Sharp_CB-2170_Service_Manual维修手册含电器原理图

SHARPSERVICE MANUALOUTSTANDING RECEPTION THE WORLD OVERSYNTHESIZED 40 CHANNELCITIZENS BAND TRANSCEIVERMODELCB-2170WANINGThis model CB-2170 is almost the same as the model CB-4370wtul for thece the transmitter by any one other thaexcept for the channel display circuit and some external partsAs to the descriptions about "Trouble Shooting Guide'"Cautions on Handling MOS IC"and"Equivalent Circuit of IC'refer to the Service Manual for the MODELCB-4370.SPECIFICATIONSTransmitter sectionCircuit type.........Dual conversion superheterodyne:RF power output4W (maximum)Phase Locked Loop (P.L.L.)fre-Frequency range…27MHz Citizens Bandquency synthesizer provides 40Channels40 chs.P.L.L.(Phase Locked Loop)transmit and receive channels.circuit SynthesizerDelta tuning of t1.0kHz on eachType of crystal.…HC-18Uchannels plus ceramic filter.ToleranceAuxiliary circuits .........Automatic noise limiter (ANL).10.240MHz.·......±0.003%Variable squelchTransmitter modulation...100%(maximum)Public Address System(P.A.)Modulation limiter........Yields high average modulation ataverage voice levelsGeneralAntenna matching.........Nominal 50 ohmsPower source.......DC 12.0V NominalCarrier deviation.............Not greater than+800Hznegative or positive groundnominal on (exceeds F.C.C.,Antenna.................50 ohm external antenna for car or baseD.O.C.,etc.requirements)operationHarmonic suppression.Exceeds 60dBSpeaker.3-108"P.D.S.8-ohm Imp.Receiver sectionMicrophone.....Press-to-talk dynamic microphoneAudio power output......3.5 Watts maximum power output(500ohm)Sensitivity..........0.5uV/m for 10dB S+N/N ratioAccessories.Microphone hangerat 30%at 1000Hz modulationMobile mounting bracketChannels....4 chs.P.L.L.(Phase Locked Loop)Mounting screwscircuit SynthesizerMicrophone with plug and cord.Type of crystal....HC-18UPower supply cord with fuse holder and11.150MHz,,.±0.003%socket.Selectivity6dB down at3kHz;Spare fuse (2.3A)60 dB down at±10kHzDimensions......217/32"(HD×6-11/16(wM×Intermediate frequency...Ist-IF:10.695 MHz,7-9/16”(D)2nd-IF:455kHzWeight.…3.6 Ibs.without microphoneCabinet...Metal body with plastic frontSHARP ELECTRONICS CORPORATIONExecutive Office:10 Keystone Place,Paramus,New Jersey07652(201)265-5600Regional Offices Distribution Centers:10 Keystone PlaceParamus,New Jersey07652(201)265-560021580 Wilmington Ave.,Long BeachCalif.90810(213)830-4470U.S.Subsidiary of Sharp Corporation,Osaka,JapanParts Centers:P.0.BoX664Paramus,New Jersey07652(201)265-5600P.0.Bo×20394Long Beach,Calif.90801(213)830-4470