Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S57COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ358 Switching ON when Sub RX 1st IF of11.374MHz is selectedQ401~404 Sub RX 1st mixer Sub receiving 1st mixer(HF>73.095MHz)Q405,406 Amplifi er Sub RX SLO1 amplifi er (Sub RX1st IF of 73.095MHz is selected)Q408 Amplifi er Sub RX 1st IF amplifi er (Sub RX1st IF of 73.095MHz is selected)Q409 SwitchingGain correction between 1st IF(ON when TX or sub RX 1st IF of73.095MHz are selected)Q410 Amplifi erSLO2 Amplifi er(ON when TX or sub RX 1st IF of73.095MHz are selected)Q481 Amplifi er Sub RX 2nd IF amplifi er 1(10.695MHz/11.374MHz)Q482 Switching OFF when SBLNK signal is “H”Q483 Switching ON when SBLNK signal is “H”Q484 Switching ON when 11.374MHz 2.7kHz IFfi lter is selectedQ485 Switching ON when 10.695MHz 2.7kHz IFfi lter is selectedQ486 Switching ON when 11.374MHz 2.7kHz IFfi lter is selectedQ487 Switching ON when 500Hz IF filter is select-edQ488 Switching ON when 15kHz IF fi lter is se-lectedQ489 Switching ON when 6kHz IF fi lter is se-lectedQ490 Switching ON when 10.695MHz 2.7kHz IFfi lter is selectedQ491 Amplifi erSub RX AGC amplifi er(10.695MHz/11.374MHz)Gain is controlled according tothe SAGCV voltageQ492 SwitchingGain correction between bands(ON when sub receiveing21.5~30MHz and preamplifi er isON)Q493 SwitchingGain correction between bands(ON when sub receiveing30~60MHz and preamplifi er isON)Q494,495 Amplifi er Sub RX 2nd IF amplifi er 2(10.695MHz/11.374MHz)Q601 Amplifi erSLO3 amplifi er (ON when subRX SSB, AM and CW mode areselected)Q602 Switching ON when FM 455kHz 12kHz fi lteris selectedQ603 Switching ON when FM 455kHz 9kHz fi lteris selectedRef. No. Use/Function Operation/Condition/CompatibilityQ604 SwitchingSub receiver output, FM (AF) andSSB/AM/CW (IF) changeovermultipulexer (IC604) controlQ701 SwitchingPower supply control of FM circuit(ON when TX FM mode is se-lected)Q702 Buffer TX IF Buffer (10.695MHz)Q703 Amplifi er TX IF amplifi er (10.695MHz)Q704 Switching Transmission IF mute control(Mute when ON)Q705 Amplifi er TX IF amplifi er (73.095MHz)Q706 Amplifi erTX IF amplifi er (73.095MHz)Gain is controlled according tothe ALC voltageQ707 Amplifi er TX drive output amplifi erQ708 Switching ON when drive output is selectedQ709 Switching ON when ANT connector outputis selectedQ710 SwitchingPower supply control of TXB to fi -nal unit (X45 A/2) (ON when ANTconnector output is selected)Q801 Switching On in AM mode, makes it anaverage value type ALCQ802,803 Amplifi er ALC amplifi erQ806,807 SwitchingCancels the time constant forVSF and VSR voltage lines dur-ing antenna tuningQ881 Buffer Noise blanker input bufferQ882 Amplifi er Noise blanker IF amplifi er 1(10.695M/11.374MHz)Q883,884 Amplifi erNoise blanker IF amplifi er 2(10.695M/11.374MHz)Gain is controlled according tothe NB voltageQ885 Switching ON when IF of 10.695MHz isselectedQ886,887 Amplifi erNoise blanker IF amplifi er 3(10.695M/11.374MHz)Gain is controlled according tothe NB voltageQ888 Switching ON when IF of 10.695MHz isselectedQ889 Amplifi er Noise blanker AGC control ampli-fi erQ890 Amplifi erNoise blanker IF amplifi er 4(10.695M/11.374MHz)Gain is controlled according tothe NB voltageQ891 Switching ON when IF of 10.695MHz isselectedQ892 Switching Audio mute signal is generatedQ893 Buffer Noise blanker IF bufferQ894 Switching Audio mute signal is generated |
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