Components Description - Kenwood KDC-3024A Service Manual

KDC-3024A/G/YA/YG,307A/G/YA/YG
SWITCH UNIT (X16-1472-7x)
Ref.No. Application/Functions
IC1 LCD driver & key matrix
Q1 Key scan start
ELECTRIC UNIT (X25-9612-7x)
Ref.No. Application/Functions
IC1 System control µ-com
IC4 Power amplifire
IC6 RDS decoder
IC7 Power supply (Multi AVR)
IC8 MUTE Logic
IC10 Tuner & E-Vol.
IC11 Power on reset
IC12 E2P-ROM
Q10 B.U. detector
Q20 A.C.C detector
Q40 MUTE driver
Q50 SW 5V
Q51 SERBO AVR control
Q55 SERBO AVR
Q70 Surge detector
Q101 DSI driver
Q102 PANEL 5V SW
Q201 Noise buffer
Q223,224 MUTE
Q252 S_METER RC & MPTH TC SW
Q253 S_METER RC & MPTH TC SW
Q501 AM RF amplifire
Q502 FM RF amplifire
Q503 MPX buffer

COMPONENTS DESCRIPTION

When Q1 base goes Lo, key scan start.
System µ-com
E-Vol output encoder power amplification for speaker.
RDS data decode to tuner receive signals.
-
When a pin 1, 2, or 13 is "H", MUTE turns on
When a pin 3, 4, or 5 is "H", P-AMP mute turns ON.
Changer is RESET when a pin 9, 10, or 11 is "L".
FM/AM tuner & stereo decoder & E-Vol.
When B.U. 5V voltage is less than 3.5V, power reset.
Writing and read-out of adjustment data for a tuner
BU on (base "H") : Collector "H"
ACC ON (base : "H") : Collector "L"
Base "L" : Mute on (collector "L")
Base "L" : SW5V on
Pin 2 "H" : Serbo on (pin 4 "H")
Base "H" : Serbo on
Base "H" : Surge detect
Base "H" : DSI on
Panel attch : PAN5V on
Tuner noise input, Emitter output
Base "H" : Mute on
Base "H" : RC&TC=Long (Base "L" at AF serch)
Emitter "H": Collector "H"
Base "H" : Gain UP
Gate "H" :Gain UP
MPX input buffer with RDS
Operation/Condition/Compatibility
Operation/Condition/Compatibility
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