Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S46COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityD21 VCO frequencycontrol MLO1 VCO3D22 VCO frequencycontrol MLO1 VCO4D23 Switching ON when internal REF is selectedD24 Protection ofreverse current PLL (IC17) lock detectD25 Switching ON when internal REF is selectedD26 Switching ON when VCO3 is operateD27 Switching ON when VCO4 is operateD28 Switching ON when 10MHz REF outputD29 Switching ON when source of MLO1 is DDSD33 Switching ON when source of MLO1 is DDSD34 Protection ofreverse current PLL (IC18) lock detectD37 Switching ON when source of MLO1 is DDSD38 Switching ON when 1/8 divide of VCO oper-ateD39 Switching ON when 1/10 divide of VCOoperateD40 Switching ON when 1/4 divide of VCO oper-ateD41 Switching ON when source of MLO1 is DDSD42 Switching ON when FIL1 of MLO1 operateD43 Switching ON when FIL2 of MLO1 operateD44 Switching ON when FIL3 of MLO1 operateD45 Switching ON when FIL4 of MLO1 operateD46 Switching ON when FIL5 of MLO1 operateD47 Switching ON when FIL6 of MLO1 operateD48 Switching ON when FIL7 of MLO1 operateD49 Doubler Doubler of 20MHzD50 Switching ON when FIL1 of MLO1 operateD51 Switching ON when FIL2 of MLO1 operateD52 Switching ON when FIL3 of MLO1 operateD53 Switching ON when FIL4 of MLO1 operateD54 Switching ON when FIL5 of MLO1 operateD55 Switching ON when FIL6 of MLO1 operateD56 Switching ON when FIL7 of MLO1 operateD57 Voltage shift Dorop input voltage of IC5,IC7PLL (SUB) UNIT (X50-3230-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC1 PLL PLL for 15.6MHz VCXOIC2 5V AVR SL05CIC3 3.3V AVR SL33CRef. No. Use/Function Operation/Condition/CompatibilityIC5 Shift resistorQ1: SLVCO1 “H” when VCO1operateQ2: SLVCO2 “H” when VCO2operateQ3: SLVCO3 “H” when VCO3operateQ4: SLVCO4 “H” when VCO4operateQ5: Not usedQ6: Not usedQ7: SLVB “H” when VCO shiftis ONQ8: TXLO “H” when TXIC6 Shift resistorQ1: Not usedQ2: NFT “L” when FM ModeQ3: SLIFL “L” when IFB is se-lectedQ4: SLIFH “L” when IFA isselectedQ5: SLFIL1 “H” when FIL1 isselectedQ6: SLFIL2 “H” when FIL2 isselectedQ7: SLFIL3 “H” when FIL3 isselectedQ8: SLFIL4 “H” when FIL4 isselectedIC7~9 Level shift of se-rial data 3.3V 5VIC10 PLL PLL for DDS (IC14) REFIC11 DDS DDS for PLL (IC16) referenceIC12 DDS DDS for SLO3IC13 1.8V AVR For DDS (IC14)IC14 DDS DDS for SLO1IC15 Wide band AMP Amplifi es DDS (IC14) outputIC16 PLL PLL for TLO1 VCOIC17 12V AVR ML12CIC18 Buffer of serialdata 3.3V 3.3VIC20 Analog switch Loop fi letr shiftQ1 Buffer PLL (IC1) reference inputQ2 Amplifi er Fin AMP of PLL (IC1)Q3 Amplifi er DDS (IC11) master clock inputQ4 Amplifi er Reference input of PLL (IC10)Q5 Amplifi er DDS (SLO3) master clock inputQ6 SwitchingON when VCO173.125~79.355MHz operateOFF when VCO179.355~87.755MHz operateQ7 SwitchingON when VCO287.755~95.105MHz operateOFF when VCO295.105~103.505MHz operateQ8 Ripple fi lter For TLO1 VCO |
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