Telex BTR-200 Series manual TRANSMIT, Receive & Audio CIRCUIT,BOARDS

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CHAPTER 3

TRANSMIT, RECEIVE & AUDIO CIRCUIT,BOARDS

BTR-200 INSTRUMENT

DISASSEMBLY

1.Remove 6 each #6 pan head phillips and 7 each #14 head phillips screws and remove cover. Refer to Figure 8.

2.Unsolder coax cables from transmit and receive boards.

3.Unsolder 3 copper straps from receive board (if present)

4.Remove transmit and receive boards. Early versions are equipped with snap-on nylon stan- doffs and later versions are held with #4 pan head phillips screws.

5.Remove ring nuts from the two RF connectors.

o 6. Remove the hex head nylon screw and nut holding Q108 to the chassis.

7.Remove 8 each #4 flat head phillips screws holding the four XLR connectorhousings to the chassis. On some early versions, the upper PEM nuts will be replaced with nuts and lock- washers.

8.Using an XLR tool or small flat bladed screwdriver, unlock the XLR housings by turn- ing the locking screw counterclockwise. Then remove the XLR housings by pulling them to the rear.

9.Unplug the cable harness at P1l4 and the two ribbon cables at P102 and P103.

10.Remove 10 each #6 pan head phillips screws holding the circuit board to the chassis.

11.Slide the circuit board forward and lift up and out from the rear.

12.Remove 8 each #6 pan head phillips screws holding front panel to chassis.

13.Remove 2 each #4 pan head phillips screws holding headset connector bracket to chassis and remove front panel.

14.Remove 7 each phillips sorews holding front circuit board to front panel and remove circuit board. NOTE: When refitting this circuit board the volume control on the front panel must be positioned so that the pins and slots mate properly.

15. Reassembly is the reverse of these procedures.

3-1

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Contents ~iDD ~~~ EnWTable of Contents Description · Transmit, Receive & Audio Circuit BoardsChapter Controls and Connections MIC on PUSIH-lO-TALKI 27160-8-00I-AFront Panel-BTR200 Speaker / Local Monitor 8 n MIN 27160-B-002-ARear Panel BTR-200 Rear Panel Refer to Figure Location of Rev Level for Versions 3 thru Location of Rev Level for Versions 1Receive Board Transmit Board Exploded View· BTR-200 Mechanical PartsPlaces TRANSMIT, Receive & Audio CIRCUIT,BOARDS Transmit Board U501 Device 1====-r===r===r====jPI=N=N=U=rM=B=EFR==~===r==~==l1Q50l Q502 Q503 ~@C501 +~04Transmit Board Component Layout Foil Side Transmit Board Component Layout Component SideQ503~502 100P~ Schematic Diagram Transmit Board VersionPCB Transmit Assembly Receive Board Receive Board Receive Board Page Page Q309, Q311 Q301Q302 Q303 Q304 Q311 U304 U306 U309U303 U305 U307 U310 550 234 Voltage Tables· Receive Board Voltage Tables Receiv~ Board876 U302 123Lp~lr ~ ~ FL30~368@@R33~@R334@ a ~050~~VC303 Schematic Diagram Receive Board Version 1 PCB AssemblyReceive Board Componen~Layout Foil Side I6i?7L4~ Receive Board Component Layout Component Side VersionFrequency Dependent Components Table CJl~VOBPCB Receive Assembly PCB Receive Assembly PCB Receive Assembly 878522M VC301-VC308 GAASFET, NE PCB Receive Assembly Microphone Amplifier Receive ExpandersAuxiliary Input Amplifier Intercom DriverIntercom Input Power SupplyHeadset and Speaker Amplifiers Transmit Mixer and Filter29/3-30 Blank Block Diagram Versions 1 ToI ~OEg+0 Rl~63 jRl02 +0 0+Ov· \.AJAudio Board Component Layout Foil Side Versions 1 ~R17J UrIR1,~ Schematic Diagram Audio Board VersionHEAO~.~22C113Jo ~C-\1ilBlI.0U~r.VY..,R137Details of Board Differences Between Versions 1 LI~-.=Joqa ~.C·@5ItDCD R182 C142 ~lll ~S~!~~0113 CJC~5 +~87Versions 3, 4, Audio Board Component Layout Foil SideC2~~~R230-------L.jN,-.L!~2.-.L-.-H ~I~ ~4~ ~4S~B~~9 R21~1Daoa ~EM32 CI6~~~Ms~ ~ R224 E I fJJ~FC117H!f-V1\M,pI~£.jl,ltI1Ir-1N+--J ~1~1~2 +lQJl~i ~IR~~~~199r~PCB Audio Assembly, 878520 Versions 1 thru Rln·2 Rln36 PCB Audio Assembly 878520 Versions 1 thruTioi Display Board Component Layout Component View Display Board Component Layout Foil SideTELEX@

BTR-200 Series specifications

The Telex BTR-200 Series is a well-regarded solution in the realm of wireless intercom systems, widely utilized in broadcast, film, and live event production settings. Renowned for its reliability, user-friendly interface, and robust performance, the BTR-200 Series has become a staple for professionals seeking efficient communication solutions.

One of the standout features of the BTR-200 Series is its frequency agility. The system operates in the UHF band, allowing users to switch frequencies to avoid interference from other wireless devices. This adaptability is crucial in environments where multiple wireless systems operate simultaneously. Users can easily reprogram frequencies to ensure clear and uninterrupted communication among team members.

Another key characteristic of the BTR-200 Series is its impressive range. The systems can provide coverage up to 1,000 feet in line-of-sight applications, making it suitable for large venues. This extensive range ensures that communication remains intact even in expansive settings, such as concert halls or outdoor arenas. Additionally, the enhanced RF performance ensures minimal dropouts, contributing to seamless communication.

The BTR-200 Series also distinguishes itself with its digital circuitry, which enhances audio clarity and reduces noise. This reliance on advanced technology results in crisp communication that is essential for coordinating complex productions. The system also features a low-latency design, which is particularly valuable in live performance settings where timing is crucial.

In terms of user interface, the BTR-200 Series is engineered with simplicity in mind. The beltpack units and base station feature intuitive controls that enable quick adjustments, making them easy to operate even under the pressures of a production environment. Each beltpack supports individual volume control, allowing users to customize their audio experience according to their preference.

Moreover, the BTR-200 Series is built for durability and long-lasting operation. The robust construction of its components ensures reliability, even in challenging environments. Rechargeable batteries offer extended operating time while reducing the need for constant replacements.

In summary, the Telex BTR-200 Series stands out for its frequency agility, extensive range, digital audio clarity, user-friendly interface, and durable build quality. These features combined make it an ideal choice for professionals in the broadcasting and live event production industries, promoting seamless and efficient communication essential for successful operations. The BTR-200 Series remains a trusted solution, proving its worth time and again in various high-pressure scenarios.