Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S51COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityIC655 OP amplifi er Active fi lter for SRECI signalIC656 OP amplifi er Active fi lter for SSCPI signalIC657 OP amplifi er Active fi lter for SANO signalIC658 D/A converter D/A converter for electronic vol-ume IC controlIC659 OP amplifi er Active fi lter for MANO signalIC660 OP amplifi er Active fi lter for SP1 signalIC661 OP amplifi er Active fi lter for SP2 signalIC662 OP amplifi er Buffer for SAGCV signal andreference voltage of OP amplifi erIC663 OP amplifi er Active fi lter for MRECI signalIC664 OP amplifi er withelectronic volumeElectronic volume for MIXSP1and MIXSP2 signalIC665 OP amplifi er withelectronic volumeElectronic volume for SP1 andSP2 signalIC666 OP amplifi er Active fi lter for MIC signalIC667 OP amplifi er Active fi lter for MRIF/MFMD sig-nalIC668 OP amplifi er Active fi lter for TIF/FMOD signalIC669 OP amplifi er Active fi lter for MSCPI signalIC670 OP amplifi er Active fi lter for SRIF/SFMD signalIC671 OP amplifi er Active fi lter for SP1 and SP2signal (phone line)IC672 OP amplifi er Active fi lter for ANI/UANI signalIC673 OP amplifi erAdditional curcuit for SP1/BEEP/MIXSP2 and SP2/BEEP/MIXSP1signalIC674 OP amplifi er Active fi lter for MIC signalIC675 OP amplifi er Active fi lter for MRIF/MFMD sig-nalIC678 OP amplifi er Active fi lter for SRIF/SFMD signalIC679 OP amplifi er Active fi lter for TIF/FMOD signalIC681 OP amplifi er Buffer for MAGCV signal andreference voltage of OP amplifi erIC682 OP amplifi er Active fi lter for ANI/UANI signalIC683 OP amplifi er Amplifi er for MIC signalIC684 Analog switch Select signal (ANI or UANI) forADC inputIC685 OP amplifi er Active fi lter for ANI signalIC686 Analog switch Select output line (TIF or FMOD)Q50 Switching Audio mute ON/OFFQ51,52 Active fi lter AF power AMP power supplyQ53~58 Switching Audio muteQ100 Switching 3.3V switchQ101 Switching Q100 ControlQ652,653 Switching IC684 ControlQ654,655 Switching IC686 ControlD1 Switching Catch diode for 1.2V swtchingregulatorRef. No. Use/Function Operation/Condition/CompatibilityD50~52 Surge absorption Relay circuitD100 Reverse currentprevention BKC signal lineD656 Reverse currentprevention For 5V (to X46-399)DISPLAY UNIT (X54-3850-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC5 3.3V AVR Power supply for 3.3V (digitalcircuit)IC6 MCU Panel microcomputerIC7 Shift register Conversion “Serial” and “parallel”IC9~11 Analog multiplex-erSelector for A/D port of panelMCUIC12 Bus buffer Extension output for PRST signalIC301 AND gate Display backlight controller IC forIC306,IC307 controlIC302 7.83V AVR Power supply for 7.83V (main dis-play)IC303~305 AND gate Display backlight controller IC forIC306,IC307 controlIC306,307 LCD backlightdriver Display backlight dimmer controlQ1 Driver LED control for X42-343 G/10PCB LEDQ2 Driver LED dimmer controlQ4 Switching 13.8V power supply switchQ7,10,12,14 Driver LED control for X54-385 A/6 PCBLEDQ16~24 Driver LED control for X54-385 A/6 PCBLEDQ26,27,29 Driver LED control for X54-385 A/6 PCBLEDQ31~47 Driver LED control for X54-385 A/6 PCBLEDQ48 Driver LED control for X42-343 F/10PCB LEDQ49 Driver LED control for X54-385 C/6 PCBLEDQ50 Driver LED control for X42-343 F/10PCB LEDQ51 Driver LED control for X54-385 C/6 PCBLEDQ52 Driver LED control for X42-343 F/10PCB LEDQ53 Driver LED control for X54-385 C/6 PCBLEDQ54 Driver LED control for X42-343 F/10PCB LEDQ55 Driver LED control for X54-385 C/6 PCBLEDQ301,302 Switching Power supply switch for display