ClearCom | KB-212 | User manual | ClearCom KB-212 User manual

KB-212
SPEAKER STATION
USER MANUAL
Clear-Com Intercom Systems
KB-212 Speaker Station
Introduction
Congratulations and thank you for choosing this Clear-Com product.
The KB-212 Speaker Station is a powerful, yet user-friendly unit that can
serve as a versatile intercom station.
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 PL-Pro™ KB-212 speaker station is designed for use in
theatres, live performances, industrial environments, and small television
facilities. It features speech intelligibility, even in high noise levels, and can be
customized through its programmable options.
Local or remotely controlled talking or listening is selectable and allows either
hands-on or hands-free operation. The talk button operates in momentary
mode. The integral microphone and speaker offer half-duplex communication.
The KB-212 offers both visual and audible call signaling to attract the
attention of operators.
A balanced program input allows the monitoring of external audio through the
speaker. This program input can also be used as a paging function.
The integral speaker’s volume level can be adjusted using a front-panel knob.
An internal control allows setting a minimum speaker level. An automatic
speaker switching circuit will quiet the speaker when the talk button is
activated.
The KB-212 receives 30-VDC 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 V-Box. The extra-thick front panel and compact, surfacemount circuitry results in a reduced size and lighter weight package that
maintains Clear-Com ruggedness. The intercom channel connects to a plugon screw terminal strip. Male and female three-pin XLR connectors are
provided on the optional V-Box to offer a through connection to the intercom
channel.
Although the optional EB-4W daughter board module allows this unit to
function on a TW line, the unit’s operation will remain single channel. Also, the
EB-4W 4-Wire daughter board module is available to allow long-distance
connections using separate pairs of wires for send audio and receive audio.
The KB-212 is compatible with all Clear-Com Party-Line intercoms.
© Clear-Com Intercom Systems 2000
1
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
Quick Start
Rev. B
1.
Unpack the unit and inspect it for any damage that may have
occurred during shipping.
2.
Set the Option switches to the default (toward the front panel)
position.
3.
Connect the intercom lines.
4.
Install the KB-212 into the four-gang outlet box or V-Box. (For
additional information, refer to the Clear-Com PL-Pro™ System
Installation Manual.)
5.
Set Listen Levels. (Refer to “6—Intercom Level Control” on
page 4.)
6.
The speaker station should now be operating properly.
7.
Read the rest of this manual for further information.
2
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
Operation
Normal operation of the KB-212 Speaker Station only requires access 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.
Front Panel
The controls, indicators, and connectors on the KB-212 front panel are shown
in Figure 1 on page 3 and are described by the following text.
8
4
3
6
5
Call
Mic
Intercom Level
Program Level
PL
Talk
pro
KB-212
Speaker
S tat ion
1
2
7
FIGURE 1: Front Panel
1—Talk Button
The Talk button activates the microphone feed to the intercom channel. The
Talk button has a momentary action.
© Clear-Com Intercom Systems 2000
3
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
2—Talk Lamp
The Talk lamp lights when the microphone feed to the intercom channel is on,
whether this is activated locally by the Talk button or remotely from another
station using the call signal.
3—Call Button
Pressing the Call button will send a call signal and cause all the call lights on
other stations on the intercom channel to light.
4—Call Lamp
The Call lamp will light while the Call button is pressed, or when a call signal
is on the intercom channel.
5—Tone Alert
An audible tone alert can sound when a call signal is received on the intercom
channel. This can be useful when the operator's attention has been drawn
away from the KB-212 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 signal is originated at the KB-212 station.
Note: This feature is automatically turned off if the operating mode of the KB212 is set to any setting other than Normal.
6—Intercom Level Control
Turn this control to set the speaker’s required listen level. This control does
not affect the Tone Alert level or the Program Input level.
7—Program Level Control
Adjust the Program Level control to set the program audio level heard in the
panel speaker.
Note: Forcing the trimpots past their stop points will damage them.
8—Integral Microphone
The microphone for the KB-212 is built into the front panel.
Internal Adjustments and Connections
The controls and connectors inside the KB-212 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. The panel can then be leaned out from the wall to make the controls
accessible as shown in the lower view of Figure 2 on page 5.
