Kenwood KDC-M6021/G Service Manual

CD RECEIVER

KDC-M6021/G

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SERVICE MANUAL

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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 (X92-4460-0x : B51-7891-00).

TEL [phone] QQ 376315150 892498299

KDC-M6021

KDC-M6021G

Front glass
(B10-4179-01)

Front glass
(B10-4195-01)

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© 2002-1 PRINTED IN JAPAN

B51-7894-00 (S) 1928

Panel assy
(A64-2601-02)

Panel assy
(A64-2606-02)

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Mounting hardware assy
(J21-9716-03)

DC cord
(E30-4958-05)

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Escutcheon
(B07-3055-02): KDC-M6021
(B07-3054-02): KDC-M6021G

Plastic cabinet assy
(A02-1486-13)

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Screw set
(N99-1656-05)

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Lever
(D10-4589-04)x2

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Antenna adaptor
(T90-0523/0534-05)

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CH

CD MECHA

F/E

FM+B

PLL+B

AM+B

BUFF

E-VOL

SYSTEM
MI-COM

DECODER

RDS

MP3
NORMAL

WIRED
OEM DISP

RST IC

DET

FLIP

LCD (NEGA)

MATRIX

KEY

G/R SW

RST SW

REMO ON

BACKLIGHT

LCD
W-ILL

DRIVER

LCD

REMO

GUIDE
ILL SW

OPEN

OUT

REMO/

BU5VSW5V

SERVO
+B

PANEL

2WAY MUTE

ACC DET

DIMMER

TEL-MUTE

ACC

DIMMER

POWER IC

SP OUT

MUTE PRE OUT (FRONT)

MUTE PRE OUT (NF/REAR)

MUTE

DRIVER

OP AMP

SWITCHED

PROTECTION

THERMAL

NOISE
BUFFER

5V

BU DET

SW14V

A8V

CD
MACHA+B

ILLUMI

+B

(for MP3)

EJECT ILL/DSI
(SW AND LED)

EJECT KEY

X89-252

BACK UP

P-CON

P-CON

Q45,47
Q46,48

IC7

IC1

& N.C. MPX

IC2

Q52

IC8

Q54 S1

AVR

LCD

ED1

Q7

Q3,4

IC2

Q6

IC1

Q5

Q16,17

Q18

Q14,15

IC11,Q51

Q19-22

Q33

Q34

Q26

Q13 Q11,12

Q55

Q27,29,30,32

IC6

Q43

Q7,8

IC4

Q5,6

Q1,2

IC3,

ANT-CON

DATA C

CH-CON

DATA H

REQ H

RST
CLK

REQ C

CD MECHA+B

SERVO+B

PLL DATA

PLL CLK

M STOP

M RST

SW4

MUTE R

MUTE L

LO/EJ

MOSW

SW2
SW3

SW1

S-METER

IFC OUT

SW5V

3

PANEL DET

GUIDE ILL

MP IN

AFS

LEVEL

RDDA

FM

AM

A 8V

(for MP3)
BU5V

A8V

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2

2
3

10

7

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SW5V

10

SDA

SCL

AUDIO OUT

7

BACK UP

3

2

O-CLK
O-DATA

O-CE

REMO

RESET

BU5V

MUTE
DRIVER

PANEL5V

PANEL5V

5

CD

AM+B

FM+B

S-METER

RDCK

RQUAL

BU5V

5

BU5V

FLIP DET

L DATAS

L CE

L CLK

L DATAL

L-INH

DIMMER-CON

EJECT

EJECT ILLUMI/DSI

ILL ON

CD MECHA+B

SW5V

(E) TYPE

CD (MP3,NORMAL)

3600mVCHANGER

FM
AM

1372mV

855mV

3600mV

2

2

BU5V

8

2

2

2

QUAL

S MUTE

REAR L/R

FRONT L/R

AFS

NOISE

N/F SW

PRE MUTE

N/F MUTE

P MUTE

MUTE

BEEP

BU5V

MUTE
DRIVER

P-ON

PANEL5V

SW5V

CH-AUX

MODE

PRE OUT OUTPUT VOLTAGE

DIMMER

PHONE

ACC DET

BU DET

251mV

230mV

1200mV

(MP3,NORMAL)

1200mV

KDC-M6021/G

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BLOCK DIAGRAM

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KDC-M6021/G

COMPONENT DESCRIPTION

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● SWITCH UNIT (X16-1662-70)

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

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● ELECTRIC UNIT (X25-9202-71)

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

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IC1 LC75808W
IC2 RS-171

Q1 DTA114EUA Key permission SW For the key scanning start and the key detection SW
Q3 2SD2114K
Q4 2SD2114K
Q5 2SC4081 VLCD AVR For LCD driver IC
Q6 DTA114EUA REMO SW

Q7 2SC4081 Dimmer SW

IC1 UPD703030GFA03 System MI-COM.
IC2 TDA7407D E.VOL & N.C.MPX IC
IC3 TC74HC02AF Mute logic 2-input NOR x 4
IC4 TA8273H Power IC
IC6 NJM2123V-TE2 Switched Op. Amp.
IC7 SAA6581T RDS decoder
IC8 S-80837ANNP Reset IC When BU 5V voltage is less than 3.7V, IC outputs Lo.

