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SB-704
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Clear-Com SB-704 User Manual

CLEAR-COM ENCORE
SB-704 MAIN STATION
INSTRUCTION MANUAL
SB-704 Main Station Instruction Manual
Part Number 810346Z Rev. 3
Legal Disclaimers
Copyright © 2013 HME Clear-Com Ltd.
All Rights Reserved
The product described in this document is distributed under licenses restricting its use, copying, distribution, and decompilation/ reverse engineering. No part of this document may be reproduced in any form by any means without prior written authorization of Clear-Com, an HME Company.
Clear-Com Offices are located in California, USA; Cambridge, UK; Montreal, Canada; and Beijing, China. Specific addresses and contact information can be found on Clear-Com's corporate website:
www.clearcom.com
Clear-Com Contacts
Americas and Asia-Pacific Headquarters
California, United States Tel: +1.510.337.6600 Email: CustomerServicesUS@clearcom.com
Europe, Middle East, and Africa Headquarters
Cambridge, United Kingdom Tel: +44 1223 815000 Email: SalesSupportEMEA@clearcom.com
Canada Office
Quebec , Canada Tel: +1 (450) 653-9669
China Office
Beijing Representative Office Beijing, P.R.China Tel: +8610 65811360 / 65815577
CONTENTS
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
The Clear-Com Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Intercom Power Status Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Selecting Microphones and Enabling the Speaker. . . . . . . . . . . . . . . . 1-4
Listening to Intercom Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Talking on Intercom Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
The All-Talk Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Monitoring Main Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Sending and Receiving Call Signals . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Linking Intercom Channels Together. . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
The Announce Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Channel Assignments Using the Slide Switch Matrix . . . . . . . . . . . . . 1-6
Remote Mic Kill Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Hidden Front Panel Options and Adjustments. . . . . . . . . . . . . . . . . . . . . 1-7
DIP Switch Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Hidden Adjustment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Rear Panel Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Intercom Line Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Short-Circuit and Overload Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Summary of Main Front-Panel Keys, Lights, and Controls. . . . . . . . . . 1-10
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Intercom Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Line Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Using the Link Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Fail-Safe Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Intercom Cable Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Portable Installation Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Permanent Installation Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Ground Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Physical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Description of Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Headset Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Panel Mic Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Intercom Line Connectors (Rear Panel). . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Program Input (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Announce Output (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
IFB/HOT Mic (Rear Panel, 1/4-Inch Phone Jack) . . . . . . . . . . . . . . . . . . 2-8
External Speaker (Rear Panel, 1/4-Inch Phone Jack). . . . . . . . . . . . . . . . 2-8
SB-704 MAIN STATION
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Accessory (Rear Panel, DB-15F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Auxiliary Program Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Remote Mic On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Announce Relay Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Internal Option Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
IFB Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Run/Test Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Program Audio Feed to Announce Output Jumper . . . . . . . . . . . . . . . . 2-10
Power Source Selection for Switchable Intercom Lines . . . . . . . . . . . . 2-11
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SB-704 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 4-1
SB-704 Main Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . 5-I
Warranty Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Non-Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
ii
SB-704 MAIN STATION
Please read and follow
these instructions before
operating this product.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades, with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
15. WARNING: To reduce the risk of fire or electric shock, do not expose this product to rain or moisture.
SB-704 MAIN STATION
Please familiarize yourself with the safety symbols in Figure 1. When you see these symbols on this product, they warn you of the potential danger of electric shock if the main station is used improperly. They also refer you to important operating and maintenance instructions in the manual.
iii
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol alerts you to the presence of uninsulated dangerous voltage within the product's enclosure that might be of sufficient magnitude to constitute a risk of electric shock. Do not open the product's case.
This symbol informs you that important operating and main­tenance instructions are included in the literature accompanying this product.
Figure 1: Safety Symbols
EMC AND SAFETY
The SB-704 station meets all relevant CE, FCC, UL, and CSA specifications set out below:
EN55103-1 Electromagnetic compatibility. Product family standard for audio, video, audio-visual, and entertainment lighting control apparatus for professional use. Part 1: Emissions.
EN55103-2 Electromagnetic compatibility. Product family standard for audio, video, audio-visual, and entertainment lighting control apparatus for professional use. Part 2: Immunity.
UL 60065-7, CAN/CSA-C22.2 No.60065-3, IEC 60065-7 Safety requirements.
And thereby compliance with the requirement of Electromagnetic Compatibility Directive 2004/108/EC and Low Voltage Directive 2006/95/EC
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
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SB-704 MAIN STATION

OPERATION

INTRODUCTION

Congratulations on choosing this Clear-Com product. Clear-Com was established in 1968 and remains the market leader in providing intercoms for entertainment, educational, broadcast and industrial applications. The ruggedness and high build-quality of Clear-Com products defines the industry standard. In fact, many of our original beltpacks and main stations are still in daily use around the world.
We recommend that you read through this manual completely to better understand the functions of the SB-704. If you encounter a situation or have a question that this manual does not address, contact your dealer or call Clear-Com directly. Our applications support and service people are standing by to assist you. (Refer to Chapter 5,“Warranty” for contact information.) Thank you for selecting Clear-Com for your communications needs.

