Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S41COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ413 Switching Capacitor switching for BPF(CC8)Q414 Switching Capacitor/coil switching for BPF(CA2)Q415 Switching Capacitor switching for BPF(CC9)Q416 Switching Capacitor/coil switching for BPF(CB4)Q417 Switching Capacitor switching for BPF(CC10)Q418 Switching Capacitor switching for BPF(CC11)Q419 Switching Scope attenuator: 9dB ONQ420 Switching Scope attenuator: 6dB ONQ421 Switching Scope attenuator: 3dB ONQ422 Switching Scope attenuator: 9dB ONQ423 Switching Coil switching for BPF (1L)Q424 Switching Coil switching for BPF (2L)Q425 Switching Coil switching for BPF (3L)Q426 Switching Preselector ONQ427 Switching Coil switching for BPF (4L)Q428 Switching Coil switching for BPF (5L)Q430 Switching Preselector OND1 Frequency control VCO for SCL01D2 Switching ON when main receiver is active(when SC08M is selected)D3 Switching ON when sub receiver is active(when SC11S is selected)D4 Switching ON when sub receiver is active(when SC73S is selected)D8 Switching ON when receiver is activeD9 Reverse currentprevention SEL12 control lineD10 ~13 RF switching SCIF1 attenuatorD14 Reverse currentprevention SCPUL control lineD15 VCO tuning Variable capacitance for SCLO1tuningD16 ~119 RF switching SCIF1 attenuatorD20,21 RX mixerRX MixerON when main receiver is active:73.095MHz 10.7MHzD23 VCO tuning Variable capacitance for SCLO2tuningD24,25 RX mixerRX MixerON when main receiver is active:10.7MHz 24kHzD26 Switching Scope OND401~417 Surg absorption Relay (K401-417)D418 Reverse currentprevention 3DB/6DB control lineRef. No. Use/Function Operation/Condition/CompatibilityD419~421 RF switching Preselector attenuatorD422 Surge absorption Relay (K418)D423~425 RF switching Preselector attenuatorD426 Surg absorption Relay (K419)D427 Surg absorption Relay (K420)D428 Surg absorption Relay (K422)D429 Surge absorption Relay (K421)D430 Surge absorption Relay (K423)D431 Surge absorption Relay (K424)D601~603 Reverse currentprevention for phone jack dataD607,608 Surge protection for USB universal serial dataD609 LED (Green) Key backlightD610 LED (Yellow) Key backlightD611,612 LED (Green) Key backlightD613 LED (Yellow) Multi encoderDC-DC UNIT (X43-3220-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC20 Voltage detactor 14V line voltageIC21 Delayed D-type fl ip-fl opIC22 Bus buffer 14V Voltage detect signal lineIC23 Voltage detactor Voltage detection (BU5V)IC24 AND gate BKC lineIC40 3.3V AVR 3.3V regulatorIC50 Analog switch Fun speed or thermistor voltageselectIC100 DC/DC converter 8V switching regulatorIC120 DC/DC converter 5V switching regulatorIC140 DC/DC converter 3.3V switching regulatorIC200 RS-232C driver RS-232C level converterIC803 DC/DC converter 1.8V switching regulatorIC804 DC/DC converter 1.2V switching regulatorQ1,2 Switching 14S power supply switchQ20 Switching Over voltageQ160,161 Switching 33S power supply switchQ270~272 Switching Multi vibrator for -12VQ807,808 Switching 1.8V power supply switchD1 Reverse currentpreventionFrom signal revolution pulse offanD2 Overvoltage pro-tectionFrom signal revolution pulse offanD20 Zener diode Voltage dropD21 Zener diode Over voltage protectionD40 Reverse currentprevention From BU5V power supply |
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