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Service Manual

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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of KENWOOD KDC422 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 3 (click to view)
q CD PLAYER UNIT (X32-5400-00)

Component Name

RF amplifier adapted for CD-RW

Generation of RF signal based on the signals from the APC circuit and pickup, and generation of servo error (focusing error and tracking error) signals. Detection of dropout, anti-shock, track crossing and off-track conditions, included gain control function during CD-RW.



CD signal processor built-in MI-COM Focusing, tracking, sled and spindle servo processing. Automatic adjustment (focusing, tracking, gain, offset and balance) operations. Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data Interpol ration) operations, and Microcomputer function.

IC3 IC4 Q1 Q2 Q3 Q4 Q5 Q6 D1 D2 D3

BA5824FP NJM4580M1 MCH6101 2SA1362(Y) DTC124EUA DTA143XUA 2SC4081 2SA1576A DAN202U MA8051-L DA204U

4CH BTL driver Low pass filter APC D.5V SW Q4 SW A.8V SW Current driver Current driver Protection diode Zener diode Current driver

Focusing coil, tracking coil, spindle motor and sled motor driver, disc loading and eject operation. 2nd low pass filter for audio signals. LD power control. When P ON signal gose"L", Q2 is ON. When P ON signal gose"L" (SW+5V AVR is ON), Q3 is ON. When P ON signal gose"L" (Q3 is ON), Q4 is ON. Current driver. Current driver. Laser diode protection. DAC AVR/LPF reference voltage (A.5V). Current driver.

q ELECTRIC UNIT (X25-9800-11/12/21)

Component Name
UPD703030GC013 TDA7411 BA4911-V4

System microcomputer Electronic volume & N.C.MPX Power supply IC

Control for TUNER unit, CD mechanism, volume & tone, LCD driver and external CD changer unit Control for source selector, volume & tone, and FM multiplex detector. Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con).
SW1 1.5-3.0V 3.5-5.0V 7.0VSW2 2.0-3.0V 4.0VOUT Audio ON Audio, P-con ON Audio, P-con, P-ant ON Illumination, FM ON Illumination, AM ON

IC4 IC6 IC8 Q1 Q2 Q3 Q4 Q21 Q22 Q23 Q31

TA8273H HD74HC27FP PST3436UL 2SC4081 2SC4081 2SC4081 2SA1036K 2SD2375 UMC2N UMC2N UN5213

Audio power amp IC Muting control IC Reset IC Serge detection Backup detection ACC detection SW 5V AVR SW IC control Dimmer control

Amplifier for audio signal to derive for 4channel speakers (50W maximum for each channel). Control for timing for mute. When detection voltage goes below 3.5V or less Reset IC output change to "L" signal. When backup voltage become more than 24V output is "L" (momentary power down) / When backup voltage become less than 24V output is "H". When BU voltage supplied output is "L" / When BU voltage not supplied or momentary power down is detected output is "H". When ACC voltage supplied output is "L". When base voltage is "L" Q4 is ON. Servo regulator. Servo SW. Power supply IC controller. When base voltage is "H" dimmer is ON.


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