IC11 SI-8050JD CD+5V AVR DC/DC converter

Q1 DTC143TUA Audio mute SW When a base goes Hi, Front R Ch. pre-out is muted.
Q2 DTC143TUA Audio mute SW When a base goes Hi, Front L Ch. pre-out is muted.
Q5 2SD2114K Audio mute SW When a base goes Hi, NON-F R Ch. pre-out is muted.
Q6 2SD2114K Audio mute SW When a base goes Hi, NON-F L Ch. pre-out is muted.

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Q7 DTA124EUA

Q8 DTA124EUA
Q11 2SC4081
Q12 2SA2057 Q11 and Q12 are inverted Darlington connection.

Q13 2SA1576A SW 5V
Q14 2SC4081

Q15 2SA2057 Q14 and Q15 are inverted Darlington connection.
Q16 DTC124EUA

Q17 DTA124EUA
Q18 2SD2375 SERVO +B AVR When Q18's base goes Hi, SERVO +B AVR outputs +7.6V.

Q19 DTC124EUA
Q20 DTA124EUA While Q19's base goes Hi, Q20 is turned on, and ILL +B AVR is working.
Q21 2SB1184
Q22 2SC4081 Q21 and Q22 are inverted Darlington connection.

Q26 DTC144EUA
Q27 DTC114YUA

Q32
Q29 DTA124EUA
Q30 2SA1576A P-CON. protection SW Protect Q32 by turning ON when P-CON output is grounded.

Q33 2SC4081 BU detection SW When momentary power down has detected, a base goes Lo, and

Q34 2SC4081 ACC detection SW While ACC is applied, a base goes Hi, and Q34 is turned on.
Q42 DTC124EUA E. VOL. mute SW
Q43 DTC143TUA Noise buffer

Q45 DTC124EUA
Q47

2SB1277(Q,R) or 2SB1434

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2SB1277(Q,R) or 2SB1434

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When a base goes Hi, RED LEDs are turned on.
When a base goes Hi, GREEN LEDs are turned on.

While a base goes Lo, PAN 5V is supplied to the remote control sensor IC.
Usually Q7's base goes Hi. When DIMMER mode is selected, pulse
wave shape is applied to Q7's base.

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When a base goes Lo, Q7 is turned on for driving NON-F mute SW.
When a base goes Lo, Q8 is turned on for driving Front mute SW.
While BACKUP is applied, BU 5V AVR outputs +5V.

While a base goes Lo, SW 5V is supplied to the microprocessor
peripheral circuits.
When Q14's base goes Hi, Q15 is turned on, and A.+8V AVR outputs +8.3V.

A.+8V AVR and SERVO +B AVR ON/OFF control

SERVO +B AVR are working.

ILL +B AVR ON/OFF control

While Q22's base goes Hi, Q21 is turned on, and AVR outputs +10.7V.

When vehicle small lamps turn on, Q26's base goes Hi, and Q26 is
turned on .
When Q27's base goes Hi, Q32 is turned on.
Works during POWER ON mode.
Prevents Q30 tuning ON during start-up after power ON.

While BACKUP is applied, a base goes Hi, and Q33 is turned on.

Q33 is turned off.

When BU detection SW or MI-COM.'s mute is working, a base goes
Hi, and Q42 is turned on.

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When Q45's base goes Hi, Q47 is turned on, and A.+8V is supplied to
the F/E. Works during FM reception mode or RDS reception mode.

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LCD driver with key matrix
Remote control sensor IC

Key illumination red SW
Key illumination green SW

Mute driver for pre-out mute SW
Mute driver for pre-out mute SW

BU 5V AVR

A.+8V AVR

SW14V While Q16's base goes Hi, Q17 is turned on, and A.+8V AVR and

ILL +B AVR SW

ILL +B AVR

Small lamp detection SW

P-CON SW
P-CON. protection inhibit SW

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FM+B SW

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KDC-M6021/G

COMPONENT DESCRIPTION

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

Q46 DTC124EUA
Q48
Q51 2SC4081 CD+5V AVR SW When a base goes Hi, CD+5V AVR is working.
Q52 DTC143TUA
Q53 DTA114YUA
Q54 DTA114YUA Guide illumination SW When a base goes Lo, Q54 is turned on.
Q55 2SA1576A Panel 5V SW When a base goes Lo, Q55 is turned on.

