Clear-Com KB-702GM User Manual

CLEAR-COM ENCORE
KB-702/KB-702GM TWO-CHANNNEL
SPEAKER STATIONS
INSTRUCTION MANUAL
KB-702/KB-702GM Two-Channel Speaker Stations Instruction Manual
Part Number: 810492Z Rev. 3
Legal Disclaimer
Copyright © 2013 HME Clear-Com Ltd.
All Rights Reserved
Clear-Com, the Clear-Com logo, and Clear-Com Concert are trademarks or registered trademarks of HM Electronics, Inc. The software described in this document is furnished under a license agreement and may be used only in accordance with the terms of the agreement.
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
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Internal Adjustments and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Block Diagram for the KB-702 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Block Diagram for the KB-702GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 4-1
KB-702/KB-702GM Two-Channel Speaker Stations . . . . . . . . . . . . . . . . . 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
KB-702/KB-702GM TWO-CHANNEL
i
ii
KB-702/KB-702GM TWO-CHANNEL SPEAKER
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. Only use attachments/accessories specified by the manufacturer.
10. 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.
11. Unplug this apparatus during lightning storms or when unused for long periods of time.
12. 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.
13. WARNING: To reduce the risk of fire or electric shock, do not expose this product to rain or moisture.
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 station is used improperly. They also refer you to important operating and maintenance instructions in the manual.
KB-702/KB-702GM TWO-CHANNEL
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 KB-702 and KB-702GM stations meet all relevant CE and FCC 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.
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.
iv
KB-702/KB-702GM TWO-CHANNEL SPEAKER

OPERATION

INTRODUCTION

Congratulations and thank you for choosing this Clear-Com product. The KB-702 and KB-702GM two-channel speaker stations are powerful, user-friendly units that can serve as versatile intercom stations.
Please read this manual completely to better understand the functions of these products. For questions not addressed in this manual, contact the dealer or Clear-Com directly. Clear-Com applications support and service people are ready to help.

DESCRIPTION

The Clear-Com KB-702 is a two-channel speaker station ideal for theatre, live performances, industrial applications, and small TV facilities. It features excellent speech intelligibility even in high-noise environments and can be tailored to your needs through its programmable options.
In addition, the Clear-Com KB-702GM contains a jack for an optional Clear-Com gooseneck panel microphone and a close-in, voice-controlled circuit (VOX). This circuit allows automatic, alternate dipping of the panel microphone and the speaker in response to conversation.
Selectable two-channel talking and/or listening allows the operator to communicate on either of the intercom channels. The dual-action talk button is electronic momentary or latching. Monitoring can be done through the headset, the integral speaker, or both at once. The KB-702 offers both visual and audible call signaling to attract the attention of operators. The remote mic kill (RMK) feature on main stations will turn off any open mics on the KB-702.
A balanced program input allows the monitoring of external audio using the headset or speaker. This program input can also be used as a paging function.
The KB-702 speaker station accepts dynamic headsets. A sidetone control allows the operator to vary the level of his/her own voice as heard in the headset and speaker.
The integral speaker can be turned on or off by a convenient front panel switch. An automatic speaker dipping circuit will lower the level of the speaker whenever the talk button is activated. This feature helps minimize acoustical feedback.
The KB-702 receives power from the Clear-Com intercom line. The unit mounts either in a standard four-gang electrical outlet box or in an optional Clear-Com four-gang V-box. The extra-thick front panel and compact surface-mount circuitry maintains legendary Clear-Com ruggedness. The two intercom channels connect to a plug-on screw terminal strip. Male and female
KB-702/KB-702GM TWO-CHANNEL
1-1
3-pin XLR connectors are provided on the four-gang V-box for an inline
Speaker
Program Level
Off On
A
B
Channel Select
KB-702KB-702
Call
Talk
Sidetone
Headset
Volume
2-Channel Speaker Station
3
4
9
2
1
5
7610
connection to one of the intercom channels.
The optional EB7-TW daughter board module can be installed to provide an interface to two intercom channels on a single microphone cable. Also, the EB7-4W four-wire daughter board module is available to allow long-distance connections using separate pairs of wire for send audio and receive audio. The EB7-4W four-wire option supports two-channel operation.
The KB-702 and KB-702GM are compatible with all Clear-Com party-line intercoms.

