Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S40COMPONENTS DESCRIPTIONACCESSORY UNIT (X42-3430-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC1 DDS SCLO1 reference signal genera-tionIC2 DDS SCLO2 reference signal genera-tionIC3 DDS SCLO3 signal generationIC4 PLL SCLO1 controlIC5 Bus buffer Level shiftIC6 PLL SCLO2 controlIC7,8 Bus buffer Level shiftIC9 Amplifi er SCIF3 gain adjustmentIC10 Buffer amplifi er SCLO1 reference signal amplifi erIC11,12 5V AVR 5V regulatorIC401 EEPROM Adjustment data record for prese-lectorIC402 Shift registerQ1 : CA1Q2 : CA2Q3 : CB1Q4 : CB2Q5 : CB3Q6 : CB4Q7 : CC1Q8 : CC2IC403 Shift registerQ1 : CC3Q2 : CC4Q3 : CC5Q4 : CC6Q5 : CC7Q6 : CC8Q7 : CC9Q8 : CC10IC404 Shift registerQ1 : CC1Q2 : 1LQ3 : 2LQ4 : 3LQ5 : 4LQ6 : 5LQ7 : 3DBQ8 : 6DBQ1 SwitchingIF switching, ON when mainreceiver is active (when SC08Mis selected)Q2 SwitchingIF switching, ON when subreceiver is active (when SC11S isselected)Q3 SwitchingIF switching, ON when mainreceiver is active (when SC08Mis selected)Q4 SwitchingIF switching, ON when subreceiver is active (when SC11S isselected)Q5 SwitchingIF switching, ON when subreceiver is active (when SC73S isselected)Q7 Amplifi er Common base, for 8MHzQ8 Amplifi er Common base, for 11MHzRef. No. Use/Function Operation/Condition/CompatibilityQ9 SwitchingIF switching, ON when subreceiver is active (when SC73S isselected)Q11 Amplifi er Input amplifi er for 40MHzQ12 Amplifi er Common base, for 73MHzQ14~16 Amplifi er Input amplifi er for 40MHzQ17~ 20 RX mixerReceiving mixerMain receiver:SC08M 73.095MHzSub receiver:SC11S 73.095MHzQ21,22 Switching Power supply control for SCLO1,for 8AQ23~25 Amplifi er DDS output buffer amplifi erQ26,27 Switching Power supply control for SCMIX1,for 14SQ29 Amplifi er Amplifi er for PLL REF (8.4MHz)Q30 Amplifier Amplifier for SCLO3 (10.676MHz)Q31 Switching Scope attenuator: 0dB ONQ32 Switching Scope attenuator: -10dB ONQ33 Switching Scope attenuator: -20dB ONQ37 Switching Scope attenuator: -30dB ONQ38 Amplifi er Amplifi er for loop fi lterQ39 Amplifi er SCIF1 amplifi erQ40 Buffer amplifi er PLL IC f-inQ41 Amplifi er Amplifi er for loop fi lterQ43 Amplifi er Amplifi er for loop fi lterQ44,45 Amplifi er SCIF2 amplifi erQ50,51 Switching 5V switchQ401 Switching Preselector ONQ402 Switching Capacitor switching for BPF(CC1)Q403 Switching Capacitor switching for BPF(CC2)Q404 Switching Capacitor switching for BPF(CC3)Q405 Switching Capacitor switching for BPF(CC4)Q406 Switching Capacitor switching for BPF(CC5)Q407 Switching Capacitor/coil switching for BPF(CB1)Q408 Switching Capacitor switching for BPF(CC6)Q409 Switching Capacitor/coil switching for BPF(CA1)Q410 Switching Capacitor/coil switching for BPF(CB2)Q411 Switching Capacitor/coil switching for BPF(CC7)Q412 Switching Capacitor/coil switching for BPF(CB3)