TEL [phone] QQ 376315150 892498299

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2SB1277(Q,R) or 2SB1434

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AM+B SW

Composite signal buffer
EJECT illumination/DSI SW

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When Q46's base goes Hi, Q48 is turned on, and A.+8V is supplied to
the F/E. Works during AM reception mode.

When a base goes Lo, Q53 is turned on.

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KDC-M6021/G

MICROCOMPUTER'S TERMINAL DESCRIPTION

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● IC1 (ELECTRIC UNIT : X25-9202-71)

TEL [phone] QQ 376315150 892498299

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Pin No.

Pin Name I/O Description Processing Operation

1 L-DATAS O Data line to LCD driver
2 L-CLK O Clock output to LCD driver
3 PLL-DATA I/O Data input/output terminal with F/E
4 PLL-CLK I/O Clock output to F/E
5 AM+B I/O AM+B control Hi: During AM reception

6 FM+B I/O FM+B control
7 CH-CON O Changer control output Lo: Standby mode, Hi: Operation mode

8 CH-RST O Reset output to changers : Reset

9 EVDD - Positive power supply connection terminal Connected to BU 5V lines.
10 EVSS - Ground connection terminal Connected to GND lines.
11 AFS O Noise detection time constant switching terminal
12 BEEP O BEEP sound output

13 REMO I
14 AUX SW I/O CH/AUX inputs selector terminal Not used(N.C.)
15 N/F SW O N/F selector terminal
16 IC2-SDA I/O Data line with IC2,CD mechanism MI-COM.

17 IC2-SCL I/O Clock line with IC2,CD mechanism MI-COM.
18 PRE-MUTE I/O Pre-out mute control terminal

19 N/F-MUTE O N-F pre-out mute control terminal
20

DIMMER-CON
21 TEST - Test terminal Not used(Connected to GND lines)
22 SVR O Power IC SVR control output Not used(N.C.)
23 P-MUTE O Power IC mute output
24 P-STBY O Power IC STBY control output Hi: Power IC on, ALL OFF mode, Lo: Power IC off
25 MUTE O Mute control output Lo: Mute off, Open: Mute on
26 SW5V I/O SW5V control terminal Lo: SW5V on, Hi-Z: SW5V off

27 BU DET I Momentary power down detection input
28 ACC DET I ACC detection terminal Hi: ACC OFF, Lo: ACC ON

29 N.C O Not used(N.C.)
30 DIMMER I Small lights detection input Lo: During vehicle small lamps turn on.
31 N.C O Not used(N.C.)

32 P-CON I/O Power control output

33 ANT-CON O Antenna control output
34 RESET I Reset input terminal Lo: System reset

35 XT1 I Sub clock resonator connection terminal Clock count during POWER OFF mode
36 XT2 - Sub clock resonator connection terminal
37 REGC -

38 X2 - Main clock resonator connection terminal
39 X1 I Main clock resonator connection terminal

40 VSS - Ground connection terminal Connected to GND lines.
41 VDD - Positive power supply connection terminal Connected to BU 5V lines.
42 CLKOUT O Internal system clock output Not used(N.C.)
43
44 P-ON I/O SW14V control terminal Lo: POWER OFF mode, Hi: POWER ON mode
45 O-DATA I/O Data line with the external display device Lo: The model without the external display device
46 O-CLK I/O Clock line with the external display device Lo: The model without the external display device
47 O-CE I/O CE line with the external display device Lo: The model without the external display device
48 N.C O Not used(N.C.)

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CD MECH +B

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O Dimmer control output Hi: Dimmer OFF, Pulse wave shape: Dimmer ON

I/O MP3 CD mechanism power supply control output Lo: Power supply on, Hi-Z: Power supply off

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Data input from the remote control light sensor or
wired remote control

Capacitor conection terminal for regulator inside microprocessor

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Hi: During FM reception, Hi: During FM reception
if with RDS, RDBS

Hi: During FM reception, Lo: During FM seek or AF search

Hi: Rear/N-F pre-outs are selected to Front output.
Lo: Rear/N-F pre-outs are selected to Rear output.

Lo: When momentary power down detected, when
M-MUTE input is Lo.
Lo: When momentary power down detected, N-F pre­outputs selecting or OFF, when M-MUTE inputs is Lo.

