KENWOOD–TS-850-维修电器原理图手册-2

TS-850SDESCRIPTION OF COMPONENTSRF UNIT(X44-3120-00)Ref.No.Use/FunctionOperation/Condition/CompatibilityQ1RX RF amplifier22-30MHz02.3RX RF amplifier22MHz or lessQ4DC switchK4 control05TX RF amplifierDrive outputQ6.7DC switchQ8-11RX 1st mixerfRx 73.05MHzQ12Ripple filterQ13IF amplifier73.05MHzQ14Buffer015Mixer73.05MHz-8.83MHz for monitorQ16.17RX 2nd mixer73.05MHz+8.83MHzQ18RF amplifierNB RF outputQ19DC switchNB gateQ20TX IF amplifier8.83MHzQ21RF amplifierFor monitor,8.83MHzQ22DC switchQ23.24TX 2nd mixer8.83MHz+73.05MHzQ26.27TX 3rd mixer73.05MHz -fTxQ28RF amplifier1st local amplifierQ29DC LPFACL keyingQ30.31DC switchOn when ARPD or PT or TPD are "H"032DC switchOn when S1 is on or BPD is "H"and Q30 is off033DC switchOn when PDE is "L"Q34DC switchOn when 031 is cnQ35DC switchOn when TPD is on036-38DC amplifierALC amplifier039DC amplifierSWR protectionQ40.41DC amplifierALC amplifierQ42DC switchQ43DC switchTXB -RLQ45-48DC switchQ49RF switchiOPn when TXQ50DC switchOn when PDE is "L"Q51DC switchOn when Q50 is onQ52OC switchOn when Q45 is on and Q51 is offQ501AF switchOn when VOB is“HQ502OC switchOn when VOB is "H"Q503AF switchOn when VOA is "H"and VOB is"L"Q601-603RF amplifier8.83MHz NBC604DC amplifierNB AGCQ605DC switchOn at noise puise (NB1,N821Q606DC switchOn at noise puise (NB2)Q607DC switchCn at noise pulse (NB1.N82]Q608DC switchCn at noise puise (N旧2Q609AF amplifierFM microphone amplifierQ610Af switchFM microphone muteQ611DC switchOn when 0612 is onQ612DC switchOn when 0613 is offQ613DC switchOn when NFB is"H"36