KENWOOD KDC8020 Service Manual

Cover page of KENWOOD KDC8020 Service Manual

Service Manual for KENWOOD KDC8020, downloadable as a PDF file.

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© 2001-11 PRINTED IN JAPAN
B51-7868-00 (S) 3420
SERVICE MANUAL
CD RECEIVER
KDC-5019/519/8020
KDC-7021/7021Y/B7021
This service manual does not include information on the CD mechanism assembly (exploded view, parts list,
schematic diagram or mechanism operation description).
For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X
: B51-7867-00).
Front glass
(B10-4157-01)
Panel assy
(A64-2578-02)
Front glass
(B10-4158-01)
Panel assy
(A64-2579-02)
KDC-5019
KDC-519
Front glass
(B10-4162-01)
Panel assy
(A64-2583-02)
Front glass
(B10-4160-01)
Panel assy
(A64-2581-02)
KDC-8020
KDC-7021/Y
Front glass
(B10-4163-01)
Panel assy
(A64-2584-02)
KDC-B7021
DC cord
(E30-4942-05)
: KDC-7021Y
(E30-4956-05)
: KDC-7021/B7021
Antenna adaptor
(T90-0523/0534-05)
KDC-7021/7021Y/B7021 only
Screw set
(N99-1704-05)
Screw set
(N99-1722-05)
Bracket (L)
(J19-5051-03)
KDC-5019/519/8020 only
Bracket (R)
(J19-5052-03)
Lever
(D10-4562-04)x2
(D10-4621-04)x2: KDC-7021/B7021
Mounting
hardware assy
(J21-9716-03)
Torsion
coil spring
(G01-2924-04)
Plastic
cabinet assy
(A02-1497-13)
Remote
controller assy
(A70-2025-05)
Remote controller assy
(A70-0886-15)
Escutcheon
(B07-3010-02)
DC cord
(E30-4940-05)
: KDC-5019/519
DC cord
(E30-4939-05)
: KDC-8020
q
background image
© 2001-11 PRINTED IN JAPAN
B51-7868-00 (S) 3420
SERVICE MANUAL
CD RECEIVER
KDC-5019/519/8020
KDC-7021/7021Y/B7021
This service manual does not include information on the CD mechanism assembly (exploded view, parts list,
schematic diagram or mechanism operation description).
For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X
: B51-7867-00).
Front glass
(B10-4157-01)
Panel assy
(A64-2578-02)
Front glass
(B10-4158-01)
Panel assy
(A64-2579-02)
KDC-5019
KDC-519
Front glass
(B10-4162-01)
Panel assy
(A64-2583-02)
Front glass
(B10-4160-01)
Panel assy
(A64-2581-02)
KDC-8020
KDC-7021/Y
Front glass
(B10-4163-01)
Panel assy
(A64-2584-02)
KDC-B7021
DC cord
(E30-4942-05)
: KDC-7021Y
(E30-4956-05)
: KDC-7021/B7021
Antenna adaptor
(T90-0523/0534-05)
KDC-7021/7021Y/B7021 only
Screw set
(N99-1704-05)
Screw set
(N99-1722-05)
Bracket (L)
(J19-5051-03)
KDC-5019/519/8020 only
Bracket (R)
(J19-5052-03)
Lever
(D10-4562-04)x2
(D10-4621-04)x2: KDC-7021/B7021
Mounting
hardware assy
(J21-9716-03)
Torsion
coil spring
(G01-2924-04)
Plastic
cabinet assy
(A02-1497-13)
Remote
controller assy
(A70-2025-05)
Remote controller assy
(A70-0886-15)
Escutcheon
(B07-3010-02)
DC cord
(E30-4940-05)
: KDC-5019/519
DC cord
(E30-4939-05)
: KDC-8020
q
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KDC-5019/519/7021/7021Y/8020/B7021
2
BLOCK
DIAGRAM
PLL+B
FM+B
Q43,44
Q45,46
AM+B
DIMMER
MUTE
2WAY
DET.
ACC
BU DET.
