Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S50COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityD280~288 Protection Surge protectionD360 Reverse voltageprevention Surge protectionCONTROL UNIT (X53-452X-XX)Ref. No. Use/Function Operation/Condition/CompatibilityIC1 1.2V switchingregulatorPower supply for 1.2V(Scope DSP internal (core) sup-ply)IC2 3.3V linear regu-latorPower supply for 3.3V(Main MCU power supply)IC30 Multiplexer For PCB versionIC31~34 Latch IC Extension port of main MCUIC35 Multiplexer For type and PCB versionIC36~39 Latch IC Extension port of main MCUIC40 Level converter(5V3.3V) For external antenna tuner signalIC41 Level converter(3.3V5V) For external antenna tuner signalIC42,43 Latch IC Extension port of main MCUIC44 Reset IC System resetIC45 Level converter(5V3.3V) USB connection detectionIC46 MCU Main MCUIC47 EEPROM EEPROM for backupIC48 Buffer For serial clock and dataIC49 Real time clock Real time clockIC380 MCU Scope DSP-Sub MCUIC381 DSP Scope DSPIC382 A/D converter A/D converter for band scope IFsignalIC384,387 OP amplifi er Active filter for band scope IF sig-nalIC385 OP amplifi er Reference signal for OP amplifi erIC386 A/D converter A/D converter for audio scopesignal (Main RX/ Sub RX)IC388,389 Latch IC Address decoder for scope DSPIC390 Flash memory Program for scope DSPQ380 Switching 3.3V switchQ381 Switching 3.3V switchD1 Switching Catch diode for 1.2V switchingregulatorD30 Reverse currentprevention For standby switch signal (SS)D31 Reverse currentpreventionFor KEY jack judgement signal(KYSR)D32 Reverse currentprevention For real time clock IC powerD380 Reverse currentpreventionFor reduced voltage detection(BKC)DSP UNIT (X53-4530-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC1 1.2V switchingregulatorPower supply for 1.2V(DSP internal (core) Supply)IC50 Phone amplifi er Phone outputIC51 Audio poweramplifi er SP1 (internal SP)/ Ext. SP1IC52 Audio poweramplifi er Ext. SP2IC101 MCU DSP-Sub MCUIC200,201 Latch Address decoder for TXMRX-DSPIC202 DSP TX/Main RX DSPIC203 Flash memory Program for TXMRX-DSPIC300 DSP Sub RX DSPIC301 Flash memory Program for SRX-DSPIC302 Buffer Extension output for SRX-DSPIC322 Inverter X'tal bufferIC380 Flip-fl op A frequency divider for SCLK/LRCKIC381 Buffer Buffer for SCLK48KIC382 Buffer Buffer for LRCK48KIC383 Buffer Buffer for MCLK48KIC385 D/A converter D/A converter for BEEP andMSCPI signalIC386 D/A converter D/A converter for MUANO andSUANO signalIC387 D/A converter D/A converter for MRECI andSRECI signalIC388 D/A converter D/A converter for SAGCV andSSCPI signalIC389 A/D converter A/D converter for MRECO andSRECO signalIC390 D/A converter D/A converter for SP1 and SP2signalIC391 D/A converter D/A converter for MANO andSANO signalIC392 A/D converter A/D converter for SRIF/SFMDand ANI/UANI signalIC397 D/A converter D/A converter for TIF/FMOD andMAGCV signalIC398 A/D converter A/D converter for MRIF/MFMDand MIC signalIC399 NAND gate For SCLK96KIC650 OP amplifi er Active fi lter for SP1 and SP2signalIC651 OP amplifi er Active fi lter for MANO and SANOsignalIC652 OP amplifi er Active fi lter for BEEP signal andreference voltage of OP amplifi erIC653 OP amplifi er Active fi lter for MUANO signalIC654 OP amplifi er Active fi lter for SUANO signal |
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