Rev. B
4
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
14
13
P3 Must be
installed if
no option
P1 Must be
installed if
no option
12
View from top
of KB-212
1 2 3
Front Panel
11
9
10
FIGURE 2: Internal Controls
9—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 shouldn’t need to be adjusted during
normal operation. This feature can be disabled by turning the control fully
counterclockwise.
10—Minimum Volume Control
This control adjusts the minimum setting of the Intercom Level control on the
front panel. Setting this control can prevent people from inadvertently turning
the intercom level all the way down. This is normally adjusted when the
system is set up and shouldn’t need to be adjusted during normal operation.
This feature can be disabled by turning the control fully counterclockwise.
© Clear-Com Intercom Systems 2000
5
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
11—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 function of these switches is as follows:
•
Internal Microphone Gain (S1-1)— This switch determines the
microphone’s sensitivity. When the switch is in the ON position, talking
should be done within 2 ft. of the front panel. If it is necessary to talk
from a greater distance, the switch should be turned OFF. The default
position of this switch is in the ON position.
•
Operating Mode (S1-2 and S1-3)—These switches work together to
define the operating mode of the KB-212. In modes other than Normal,
the call signal from other stations on the same channel activates the
KB-212. Refer to the following table:
Mode
S1-2
S1-3
Normal
OFF
OFF
Description
Speaker is on
Mic is activated by the Talk button
Speaker turns on by remote call signal control
Remote Page
OFF
ON
Mic is activated by the Talk button
Speaker is on
Remote Listen
Remote Listen-Page
ON
ON
OFF
ON
Mic is activated by remote call signal control or by the
Talk button
Speaker turns on by remote call signal control or by
the Talk button
Mic is normally on
Table 1: KB-212 Operating Mode Options
•
The default position of these switches is in the OFF position for Normal
mode, which is the only mode in which the Call Alert Tone functions
operate. In other modes, the Call Alert Tone is automatically disabled to
avoid interference with operation.
Note: Only Normal mode may be used when the EB-4W 4-Wire Option
Module is installed.
Rev. B
6
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
12—Intercom Line Connection
The KB-212 contains a five-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—(NC)
•
Pin 3—Channel A Audio
•
Pin 4—Power (30 VDC)
•
Pin 5—Ground (Shield).
Pin 1
2
3
Channel A
1
XLR
Connector
KB-212 Intercom
Connector
FIGURE 3: Intercom Line Connector Wiring
13—Program Input
A three-terminal, plug-on connector provides the program input to the station.
Program is fed to the speaker. This level is controlled by the Program Level
control. The Program Input accepts a balanced or unbalanced line-level audio
signal from -20 dBv to +10 dBv. 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 in all modes
except Remote Listen-Page. The program input is also independent of the
Mode setting. The pinout of the Program Input connector is as follows:
•
Pin 1—Ground (Shield)
•
Pin 2— + Signal
•
Pin 3— - Signal.
© Clear-Com Intercom Systems 2000
7
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
g
Pin 1
2
3
1
KB-212 Program
Input Connector
XLR
Connector
FIGURE 4: Program Input Connector Wiring
14—Option Board Jumpers
The two jumper plugs P1 and P3 must be installed when optional modules are
not used. When the optional EB-4W or EB-TW Modules are used, both P1
and P3 must be removed. Save these jumper plugs for possible future use.
Note: The KB-212 will not operate without either the jumper plugs or the
optional modules installed.
Rev. B
8
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
EQ/
LIM
Intercom
Volume
Panel Mic
Speaker
Speaker
Mute
Min
Vol
Mic Gain
Mic Mute
Talk
Talk
Program
Mute
Call Alert
Tone Level
Microprocessor
Call
Operating
Mode
Options
Balanced
Program
Input
Program
Level
Call
Light
Call Send &
Receive
Power
Common
TW Option
+30 VDC
Intercom
(NC)
Ground
4-Wire
Input
16 VAC
Rectifier
Power
2-Wire / 4-Wire
Select
4-Wire
Output
4-Wire
Option
FIGURE 5: KB-212 Block Diagram
Troubleshooting
•
System does not operate. The Talk Light does not come on when
Talk button is pressed.
