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The Technics manual was very clear and I was able to solve my technical problems.
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The content of the manual was not found on the Internet and was a hard find. I check the net for 5 hours until I came across this web-site. When I did find the book it Auto loaded into my IPAD PDF shelf for books for review at anytime. Overall I am satisfied with the book and it answered all my questions. This repair book is obsolete because the product I bout it for is pretty old. Thanks for the help with the download and even having the manual. Thanks 73's K5HRD
KDC-4090R/Y
COMPONENT DESCRIPTION
qSWITCH UNIT(X13-9872-73)
Ref.No. Component Name IC1 LC75883E IC2 RS-171 Q1 DTA114EKorKRA102Sor UN2111 Q2,3 2SD2114K Application/Function LCD driver Remote control light sensor key-matrix permission SW key illumination selector SW Operation/Condition/Compatibility Ready on key-matrix Ready on key-matrix, ON when the base goes "Lo" Key illumination is green when Q2 base goes "Hi" Key illumination is red when Q3 base goes "Hi"
qELECTRIC UNIT(X25-8712-71)
Ref.No. IC1 IC2 IC4 IC6 IC7 IC8 IC11 IC12 Q10 Q20 Q40 Q50 Q51 Q53 Q55 Q70 Q101 Q102 Q201 Q223,224 Q251 Q301 Component Name UPD780058GC232 TDA7407D TDA7386 TDA7479D BA4911-V4 HD74HC27FP S-80830ANNP BR24C01AForBR24C01AF-W M24C01-WMN6TorS-24C01B 2SC4081or2SD1819A 2SC4081or2SD1819A DTA124EUAorUN5112 2SA1036K UMC2N UMC2N 2SD2375or2SD2396 2SC4081or2SD1819A 2SC4081or2SD1819A DTA114YUAorUN5114 2SC4081or2SD1819A DTC143TUAorUN5216 DTC114YUAorUN5214 DTC124EUAorUN5212 Application/Function System µ-COM. E-VOL. & N.C. MPX Power IC RDS decoder Power supply IC Mute gate IC RESET IC E2PROM B.U. detection ACC detection PREOUT mute driver SW 5V SW 14V Switch for power supply IC AVR for SERBO +B SURGE detection DSI SW PANEL 5V SW NOISE Buff PREOUT MUTE Power IC SVR SW FM Lo/DX SW Operation/Condition/Compatibility
3 input NOR gate x3 Detection voltage 3.0V
Detect BU voltage Detect ACC voltage Mutes when base is "Lo" (controls Q221-224) ON when the base is "Lo". ON when the base is "Hi" (controls Q55) ON when the base is "Hi" (controls SW1 pin of power supply IC) Output issued when SW14V is on (base is "Hi") Detect SURGE voltage DSI LED turns ON when base is "Hi" ON when the base is "Lo" Mute applied to PREOUT (output) when base is "Lo" Turns ON when base is "Hi" and capacitor on SVR pin discharges Turns ON during Lo. SEEK when base goes "Hi"
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