OPERATION

Normal operation of the KB-702 speaker station requires access only to the front panel controls. The controls located elsewhere on the unit are intended to be set-and-forget in nature. For intercom operation, set the listen level control to the desired level and press the talk button when talking. If a headset or handset is used, set the sidetone control for each channel for the desired amount of sidetone in the earphone. If a hand-held push-to-talk mic is used, or if the panel mic is used on the KB-702GM, set the sidetone controls for minimum feed-through to the speaker to prevent acoustic feedback.

FRONT PANEL

The controls, indicators, and connectors found on the KB-702 and KB-702GM front panels are shown in the following figures and are described by the following text. The numbers in the left column refer to Figure 1-1 and Figure 1-2.
1-2
KB-702/KB-702GM TWO-CHANNEL SPEAKER
Figure 1-1: KB-702 Front Panel
1. Talk Button and Indicator: The talk button activates the microphone
Speaker
Program Level
Off On
A
B
Channel Select
KB-702GMKB-702GM
Call
Talk
Sidetone
Headset
Panel Mic
VOX
Headset
Volume
Microphone
2-Channel Speaker Station
6
7
3
4
9
2
8
1211
10
5
1
feed to the selected intercom channel. It has a dual action (momentary or latching) depending upon how the button is pressed. If desired, the latching function can be defeated using an internal option switch. The
following describes the various functions of this button.
MOMENTARY: Press and hold the talk button while you are
speaking. Release it when you are finished. The button lights amber when the talk function is active and blue when it is inactive.
LATCHING: Press the button quickly to latch the talk function. Press
the button again to turn off the talk function.
VOX INDICATION: On the KB-702GM, when the VOX feature is
enabled, the talk button illuminates amber to indicate an active talk, and the VOX light illuminates amber to indicate that the panel microphone is in use. This will automatically dip the speaker.
2. Call Button and Light: Pressing the call button will send a call signal on the selected channel. All the call lights on that channel will then flash. Call signals can also be sent while talking if required. The call button will light when pressed, or whenever a call signal is present on the selected channel. An internal option jumper can be set to allow the call button to light when a call signal is present on either channel.
3. Tone Alert: An audible tone alert can be enabled to sound when a call signal is received on the selected channel or either channel. This can be useful when the operator’s attention has been drawn away from the KB-702 indicator panel. The audible tone alert level can be adjusted or turned off by an internal control. The tone alert will not sound if a call
KB-702/KB-702GM TWO-CHANNEL
Figure 1-2: KB-702GM Front Panel
1-3
signal originates at the KB-702 station or if the speaker on/off switch is turned off. The tone alert plays through both the speaker and headset if the speaker on/off switch is turned on.
4. Volume Control: Turn this control to set the volume required on the speaker or headset. This control does not affect the tone alert level or the program input level.
5. Sidetone Control: Sidetone is the level of your own voice that you hear while talking on the intercom. Setting a comfortable level of sidetone will ensure that the intercom line sounds alive and also helps you modulate your voice relative to other voices on the line.
Typically, different sidetone null settings are needed depending upon whether you are using the speaker. Use one of the following procedures to correctly set the sidetone level control.
Sidetone Adjustment Procedure for Headset:
1. Set the intercom level control to a comfortable level by having
someone talk to you from another station.
2. Press the talk button and speak into the microphone while turning the
sidetone null control slowly back and forth until you hear your voice at a comfortable level in the headset.
Sidetone Adjustment Procedure for Gooseneck Mic (KB-702GM only) or hand-held push-to-talk mic with the speaker turned on:
1. Set the VOX control fully counterclockwise to disable this feature.