Scenario 1
No intercom connection to the KB-212. If the EB-4W 4-Wire Option Module is
connected, no AC power to the KB-212.
© Clear-Com Intercom Systems 2000
9
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
Solution: Check connections and cable.
Scenario 2
The KB-212 has an internal failure.
Solution: Unit requires servicing.
•
System operates incorrectly. The Talk Light does not come on
when Talk button is pressed or stays on until Talk button is
pressed and the Speaker is off when it should be on.
Scenario 1
Operating Mode switches are set incorrectly.
Solution: Refer to the option switch setting section of this manual.
•
Speaker does not operate. The Talk Light comes on when Talk
button is pressed.
Scenario 1
Intercom Level knob turned all the way down.
Solution: Adjust control appropriately.
Scenario 2
Speaker plug or wiring has come loose.
Solution: Make sure speaker is connected internally.
Scenario 3
Plug P3 missing on circuit board.
Solution: Plug P3 must be installed in jack J3 if the EB-4W or EB-TW option is
not used.
•
Hum or buzz in system
Scenario 1
Inductive pickup caused by close proximity of this speaker station or
connected stations to power lines or transformers.
Solution: Relocate the offending unit or wiring. If the cable run is exceptionally
long, consider adding and using the EB-4W 4-Wire Option Module. (Requires
an additional 4-wire interface at the opposite end of a “long run.”)
•
System feedback (Acoustical)
Scenario 1
Intercom Level control at this station or another station is set too high.
Solution: Adjust.
Rev. B
10
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
Scenario 2
Channel unterminated.
Solution: Set the Main Station or Power Supply termination switch for the
appropriate channel to the ON position.
Scenario 3
The KB-212’s microphone is too close to an open speaker on the same
channel.
Solution: Change the units’ location.
•
Excessive crosstalk
Scenario 1
High DC resistance in ground return.
Solution: Use heavier cable; add additional conductor(s) to ground return. If
the cable run is exceptionally long, consider adding and using the EB-4W 4Wire Option Module.
Scenario 2
Multi-channel cable pairs are not individually shielded.
Solution: Replace cable with individually shielded pairs.
•
Program signal sounds distorted.
Scenario 1
Program Level control set too high.
Solution: Turn the Program Level control counter-clockwise.
Scenario 2
Overload of Program Input circuit.
Solution: Reduce the gain of the program signal at the source, such as an
audio mixer.
•
The call signal does not function.
Scenario 1
Excessive DC loading of intercom line.
Solution: 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.
Scenario 2
Far too many terminations on the intercom line.
Solution: Check all main stations and power supplies to make sure each
intercom channel is terminated at only one point.
© Clear-Com Intercom Systems 2000
11
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
Scenario 3
Plug P1 missing on circuit board.
Solution: Plug P1 must be installed in the J1 jack if the EB-4W or EB-TW
options are not used.
Parts Lists
Parts List for the KB-212 Main PCB
Capacitors
Value
220
22
4.7
100
22
47
220
390
470
.0015
.0047
.01
.047
.1
Type
Aluminum
Tantalum
Aluminum NP
Aluminum
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Ceramic Disc SMD
Volts
35V
16V
50V
35V
50V
50V
50V
50V
50V
50V
50V
50V
50V
50V
Tol.
uF
uF
uF
uF
pF
pF
pF
pF
pF
uF
uF
uF
uF
uF
5%
5%
5%
5%
5%
5%
10%
10%
10%
10%
Part #
150021
150032
150087
150136
151116
151120
151128
151131
151132
151138
151156
151160
151168
151172
.22
.47
1
4.7
10
uF
uF
uF
uF
uF
Ceramic Disc SMD
Tantalum SMD
Tantalum SMD
Tantalum SMD
Tantalum SMD
50V
35V
16V
16V
25V
10%
10%
10%
10%
10%
151176
151184
151185
151189
151192
Designator
C5 C18
C21 C24
C13
C25 C45
C14
C7 C19 C30 C36
C26
C10
C17
C11
C27
C32 C33 C35 C38 C44
C23 C37
C3 C4 C12 C15 C29
C39C40 C41 C46 C47
C16 C22 C28
C31 C34
C6 C20 C43
C8
C42
Part #
410002
410005
410075
411181
411293
411339
411354
411358
411389
411397
411406
411418
Designator
R19 R45
R39
R28
R27
R40
R41
R15
R10
R29
R17
R31
R14 R38
Resistors
Value
10
390
1.3K
2.2
100
301
432
475
1.00K
1.21K
1.50K
2.00K
Rev. B
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
Power
1/4
1/4
1/2
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
Type
Carbon Film
Carbon Film
Carbon Film
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
Tol.
