
located on the top and bottom L-shaped slots (see Figure 6, Figure 10, and Figure 14)).
2. Slide the front panel, with the screws, sideways and then pull up to separate the front panel from the
rear section.
A ribbon cable connects the two sections.
3. Lay the rear section to the left and the front section to the right with the PCBAs facing upward for
access to the applicable adjustments.
4. After completing all settings and adjustments, slide the rear cover L-shaped slots over the top and
bottom screws and tighten the screws.
Do not pinch any cables.
Models 751-001ICS, 701-302ICS & 701-304ICS (ICS Page/Party ac plug-in
amplifiers).
Speaker Configuration and Adjustment
GAI-Tronics recommends using a No. 10440-002 Maintenance Cable (purchased separately) to perform
the following adjustments (see Figure 6 for component locations).
Figure 3. Model 751-001ICS
Speaker Amplifier
Figure 4. Model 701-302ICS
Handset/Speaker Amplifier
Figure 5. Model 701-304ICS
Handset/Speaker Amplifier with
Auxiliary Jack

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Figure 6. ICS Page/Party Amplifier—Open for Settings and Adjustments
Speaker Volume
Use the speaker volume potentiometer, R91, to adjust the signal level to the speaker from the page line.
• There is no need to open the amplifier to make this adjustment.
• The adjustment is accessible through a small hole in the bottom of the amplifier.
• The default setting is 4 watts for an 8-ohm speaker and 2 watts for a 16-ohm speaker.
WARNING —Maximum output power may exceed rated speaker wattage resulting in speaker
damage.
Speaker Mute
The amplifier can mute its connected speaker during page operation to eliminate feedback. To mute the
connected speaker:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
• Jumper P11 in the EN position (default), on the main PCBA, mutes the speaker during page
activation.
• Jumper P11 in the DIS position broadcasts to the speaker during paging.

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SpeakerGain
Jumper P9,on the main PCBA, limits the maximum speaker output level. To change the speaker gain:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
•Jumper P9,in the 30W position (default), represents a 30-watt maximum output.
•Jumper P9 in the 2W position, represents a 2-watt maximum output.
WARNING
—maximum output power may exceed rated speaker wattage resulting in speaker
damage.
Handset Levels (Models 701-302ICS & 701-304ICS Only) (see Figure 6).
Transmit Level
To adjust the signal level from the handset to the page or party lines:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
3. Adjust the LINE ADJ potentiometer, R34, on the main PCBA, to change the transmit level.
ReceiverVolume
To adjust the receiver volume:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
3. The receiver volume potentiometer, R5,on the main PCBA, adjusts the signal level to the handset
receiver from the page or party lines.
NOTE:The receiver volume potentiometer, R5, does not adjust the signal level to the Model 701-
304ICS auxiliary headset.
Models 701-302ICSVC, 701-304ICSVC, and 751-001ICSVC, (ICS
Page/Party ac plug-in amplifiers with VLC)
The VLC (volume level control) PCBA allows the amplifier to remotely control the local speaker volume
level. A remote device transmits a 50 kHz signal over the page line to activate VLC. The station detects
the 50 kHz signal and switches to an alternate speaker volume setting.
VLC provides an alternate speaker volume setting; activated by receiving a 50-kHz signal on the page
line. Examples of its use are muting office or crew quarter’s speakers until a high priority message or
alarm broadcasts and/or reducing outdoor speaker volume at night. VLC can prevent local handset paging
during emergency conditions, and can also provide a relay output, which requires an RTU configuration.

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Figure 10. ICSVC Amplifier—Open for Settings and Adjustments
Figure 7. Model 751-001ICSVC
Speaker Amplifier
Figure 8. Model 701-302ICSVC
Handset/Speaker Amplifier
Figure 9. Model 701-304ICSVC
Handset/Speaker Amplifier with
Auxiliary Jack