2. Set the intercom level control to a comfortable level.
3. Press the talk button and speak into the microphone while turning the
sidetone null control slowly back and forth. There should be a point where your voice (and any accompanying acoustic feedback) disappears. This is the null point.
4. Readjust the VOX control. (Refer to the VOX control paragraph in
this section.)
6. Program Level Control: Adjust the program level control to set the program audio level heard in the headset or panel speaker.
Note: Do not force the trimpots past their stop points. This will damage
them.
7. Speaker On/Off Switch: The speaker on/off switch turns the front panel speaker on or off. This switch also controls whether the tone alert is heard through the speaker. The speaker volume will automatically dip whenever the talk function is set, unless the VOX function is disabled.
8. Mic Select Switch (KB-702GM only): The mic select switch selects whether the panel microphone or the headset microphone is active. If the VOX feature is enabled, it is only operational when the panel microphone is active.
9. Channel Switch: This switch selects whether the speaker station is active on intercom channel A or channel B.
10. Headset Connector: The headset connector is located on the front panel. All Clear-Com headsets are recommended for use with the KB-702. The Clear-Com handheld push-to-talk microphone will also plug into the
1-4
KB-702/KB-702GM TWO-CHANNEL SPEAKER
headset connector. The following is a description of the characteristics of a suitable headset:
Mic Type --- Dynamic; see technical specifications for details
Headphone --- Dynamic; see technical specifications for details
The wiring of the headset is to be as follows:
Pin 1 --- Mic common
Pin 2 --- Mic hot
Pin 3 --- Headphone common
Pin 4 --- Headphone hot
The mic and headphone wiring in the headset cord must be individually shielded. Do not connect pins #1 and #3 together. Headset extension cords or headset “Y” cables are not recommended because they will increase crosstalk between channels.
11. Panel Mic Connector (KB-702GM only): Clear-Com recommends the GM-9 and GM-18 plug-in panel microphones for use with the KB-702GM. The GM-9 is 9 in. (23.04 cm) long and the GM-18 is 18 in. (46.08 cm) long. Both are the electret type. The 1/4 in. (0.64 cm)phone jack on the microphone mates with the panel mic receptacle on the front panel of the KB-702GM.
To install a GM-9 or GM-18 microphone, use the following steps:
1. Remove the plastic plug from the jack, if present.
2. Check and unscrew the set screw in the mic mounting flange to make
sure it is clear of the threads in the bushing.
3. Screw the microphone into the bushing hand tight.
4. Turn the set screw on top of the mic mounting flange clockwise to
lock the microphone in place.
12. VOX Control (KB-702GM only): When the panel microphone is selected on the KB-702GM, the VOX control should be adjusted for proper operation. This control is located to the right of the panel mic connector. Use a narrow flat blade screwdriver such as a greenie or
tweaker for this adjustment. When the adjustment is correctly set, the VOX light illuminates amber when speaking into the panel microphone.
Turning the control clockwise makes the KB-702GM more sensitive to your voice. The VOX feature can be disabled by turning the VOX control fully counterclockwise.
INTERNAL ADJUSTMENTS AND CONNEC­TIONS
The controls and connectors found inside the KB-702 are shown in the following figure and described by the following text. The controls can be accessed without completely removing the panel from its wall box or V-Box enclosure by removing the top two screws and loosening the bottom two screws a few turns. Then lean the panel out from the wall. The controls will
KB-702/KB-702GM TWO-CHANNEL
1-5
then be accessible as shown in the lower view of Figure 1-3. The numbers in
P1 Call on Both
P1 Call on
Selected
P3 Must be
installed if
no option
P2 Must be
installed if no option
1 2 3
15 16
17
1413
View from top
of KB-702
Front Panel
18
the left column of the following descriptions refer to Figure 1-3.
Figure 1-3: Internal Adjustments and Connections
