Kenwood TK-940 service manual

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Contents FX-R%~?ONIT1x57-4590-XXI BIZ $@$, ~\, !? .- $LU~CO .i@&4170-XXGeneral TestingInstallation Planning Control Stations 5-1. Antenna system DC Power and wiringAntenna RadioSystem SET-UP Operating Features Scan indicator Front Panel Displays and Indicators System displayDelete 1 indicator Busy indicatorDetails of Features TEL ID Codes TEL Mode Time-Out TimerSystemIGroup Revert Last call revertSystem Search Free System RingbackTranspond Preferred System RevertAuto TEL Delay toneAudible User Feedback Tones Proceed toneCall indicator, alert tone Transmit disable receive-only channelsConventional System Operation Talk-aroundNon-continuous Horn AlertContinuous System Scan Type Fix system scanTransceiver Programming Data Program ModeIr 4-1.lntroduction KPG-4 Description Optional PC programming interface cableDealer mode Clone Mode FigureDescription of Each Modes System keyVolume key Panel Tuning ModeGroup key Scan keyKDD-4assembly Installing the Signaling Unit KDD-4 Dtmf OptionInstalling the KDD-4 in the transceiver InstallationJumper setup charts Accessory Connection Cable KCT-19 OptionMonireset ON-HOOK OFF-HOOK JU2 JU3 JUJ Mute UrimuteGND Terminal functionR5 and R6 setup chart Connecting the KCT-18 to the transceiverIgnition Sense Cable KCT-18 Option Modifying the transceiverExternal Speaker Connection procedureKES-3 Option KES-4 OptionFitting the Control Panel Upside Down Page Page Page Page If unit RF unitMCF ANT AMP If System -AMPSP PLL MIC AMPAudio amplifier unit Squelch circuit Microphone amplifier Buff IRF AMP PLLVcxo DET InvswControl unit PLL data output Power supply circuitHorn control Power switch circuit LCD AssemblyCPU Tone generatorTerminal connection diagram Block diagramEeprom AT24C02NlOS12.7 TX-RX Unit IC201 Terminal connection diagram Terminal functionTest DEC DINMicroprocessor 78312AGF3563BE TX-RX Unit IC209 Microprocessor 75308BGK740BE9 LCD Assy IC2 Output a CLKTEST2 TEST1 Eeprom NJM78L05UADTA114EU--DC DTA114YULCD Assy B38-0731-05 Rating wattage Cc4riqKusa TK-940/941Insulating Tube ANT Cable Speaker 16 QHM 1W Micrqphqnb Tapttte Screw A T Head T a P T T I E Sciiewpannel Screw SETY4U Icpqwer Modulej .. Drive TX-RXW w w W W 1 W l Uuupi I P C X E D CU U P F U P FR c Hesbnatuh ES $j Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Pattern Page Foil side IC20E Dtci 14EU DTCI44EU Page Page Component side PC Board View ~ o h ~ o n esident Page TX-RX Unit TX-RX Section X57 4590 XX A/2 11 TK A1 PLL O w m o d +4- aLIE- - aIz23z= Page Ccrl--------ASSYDISPLAY S~ECTION838 Eqqzj

TK-940 specifications

The Kenwood TK-940 is a highly regarded mobile two-way radio that has earned a reputation for its ruggedness, reliability, and excellent communication capabilities. Designed for professionals in various sectors such as public safety, transportation, and construction, the TK-940 incorporates advanced technologies to meet the demanding needs of users in the field.

One of the standout features of the TK-940 is its robust design, which complies with military specifications for durability. Its construction allows it to withstand harsh environmental conditions, making it suitable for outdoor and challenging work environments. The radio is also equipped with a water-resistant casing, ensuring that it can function reliably even in wet conditions.

The TK-940 operates in the VHF frequency range, providing wide coverage and strong signal penetration. With a power output of up to 110 watts, users can achieve long-range communication, essential for coordinating activities over large areas. The radio supports both analog and digital modes, allowing seamless integration into various communication systems while maintaining high audio clarity.

Another significant feature of the TK-940 is its enhanced audio quality. The radio is equipped with Kenwood's advanced noise cancellation technology, which minimizes background noise and ensures clear voice communication even in noisy environments. The audio output is powerful and adjustable, catering to individual user preferences.

Moreover, the TK-940 supports a variety of signaling options, includingDTMF, MDC-1200, and 2-Tone/5-Tone signaling, facilitating efficient communication. These signaling features enhance interoperability with other communication devices and systems, allowing users to communicate seamlessly with teams or dispatch centers.

Kenwood has also incorporated user-friendly functionalities into the TK-940. It boasts an intuitive user interface with programmable buttons, enabling quick access to essential features. The large, backlit display provides clear visibility and is easy to read in various lighting conditions.

The TK-940 is designed with safety in mind, featuring emergency alerts and lone worker protection, ensuring users can communicate their status in critical situations. Overall, the Kenwood TK-940 is a powerful and versatile mobile radio that combines durability, advanced technology, and user-friendly features, making it an ideal choice for professionals who require reliable communication in the field.
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