KDC-7024/Y
KDC-722
KDC-8023
SERVICE MANUAL
© 2003-2 PRINTED IN JAPAN
B53-0036-00 (N) 3379
CD RECEIVER
CD mechanism extension cord : W05-0935-00
CD mechanism operation description is
not in this service manual.
Please, refer to service manual X92-
4030-0x (B51-7867-00).
Mounting hardware assy
(J21-9823-03)
DC cord (ISO)
(E30-4942-05)
: KDC-7024/Y
Remote controller assy
(RC-505)
(A70-2040-05)
: KDC-722
DC cord
(E30-6062-05) : KDC-8023
(E30-6106-05) : KDC-722
Lever
(D10-4674-04) x 2
Plastic cabinet assy
(A02-2731-03)
Remote controller assy
(RC-420)
(A70-2026-05)
: KDC-8023
Screw set
(N99-1723-05)
: KDC-722/8023
Screw set
(N99-1734-05)
Antenna adaptor
(T90-0552-05)
: KDC-7024/Y
Size AA battery
(Not supplied)
Escutcheon
(B07-3078-01)
50
4
W
DIGITAL AUDIO
COMPACT
50
4
W
DIGITAL AUDIO
COMPACT
Panel assy
(A64-2981-01): KDC-722, (A64-2983-01): KDC-8023
Escutcheon
(B07-3078-01)
Panel assy
(A64-2995-02):
KDC-722/8023
Panel assy
(A64-2987-01): KDC-7024/Y
Panel assy
(A64-3003-02):
KDC-7024/Y
Escutcheon
(B07-3078-01)
KDC-722 only
3
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.
B
A
Rotary to the
stop position
281
230
This line attached just above
Fig. B
(This figure from look at B arrow)
C
284
702
SW
D
E
F
702
SW
284
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)
w The slider assembly insert to the chassis (702) after
that shift (D) direction.
e The bracket for display panel (284) is raised (E) direc-
tion.
r Keep the raising conditions, the slider assembly is shift
(F) direction.
(Note) Do not bend the knob of chassis detection switch
when the slider assembly insert.
KDC-7024/Y,722,8023
KDC-7024/Y,722,8023
3
BLOCK DIAGRAM
RESET SW
KEY MATRIX
KEY ILL
ROTARY
ENCODER
LCD DRIVER
IC2
SW5V
Q6
PANEL
IC3
REMOCON
WITH
LCD DRIVER
IC1
KEY MATRIX
LCD
BUFFER
RDS
DECODER
BUFFER
u-COM
MPX
E-VOL
&
ACC DET
TEL MUTE
B.U DET
DRIVER
MUTE
POWER
IC
ACC
TEL MUTE
BACK UP
SP OUT (FL)
RESET
IC12
IC2
IC1
IC4
IC7
Q102,103
AM+B
PRE MUTE
PRE MUTE
PRE OUT
(FRONT)
(REAR/NF)
PRE OUT
AUX IN
SP OUT (FR)
SP OUT (RL)
SP OUT (RR)
EXT AMP
DIMMER
DIMMER
EXT.AMP.CON
ANT-CON
ANT CON
P-CON
P CON
WIRED REMO/
OPEL DISP I/F
IC8
Q59,60
BU5V
SW 5V
SW 14V
SERVO
ILL+B
SW REG
A8V
Q1,2
Q3
Q4,5
Q6-8
Q9,34
BU5V
SW5V
SW14V
A8V
SERVO
CD5.0V
IC14
MOTOR
DR
DR
MOTOR
IC13
EEPROM
EEP5V
Q501
IC1
Q23,24
Q30
Q29
Q25,26
Q32
Q33
Q11-14
IC5
Q104
Q53
KEY
BU5V
BU5V
BU5V
BU5V
S-METER
AUDIO OUT
SERVO
8V
BU5V
CD4.7V
BACK UP
FM
AM
CD
QUAL
CH
BU5V
8V
SW5V
8V
8V
SW5V
8V
SW5V
BU5V
BU5V
BU5V
SERVO
(X16-214)
(X16-219)
SWITCH UNIT
DISPLAY UNIT
TUNER
CD
CH
MECHA
PANEL
TDF UNIT (X16-208)
(X25-966)
KDC-7024/Y,722,8023
4
q SUB-CIRCUIT UNIT (X16-2080-10)
Ref. No.
Application/Function
Operation/Condition/Compatibility
IC1
E2PROM
For security
q SUB-CIRCUIT UNIT (X16-2140-10)
Ref. No.
Application/Function
Operation/Condition/Compatibility
IC1
LCD driver
KEY Input
IC2
LCD driver
IC3
Remote control sensor
Q1
KEY scan start SW
ON when the base goes "L".
Q5, D26
VLCD AVR
Q6
Remote control sensor power supply SW
ON when the base goes "L".
