KB-112 Speaker Station INSTRUCTION and SERVICE MANUAL I i IFIintercom Systems ~jliClear-Com 945 Camelia St. Berkeley, California 94710 510-527-6666 Clear-Com 810027 8/15/88 REV.
KB-112 RENOTE STATION OPERATION & SERVICE MANUAL Table of Contents Page Section 1 ................ KB-112 the Introduction to I Installation .............................. 3 II III Operation ................................. 4 Parts Listing ............................. 7 IV Technical Theory of Operation ............. 7 V Specifications ............................ 9 VI Figure Figure Figure Figure Figure Figure 1: 2: 3: 4: 5: 6: Illustrations KB-112 Mounting Dimensions ......... Portable Unit Connection .
I. INTRODUCTION TO THE 1B-112 REMOTE SPEAKER STATION The KB-112 is a versatile, singlechannel Remote Station that provides two-way (talk/listen) comCompatible ability. municating the intercoms, Clear-Com all with KB-112 is ideal in places where wearing a headset is not feasible: dressing rooms, security entrances, etc. The KB-112 has a push-to-talk electret mic and a built-in speaker with a wide frequency response.
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.1. INSTALLATION OF THE KB-112 The KB-112 can be mounted in a cutout in any surface, or it can mount Bl ack by 8" a 6" inside (electrical) Box (minimum depth, See figure 1 for dimensions. 3"). The KB-112 connects to the intercom system through its five-screw terminal strip (designated as "TB-i" on the PC Board Lay-Out; see Figure 3). Route two-conductor, shielded cable (i.e. Belden 8762) from the Main Station or Power Supply output connector to the KB-112's location.
111. OPERATING CONTROLS The KB-112 controls are straight-forward and simple to use. Voluse control adjusts The listen-level of the speaker. the The red Call push-button activates the intercom system's Visual SigThe signal renalling circuit. as you press long as mains active you to allows It button. the Call operators of attention the attract who have removed their headsets, by illuminating the Call lights at all stations that are communicating on your channel.
Figure3 KB- 12 PC BOARD LAY-OUT SWITCHING 0 ~~~/. a . E~ R . "C~ 534/ 5 -- 1 l 3-4 - CONTROL kO *,TI SWITCHES ( 2 _ J ~f ~Qa ~ ~~~~~~~S-2'EVRELOGIC' 3-1 -49002$O S~~~~~~~t o, ,, s 2 < "MICUS -53-2 for distant orcIoseuse Sets micgain Distant (high sensitivity) ~~~~~~~~~~~~~~~ON: OFF: Close (lovwsensitivity) 53-3 Remote Control of Mic ...entaryConnect the points of aremote Push-to-Talk button (' on' type) to the top (Comcon) and middle (N.0.
USING THE SPEAKER When the KB-112 is set up for the Normal mode or the Remote Listen mode, its speaker stays "on" so the operator can monitor activity on When the the intercom channel. operator turns on the mic (or if the mic is turned on from a remote location), the speaker automatically shuts off. That activates the Call circuit. Station must be connected to the same channel used by the KB-112. When the KB-112 is set up for the Remote.
e| IV. PARTS LISTING Qty. I Schematic Reference Desig.
works with the Control Logic circuitry in order to operate the analog switches. For this to happen, the dip switches S3-2 and 53-4 This means the should be closed. output of IC3-2 is low. When the P-T-T switch is activated, the output of IC3-2 goes high. This causes the output of IC3-3 to go high, turning on the "mis-on" The high voltage goes to the LED. input of R8, which turns on FET Q2, shutting off amplifier IC2.
VI. 1K-112 SPECIFICATIONS AMPLIFIER DESIGN Solid-state, integrated circuit amps including a mic preamp, speaker power amp, Current-limited with short-circuit logic control circuit. signalling circuit, and reverse polarity protection. MIC PREAMPLIFIER con200-12k Hz, Freq. Response: toured to enhance intelligibility Mic Preamp Gain: 25 dB, low sensitivity 31.5 dB, high sensitivity electret Mic Type: SPEAKER AMPLIFIEU 3" round, 16 ohm Speaker Type: 2 watts into 16 ohms Power Output: 100-15k Hz, ± 3 dB Freq.
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