13. Call Alert Tone Level Control: This control adjusts the volume of the call alert tone sound. This is normally adjusted when the system is set up and there should be no need to adjust it in normal operation. This feature can be disabled by turning the control fully counterclockwise.
14. Option Switches: Three option switches are provided. They should be configured when the system is set up, but are not changed in normal operation. Note the on position of each switch is toward the circuit board and the off position is toward the front panel. The default position of the switches is in the off position. The function of each switch is as follows:
1. SINGLE CHANNEL: In some installations, the KB-702 is intended
to be used only with one intercom channel. Setting the single channel switch to the on position will connect the KB-702 to the one intercom channel regardless of the position of the front panel channel selector. In two-channel installations, this switch must be set to the off position.
2. LONG LINE: If a long cable run is unavoidable and approaches
700 ft. (213.5 m) or more, set the long line option switch to the on position. The ability to set a sidetone null depends upon properly setting this switch.
3. LATCH DISABLE: Setting the latch disable switch to the on position
will disable the latching function of the talk button. In this mode, the talk button must be continuously pressed while the operator is talking.
1-6
KB-702/KB-702GM TWO-CHANNEL SPEAKER
15. Call Signal Jumper: In some installations it is important to receive a call signal from either channel, regardless of the setting of the channel selector. The plug-on jumper P1 makes the call light respond to either (a) the selected channel or to (b)either channel, depending upon its orientation. By default, the jumper is set to the selected channel position. When the TW or 4-Wire Option modules are installed, this jumper is not used. In TW operation, the call signal always originates on channel A. In 4-Wire operation, the call signal is not used.
16. Intercom Line Connection: The KB-702 contains a 5-terminal plug-on connector for intercom line connection. This connector is intended to be unplugged from the circuit board when connecting the intercom line, and then plugged back on when the wiring is completed. The connections for each pin are visible on the circuit board when the connector is unplugged. The pinout of this connector is as follows:
Pin 1 --- (NC)
Pin 2 --- Channel A Audio
Pin 3 --- Channel B Audio
Pin 4 --- Power
Pin 5 --- Ground (Shield)
One Channel
Cable Wiring:
Pin 5
Pin 1
KB-702 Intercom
Connector
Figure 1-4: One-Channel Cable Wiring
1
3
2
XLR
Connector
Channel A
KB-702/KB-702GM TWO-CHANNEL
1-7
Two Channel
Program Input
Cable Wiring
KB-702 Program
Input Connector
XLR
Connector
Pin 1
1
3
2
Pin 3
Cable Wiring
Pin 5
1
Channel B
3
2
1
Channel A
Pin 1
KB-702 Intercom
Connector
Figure 1-5: Two-Channel Cable Wiring
17. Program Input: A 3-terminal plug-on connector provides the program input to the station. Program is fed to the headset and speaker. The level to the speaker or headset is controlled by the program level control. The program input accepts a balanced or unbalanced line-level audio signal. If this input is connected to the stage announce (SA) output of a main station it can be used as a paging input. Since the level of this input is independently adjustable from the intercom audio volume, it can be used to override the intercom audio.
The pinout of the program input connector is as follows:
Pin 1 --- Ground (shield)
Connectors
3
2
XLR
1-8
Pin 2 --- + Signal
Pin 3 --- - Signal
Figure 1-6: Program-Input Cable Wiring
18. Option Board Jumpers: The three jumper plugs P1, P2, and P3 must be installed when optional modules are not used. When the optional EB7-4W four-wire or EB7-TW modules are used, both P1 and P3 must be removed. In the KB-702GM, P2 is replaced by the VOX module. Save these jumper plugs for possible future use after removing them. The
KB-702 will not operate without either these jumper plugs or the optional modules installed.
KB-702/KB-702GM TWO-CHANNEL SPEAKER
KB-702/KB-702GM TWO-CHANNEL
1-9
1-10
KB-702/KB-702GM TWO-CHANNEL SPEAKER

