KENWOOD KDCZ638
Manual de Servicio

COMPONENTS DESCRIPTION
SWITCH UNIT (X16-168x-xx)
Ref.No. IC1 IC2 IC3 IC4 IC5 Q1 Q2 Q3 Q4 Q6 Q7 Q8 Q9 Q10 Component Name TAR5S33 TC74HC4050AFT RS-171 BA3830F UPD703032GFA04 DTA144EUA or UN5113 DTC114YUA or UN5214 DTA114EUA or UN5111 DTC114EUA or UN5211 DTC114YK or UN2214 2SC4081 2SC4081 DTA114EUA or UN5111 DTA114EUA or UN5111 Application/Function FL AVR Buffer Remote sensor IC BPF IC Panel MI-COM. FL+B SW REMO SW FL blanking SW SRC key illumination SW V-I conver ter V-I conver ter Key illumination Red SW Key illumination Green SW BPF for the spectrum analyser indicator +3.3V Output

KDC-719/X559 /Z737,Z638

Operation/Condition/Compatibility For FL control lines, 5V�3.3V logic level shifting

FL & Illumination +B ON/OFF control. When Q2's base goes Hi, Q1 is turned on, and FL+B (45V) line is supplied to FL indicator and the key illumination circuit. When a base goes Lo, Q3 is turned on, and PAN5V line is supplied to IC3 and IC4. When a base goes Hi, Q4 is turned on, and FL indicator is lit. When a base goes Hi, Q6 is turned on, and SRC illumination is lit. Current driver for green LEDs Current driver for red LEDs When a base goes Lo, Q9 is turned on, and key illumination Red is lit. When a base goes Lo, Q10 is turned on, and key illumination Green is lit.

ELECTRIC UNIT (X25-924x-xx)
Ref.No. IC1 IC2 IC3 IC4 IC5 IC6 IC7 IC8 IC10 IC11 IC12 IC14 IC16 IC20 IC21 IC25 Q1 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Component Name UPD703033GFA18 TDA7407 M5237ML TDA7560 TDA7401 ICL7660SIBA TC74HC02AF NJM4565M-TE2 NJM4565M-TE2 NJM4565M-TE2 NJM4565M-TE2 TDA7479D S-80837ANNP BA3121F BA3129F BR24C02F-W 2SD2375 2SA1037K 2SA2057 DTC144EUA or UN5213 DTA124EUA or UN5112 DTA124EUA or UN5112 DTC124EUA or UN5212 2SB1427 2SA2057 2SC4081 Application/Function System MI-COM. E-VOL.& N.C. MPX AVR IC Power IC High pass filter & Non-Fader volume DC/DC converter Mute logic Op. amp. Op. amp. Op. amp. Op. amp. RDS decoder Reset IC Isolation amplifier Switched op.amp. EEPROM CD servo AVR SW 5V A.+8V AVR A.+8V AVR SW SW14V PAN5V SW FL/Illumination AVR AVR for CD mechanism servo operation, +7.5V output. While a base goes Lo, SW 5V is supplied to the microprocessor peripheral circuits. Q4 is combined with IC3, and it works as the power supply of +8.0V output. When Q5's base goes Hi, Q6 is turned on, and A.+8V AVR is working. When Q8's base goes Hi, Q7 is turned on, and A.+8V AVR, CD servo AVR and A+10V AVR are working. For PAN5V on/off switching. When a base goes Lo with panel attached to the set, Q9 is turned on, and PAN5V is supplied to the panel. When Q11's base goes Hi, AVR outputs +9V. When BU 5V voltage is less than 3.7V, IC outputs Lo. AUX inputs isolation amplifier Input switching with AUX inputs and CD inputs HPF (Front/Rear output), LPF, Non-Fader switching and volume function -9V AVR for pre-output amplifier 2-input NOR x 4 Amplifier for the spectrum analyser and generation of Vref. (1/2Vcc) voltage Amplifier for the front pre-outputs Amplifier for the non-fader pre-outputs Amplifier for the rear pre-outputs IC is combined with Q4, and it works as the error detection, the Q4's driver. Operation/Condition/Compatibility

3