Q11
Dimmer control
LCD back light control. OFF when the base goes "L", ON when the base goes "H".
q SWITCH UNIT (X16-2190-10)
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"
q ELECTRIC UNIT (X25-966x-xx)
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
IC7
Reset IC
IC8
Logic IC for muting
IC12
RDS decoder IC
IC13, 14
Motor driver IC for panel mechanism
IC15
ROM IC
For ROM correction.
Q1, 2
B.U.5V AVR
While BU is applied, BU5V AVR outputs +5V.
Q3
SW5V
When Q3'base goes Lo, 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 8.4V.
Q9, 34
SERVO+B AVR
When Q34'base goes Hi, S+B AVR outputs 7.4V.
Q11~14
ILL+B AVR
When Q11'base goes Hi, AVR outputs 10.5V.
Q23, 24
P-ANT SW
When Q23'base goes Hi, P-ANT SW outputs 14V.
Q25, 26
P-CON SW
When Q26'base goes Hi, P-CON SW outputs 14V.
Q27, 28
P-CON protection
Protect Q27 by turning on when P-CON output is grounded.
Q29
Ex Amp control buffer
Q30
Small lamp det SW
When Q30'base goes Hi, Q30 is turned on.
Q32
BU det
When Q32'base gose Hi, Q32 is turned on.
Q33
ACC det
When Q33'base gose Hi, Q33 is turned on.
Q51, 52
Mute driver
When a base gose Lo, mute driver is turned on.
Q53
Noise buffer
Q54
E-vol mute SW
When a base gose Hi, mute SW is turned on.
COMPONENTS DESCRIPTION
KDC-7024/Y,722,8023
5
Ref. No.
Application/Function
Operation/Condition/Compatibility
Q55, 56
Pre-out mute SW
When a base gose Hi, Pre-out is muted.
Q59, 60
Pre-out mute SW
When a base gose Hi, Pre-out is muted.
Q63
E2P 5V SW
When Q63'base gose Lo, E2P 5V is out.
Q102, 103
AM+B SW
When Q102'base gose Hi, AM+B is out.
Q104
Composite signal buffer for RDS
COMPONENTS DESCRIPTION
q SYSTEM MICROCOMPUTER : UPD703030GC015 (X25-966 : IC1)
Pin No.
Pin Name
I/O
Module
Purpose / Description
Truth table
Processing Operation
1
PLL_DATA
I/O
Tuner
Data output/input with F/E.
2
AM+B
I/O
Power supply
AM+B.
AM operation : H
3
(FM+B)
O
Power supply
FM+B (S01 F/E only).
FM operation : H,
Last FM : H (With RDS, RBDS model)
4
V_ILL PAN_E2P DATA I/O
To panel
V-ILL D/A converter (V-ILL, LCD), E2PROM data.
5
V_ILL PAN_E2P CLK
I/O
To panel
V-ILL D/A converter (V-ILL, LCD), E2PROM clock.
6
EVDD
-
7
EVSS
-
8
AFS
O
Tuner
Noise detection time constant switching.
FM seek, AF search : L, Receiving : H, Auto 0 : L
9
BEEP
O
Audio
Beep output.
10
REMO
I
Extra
Remote control input (Panel, External display).
11
P_MUTE
O
Audio
Power IC MUTE output.
Power OFF : L, All OFF : L, TEL mute : L
12
(SVR)
O
Audio
Power IC SVR discharge circuit control.
Power OFF momentary power dropped
: H (5 second) and then L
CD
CD mechanism data line.
13
IC2_SDA
I/O
Audio
IC2 data line.
Extra
ROM correction data line.
CD
CD mechanism clock line.
14
IC2_CLK
I/O
Audio
IC2 clock line.
Extra
ROM correction clock line.
15
P_STBY
O
Audio
Power IC STBY output.
Power IC ON : H, Power IC OFF : L, All OFF : H
16
P_CON
I/O
Extra
Power control.
Power ON : H, Power OFF : Hi-Z, All OFF : Hi-Z
17
DIMMER_CONT
O
To panel
Dimmer control (W-LED only).
Dimmer : Pulse control,
Frequency : 1kHz, Normally : H
18
TEST
-
Connect to GND.
19
TYPE2
I
Extra
Destination select.
w
NC
O
Extra
NC (MP3 mechanism model).
w
Output : L
20
MUTE
O
Audio
Mute output.
ON : OPEN, OFF : L
21
PRE_MUTEL
O
Audio
PREOUT (L ch) mute.
M MUTE L is L : L (CD), Momentary power
dropped : L, 2 zone, NAVI interrupt : Fixed H
22
PRE_MUTER
O
Audio
PREOUT (R ch) mute.
M MUTE R is L : L (CD), Momentary power
dropped : L, 2 zone, NAVI interrupt : Fixed H
MICROCOMPUTER'S TERMINAL DESCRIPTION