Components Description - Kenwood KDC-4023 Service Manual

QQ
3 7 63 1515 0
SWITCH UNIT (X16-1460-1x/2370-10)
Ref.No. Application/Functions
IC1 LCD driver & key matrix
IC2 Remote Sencer
Q1 Key scan start
ELECTRIC UNIT (X25-9600-xx)
Ref.No. Application/Functions
IC1 System control µ-com
IC4 Power amplifire
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
TE
L 13942296513
Q101 DSI driver
Q102 PANEL 5V SW
Q223,224 MUTE
Q501 AM RF amplifire
Q502 FM RF amplifire
DAUGHTER UNIT (X89-2590-10)
Ref.No. Application/Functions
Q221, 222 Audio mute SW
Q225 Audio mute driver
www
.
KDC-2022/V/202MR/4023

COMPONENTS DESCRIPTION

When Q1 base goes Lo, key scan start.
System µ-com
E-Vol output encoder power amplification for speaker.
-
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 (bace : "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
Base "H" : Mute on
Base "H" : Gain UP
Gate "H" : Gain UP
Audio preout is muted when the bose goes "H".
Mute driver for audio mute SW.
x ao u163
y
i
2 9
8
Operation/Condition/Compatibility
Operation/Condition/Compatibility
Q Q
3 6 7 1 3 1 5
Operation/Condition/Compatibility
co
.
9 4 2 8
0 5 8 2 9 9 4 2 8
m
9 9
9 9
3