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Speaker Configuration and Adjustment
GAI-Tronics recommends using a No. 10440-002 Maintenance Cable (purchased separately) to perform
the following adjustments (see Figure 10 for locations).
Speaker Volume
The speaker volume potentiometer, R91, adjusts the signal level to the speaker from the page line.
•There is no need to open the amplifier to make this adjustment.
•The adjustment is accessible through a small hole in the bottom of the amplifier.
•The default setting is 4 watts for an 8-ohm speaker and 2 watts for a 16-ohm speaker.
WARNING
—Maximum output power may exceed rated speaker wattage resulting in speaker
damage.
SpeakerMute
The amplifier can mute its connected speaker during page operation to eliminate feedback. To mute the
connected speaker:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
•Jumper P11, in the EN position (default), on the main PCBA, mutes the speaker during page
activation.
•Jumper P11, in the DIS position, broadcasts to the speaker during paging.
SpeakerGain
Jumper P9,on the main PCBA, limits the maximum speaker output level. To change the speaker gain:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
•Jumper P9,in the 30W position (default), represents a 30-watt maximum output.
•Jumper P9,in the 2W position, represents a 2-watt maximum output.
WARNING
—Maximum output power may exceed rated speaker wattage resulting in speaker
damage.
Handset Levels (Models 701-302ICSVC & 701-304ICSVC Only)
GAI-Tronics recommends using a No. 10440-002 Maintenance Cable (purchased separately) to perform
the following adjustments (see Figure 10 for component locations).
Transmit Level
To adjust the signal level from the handset to the page or party lines:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
3. Adjust the LINE ADJ potentiometer, R34, on the main PCBA, to change the transmit level.

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ReceiverVolume
To adjust the receiver volume:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
3. The receiver volume potentiometer, R5,on the main PCBA, adjusts the signal level to the handset
receiver from the page or party lines.
NOTE:The receiver volume potentiometer, R5, does not adjust the signal level to the Model 701-
304ICSVC auxiliary headset.
AudioAlignment
Set the normal speaker output level using a small screwdriver to make the adjustments through the access
hole, on the bottom of the amplifier (see Figure 10):
1. Set DIP switch SW2-1 to the off position.
2. Set DIP switch SW2-2 to the on position to enable a reference test tone.
3. Adjust the speaker volume potentiometer, R91, on the main PCBA, to the desired audio level (see
Figure 10).
4. Turn the speaker volume potentiometer, R91, fully counterclockwise to mute the audio.
NOTE:The station will not allow the adjustment if LED2 on the VLC PCBA is on; indicating the system
VLC tone is present.
To set the VLC controlled speaker output level (see Figure 10):
1. Set SW2-1 to the on position.
2. Set SW2-2 to the on position to enable a reference test tone.
3. Adjust the VLC volume level potentiometer, R12, (on the VLC PCBA) to the desired audio level.
4. Turn the VLC volume level potentiometer, R12, fully counterclockwise to mute the audio.
5. Set SW2-1 and SW2-2 to the off position to return to normal system operation.
Page DisableControl
Set SW2-3 (see Figure 10) to the on position to disable local paging when the system VLC tone is
present.
RemoteOutputSwitching(AvailablewithRTUOnly)
Set SW2-4 (see Figure 10) to the on position to activate the RTU relay when the system VLC tone is
present.

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Models 701-902ICS, 701-904ICS, 723-901ICS, and 751-901ICS (ICS
SmartSeries ac plug-in amplifiers)
The SmartSeries PCBA adds microprocessor control to the Page/Party station, providing additional sensor
and monitoring capabilities, such as:
• ALS (ambient level sensing) circuitry that changes the local speaker’s paging volume in response to
varying background noise.
• Off-hook timeout—prevents the introduction of noise on a party line by electronically placing the
handset on-hook after eight minutes,
• Page timeout—limits a single page broadcast to two minutes, freeing the page line for emergencies.
When used with ADVANCE head-end equipment, the amplifier monitors key components (including the
handset, amplifier, and local speaker). This provides fast notification of any station faults. In addition, it
accepts supervised contact closure inputs and provides a supervised relay output (requires RTU option).
Figure 11. Model 723-901ICS
SmartSeries Remote and 751-
901ICS SmartSeries Speaker
Amplifier
Figure 12. Model 701-902ICS
SmartSeries Handset/Speaker
Amplifier
Figure 13. Model 701-904ICS
SmartSeries Handset/Speaker
Amplifier with Auxiliary Jack

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Figure 14. SmartSeries Amplifier—Open for Settings and Adjustments
Figure 15. SmartSeries Remote Amplifier—Open for Settings and Adjustments

