Kenwood KDC-5021, Service Manual

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KDC-5021/5021V,506
3
COMPONENT DESCRIPTION
REF.
FUNCTION OPERATION
No.
IC1 SYSTEM u-COM System u-com.
IC2 E-VOL/NC/MPX E-volume, Noise Chancellor, Multiplexer.
IC3 MUTE 4 inputs, 3 NOR gates.
IC4 POWER IC Power IC.
IC5 SWITCHING OP AMP Switches operation amplifier.
IC7 RDS DEMODULATOR Demodulates RDS.
IC8 RESET IC "L" when detection voltage goes below 3.0V.
IC9 EEPROM EEPROM.
Q1 FM+B SW Q1 turns on when Q2 base level goes "H".
Q2 FM+B SW Turns on when FM signal exists.
Q3 AM+B SW Q3 turns on when Q4 base level goes "H".
Q4 AM+B SW Turns on when AM signal exists.
Q6 IFC BUFFER Shapes wave form.
Q201 PRE MUTE SW (FRONT Lch) Mutes when the base level goes "H".
Q202 PRE MUTE SW (FRONT Rch) Mutes when the base level goes "H".
Q203 PRE MUTE SW (REAR Lch) Mutes when the base level goes "H".
Q204 PRE MUTE SW (REAR Rch) Mutes when the base level goes "H".
Q205 PRE MUTE SW (NON-FADER Lch) Pre mute SW.
Q206 PRE MUTE SW (REAR Rch) Pre mute SW.
Q401 E-VOL MUTE SW Mutes E-vol when the base level goes "H".
Q402 NOISE BUFFER Buffers noise.
Q403,404 AUDIO MUTE DRIVER Turns on when the base level goes "L".
Q501
BU & MOMENTARY POWER
Turns on when the base level goes "H" during the back-up effects.
DOWN DETECTOR
Q502 ACC DETECTOR Turns on when the base level goes "H" during ACC effects.
Q503,504 P-ANT SW Q503 turns on when Q504 base level goes "H".
Q505 P-CON SW Q505 turns on when Q508 base level goes "H".
Q506 P-CON PROTECTOR Protects Q505 by Q506 turning on when P-CON output effect stops.
Q507 P-CON PROTECTOR Prevents Q507 turning on during being stand-by after turning power on.
Q508 P-CON SW Q505 turns on when Q508 base level goes "H".
Q510 SMALL LAMP DETECTOR Turns on when the base level goes "H" during illumination lights.
Q701,702 BU 5V AVR Turns on when the back-up effects.
Q703 SW 5V Turns on when the base level goes "L".
Q704,705
AUDIO 8V & SERVO +B AVR
Q704 turns on when Q705 base level goes "H".
ON/OFF SW
Q706,707 AUDIO 8V AVR Output voltage is 8.3V.
Q708 SERVO +B AVR Output voltage is 7.4V.
Q901-903 ILLUMINATION AVR AVR output turns on when Q901 base level goes "H".
Q905 PANEL 5V SW Turns on when the base level goes "L".
Q906 GUIDE ILLUMI SW Turns on when the base level goes "L".
Q907 EJECT KEY & DSI ILLUMI SW Turns on when the base level goes "L".
ELECTRIC UNIT (X25-922x-xx)
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