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Lo: ALL OFF mode, POWER OFF mode, TEL MUTE on

Hi : When momentary power down detected or BU OFF
Lo : BU ON

Hi-Z: POWER OFF mode, ALL OFF mode, Hi:
POWER ON mode
Hi: During TUNER mode, TI reception mode, last
FM mode

Oscillation: POWER ON mode, Oscillation stop:
POWER OFF mode or momentary power down detected

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KDC-M6021/G

MICROCOMPUTER'S TERMINAL DESCRIPTION

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Pin No.

49 TYPE0 I Destination type selection terminal 0
50 TYPE1 I Destination type selection terminal 1
51 TYPE2 I Destination type selection terminal 2
52 IC2 TYPE0 I IC2 setting terminal Lo: Initial value
53 IC2 TYPE1 I IC2 setting terminal Lo: Initial value
54 PANEL DET I Panel detaching detection input Lo: Panel attached, Hi: Panel detached

55 GUIDE ILL O Guide illumination control output Lights-on: Panel tilted

56 M-MUTE L I

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57 M-MUTE R I
58 BVDD - Positive power supply connection terminal Connected to BU 5V lines.
59 BVSS - Ground connection terminal Connected to GND lines.
60 M RST O Reset output to CD mechanism MI-COM. Lo: Reset
61 M STOP O Stop request to CD mechanism MI-COM. Lo: Stop mode, Hi: Operation mode
62 N.C O Not used(N.C.)
63 CD SW3 I CD down SW detection input Hi: Chucking
64 LO/EJ I/O CD mechanism loading/Eject switching output Hi: Eject, Lo: Loading, Hi-Z: Stop or Break
65 MOSW O CD mechanism loading motor control output Hi: CD loading/eject action or Break, Lo: other
66 V-ILL CLK I/O

67 L INH O INH output to LCD driver IC
68 V-ILL DATA I/O

69 L CE O CE output to LCD driver IC
70 PANEL 5V I/O Panel 5V control terminal Lo: 5V on, Hi-Z: 5V off
71 ILL ON I/O ILL+B control terminal Hi: ILL+B on, Hi-Z: ILL+B off

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73 AVCONT O A/D converter reference voltage control output Hi: Active, Connected to AVREF terminal
74 AVDD - Positive power supply connection terminal Connected to BU 5V lines.
75 AVSS - Ground connection terminal Connected to GND lines.
76 AVREF I A/D converter reference voltage input terminal
77 PHONE I PHONE detection input
78
79 N.C I Not used(pull down to GND lines)
80 N.C I Not used(pull down to GND lines)
81 FLIP DET I
82 N.C I Not used(pull down to GND lines)
83 NOISE I FM noise detection input
84 S-METER I S-meter input from F/E
85 R-DATA I Data input from the RDS decoder IC
86 R-QUAL I Quality input from the RDS decoder IC
87 IFC-OUT I F/E IFC OUT input terminal Hi: Station detected (Vth=2.5V)
88 CH-MUTE I Mute request from changers Hi: Mute request
89 CH-REQH O Request output to changers Lo: Request
90 R-CLK I Clock input from the RDS decoder IC
91 CH-REQC I Request input from changers Lo: Request
92 KEY-REQ I Communication request from LCD driver IC
93 CD SW1 I Loading SW detection input Lo: Loading start
94 CD SW2 I 12cm disc detection SW input Lo: 12cm disc detected
95 EJECT I Eject key detection input Lo: Eject key on
96 CD SW4 I 8cm disc detection SW input Not used(N.C.)
97 CH-DATAC I Data input from changers
98 CH-DATAH O Data output to changers
99 CH-CLK I/O Clock input/output with changers

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100 L DATAL I Data input from the LCD driver IC

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Pin Name I/O Description Processing Operation

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EJECT ILL/DSI

E2PROM DET

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Mute request (L Ch.) from CD MECHA. MI-COM.
Mute request (R Ch.) from CD MECHA. MI-COM.

Clock line with the D/A converter for variable illumination

Data line with the D/A converter for variable illumination

I/O Eject key illumination control terminal

I EEPROM detection input Lo: No EEPROM, Hi: EEPROM

Panel connector removing and installing detection input

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Lo: Illmination on, Hi-Z: Illumination off

Lights-out: Panel detached
Lo: Mute request
Lo: Mute request

Not used(N.C.)
Lo: When momentary power down detected or
Reset
Not used(N.C.)

Lo: Illmination on, Hi-Z: Illumination off

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Lights-on at the panel tilted during POWER ON mode
Flashing at the panel detached during POWER ON mode

1V or less: TEL MUTE, 2.5V or greater: NAVI MUTE

Lo: Panel attached normally, Hi: Panel detached or tilted

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