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Set the Address
Assign SmartSeries stations in ADVANCE systems a unique address using the hexadecimal switches, S1
(Hi Address) and S2 (Lo Address), for the SmartSeries option to function properly.
•Each switch contains 16 settings, labeled 0–F. A small arrow on each switch indicates the setting.
•The station address is the high address setting followed by the low address setting.
For example, to assign an address of 05, the high station address switch, S1, is set to 0 and the low
address switch, S2, is set to 5.
•Valid address settings are 05 to FE.
•Access the address settings through holes in the bottom of the ICS SmartSeries amplifier.
•Record the address assigned to each station in the system.
•When replacing an amplifier: Note the address of the existing amplifier and use the same address for
the replacement amplifier.
•In a system without an ADVANCE head end: Set the SmartSeries station address to 04 (default).
Level Adjustments
GAI-Tronics recommends using a No. 10440-002 Maintenance Cable (purchased separately) to perform
the following adjustments (see Figure 14 for component locations).
SpeakerMute
The amplifier can mute the associated speaker during page operation to eliminate feedback. To mute the
associated speaker:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier as previously described.
•P11 on the Main PCBA mutes the speaker during page activation when in the EN position
(default).
•P11 in the DIS position allows broadcast to the speaker during paging.
SpeakerGain
Jumper P9,on the main PCBA, limits the maximum speaker output level. To change the speaker gain:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
•Jumper P9,in the 30W position (default), represents a 30-watt maximum output.
•Jumper P9,in the 2W position, represents a 2-watt maximum output.
WARNING
—Maximum output power may exceed rated speaker wattage resulting in speaker
damage.
NOTE:Transmit level and receiver volume settings are for Models 701-902ICS and 701-904ICS only.

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Transmit Level
To adjust the signal level from the handset to the page or party lines:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
3. Adjust the LINE ADJ potentiometer, R34, on the main PCBA, to change the transmit level.
ReceiverVolume
To adjust the receiver volume:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Open the amplifier (see the Open and Close the Amplifier section).
3. The receiver volume potentiometer, R5,on the main PCBA, adjusts the signal level to the handset
receiver from the page or party lines.
NOTE:It does not adjust the signal level to the Model 701-904ICS auxiliary headset.
ALSMinimumLevel
The ALS minimum level is the lowest speaker output level that the station will maintain. The factory
default setting for minimum level is 4.0 watts nominal into an 8-ohm load. To set the ALS minimum
level:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Connect the No. 10440-002 Maintenance Cable (purchased separately).
3. Turn the speaker volume potentiometer, R91, on the main PCBA, fully counterclockwise (see Figure
14).
4. Listen for a single beep from the speaker, indicating the speaker amplifier is in the minimum level
adjustment mode.
If the page line is in use immediately after hearing the beep tone: Use the page signal as the reference
to adjust the speaker volume minimum level.
If the page line is inactive following the beep tone: A continuous tone activates to make the minimum
level adjustment. Once the tone activates, the amplifier ignores all page line activity until completion
of the adjustment.
5. Use the test tone as a reference to adjust the speaker volume potentiometer, R91, to the desired
output.
The test tone automatically shuts off 5 seconds after the last adjustment.
ALSOffset Level
The ALS offset level allows the output of the speaker amplifier to maintain a set difference or offset
between the ambient noise level and the speaker output level. To set the ALS offset level:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Connect the No. 10440-002 Maintenance Cable (purchased separately).
3. Turn the speaker volume potentiometer, R91, (on the main PCBA) fully clockwise (see Figure 14).
4. Listen for two beep tones, indicating the amplifier is in the offset adjustment mode.

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If the page line is in use immediately after hearing the two beep tones: use the page signal to make
the offset level adjustment.
If the page line is inactive immediately following the beep tones: a continuous tone activates to make
the offset level adjustment. Once the tone activates, the amplifier ignores all page line activity until
completion of the adjustment.
5. Adjust the speaker volume potentiometer, R91, to the desired offset level.
NOTE:Make this adjustment under maximum ambient noise level conditions. Always set the ALS offset
level higher than the ALS minimum level setting.
SmartSeries VLC Level
When activated, the VLC overrides the ALS minimum level setting allowing the speaker volume to
change to a preset level during an emergency page. To adjust the VLC Level:
1. Remove the amplifier from the enclosure and place it on a stable surface.
2. Connect the No. 10440-002 Maintenance Cable (purchased separately).
3. Force the station into the VLC mode by executing a page from a station programmed by the MCU to
activate the VLC function.
4. During the page, turn the speaker volume potentiometer, R91, fully counterclockwise (see Figure 14).
5. Listen for two beep tones through the page speaker, indicating the amplifier is in the VLC adjustment
mode.
6. After hearing the two beep tones, turn the speaker volume potentiometer, R91, 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 five seconds
after the last potentiometer adjustment.
NOTE:The system must have an ADVANCE head end to activate the VLC function.
FSKSignalGain
The FSK signal gain potentiometer, R13, on the SmartSeries PCBA, adjusts the FSK transmit signal
strength. This setting is set at the factory. Do NOT adjust this setting.
Operation
After installing the ICS Page/Party plug-in amplifier in the appropriate 702, 703, 732 or 733 series
enclosure, Single party operation is as follows (multi-party operation in parentheses).
NOTE:Use the Model 10401-201 Headset and 10416-103 Extension Cord (purchased separately) at ICS
plug-in amplifiers, with an auxiliary jack, to be hands-free and mobile while maintaining
communication. Connecting a headset disables the handset microphone.
For paging and subsequent party line conversation:
1. Lift the handset or connect a headset. (Select a free party line using the five-position rotary switch.)
2. Press the handset pressbar or headset switch
3. Page the desired individual (indicate the selected party line)
4. Release the pressbar or headset switch.