THE CLEAR-COM CONCEPT

Clear-Com is a closed-circuit intercom system that consistently provides high-clarity communication in high-noise and low-noise environments. A basic system consists of a single- or multi-channel power supply or main station connected to various single- or multi-channel remote stations, such as beltpacks and loudspeaker stations.
Clear-Com manufactures a wide variety of both portable and fixed-installation units. All are compatible with each other. Clear-Com intercom systems can also interface with other communication systems and devices.
Clear-Com is a distributed amplifier system; each main and remote station houses its own mic preamplifier, headset or speaker power amplifier, and signaling circuitry. Stations bridge the intercom line at a very high impedance and place a minimum load on the line. The audio level always remains constant, and does not fluctuate as stations leave and join the network. Low-impedance mic input lines and specially designed circuitry make Clear-Com channels virtually immune to RFI and dimmer noise.
Clear-Com stations are interconnected with two-conductor, shielded microphone cable. Portable stations are connected with two conductor cables with 3-pin XLR connectors. One wire carries the DC power from a main station or power supply to all remote stations, and the other wire carries 2-way (duplex) audio information. The shield acts as a common ground. One termination (per channel) is needed throughout the intercom network, and is usually located in the main station or power supply.
SB-704 MAIN STATION
1-1
Clear-Com main stations, power supplies, and certain remote stations each
Off
B
C
D
A
Party
Line
12345678910
Headset
Null
Pgm
Listen
Channel B
Null
Pgm
Listen
ChannelA
Null
Pgm
Listen
Channel C
Null
Pgm
Listen
Channel D
BCDA Line Length
Program Interrupt
BCD
Auto-Talk
/Listen
B
C
D
A
Talk Latch
Disable
B
C
D
A
HS Lim
B
C
D
A
Auto-Call
Speaker
On
Off
Volume
Channel DChannel CChannel BChannel A
Talk
Listen
Call
Talk
Listen
Call
Talk
Listen
Call
Announce
AllTalk
Link On
Mic Select
Panel
Headset
Mic On
Panel Mic
On
(Off)
(Default)
Panel Mic
Gain
Sidetone
Adjust
CH. B
CH.A
CH. C
CH. D
Short
SB-704
Program
Level
Program
On/Off
BCDA
Long
(Short)
Remote
Mic Kill
4 Channel Switchboard Main Station
have an auxiliary program input with its own volume control, which allows an external audio source to be fed to the intercom system.
Visual signal circuitry (call lights), a standard feature on all main and remote stations, allows the user to attract the attention of operators who have removed their headsets.
Figure 1-1: SB-704 Front Panel