INSTALLATION

1. Unpack the unit and inspect for any damage that may have occurred in shipping.
2. Set the option switches to the default (up) position.
3. Connect the intercom lines. If only one intercom line is to be connected, turn option switch #1 to the on or closed position.
4. Install the KB-702 into the four-gang outlet box or V-box. (For additional information, refer to the Clear-Com System Installation Manual.)
5. Set listen levels and sidetones. (Refer to the listen level and sidetone setting topics in the Operation chapter of this manual.)
6. The speaker station should now be operating properly.
7. Read the rest of this manual for further information.
KB-702/KB-702GM TWO-CHANNEL
2-1
2-2
KB-702/KB-702GM TWO-CHANNEL SPEAKER

MAINTENANCE

EQ/ LIM
Headset
Mic
Talk
Sidetone
Null
Call
Light
Call
Intercom
Volume
Speaker
On/Off
TW Option
Channel
Switch
Ch. A
Speaker
Powe r
Ch. B
Call Send &
Receive
RMK
Microprocessor
Talk
Headset
Output
Balanced
Program
Input
Speaker
Dip
Program
Mute
Mic
Mute
Common +30 VDC
Ground
Latch
Disable
Long Line
Program
Level
Call Alert
Tone Level
4-Wire
Input
4-Wire
Output
2-Wire / 4-Wire
Select
Rectifier
16 VAC
Powe r
Ch. B
Ch. B
Ch. A
Ch. A
4-Wire Option
Single
Chan.
This chapter provides maintenance information including block diagrams and tips for solving problems.
Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical
shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

BLOCK DIAGRAM FOR THE KB-702

Figure 3-7: KB-702 Block Diagram
KB-702/KB-702GM TWO-CHANNEL
3-1

BLOCK DIAGRAM FOR THE KB-702GM

Headset
Mic
Panel
Mic
Mic Select
Talk
RMK
EQ/ LIM
Mic Dip /
Mute
Microprocessor
Talk/ VOX
Red /
Green
Latch
Disable
VOX
Powe r
TW Option
Sidetone
Null
Long Line
Call Alert
Tone Level
Call
Call Send &
Receive
Speaker
Dip
Call
Light
Channel
Switch
Intercom
Volume
Program
Level
Single Chan.
Program
Mute
Speaker
On/Off
Speaker
Headset
Output
Balanced
Program
Input
Common
+30 VDC
Ch. B
Ch. A
Ground
16 VAC
4-Wire Option
Rectifier
Powe r
2-Wire / 4-Wire
Select
Figure 3-8: KB-702GM Block Diagram
Ch. B
4-Wire
Input
Ch. A
Ch. B
4-Wire
Output
Ch. A
3-2
KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

TROUBLESHOOTING

SYMPTOM CAUSE SOLUTION
System does not operate. Tal k button does not light.
Speaker does not operate. Tal k button lights amber when pressed.
Hum or buzz in system Inductive pickup caused by close
No intercom connection to the KB-702. If the EB7-4W four-wire option module is connected, the KB-702 may not be receiving AC power.
The KB-702 has an internal failure. Unit requires servicing.
Speaker switch turned off, volume knob turned all the way down, or channel switch set to unused channel.
Speaker plug or wiring has come loose.
Plug P3 missing on circuit board. Plug P3 must be installed in jack J3
proximity of this speaker station or connected stations to power lines or transformers.
Check connections and cable.
Adjust controls appropriately.
Make sure speaker is connected internally.
if the EB-TW or EB7-4W options are not used.
Relocate the offending unit or wiring. If the cable run is exceptionally long, consider adding and using the EB7-4W four-wire option module. (Requires an additional four-wire interface at the opposite end of the “long run.”)
System feedback (Acoustical) Intercom level control at this station
or another station is set too high.
Sidetone null control at this station or another station is not adjusted correctly.
Channel not terminated. Set the main station or power supply
Channel switch set to an unconnected channel.
A headset extension cord was used. Headset extension cords are not
KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS
Adjust.
Adjust. Refer to the chapter “Operation.”
termination switch for that channel to the on position.
If only one intercom line is connected, set option switch #1 to the on or closed position to link both channel switch positions to the same intercom line.
recommended.
3-3
SYMPTOM CAUSE SOLUTION
VOX problems (KB-702GM only)
Excessive crosstalk High DC resistance has a ground
Program signal sounds distorted.
Stays tripped (amber light on). Sensitivity set too high.
Will not trip with voice. Sensitivity set too low.
return.
Multi-channel cable pairs are not individually shielded.
Headset cables are not wired properly or shielded properly.
Program level control set too high. Turn the program level control
Overload of program input circuit. Reduce the gain of the program
Turn VOX sensitivity control in a counter-clockwise direction.
Turn VOX sensitivity control in a clockwise direction.
Note: VOX is intended for close-in operation.
Use heavier cable; add additional conductor(s) to ground return. If the cable run is exceptionally long, consider adding and using the EB7-4W four-wire option module.
Replace cable with individually shielded pairs.
Correct wiring. Use headsets with properly shielded wiring. Refer to the chapter “Operation.”
counter-clockwise.
signal at the source, such as an audio mixer.
Call signal does not function. Excessive DC loading of intercom
line.
Far too many terminations on the intercom line.
Plug P1 missing on circuit board. Plug P1 must be installed in jack J1
Remove any audio transformers or other equipment that may be connected across the intercom line. If equipment other than Clear-Com intercom equipment must be connected to the intercom line, please contact Clear-Com application or service personnel for information or recommendations.
Check all main stations and power supplies to make sure each intercom channel is terminated at only one point.
if the EB7-4W or EB7-TW options are not used.
3-4
KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS
3-5
KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS
3-6
KB-702/KB-702GM TWO-CHANNEL SPEAKER

