Kenwood TS-770 Service Manual

Also see for TS-770: Service manual Operating manual

CONTENTS/FEATURESFEATURES ......CIRCUIT DESCRIPTION ... z see 8SEMICONDUCTOR/FILTER DATA . ee AS:OPTION(BU-1).. 16OUTSIDE VIEWS 7PACKING 19PARTS LIST sacssesssseessneeeseeee 20BLOCK DIAGRAM .....ccsseessee sbxssiikistbadied APC BOARD VIEWS...FEATURES144/430 MHz, all mode (FM, SSB (USB. LSB), CW)transceiver.MicroprocessorcontrolledVFOandfullvarietyof aux-iaryfunctions.FM circuitry based on KENWOOD’s advanced technologyand outstanding SSB qualityBuilt-in VOXBuilt-in side tone and CW circuitry capable of semi-break-in operation.Easy-to-operate 1 band, 1 MHz VFO stops at 999.98 kHzor is continuously adjustable (endless system).Built-in digital display that indicates operating frequencyin all modes.Digitaldisplayequippedwitheasy-to-read greenphosphortubes.7-digitdigitaldisplaythatdirectlyreadsdownto100HzFrequencyindicator thatreadsoutcarrierpositionswhenmodeofoperationischanged.Indicatesfixedchannel(storesanygivenfrequency)andcallchannelfrequencies,besidesVFOAand Bfrequen-ciesDigitaldisplay indicateswhichVFO(AorB)isinuse,fix-edchannelnumbers(1through8).The use of display select circuit turns off the 100 Hzdigits in FM mode.Dependable electrical and mechanical functions.VFO frequencies are switchable in 2 speeds. SLOW (in20 Hz steps) and FAST (in 200 Hz steps).VFO knob equipped with variable torque mechanism.Pushbutton band select switches (UP and DOWN) thatshift up and shift down frequency between 144 MHz and440 MHz in 12 bands at 1 MHz intervals.Wide band design for both transmitter and receiver thateliminates the need for tuning the RF circuits.DISASSEMBLY.TROUBLE SHOOTINGADJUSTMENTS.sheetedbeatersoeLEVELDIAGRAM...sauscsioneoassiosieseu1GCIRCUITDIAGRAM...seactiveaeee-.80REFERENCEDATAeeae84MEMO.........ttecones86SPECIFICATIONG.........i89'® Panel layout based on human engineering.‘© Full variety of indicating functions to check operatingconditions (Pilot lamps: ON AIR, Hi/LOW (FM transmit),F-LOCK, RIT. SLOW/FAST, Back-up power ON/OFF).© Amplified type AGC and ALC circuits that maintainreceive and transmit outputs at constant level withoutdistortion.4. A multitude of auxiliary functions for more enjoyableoperation‘© The use of RAM memory system microprocessor enablesany given frequencies to be stored in or cleared from fix-ed channels (8 CH).@ Built-in back-up power circuit to keep data stored at allin scan and search circuits.© RIT circuit functions on VFO, fixed channels and callchannel.© Adoption of frequency lock circuit.@ KENWOOD's unique noise blanker (NB) circuit toeliminate pulse type noise.‘© Equipped with two meters, one is an "S” meter (withRF/ALC selector) and the other is a center meter for useon FM.© RF power HIGH/LOW selecting function provides con-venience in transmission with local stations.Auxiliary (AUX) socket.Designed for fixed and mobile station services.AC/DC 2-way power operation.Equipped with a grip for carrying convenienceSufficient AF output power (2.5W/40).Built-in large sized speaker (7.5 cm).connecting jack.eocon External speaker