A8V
A8V
Q4-6
IC3
Q9
Q7,8
Q10-13
SERVO AVR
SERVO+B
SW5V
Q3
Q50,51
Q30
Q1,2
SW5V
BU5V
BU5V
P CON
ANT-CON
Q26-29
MUTE
IC8
Q32,33,35
DRIVER
MUTE
Q37-40
POWER IC
IC4
SYSTEM MI-COM
CD
CH
F/E
A1,Q53
E-VOL
IC2
PRE OUT
SP-OUT
DIMMER
TEL-MUTE
ACC
ANT-CONT
Q24,25
P-CONT
BACK UP
A-CONT
P-CONT
DECODER
RDS
IC1
IC14
Q52
EX.AMP CONTROL
ILLUM
+B
RESET
SW
RESET IC
IC16
IC2
IC1
Q7
Q3,4
Q5
LCD
DRIVER
REMO
G/R SW
DIMMER
SW
BUFFER
NOISE
Q36
OUTPUT VOLTAGE
CONTROL
EX.AMP
Q14
Q15
Q31
(E,Z) TYPE
(E,Z) TYPE
(E,Z) TYPE
(K,M) TYPE
NAVI-MUTE
PANEL 5V
PANEL 5V
KEY
MATRIX
SW14V
SRM
MECHA.
SRM
DRIVER
MOTOR
(BACK LIGHT)
LCD
ED1
CH
QU
A
L
SERVO+B
MUTE R
STOP
SW2
LO/EJ
MUTE L
RST
SW3
SW1
SDA
SCL
A8V
BU5V
SW5V
RST
REQ C
CLK
CH-CON
DATA H
REQ H
CD
AM
FM
P MUTE
MUTE
SW5V
PANEL5V
L
D
ATA
L
L
CE
L
CLK
L
D
ATA
S
DIMMER
REMO
RESET
ILL+B
SRM
SW1
SRM
DET
SRM
SW2
SRM
SW3
SRM
SUB-
SRM
SUB+
RDCK
RDD
A
QU
A
L
SD
A
SCL
AFS
AFS
A8V
PLL DATA
PLL CLK
IFC OUT
S-METER
SW5V
SW5V
DATA C
BACK UP
BU5V
PANEL 5V
CHANGER
AM
FM
230mV
1200mV
1200mV
251mV (E,Z) TYPE
470mV (K,M) TYPE
AUDIO OUT
NOISE
CD
3600mV
3600mV
855mV
1372mV
3600mV
3600mV
600mV
1800mV
DRIVER
MUTE
MO SW
LCD
AVR
(X16- )
IC15
(E,Z) TYPE
(K,M) TYPE
(E,Z) TYPE
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KDC-5019/519/7021/7021Y/8020/B7021
3
COMPONENT DESCRIPTION
q SWITCH UNIT(X16-154X-XX, X16-1892-7X)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
LC75808W
LCD driver with key matrix
IC2
RS-171
Remote sensor IC
Q1
DTA114EUA or KRA302 Key permission SW
For the key scanning start and the key detection SW
Q3
2SC4081
Red LED SW
When a base goes Hi, RED LEDs are turned on.
Q4
2SC4081
Green LED SW
When a base goes Hi, GREEN LEDs are turned on.
Q5
2SC4081
VLCD AVR
For LCD driver IC
Q6
DTA114EUA or KRA302 REMO SW
While a base goes Lo, PAN 5V is supplied to the Remote sensor IC.
Q7
DTC143ZK
Dimmer SW
Usually Q7's base goes Hi. When DIMMER mode is selected, pulse
wave shape is applied to Q7's base.
q ELECTRIC UNIT(X25-939X-XX, X25-8762-7X)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
UPD703033GC139
System MI-COM.
IC2
TDA7407D
E.VOL & N.C.MPX IC
IC3
M5237ML
AVR IC
IC is combined with Q4, and it works as the error detection, the driver.
IC4
TA8273H
Power IC
HD74HC02FP
IC8
or TC74HC02AF
Mute logic
2-input NOR x 4
or 74VHC02SJ
IC14
TDA7479D
RDS decoder
IC15
LB1930M
Motor driver IC
IC16
S-80837ANNP
Reset IC
When BU 5V voltage is less than 3.7V, IC outputs Lo.
Q1
2SB1548(P)
BU 5V AVR
While BACKUP is applied, AVR outputs +5V.
Q2
2SC4081 or 2SD1819A
Q1 and Q2 are inverted Darlington connection.
Q3
2SA1576A or 2SB1218A SW 5V
While a base goes Lo, SW 5V is supplied to the microprocessor
peripheral circuits.