TECHNICAL SPECIFICATIONS

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS
Panel Microphone Input (KB-702GM)
Input Type Electret Input Impedance >=2K Mic Limiter Threshold -2dBu ±3dB Mic Limiter Range >= 15dB
Headset Microphone Input
Input Type Dynamic Input Impedance >= 1K Mic Limiter Threshold -2dBu ± 3dB Mic Limiter Range >= 15dB
Ω
Ω
Program Line Input
Maximum Level before Clipping >= 20dBu Input Impedance >= 5K
Ω
Headset Output
Load Impedance >= 8 Output Impedance <= 25 Output Limiter Threshold +5dBu ± 3dB Maximum Output Level before Distortion >= 17dBu
Ω
Ω
Speaker Output
Load Impedance >= 4 Max Output Level before 1% Distortion 20dBu ± 2dBu
Ω
Party Line Output
Off Noise < -74dBu Output Impedance >10K
Ω
Party Line Input
Crosstalk < -60dB Max level before Clipping >= 12dBu Sidetone Null Capability (KB-702GM only) > 25dB
KB-702/KB-702GM TWO-CHANNEL SPEAKER STA-
4-1
Frequency Response
Panel Mic - Party Line (KB-702GM only) 300 - 16KHz ± 3dB Headset Mic - Party Line 300 - 15KHz ± 3dB Program Input - Headset Out 200 - 18KHz ± 3dB Program Input - Speaker Out 200 - 18KHz ± 3dB Party Line - Headset Out 200 - 18KHz ± 3dB Party Line - Speaker Out 200 - 18KHz ± 3dB
Max Distortion
Panel Mic - Party Line (KB-702GM only) <= 0.5% Headset Mic - Party Line <= 0.5% Program Input - Headset Out <= 0.2% Program Input - Speaker Out <= 0.5% Party Line - Headset Out <= 0.2% Party Line - Speaker Out <= 0.5%
Noise
Panel Mic - Party Line (KB-702GM only) < -65dBu Headset Mic - Party Line < -70dBu Program Input - Headset Out < -60dBu Program Input - Speaker Out < -60dBu Party Line - Headset Out < -50dBu Party Line - Speaker Out < -50dBu
Max Gain
Panel Mic - Party Line (KB-702GM only) >= 37dB Headset Mic - Party Line 41dB ± 2dB Program Input - Headset Out >= 18dB Program Input - Speaker Out >= 24dB Party Line - Headset Out >= 34dB Party Line - Speaker Out >= 40dB
Power
Input Voltage Range 20-30 VDC Input Current (Idle) <= 90mA Input Current (Max) <=110mA
Internal Adjustments and Connections
Intercom: Line Five terminal connector Program Input Three terminal connector Option Switches Three DIP switches Call Signal Jumper3 Three sets of options jumpers Call Alert Tone Level Control Level adjustment control
4-2
KB-702/KB-702GM TWO-CHANNEL SPEAKER
Front Panel Connectors
Panel Mic: (KB-702GM only) (1) 1/4 in. (0.64 cm) panel
mounting jack
Headset: (1) XLR-4M
Front Panel Controls & Indicators (KB-702GM)
(1) Panel / headset mic switch (1) Program monitor level control (1) Sidetone null control (1) Talk button (1) Call button (1) Speaker ON-OFF switch (1) Channel select switch (1) Speaker volume control (1) VOX control (1) VOX indicator
Front Panel Controls & Indicators (KB-702)
(1) Program monitor level control (1) Sidetone null control (1) Talk button (1) Call button (1) Speaker ON-OFF switch (1) Channel select switch (1) Speaker volume control
Environmental
32 - 122o F (0 - 50o C)
Dimensions (KB-702/KB-702GM)
8.25 in. W x 4.5 in. H x 1.75 in. D (210 mm x 114 mm x 44 mm)
Wei ght
KB-702 0.99 lbs. (0.45 Kg) KB-702GM 1.1 lbs.(0.50 Kg)
Notice About Specifications
While Clear-Com makes every attempt to maintain the accuracy of the information contained in its product manuals, that information is subject to change without notice. Performance specifications included in this manual are design-center specifications and are included for customer guidance and to facilitate system installation. Actual operating performance may vary.
KB-702/KB-702GM TWO-CHANNEL
4-3
4-4
KB-702/KB-702GM TWO-CHANNEL SPEAKER
Clear-Com offers 24 x 7
customer support if you
have an Extended
Warranty or Service
Contract.
Return Material
Authorization (RMA)
numbers are required for
all returns.

