Kenwood KDC-8024 Service Manual

CD RECEIVER

KDC-8024

SERVICE MANUAL

CD mechanism operation description is not in this service manual. Please, refer to service manual X92-4030-0x (B51-7867-00).

Panel assy (A64-2985-01)

CD mechanism extension cord : W05-0935-00

50 4W

COMPACT

DIGITAL AUDIO

Escutcheon (B07-3078-01)

Panel assy (A64-3002-02)

Escutcheon (B07-3078-01)

Remote controller assy (RC-420) (A70-2026-05)

Mounting hardware assy (J21-9823-03)

Lever (D10-4674-04) x 2

Plastic cabinet assy (A02-2731-03)

Screw set (N99-1734-05)

DC cord (ISO) (E30-4942-05)

Antenna adaptor (T90-0552-05)

KDC-8024

HOW TO THE PANEL MECHANISM ASSEMBLY

1. Fixed the position of operation side (Fixed the horizontal position when the panel opened)

q The mounting hardware (281) of operation side is rota-

tion (A) into the stop position with close side.

w As figure (B) line is just above and the gear (230) at-

tached to pin.

2. The slider assembly insert to bottom chassis

q The bracket for display panel (284) is leave down, in-

sert to the chassis (702). (C)

Rotary to the stop position

This line attached just above

Fig. B

(This figure from look at B arrow)

284

281

230

w The slider assembly insert to the chassis (702) after

that shift (D) direction.

e The bracket for displa y panel (284) is raised (E) direc-

tion.

r Keep the raising conditions, the slider assemb ly is shift

(F) direction. (Note) Do not bend the knob of chassis detection switch when the slider assembly insert.

702

284

702

BLOCK DIAGRAM

KDC-8024

(X25-964)

TUNER

AUDIO OUT

S-METER

Q501

EEP5V

IC1

EEPROM

TDF UNIT (X16-208)

Q303,304

AM+B

8V 8V

BU5V 8V SERVO CD4.7V

BACK UP

BU5V

DISPLAY UNIT (X16-212)

REMO

IC9

SWITCH UNIT

(X16-217)

BUFFER

IC14

RDS DECODER

IC11

ROT ARY ENCODER

SW5V

u-COM

BPF

BU5V

KEY MATRIX

IC1

KEY

AGC

IC10

BPF

LEVEL SHIFT

BUFFER

AGC

SW5V

PANEL5

Q6,10

PANEL SW5V

FL3.3V

Q2,3

FL+B

RESET SW

IC2

FM AM CD CH

QUAL

u-COM

E-VOL

MPX

KEY ILL

IC15

MOTOR

FL+B FAC

IC5

SYSTEM E'S+

WOW

IC20

FOCUS SW

IC8

RESET

IC16

SERVO

PANEL MECHA

SW5V

DC/DC

IC6

BU5V

MOTOR DRDR

IC9

MUTE DRIVER

Q207,208

PRE MUTE

Q203,204

PRE MUTE

Q205,206

PRE MUTE

IC4

POWER IC

BU5V

IC18

Q23,24

ANT-CON ANT CON

Q25

EXT AMP

Q26

DIMMER DIMMER

TEL MUTE

Q29

ACC DET

Q27

B.U DET

BU5V

SW5V

PANEL5V

SW14V

DC/DC A8V

SERVO

CD4.7V

IC13

IC12

IC11

P-CON P CON

Q1,2

BU5V

Q3,601

SW 5V

Q502,503

PANEL 5V

Q4,5

SW 14V

Q6-8

A8V

Q9,602

SERVO

Q11-14

FL+B

IC19

SW REG

OP AMP

PRE OUT (NF)

PRE OUT (REAR)

PRE OUT (FRONT)

SP OUT (FL) SP OUT (FR) SP OUT (RL) SP OUT (RR)

WIRED REMO/ OPEL DISP I/F

EXT.AMP.CON

TEL MUTE

ACC

BACK UP

KDC-8024

COMPONENTS DESCRIPTION

● SUB-CIRCUIT UNIT (X16-2080-10)

Ref. No. Application/Function Operation/Condition/Compatibility

IC1 E2PROM For security

● SUB-CIRCUIT UNIT (X16-2120-10)

Ref. No. Application/Function Operation/Condition/Compatibility

IC1 3.3V regulator The power supply of IC and VFD (Logic) which are driven by 3.3V IC2 Buffer IC It is change into 3.3V from 5V IC3 Remote control IC IC4 Spectrum analyzer IC IC5 Panel µ-com Q1, 2 FL+B SW FL+B (VDD2) is turned on when Q2’s base level goes “H” Q3 REMO ON SW The power supply of IC2 and IC3 is turned on when Q3’s base level goes “L” Q4 FL BLK SW VFD is turned on when Q4’s base level goes “H” Q5 Blue LED SW Blue LED is turned on when Q5’s base level goes “H”

● SWITCH UNIT (X16-2170-10)

Ref. No. Application/Function Operation/Condition/Compatibility

Q1 DSI (Disabled System Indicator) DSI blinks when the base goes “H/L” Q2 KEY illumination SW (GREEN) ON (KEY illumination green) when the base goes “H” Q3 KEY illumination SW (RED) ON (KEY illumination red) when the base goes “H”

● ELECTRIC UNIT (X25-9642-72)

Ref. No. Application/Function Operation/Condition/Compatibility

IC1 System µ-com IC2 E-vol & N.C. & MPX IC3 Regulator IC for A8V IC4 Power IC IC5 System E’s IC IC6 Audio IC (WOW) IC8 Reset IC IC9 Logic IC for muting IC10 Buffer for S.A IC14 RDS dcoder IC IC15, 16 IC17 ROM IC For ROM correction. IC18 P-CON IC IC20 Analog SW for swiching IC6’focus Q1, 2 B.U.5V AVR While BU is applied, BU5V AVR outputs +5V. Q3, 601 SW5V When Q601’base goes Hi, SW5V outputs +5V. Q4, 5 SW14V When Q5’base goes Hi, SW14V outputs 14V. Q6~8 AUDIO 8V AVR When Q6’base goes Hi, A8V AVR outputs 8.3V. Q9, 602 SERVO+B AVR When Q602’base goes Hi, S+B AVR outputs 7.5V. Q11~14 ILL&DC/DC+B AVR When Q11’base goes Hi, AVR outputs 9.2V. Q25 Ex amp control buffer

Motor driver IC for panel mechanism

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