Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S44COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ702 Switch USB audio device active signalswitchQ703 Switch USB device power supply controlswitchQ803 Power switch Power supply control for digital3.3VQ804 Switch Q803 ON/OFF switchQ805 Power switch Power supply control for 3.3V ofUSB PHYQ806 Switch Q805 ON/OFF switchQ808 Power switch Power supply control for 3.3V ofADCQ809 Switch Q808 ON/OFF switchD1 Reverse currentpreventionReduced voltage detection inter-ruptD402~406 Protection Surge protectD420~422 Protection Surge protectD601~604 Protection Surge protectD701 Protection Surge protectD702 Reverse currentprevention For IC708,709 input linePLL (MAIN) UNIT (X50-3220-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC2 PLL PLL for DDS (IC3) REFIC3 DDS DDS for MLO1IC4 Level Shift of se-rial data 3.3V 5VIC5 5V AVR ML05CIC6 3.3V AVR For 19.2MHz TCXOIC7 3.3V AVR ML33CIC8 1.8V AVR For MLO1 DDSIC9 Wide band AMP Amplifi es MLO1 DDS outputIC10,11 Level shift of se-rial data 3.3V 5VIC12 OP amplifi er Control AGC AMPIC13 DDS Internal REF frequencyIC14 Comparator Detect of 10MHz REF inputIC15 Shift resistorQ1: MLVCO1 “H” when VCO1operateQ2: MLVCO2 “H” when VCO2operateQ3: MLVCO3 “H” when VCO3operateQ4: MLVCO4 “H” when VCO4operateQ5: MLDI “H” when 1/10 divideoperateRef. No. Use/Function Operation/Condition/CompatibilityIC15 Shift resistorQ6: MLDIV2 “H” when 1/4 or1/8 divide operateQ7: MLDIV3 “H” when 1/8divide operateQ8: MLDDS0“H” when DDS output used directas MLO1“H” when DDS output used PLLreferenceIC16 Shift resistorQ1: MLFIL1 “H” when FIL1operateQ2: MLFIL2 “H” when FIL2operateQ3: MLFIL3 “H” when FIL3operateQ4: MLFIL4 “H” when FIL4operateQ5: MLFIL5 “H” when FIL5operateQ6: MLFIL6 “H” when FIL6operateQ7: MLFIL7 “H” when FIL7operateQ8: MDIV2O “H” when 1/4divide operateIC17 PLL PLL for MLO1 VCOIC18 PLL PLL for 20MHz VCXOIC19 Flip-fl op 1/2 divideIC20 Counter 1/5 divideIC21,22 Flip-fl op 1/2 divideIC23 Buffer For MLO1 DDS outputIC24,25 Flip-fl op 1/2 divideIC26 DDS DDS for MLO2IC27 12V AVR ML12CIC28 Buffer of serialdata 3.3V 3.3VQ1 Amplifi er DDS (IC3) master clock inputQ2 Ripple fi lter For DDS REF VCOQ3 Amplifi er Reference input of PLL (IC2)Q4 Oscillate VCO DDS (IC3) REF VCOQ5 Amplifi er Operate when external 10MHzREF is selectedQ6 Amplifi er DDS REF VCOQ8 Amplifi er Fin AMP of PLL (IC2)Q9 Amplifi er Operate when detect of 10MHzREF intput enableQ10 Amplifi er DDS (IC13) master clock InputQ11 Amplifi er AGC AMP of 10MHz REF inputQ12 Switching ON when source of MLO1 is VCOQ13,14 Switching Power supply SW of D12Q17,18 Switching MLO1 PLL loop fi lterQ19 Ripple fi lter For MLO1 VCO |
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