DESCRIPTION

The SB-704 main station is a four-channel microprocessor-controlled station intended to work with other Clear-Com party-line products. The SB-704 is designed for applications in which a person needs to communicate with up to four groups of people and be able to quickly assign a remote station to any of the four channels.
The station features a ten-position slide switch matrix that allows assignment of any of the ten intercom lines to any of the four intercom channels, to an isolated separate party line, or to an off position.
The following is a list of features found in the SB-704 intercom station:
• MICROPROCESSOR CONTROL: Most aspects of station operation are under microprocessor control.
• REMOVABLE ACCESS PANEL: A removable front panel allows access to most controls and option DIP switches.
• INDIVIDUAL CHANNEL CONTROLS: Each channel has individual talk, listen, and call push-buttons for each channel.
• MOMENTARY/LATCHING TALK BUTTONS: The talk buttons have a momentary and latching action depending on how the button is used. The latching function can be defeated with DIP switches.
• INDIVIDUAL CHANNEL ADJUSTMENTS: Each channel has individual listen level controls, channel null adjustments, and program feed level controls.
• MULTIPLE PROGRAM INPUTS: Multiple program inputs are provided for local station monitoring and program feed to intercom lines for local talent cuing (IFB).
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SB-704 MAIN STATION
• INTERNAL IFB (IFB - Interrupt Foldback of program feeds): Program feed can be fed to each channel and interrupted (IFB) when a talk function is active or when a call signal is received on that channel. An internal jumper determines whether the IFB function is talk- or call signal- activated.
• ASSIGNMENT MATRIX: Up to ten stations or groups of stations can be assigned to any one of the four intercom lines.
• LINK FUNCTION: The SB-704 has a link function that places all four channels into a common party line at the single push of a button.
• ALL-TALK: An all-talk button allows instant access to all channels.
• ANNOUNCE FUNCTION: An announce button allows external paging. A set of relay contacts is provided to control an external system.
• PROGRAM FEED OVER STAGE ANNOUNCE: An internal jumper allows the main program feed to be fed to the stage announce output. The program is automatically interrupted when the announce button is pressed.
• MIC ON/OFF SWITCH: A separate mic on/off push-button allows turning the microphone off without upsetting the setting of talk switches.
• REMOTE MIC KILL SWITCH: Front-panel switch allows you to turn off all latched talks on remote stations and beltpacks.
• EXTERNAL MIC ON/OFF INPUT: An external logic input allows the mic on/off function to be switched remotely.
• EXTERNAL IFB and HOT MIC OUTPUT: A rear panel jack provides direct connection to Clear-Com’s external IFB system such that the station's microphone can be used in the external IFB system. A buffered unswitched output of the selected microphone is also available.
• EXTERNAL SPEAKER OUTPUT: The SB-704 does not have a panel-mounted speaker; however, the speaker amplifier output is made available on the rear panel.
• SPEAKER ON/OFF SWITCH: The speaker output may be turned on and off with a front panel switch.
• SPEAKER DIMMING: Whenever a talk is active the speaker output is dimmed approximately 6 dB to prevent feedback.
• PANEL MIC GAIN: The preamplifier for the panel microphone has a
gain trim adjustment to allow field trimming. Adjustment of the panel microphone gain also varies the frequency response of the preamplifier to compensate for feedback when the microphone is used up close.
SB-704 MAIN STATION
• POWER SUPPLY WITH SHORT CIRCUIT PROTECTION: The SB-704 features redundant powering to remote stations by
1-3
providing separate short-circuit-protected power sources to each of the four intercom lines. A short on one intercom line will not bring the whole system down. Short-circuit indicators are provided on the front panel for each channel.