5%
5%
5%
5%
1%
1%
1%
1%
1%
1%
1%
1%
12
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
3.24K
4.75K
5.62K
6.19K
8.25K
10.0K
12.1K
20.0K
33.2K
47.5K
68.1K
100K
121K
221K
475K
1.0M
10K
47K
100K
Pot
Pot
Pot
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
10K
5K
5K
1/10
1/10
1/1O
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
1/10
KB-212 Speaker Station
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
X4 SMD DIP Isolated
X4 SMD DIP Isolated
X4 SMD DIP Isolated
TRIMPOT
TRIMPOT
POT
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
5%
1%
1%
1%
411438
411454
411461
411465
411477
411485
411502
411514
411535
411550
411565
411581
411589
411614
411646
411677
416016
416018
416019
470058
470063
470081
R26
R20
R18
R23
R42
R8 R44
R13 R33
R12 R24 R32
R43
R2 R4
R35 R36
R5 R21
R22
R48
R46 R47
R49
R1 R7 R9
R3
R6
R34 R30
R37
R25
Part #
390021
390057
480012
480088
481019
481023
481027
481033
481038
481050
481056
481061
481075
710508
Designator
D8
D3
IC5
IC10
D1 D7
IC1 IC2 IC8
Q2
D2 D5 D6
Q4
IC4
Q1
D4
Q3
IC9
Part #
210085
210370
240043
240057
240077
240081
Designator
P4
P2
R30 R34
R37
R25
S2
Diodes and Transistors
Device
LED
LED
IC
IC
Diode
IC
Transistor
Diode
Transistor
IC
Transistor
Diode
Transistor
IC
Description
LOW CURRENT GREEN T1 3/4 LED
LED, YELLOW, ULTRA BRIGHT T1 3/4
LM384 POWER 4W OP AMP 14 PIN
7805L POS 5V REGULATOR TO-92 PKG
BAV70 DUAL DIODE COM CATH... SMD
833 DUAL OPAMP... SMD
2907A PNP 60V 600MA... SMD
BAV99 DUAL DIODE... SMD
MPSA14 DNPN 30V 300MA... SMD
DG444 QUAD CMOS ANALOG SW SMD
J175 P-CHANNEL JFET... SMD
5.1V 5% ZENER 1/4W... SMD
MPSA64 DPNP 30V 500MA SMD
MICROPROCESSOR, KB/MR SERIES
Miscellaneous
Device
Connector
Connector
Pot
Pot
Pot
Button
Description
5 POS, SCREW TERM. PLUG-IN 5MM
3 POS, SCREW TERM. PLUG-IN 5MM
SHAFT FOR PIHER POT FIG 3 GREY PT10
PIHER TRIMPOT SHAFT, GREY
KNOB GREY INSERT
ROUND MINIATURE BUTTON, BLACK
© Clear-Com Intercom Systems 2000
13
Rev. B
KB-212 Speaker Station
Button
Lens
Speaker
Panel Mic
Switch
Switch
Clear-Com Intercom Systems
RECT. MINIATURE BUTTON, BLACK
LENS, YELLOW, ROUND FOR T1 3/4
2 1/2 IN. SPKR 8 OHM 3.5W
ELECTRET MIC ELEMENT W/PINS
DPDT P.B. MINIATURE W/LONG PLUNGER
DIP SWITCH PIANO 3 POS
RUBBER MIC MOUNT
240082
240099
500103
500132
510107
510114
640027
S3
D3
S2 S3
S1
FIGURE 6: Main PCB Component Layout
Rev. B
14
© Clear-Com Intercom Systems 2000
FIGURE 7: KB-212 Schematic
© Clear-Com Intercom Systems 2000
15
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
This page is a place holder.
