Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S47COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ9 SwitchingON when VCO173.125~79.355MHz operateOFF when VCO179.355~87.755MHz operateQ10 SwitchingON when VCO287.755~95.105MHz operateOFF when VCO295.105~103.505MHz operateQ11 Amplifi er Fin AMP of PLL (IC10)Q12 Ripple fi lter For DDS REF VCOQ13 Oscillate VCXO 15.6MHz VCXOQ14 Switching ON when VCO1 operateQ15 Switching ON when VCO2 operateQ16 Oscillate VCO DDS REF VCOQ17 Oscillate VCO VCO1Q18 Oscillate VCO VCO2Q19 Buffer Buffer of 15.6MHz VCXO outputQ20 Buffer Buffer of DDS (IC11) outputQ21 Switching ON when except FM modeOFF when FM modeQ23 Amplifi er DDS (IC14) master clock inputQ24 Amplifi er DDS REF VCOQ25 Buffer Buffer of 15.6MHz signalQ26 SwitchingON when VCO3103.505~112.54MHz operateOFF when VCO3112.54~120.94MHz operateQ27 SwitchingON when VCO4120.94~128.29MHz operateOFF when VCO4128.29~133.095MHz operateQ28 Buffer/Amplifi er Buffer/Amplifi er of TLO1 refer-ence signalQ29 Buffer Buffer of PLL (IC16) referencesignalQ30,31 Switching Power supply SW of D25,D56Q32 SwitchingON when VCO3103.505~112.54MHz operateOFF when VCO3112.54~120.94MHz operateQ33 SwitchingON when VCO4120.94~128.29MHz operateOFF when VCO4128.29~133.095MHz operateQ34 Doubler Doubler of 15.6MHz VCXO signalQ35,36 Switching Power supply SW of D16, D52,D56, Q57 (SLO2 output)Q37 Switching ON when VCO3 operateQ38 Switching ON when VCO4 operateQ39 Oscillate VCO VCO3Q40 Oscillate VCO VCO4Ref. No. Use/Function Operation/Condition/CompatibilityQ41,42 Switching Power supply SW of D20, D23,D30, D35, D40, D43, D47Q43,44 Switching Power supply SW of D20, D24,D28, D34, D46Q45,46 Switching Power supply SW of D24, D29,D33, D45Q47,48 Switching Power supply SW of D21, D36,D53, D32, D44Q49 Amplifi er PLL (IC16) reference inputQ50 Doubler Doubler of 31.2MHz signalQ51 Amplifi er TLO1 VCOQ52 Doubler Doubler of 31.2MHz signalQ53 SwitchingTLO1 PLL loop fi lterON when except FM modeOFF when FM modeQ54,55 Switching TLO1 PLL loop fi lterQ56 Amplifi er TLO1 outputQ57 Amplifi er SLO2 outputQ58 Ripple fi lter For PLL (IC16) loop fi lter, VCOshift SWQ59 Switching Power supply SW of D48, D49ON when VCO1 or VCO2 operateQ60 Amplifi er Fin AMP of TLO1 PLLQ61 Amplifi er SLO1 (IFA) outputQ62 Switching Power supply SW of D50, D51ON when BPF1 or BPF2 operateQ63 Switching ON when FM modeOFF when except FM modeQ64 Switching ON when except FM modeOFF when FM modeQ65 Switching ON when FM modeOFF when except FM modeQ66 Ripple fi lter For 15.6MHz VCXO, doubler(15.6 31.2M, 31.2 62.4M)Q68 Switching Power supply SW of amplifi erD2 VCO frequencycontrol TLO1 VCO1D3 VCO frequencycontrol TLO1 VCO2D4 VCXO frequencycontrol 15.6MHz VCXOD5 VCO frequencycontrol DDS REF VCOD6 VCO frequencyshift TLO1 VCO1D7 VCO frequencyshift TLO1 VCO2D8 VCO frequencycontrol DDS REF VCOD9 Switching ON when VCO1 is operateD10 Switching ON when VCO2 is operateD11 FM modulation Operate when FM mode |
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