Q4
2SB1548(P)
A8V AVR
Q4 is combined with IC3, and it outputs +8.3V.
Q5
DTC144EUA or UN5213
A8V AVR SW
A8V AVR ON/OFF control
Q6
DTA124EUA or KRA303
While Q5's base goes Hi, Q6 is turned on, and A8V AVR is working.
Q7
DTA124EUA or KRA303
A8V AVR and SERVO +B AVR ON/OFF control
Q8
DTC144EUA or UN5213
SW14V SW
While Q8's base goes Hi, Q7 is turned on, A8V AVR and SERVO +B
AVR are working.
Q9
2SD2375
SERVO +B AVR
When Q9's base goes Hi, SERVO +B AVR outputs +7.6V.
Q10
2SB1184
ILL +B AVR
While Q11's base goes Hi, AVR outputs +10.7V.
Q11
2SC4081 or 2SD1819A
Works during POWER ON mode with a panel attached to the set.
Q12
DTC144EUA or UN5213
ILL +B SW
ILL +B AVR ON/OFF control
Q13
DTA124EUA or KRA303
While Q12's base goes Hi, Q13 is turned on, and ILL +B AVR is working.
Q14
DTA123JK or KRA105S EXT. AMP CON. SW
When a base goes Lo, Q14 is turned on, and control pulse waveform
shape is outputted.
Q15
DTC144EUA or UN5213 Small lamp detection SW
When vehicle small lamps turn on, Q15 is turned on .
Q24
DTC114YUA or UN5214
ANT-CON. SW
When Q24's base goes Hi, Q25 is turned on.
Q25
2SB1277(Q,R)
Works during the tuner reception mode.
Q26
2SB1277(Q,R)
P-CON SW
When Q29's base goes Hi, Q26 is turned on .
Q29
DTC114YUA or UN5214
Works during POWER ON mode.
Q27
2SA1576A or 2SB1218A
P-CON. protection SW
Protect Q26 by turning ON when P-CON output is grounded.
Q28
DTA124EUA or KRA303 P-CON. protection inhibit SW
Prevents Q27 tuning ON during start-up after power ON.
While BACKUP is applied, a base goes Hi, and Q30 is turned on.
Q30
2SC4081 or 2SD1819A BU detection SW
When momentary power down has detected, a base goes Lo, and
Q30 is turned off.
Q31
2SC4081 or 2SD1819A
ACC detection SW
While ACC is applied, a base goes Hi, and Q31 is turned on.
Q32
DTA124EUA or KRA303 Mute driver for L Ch.
When BU detection SW or System RESET or MI-COM.'s Pre-mute is
Q33
DTA124EUA or KRA303 Mute driver for R Ch.
working, a base goes Lo, and Q32 and Q33 are turned on.
Q35
DTC124EUA or UN5212 E. VOL mute SW
When BU detection SW or MI-COM.'s mute is working, a base goes
Hi, and Q35 is turned on.
Q36
2SC4081 or 2SD1819A Noise buffer
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KDC-5019/519/7021/7021Y/8020/B7021
4
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
Q37
DTC143TUA or KRC410 Audio mute SW (Front L)
When Q37's base goes Hi, Pre-output is muted.
Q38
DTC143TUA or KRC410 Audio mute SW (Front R) When Q38's base goes Hi, Pre-output is muted.
Q39
DTC143TUA or KRC410 Audio mute SW (Rear L)
When Q39's base goes Hi, Pre-output is muted.
Q40
DTC143TUA or KRC410 Audio mute SW (Rear R)
When Q40's base goes Hi, Pre-output is muted.
Q43
DTC124EUA or UN5212
FM +B SW
When Q43's base goes Hi, Q44 is turned on, and A8V is supplied to the F/E.
Q44
2SB1277(Q,R)
Works during FM reception mode.
Q45
DTC124EUA or UN5212
AM +B SW
When Q45's base goes Hi, Q46 is turned on, and A8V is supplied to the F/E.
Q46
2SB1277(Q,R)
Works during AM reception mode.
Q50
DTC144EUA or UN5213
PAN 5V SW
While a panel is attached to the set, Q50 and Q51 are turned on, and
Q51
2SA1576A or 2SB1218A
BU 5V is supplied to the panel.
