Kenwood KDC-4090R Service Manual

Also see for KDC-4090R: Instruction manual Instruction manual

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Kenwood KDC-4090R Service Manual Manual pdf 3 page image

KDC-4090R/Y3COMPONENT DESCRIPTIONlSWITCH UNIT(X13-9872-73)Ref.No. Component Name Application/Function Operation/Condition/CompatibilityIC1 LC75883E LCD driver Ready on key-matrixIC2 RS-171 Remote control light sensorQ1 DTA114EKorKRA102Sor key-matrix permission SW Ready on key-matrix, ON when the base goes "Lo"UN2111Q2,3 2SD2114K key illumination selector SW Key illumination is green when Q2 base goes "Hi"Key illumination is red when Q3 base goes "Hi"lELECTRIC UNIT(X25-8712-71)Ref.No. Component Name Application/Function Operation/Condition/CompatibilityIC1 UPD780058GC232 System μ-COM.IC2 TDA7407D E-VOL. & N.C. MPXIC4 TDA7386 Power ICIC6 TDA7479D RDS decoderIC7 BA4911-V4 Power supply ICIC8 HD74HC27FP Mute gate IC 3 input NOR gate x3IC11 S-80830ANNP RESET IC Detection voltage 3.0VIC12 BR24C01AForBR24C01AF-W E2PROMM24C01-WMN6TorS-24C01BQ10 2SC4081or2SD1819A B.U. detection Detect BU voltageQ20 2SC4081or2SD1819A ACC detection Detect ACC voltageQ40 DTA124EUAorUN5112 PREOUT mute driver Mutes when base is "Lo" (controls Q221-224)Q50 2SA1036K SW 5V ON when the base is "Lo".Q51 UMC2N SW 14V ON when the base is "Hi" (controls Q55)Q53 UMC2N Switch for power supply IC ON when the base is "Hi" (controls SW1 pin of powersupply IC)Q55 2SD2375or2SD2396 AVR for SERBO +B Output issued when SW14V is on (base is "Hi")Q70 2SC4081or2SD1819A SURGE detection Detect SURGE voltageQ101 2SC4081or2SD1819A DSI SW DSI LED turns ON when base is "Hi"Q102 DTA114YUAorUN5114 PANEL 5V SW ON when the base is "Lo"Q201 2SC4081or2SD1819A NOISE BuffQ223,224 DTC143TUAorUN5216 PREOUT MUTE Mute applied to PREOUT (output) when base is "Lo"Q251 DTC114YUAorUN5214 Power IC SVR SW Turns ON when base is "Hi" and capacitor on SVRpin dischargesQ301 DTC124EUAorUN5212 FM Lo/DX SW Turns ON during Lo. SEEK when base goes "Hi"