LIMITED WARRANTY

Clear-Com warrants that at the time of purchase, the equipment supplied complies with any specification in the order confirmation when used under normal conditions, and is free from defects in workmanship and materials during the warranty period.
During the warranty period Clear-Com, or any service company authorized by Clear-Com, will in a commercially reasonable time remedy defects in materials, design, and workmanship free of charge by repairing, or should Clear-Com in its discretion deem it necessary, replacing the product in accordance with this limited warranty. In no event will Clear-Com be responsible for incidental, consequential, or special loss or damage, however caused.

WARRANTY PERIOD

The product may consist of several parts, each covered by a different warranty period. The warranty periods are:
Both warranty and
non-warranty repairs are
available.
• Cables, accessories, components, and consumable items have a limited
warranty of 90 days.
• Headsets, handsets, microphones, and spare parts have a limited warranty
of one year.
• UHF wireless IFB products have a limited warranty of one year.
• UHF wireless intercom systems have a limited warranty of three years.
• All other Clear-Com and Drake brand systems and products, including
beltpacks, have a limited warranty of two years.
The warranty starts at the time of the product’s original purchase. The warranty start date for contracts which include installation and commissioning will commence from the earlier of date of the Site Acceptance Test or three months from purchase.

TECHNICAL SUPPORT

To ensure complete and timely support to its customers, Clear-Com’s User Support Center is staffed by qualified technical personnel. Telephone and email technical support is offered worldwide by the User Support Center.
The User Support Center is available to Clear-Com’s customers during the full course of their warranty period. Telephone support during the warranty
WARRANTY
i
period will be offered at no charge between 09:00 and 17:00 according to the customer’s local time zone.
In addition, for customers who purchase an Extended Warranty or Service Contract, 24-hour customer support is offered immediately upon purchase of such agreement. For more information, contact your authorized dealer, distributor, or sales representative.
Instructions for reaching Clear-Com’s User Support Centers are given below.
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
Once the standard warranty period has expired, the User Support Center will continue to provide telephone support if you have purchased an Extended Warranty or Service Contract. In these cases, you will have access to telephone support 24 hours per day, 7 days per week.