Rev. B
16
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
Technical Specifications
Panel Microphone Pre-Amp
Input Type:
Gain from panel
mic to intercom line:
Electret
+25 dB, low sensitivity; +31.5 dB high sensitivity
Pre-Amp Response Curve
Frequency Response:
Limiter Range:
250 Hz to 12 kHz, contoured for intelligibility
20 dB
Speaker Amplifier
Speaker Type:
Power Output:
Frequency Response:
Signal-to-Noise:
Gain from intercom line:
Distortion:
Speaker Level:
2.5 in. round, 16 ohm
2 W into 16 ohms
200 Hz to 15 kHz, ±3 dB
75 dB
+37 dB
< 0.5% THD at 1 kHz
98 dB SPL at 3 ft.
Program Amplifier
(Transformerless, balanced differential input)
Input Level:
-20 dBV
Input Impedance:
> 100k ohm
Frequency Response:
150 Hz to 15 kHz, ± 3 dB
Power Requirements
Voltage:
Current:
30-VDC standard unit; 16 to 18 VAC with 4-Wire Option
Module
100 mA average
Internal Connectors
Intercom:
Program:
AC Power
(4-Wire Option Module):
five-position, plug-on screw terminals
three-position, plug-on screw terminals
two-position, plug-on screw terminals
Internal Controls
(3) Option switches; (1) Tone Alert Volume control; (1) Minimum Volume Level control
© Clear-Com Intercom Systems 2000
17
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
Front Panel Controls & Indicators
(1) Program Level control; (1) Intercom volume control; (1) Talk button; (1) Call button; (1)
Talk LED; (1) Call LED
Environmental
32 to 122 F (0 to 50 C)
Dimensions
8.25 in. W x 4.5 in. H x 1.75 in. D (210 mm x 114 mm x 44 mm)
Weight
1.04 lbs. (0.47 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-212 Manual P/N 810254
© 2000 Clear-Com Systems
All Rights Reserved
Rev. B
18
© Clear-Com Intercom Systems 2000
Clear-Com Intercom Systems
KB-212 Speaker Station
Clear-Com Limited Warranty
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 improper associated equipment, attempts at modification and
repair not authorized by Clear-Com, and shipping damage. Products with
their serial numbers removed or defaced are not covered by this warranty.
This warranty is the sole and exclusive express warranty given with respect to
Clear-Com products. It is the responsibility of the user to determine before
purchase that this product is suitable for the user's intended purpose.
Any and all implied warranties, including the implied warranty of
merchantability are limited to the duration of this express limited warranty.
Neither Clear-Com nor the dealer who sells Clear-Com products is liable for
incidental or consequential damages of any kind.
For your own records fill in the information below:
Model No
Serial No.
Date Purchased
Purchased from (dealer)
Address
City
State
ZIP
Factory Service
All equipment returned for repair must be accompanied by documentation
stating the return address, telephone number, date of purchase, and a
description of the problem.
Note: Do not return any equipment to the factory without first obtaining a
Return Authorization Number.
Send equipment to be repaired to:
Customer Service Department
Clear-Com Intercom Systems
4065 Hollis Street
Emeryville, CA 94608-3505
Telephone: (510) 496-6666
Fax: (510) 496-6601
Warranty Repairs
If in warranty, no charge will be made for the repairs. Equipment being
returned for warranty repair must be sent prepaid and will be returned
prepaid.
© Clear-Com Intercom Systems 2000
19
Rev. B
KB-212 Speaker Station
Clear-Com Intercom Systems
Non-Warranty Repair
Equipment that is not under warranty must be sent prepaid to Clear-Com. If
requested, an estimate of repair costs will be issued prior to service. Once
repair is approved and repair of equipment is completed, the equipment will
be shipped freight collect from the factory.
Rev. B
20
© Clear-Com Intercom Systems 2000
4065 Hollis Street, Emeryville, CA 94608
(510) 496-6666 Fax (510) 496-6601
Manual Part Number 810254 Rev. B
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