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To reply:
1. The paged individual (selects the party line and) lifts the handset or plugs in a headset.
Full-duplex communication takes place on the party line. The system does not broadcast party line
conversations over the speakers.
2. After the conversation is complete, all parties place their handsets back on-hook/disconnect headsets.
NOTE:The ICS Page/Party station incorporates a noise-canceling microphone to reduce transmitted
ambient noise. This requires the user to place the microphone as close as possible to their mouth.
Paging with ADVANCE Head End (SmartSeries®Amplifiers)
Paging and party line operation with the ICS SmartSeries option is the same as standard station operation
with the following differences:
•The operator hears a steady page-confirmation tone in the handset/headset earpiece when they press
the handset pressbar or the headset page switch.
•A page pre-announcement tone, if programmed, will sound when the page-confirmation tone ends,
and the operator can make a page.
•Hearing a busy tone in the handset/headset earpiece indicates the system is busy and it rejects the
page.
Paging without ADVANCE Head End
Paging and party line operation is the same as standard station operation.
Station Time-out Features
The ICS SmartSeries option supports a page-duration limit that sets the maximum duration of each page.
•Reaching the page-duration limit terminates the page.
•The page-duration limit is fixed at 2 minutes when used without an ADVANCE head end.
The ICS SmartSeries option supports an off-hook limit that sets the maximum off-hook duration for the
station.
•Reaching the limit places the station electrically on hook.
•Momentarily place the handset on-hook to reset the timeout condition.
•The off-hook limit is 8 minutes when an ADVANCE head end is not present.
Troubleshooting
The following tables provide aid to qualified service personnel in troubleshooting problems with the ICS
Page/Party replacement amplifiers.

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Table 2. Troubleshooting for All Models (Except as Noted)
Problem
Potential Cause
Station not
functional
•Verify incoming supply voltage at TB2 or TB3 on the termination PCBA.
•Verify regulated 24 V dc at P1 of termination PCBA. Caution! Supply voltage
present at P2.
Excessive hum or
buzz during station
operation.
Inspect the Page/Party lines for proper line terminations, shorts, and grounds.
Crosstalk occurs
between Page/Party
lines.
•Inspect the Page/Party lines for proper line terminations, shorts, and grounds.
•Inspect the party line connections for crossing of the cable pairs.
Feedback occurs
during page.
•Check location and orientation of speakers in the area.
•Refer to the Speaker Mute section for the applicable model.
Squeal in handset
receiver.
(Not applicable to
speaker amplifier
models.)
•Verify proper termination on Page/Party lines.
•Verify connection of system line balance.
Speaker level is too
low/loud.
•Improperly adjusted speaker volume potentiometer.
•Verify the nominal page line level is correct.
•Replace the speaker or driver.
Cannot make a page
(Not applicable to
speaker amplifier
models.)
•Check handset (or headset) connections.
•Check proper cable terminations between termination and main PCBA.
•Check jumper settings or cable connections at P4.
•Replace handset.
Handset microphone
audio is too
low/loud
(Not applicable to
speaker amplifier
models.)
•Disconnect headset, if connected (auxiliary jack models only).
•Adjust the LINE ADJ on the main PCBA.
•Check jumper settings or cable connections at P4 on the main PCBA.
•Ensure proper termination of Page/Party lines.
•Check handset connections.
•Check proper cable terminations between termination and main PCBAs.
•Check operation of hookswitch.
•Replace handset.
Handset receiver
audio is too
low/loud.
(Not applicable to
speaker amplifier
models.)
•Adjust the receiver volume potentiometer on main PCBA.
•Check jumper settings or cable connections at P4.
•Ensure proper termination of Page/Party lines.
•Check handset connections.
•Check proper cable terminations between termination and main PCBAs.
•Check operation of hookswitch.
•Replace handset.