WARRANTY REPAIRS AND RETURNS

Before returning equipment for repair, contact a User Support Center to obtain a Return Material Authorization (RMA). Clear-Com representatives will give you instructions and addresses for returning your equipment. You must ship the equipment at your expense, and the support center will return the equipment at Clear-Com’s expense.
For out-of-box failures, use the following contact information:
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
ii
WARRANTY
Clear-Com has the right to inspect the equipment and/or installation or relevant packaging.

NON-WARRANTY REPAIRS AND RETURNS

For items not under warranty, you must obtain an RMA by contacting the User Support Center. Clear-Com representatives will give you instructions and addresses for returning your equipment.
You must pay all charges to have the equipment shipped to the support center and returned to you, in addition to the costs of the repair.

EXTENDED WARRANTY

If you purchase an Extended Warranty, you are also given access free of charge to the User Support Center 24 hours a day, 7 days a week.
You can purchase an extended warranty at any time during the first two years of ownership of the product. The purchase of an extended warranty extends to five years the warranty of any product offered with a standard two-year warranty. The total warranty period will not extend beyond five years. Any purchase of an extended warranty provides 24 x 7 customer support in addition to the warranty immediately upon purchase of the warranty extension.
Note: Clear-Com does not offer warranty extensions on UHF wireless intercom systems, or on any product with a 1-year or 90-day warranty.

SERVICE CONTRACT

Clear-Com also offers service contracts that provide 24 x 7 telephone support, advance replacements, training, proactive maintenance, on-site visits, and no charge for repair or replacement of equipment. For more information, contact your authorized dealer, distributor, or sales representative.

LIABILITY

THE FOREGOING WARRANTY IS CLEAR-COM'S SOLE AND EXCLUSIVE WARRANTY. THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY OTHER REQUIRED IMPLIED WARRANTY SHALL EXPIRE AT THE END OF THE WARRANTY PERIOD. THERE ARE NO OTHER WARRANTIES (INCLUDING WITHOUT LIMITATION WARRANTIES FOR CONSUMABLES AND OTHER SUPPLIES) OF ANY NATURE WHATSOEVER, WHETHER ARISING IN CONTRACT, TORT, NEGLIGENCE OF ANY DEGREE, STRICT LIABILITY OR OTHERWISE, WITH RESPECT TO THE PRODUCTS OR ANY PART THEREOF DELIVERED HEREUNDER, OR FOR ANY DAMAGES AND/OR LOSSES (INCLUDING LOSS OF USE, REVENUE, AND/OR PROFITS). SOME STATES DO NOT ALLOW THE EXCLUSION OR
WARRANTY
iii
LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES OR THE LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU. IN ANY EVENT, TO THE MAXIMUM EXTENT PERMITTED UNDER APPLICABLE LAW, CLEAR-COM'S LIABILITY TO CUSTOMER HEREUNDER SHALL NOT UNDER ANY CIRCUMSTANCES EXCEED THE COST OF REPAIRING OR REPLACING ANY PART(S) FOUND TO BE DEFECTIVE WITHIN THE WARRANTY PERIOD AS AFORESAID.
This warranty does not cover any damage to a product resulting from cause other than part defect and malfunction. The Clear-Com warranty does not cover any defect, malfunction, or failure caused beyond the control of Clear-Com, including unreasonable or negligent operation, abuse, accident, failure to follow instructions in the manual, defective or improperly associated equipment, attempts at modification and repair not approved by Clear-Com, and shipping damage. Products with their serial numbers removed or defaced are not covered by this warranty.
This warranty does not include defects arising from installation (when not performed by Clear-Com), lightning, power outages and fluctuations, air conditioning failure, improper integration with non-approved components, defects or failures of customer furnished components resulting in damage to Clear-Com provided product.
This limited warranty is not transferable and cannot be enforced by anyone other than the original consumer purchaser.
This warranty gives you specific legal rights and you may have other rights which vary from country to country.
iv
WARRANTY
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