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.
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.
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.
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.
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.
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.
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.
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.
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 do
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.
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.
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 .
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.
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.
FIGURE 7: KB-212 Schematic © Clear-Com Intercom Systems 2000 15 Rev.
KB-212 Speaker Station Clear-Com Intercom Systems This page is a place holder. Rev.
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.
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.
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.
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.
4065 Hollis Street, Emeryville, CA 94608 (510) 496-6666 Fax (510) 496-6601 Manual Part Number 810254 Rev.