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Table 3. Additional Troubleshooting
(VLC Models 701-302ICSVC, 701-304ICSVC, 723-901ICS, and 751-001ICSVC)
Problem
Potential Cause
Speaker volume is
too low/loud.
•Refer to the Audio Alignment section for the specific VLC model.
•Ensure the nominal page line level is correct.
Cannot place a page.
Refer to Audio Alignment and Page Disable Control sections for the specific VLC
model.
RTU output is not
functional.
•Refer to Remote Output Switching (Available with RTU Only) section for the
specific VLC model.
•Check fuse F1 on RTU PCBA.
•Check the cable connection at P5 on the RTU and VLC PCBA.
•Check RTU terminal connections on TB7 on the RTU PCBA in the enclosure.
•Check operation of connected device.
RTU input does not
function.
Inputs are only available with SmartSeries models.
Table 4. Additional Troubleshooting
(SmartSeries Models 701-902ICS, 701-904ICS and 751-901ICS)
Problem
Potential Cause
Speaker volume is
too low/loud.
•Refer to the ALS Minimum Level, ALS Offset Level and SmartSeries VLC Level
sections for the specific model.
•Check cable connection at P4.
•Verify the nominal page line level is correct.
Page/Party
operation does not
function.
Refer to the Set the Address section for the specific model.
RTU output is not
functional.
•For supervised output, verify no monitored output faults exist.
•Check fuse F1, on the RTU PCBA.
•Check the cable connection at P5 on the RTU and SmartSeries PCBAs.
•Check the RTU terminal connections on TB6 and TB7 on the RTU PCBA, in the
enclosure.
•Check operation of connected device.
RTU input does not
function.
•For supervised input, ensure no monitored input faults exist.
•Check the cable connection at P5 on the RTU and SmartSeries PCBAs.
•Check RTU terminal connections on TB6 on the RTU PCBA in the enclosure.
•Check operation of connected device.

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Specifications
Power Requirements
ACInput
Input Voltage ............................................................................90 to 140 V ac, 50/60 Hz, 120 V ac nominal
Power Consumed (8-ohm load)
120 V AC
Idle
70 mA/8.4 VA
4-watt output (default setting)
120 mA/14.4 VA
12-watt output
200 mA/24.0 VA
30-watt output
400 mA/48.0 VA
Maximum Current Consumption (8-ohm load)
90 V AC
30-watt output
520 mA/46.5 VA
Handset
Microphone............................................................................................................ dynamic, noise-canceling
Receiver......................................................................................................dynamic, hearing aid compatible
Cord .............................................................................................................retractile, 6-foot extended, PVC
Material................................................................................................................................................... ABS
External control...............................................................................................push-to-page handset pressbar
Handset Amplifiers
Output level (compression controlled)........................................................1.5 V RMS nominal into 33-Ω load
adjustable 0 to 2.1 V RMS
Frequency response................................................................250 to 6,500 Hz, +0/−3 dB reference to 1 kHz
Distortion..........................................................................<1.5% THD @ 1 kHz (below compression level)
Receiver level.................................................................................................................200 mV RMS, nominal
..........................................................................................................................adjustable 150 to 400 mV RMS
Speaker Amplifiers
Maximum output:
8-ohm speaker*...............................................................30 W into 8-Ω load with 1.5 V RMS input page level
adjustable to 30 W; default: 4 W @ 8 Ω
16-ohm speaker.............................................................15 W into 16-Ω load with 1.5 V RMS input page level
adjustable to 15 W; default: 2 W @ 16 Ω
Frequency response................................................................250 to 6,500 Hz, +0/−3 dB reference to 1 kHz
Distortion........................................................................................................... <1% THD @1 kHz to 24 W
<3% THD @ 1 kHz to 30 W
Input impedance............................................................................................................................... 50,000 Ω
16 kΩ with SmartSeries option
Model 751-001ICS only—SmartSeries offset level adjustment range.......................................... 0 to 30 dB
*See Figure 16 on Page 21.