Q52
2SC4081 or 2SD1819A
Composite signal output buffer
Q53
DTC144EUA or UN5213
IFC buffer
Waveform shaping
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KDC-5019/519/7021/7021Y/8020/B7021
5
MICROCOMPUTER'S TERMINAL DESCRIPTION
q IC1(ELECTRIC UNIT : X25-939X-XX, X25-8762-7X)
Pin No.
Pin Name
I/O
Description
Processing Operation
1
AM+B
O
AM+B control
Hi: During AM reception
2
FM+B
O
FM+B control
Hi: During FM reception, Hi: During FM reception
if with RDS, RDBS
3
AFS
O
Noise detection time constant switching terminal
Hi: During FM reception, Lo: During FM seek or
AF search
4
PLL-DATA
I/O Data input/output with F/E
5
PLL-CLK
I/O Clock output to F/E
6
EVDD
-
Positive power supply connection terminal
Connected to BU 5V lines.
7
EVSS
-
Ground connection terminal
Connected to GND lines.
8
N.C.
O
Not used(N.C.)
9
BEEP
O
BEEP sound output
10
REMO
I
Data input from the remote control light sensor
11
PRE-MUTE L
O
Pre-out mute control (L)
When M MUTE L input is Lo during CD source
selected, PRE MUTE L outputs Lo.
12
PRE-MUTE R
O
Pre-out mute control (R)
When M MUTE R input is Lo during CD source
selected, PRE MUTE R outputs Lo.
13
IC2-SDA
I/O Data line with IC2,CD mechanism MI-COM.
14
IC2-CLK
O
Clock line with IC2,CD mechanism MI-COM.
15,16 N.C.
O
Not used(N.C.)
17
DA-SDA / DIM-CON
O
Data output to D/A converter(V-LED model)
Data line with D/A converter
/ Dimmer control output
/ Hi: Dimmer OFF, Pulse wave shape: Dimmer ON
18
TEST
-
Test terminal
Not used(Connected to GND lines)
19
P-MUTE
O
Power IC mute control output
Lo: Mute (during POWER OFF, ALL OFF, TEL
MUTE)
20
P-STBY
O
Power IC standby control output
Lo: Power IC OFF, Hi: Power IC ON, ALL OFF
mode
21
MUTE
O
IC2 mute control output
OPEN(Hi): Mute ON, Lo: Mute OFF
22,23 N.C.
O
Not used(N.C.)
24
ACC-DET
I
ACC detection terminal
Lo: ACC ON, Hi: ACC OFF
25
DIMMER
I
Small lights detection input
Lo: During vehicle small lamps turn on.
26
SW5V
O
SW 5V control output
Lo: POWER ON mode
Bass boost OFF__Hi: 160msec, Lo: 40msec
27
EXT-AMP-CONT
O
External amp. control output
Bass boost LOW__Hi: 130msec, Lo: 70msec
Bass boost HI__ Hi: 100msec, Lo: 100msec
28
P-CON
O
Power control output
Lo: POWER OFF mode, Hi: POWER ON mode
29
ANT-CON
O
Antenna control output
Hi: During TUNER mode or TI reception
30
P-ON
O
SW 14V control output
Hi: POWER ON mode
31
RESET
I
Reset input terminal
Lo: System reset
32
XT1
I
Sub clock resonator connection terminal
Clock count during POWER OFF mode
33
XT2
-
Sub clock resonator connection terminal
34
REGC
-
Capacitor conection terminal for regulator inside
microprocessor
Oscillation: POWER ON mode, Oscillation stop:
35
X2
-
Main clock resonator connection terminal
POWER OFF mode or momentary power down
detected
36
X1
I
Main clock resonator connection terminal
37
VSS
-
Ground connection terminal
Connected to GND lines.
38
VDD
-
Positive power supply connection terminal
Connected to BU 5V lines.
39
CLKOUT
O
Internal system clock output
Not used(N.C.)
40,41 N.C.
O
Not used(N.C.)
42
TYPE0
I
Destination type selection terminal 0
43
TYPE1
I
Destination type selection terminal 1
44
TYPE2
I
Destination type selection terminal 2
45
N.C.
O
Not used(N.C.)
46
IC2 TYPE0
I
IC2 setting terminal
Lo: Initial value
47
IC2 TYPE1
I
IC2 setting terminal
Lo: Initial value
48
CH-REQH
O
Request output to changers
Lo: Request

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