NORMAL OPERATION

Once installed and operational, the SB-704 is easy to operate. The following sections describe normal operation of the unit, use of controls available under the access panel, and abnormal operation of the power distribution system.
Normal operation of the SB-704 requires access only to the front-panel controls. The following is a brief description of how to use the front-panel controls in day-to-day operation.
There are option DIP switches and adjustment controls behind the access panel on the lower portion of the front panel. To gain access to the switches and controls, pull on the two latches on either end of the access panel and remove it.
This section discusses the following subjects:
• Intercom power status lights
• Selecting microphones and enabling the speaker
• Listening to intercom channels
• Monitoring main program
• Talking on intercom channels
• The all-talk function
• Sending and receiving call signals
• Linking intercom channels together
• The announce function
• Channel assignments using the slide switch matrix
Intercom Power Status Lights
The four red short lights are failure indicators for each of the four intercom lines. These lights will assist in locating a shorted or overloaded channel. Within as little as ½ second of automatically cutting off power to an overloaded intercom line, the SB-704 will attempt to turn power on again. This allows momentary short or overload conditions to clear automatically. Shorts are normally caused by miswiring or damaged cables. Overloads are generally caused by connecting too many beltpacks and stations to an intercom line.
1-4
Clear-Com’s advanced fail-safe design can sense the difference between a short or an overload to optimally protect itself. Power is restored in as quickly
SB-704 MAIN STATION
as ½ second, depending upon whether there was a single or multiple short or overload. The other channels continue to operate normally. The SB-704’s advanced fail-safe circuit will bring the power back up even under full load conditions. Front-panel lights indicate a fault on any of the four channels. When the station is first turned on, all four short lights are normally off.
Selecting Microphones and Enabling the Speaker
To select between the gooseneck mic and the headset mic, move the microphone select switch to the appropriate position.
The mic on/off pushbutton toggles the microphone on and off. The mic button lights blue when the mic is active.
The microphone will be turned on automatically whenever a talk function is activated as it is assumed that you wish to talk. If one or more talks are active, you may turn the microphone off without unlatching the active talks.
The speaker may be turned on and off with the speaker switch.
Listening to Intercom Channels
To listen to an intercom channel, press the listen button for the desired channel. The listen button lights green to indicate that the listen function is on.
The listen level control (below the call button) for that channel is usually set to full on position and the listening volume is set by the intercom volume control to the left of the speaker.
If several channels are being listened to at the same time, it might be desirable to adjust the individual listen levels of each channel for the desired mix.
Talking on Intercom Channels
To talk on an intercom channel, press the desired talk button. Pressing and holding the button will cause the function to be active only while the button is held (momentary). Pressing and releasing the button quickly will cause the function to latch on if it was off or turn off if it was on (latching).
The latching function can be defeated on an individual channel with an option DIP switch beneath the access panel (latch disable DIP switch).
The button will be illuminated blue when the talk function is off and amber when the talk function is on.
Another option allows the automatic setting of a listen function whenever a talk is active (auto-listen DIP switch) for each channel.
The All-Talk Function
Pressing the button marked all talk sends the selected microphone to all channels while the button is pressed (momentary only). This button lights amber when pressed.
Monitoring Main Program
SB-704 MAIN STATION
1-5
The main program input is the one on the XLR connector on the rear panel. To listen to the main program in the speaker or headphone, adjust the program level control just below the link and all talk pushbuttons.
Sending and Receiving Call Signals
To send a call signal on an intercom channel press the call button for that channel. This is a momentary function.
If the auto-call option is selected for that channel, activating a talk button will also send a call to that channel.
Receiving a call signal is indicated by a flashing red call button.
Linking Intercom Channels Together
A pushbutton allows the connecting of intercom channels B, C, and D to channel A. The link pushbutton is latching in action. The link button illuminates amber when all channels are linked together. In the latched position, the entire station operates as one party line.
Tal k and listen buttons are non-functional on channels B, C, and D when they are linked to channel A.
The Announce Function
A single pushbutton sends the active microphone’s audio to the announce output on the rear panel. Any active talks are disabled while the announce button is held. The announce button illuminates amber when held. Tal k and listen latches are not reset, but the microphone’s audio does not go to the intercom line while the announce function is active. A set of relay contacts are activated to control some external device.
There is an option which allows program audio to be fed to the announce output. If this option is enabled, the announce pushbutton interrupts this audio when it is pressed. Program audio feed to the announce output is selected by setting jumper J11 on the main board to the on position.
Channel Assignments Using the Slide Switch Matrix
The ten assignment switches let you assign the switchboard destinations (#1 - #10 on the rear panel) to any of the four main intercom channels (A, B, C, or D), an isolated off channel, or a separate common party line just for these inputs.
When the switchboard destinations are assigned to the off position, they are isolated from all other switchboard destinations and isolated from the four main intercom channels. Stations on one of these lines can only talk to each other. A call signal on one of these lines will be indicated by the amber LED above the particular matrix switch. Pressing the all talk button on the station will send the microphone to the channel in the off position.
1-6
When the switchboard destinations are assigned to the party-line position, all destinations that are placed in the party-line position will be connected into a common party line isolated from the rest of the station. Pressing the all talk
SB-704 MAIN STATION
button on the station will send the microphone to all channels in the party-line position.
Remote Mic Kill Function
When you press the remote mic kill pushbutton, the talk function shuts off for every beltpack on all four channels. If the talk functions of a large number of beltpacks have inadvertently been left activated, incidental noise and talking can make it difficult or impossible to communicate on the party line intercom. The remote mic kill button can be pressed to quiet the line in this situation. Those needing to communicate can then set their talk functions to on as needed.
Note: The remote mic kill button only functions if the SB-704 main
station is powering all of the stations in the system. Pressing the button momentarily interrupts power to the other beltpacks and stations in the system. If there are other power supplies or main stations in the system, then the remote mic kill switch cannot interrupt power and therefore cannot work.

HIDDEN FRONT PANEL OPTIONS AND ADJUSTMENTS

This section describes the option DIP switches and various adjustment controls behind the access panel on the front panel. These option switches and controls are usually set and not used in daily operation of the unit.
To gain access to these controls, pull on the two latches on either end of the access panel and remove it.
DIP Switch Options
The unit is shipped with all DIP switches, except the Headset Audio Limiter switch, in their default positions (up). The Headset Audio Limiter switch is shipped in the down (on) position.
The following functions are enabled with DIP switches:
• HEADSET AUDIO LIMITER: The HS dip switch turns the headset audio limiter on or off. Unless an especially high volume is needed, this switch should be left in the on position to protect the hearing of the user.
• INTERRUPT ENABLE: Three DIP switches enable the program interrupt function on channels B, C, and D. Program interrupt is not available on channel A.
• AUTO-CALL: Four DIP switches (one for each channel) enable automatically sending a call signal whenever a talk is active on the enabled channel.
• AUTO-TALK/LISTEN: Four DIP switches (one for each channel) enable automatically setting the listen function whenever a talk is active on the enabled channel.
SB-704 MAIN STATION
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