Kenwood KDC-MP6025, KDC-MP625, KDC-MP858 Service Manual

CD RECEIVER

KDC-MP6025/MP625
/MP858
/W6527/W6527Y

SERVICE MANUAL

CD MECHANISM EXTENSION CORD (24P) : W05-0935-00

© 2004-1 PRINTED IN JAPAN
B53-0124-00 (N) 2704

KDC-MP6025
KDC-MP625

Panel assy
(A64-3213-02) :K2
(A64-3214-02) :K3

KDC-MP858

Panel assy
(A64-3215-02)

KDC-W6527
KDC-W6527Y

Panel assy
(A64-3217-02)

(K3)
(K2)

Escutcheon
(B07-3098-02) :K2
(B07-3100-02) :K3

(M1)

Escutcheon
(B07-3098-02)

(E)

(E1)

Escutcheon
(B07-3083-02)

Plastic cabinet assy
(A02-2732-03)

Remote controller assy (RC-505)
(A70-2059-05) :K2K3M1

Size AA battery
(Not suplied) :K2K3M1

Lever
(D10-4589-04)

Mounting hardware assy

x2

Remote controller assy (RC-420)
(A70-2055-05) :EE1

TDF PANEL INFORMATION

MODEL TDF PANEL No. TDF NAME
KDC-MP625/MP858 Y33-1990-61 TDF-46D

KDC-MP6025 Y33-1990-62 TDF-46DB
KDC-W6527/W6527Y Y33-1990-63 TDF-W6527

(J21-9716-03)

Screw
(N09-6212-05)

DC cord
(E30-6294-05) :M1
(E30-6295-05) :K2K3

Screw set
(N99-1723-05) :K2K3M1

DC cord
(E30-6063-15) :EE1

Antenna adaptor
(T90-0523-05) :EE1

KDC-MP6025/MP625/MP858

BU

BU

SW5

BU5

SW3

F+/F-

FL+B

RDS

F/E

LX-BUS

DISP

OPEL-

AUX

PANEL­MECHA

CD
DXM6540W

INGAIN

STD

MAIN

SUB

PHONE
/NAVI

INPUT-MPX

INGAIN

+

TREBLE

BASS

VOLUME

MID

0

AUTOZER

OUT-SEL SOFT

MUTE

FRONT
REAR
NF/R

FRONT
REAR
NF

FADER

DC
DET

OFFSET

E'S LIGHT

C/R : DISCREET

E-VOL

PW-IC

PRE-OUT

PRE-OUT

SP-OUT

MUTE

MUTE

ACCACC-DET

REG.ANT-SW

SERVO

CD

REG. P-CON

REG. BU

SW BU5V

REG.

DC/DC

SW11V

FL
F+/F-

FL +B

SW5V

MECHA

PANEL
DRIVER+B

BU5V

ILL+B

A8V

CD-4.7V BU-DET

ANT-CON

SYSTEM u-COM

REMO

KEY
MATRIX

u-COM

PANEL

SHIFT

LEVEL

FL

SW

IC4

Q49,50

Q47,48

Q36

SW REG.

Q27Q25Q10,11Q7,9

IC13

IC19

Q3 Q1,2

A1

IC20 Q15,16

IC7

Q35

IC3,Q8

Q3ED1

IC1IC3

IC1

A2

IC12

IC2

Q58,59

MUTE

MUTE

Q56,57

METER

LEVEL

IC14

(E type ONLY)

(E type ONLY)

BU5
CD SERVO

MPX

AUX
CH

CD

NAVI

CH/AUX

AC IN0

AC IN1

AC IN2

AC IN3

AC OUT

SUB

IN1 : HPF
IN2 : 2ZONE
IN3 : LPF

ACIN 3+LPF
: FREE ONLY

HPF

NF

FR

NO HPF
F/R/NF

DC

MUTE L/R

FRONT

MUTE L/R

REAR/NF

R/L
R/R
F/L
F/R

MONO 2ch

PON P-CON

PON

PON CD/MD

PON

AUDIO

PWIC
POWER

DET

PON ILL

TYPE

PANEL

FL+B

2ZONE

(X34- )

(X16-251)

2

KDC-W6527/W6527Y

BLOCK DIAGRAM

KDC-MP6025/MP625/MP858
KDC-W6527/W6527Y

COMPONENTS DESCRIPTION

● SUB-CIRCUIT UNIT (X16-2510-10/X16-2722-70)

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

IC1 Panel µcom
IC2 3.3V Regulater The power supply of IC and VFD (Logic) which are driven by 3.3V
IC3 Remote Control IC
IC4 Buffer IC It is change into 3.3V from 5V
Q1 FL BLK SW VFD is turned on when Q1’s base level goes “H”
Q2,3 FL+B SW FL+B (VDD2) is turned on when Q2’s base level goes “H”
Q4 SW5V The power supply of IC3 is turned on when Q4’s base level goes “L”
Q6 ∇ LED SW ∇ LED is turned on when Q6’s base level goes “H”
Q7,9 Red LED SW RED LED is turned on when Q7’s base level goes “L”
Q8,10 Green LED SW GREEN LED is turned on when Q8’s base level goes “L”
Q11,12 Blue LED SW BLUE LED is turned on when Q11’s base level goes “L”

● ELECTRIC UNIT (X34-301x-xx/X34-3222-70)

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

IC1 System µCOM Controls FM/AM tuner, the changer, CD/MD mechanism, Panel, volume and tone.
IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector
IC3 A8V Ref Power Supply Output 1.27V
IC4 Power IC Amplifies the front L/R and the rear L/R to 50W or 47W maximum.
IC7 SW Regulator Power Supply for mp3
IC10 Muting logic IC Controls logic for muting.
IC11 Reset IC “L” when detection voltage goes below 3.6V or less.
IC12 RDS decoder

IN

IN1 IN2

IC13 Panel mecha motor driver Panel mecha control

IC14 Level meter Buffer The signal of IC2 is sent to Panel µcom
IC20 SW Regulator Power Supply for VFD
Q1,2 B.U.5V AVR While BU is applied, BU5V AVR outputs +5V.
Q3,4 SW5V When Q4’base goes Hi, SW5V outputs +5V.
Q5 SW14V When Q5’2pin goes Hi, SW14V outputs 14V.
Q6,8 AUDIO8V AVR When Q6’2in goes Hi, A8V AVR outputs 8.0V.
Q7,9 SERVO+B AVR When Q9’base goes Hi, S+B AVR outputs 7.5V.
Q10,11 SERVO+B AVR (Panel Mecha) When Q10’base goes Hi, S+B AVR outputs 8.5V.
Q12 SW for IC7 When Q12’base gose Lo, IC7 is turned on.

LL WAIT
LH OPEN
HL CLOSE
HH STOP

Panel mecha

3

KDC-MP6025/MP625/MP858
KDC-W6527/W6527Y

COMPONENTS DESCRIPTION

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

Q13,15,16 FL&ILL AVR When Q13’2pin goes Hi, ILL AVR outputs 10.5V.
Q25,26 P-ANT SW When Q23’base goes Hi, P-ANT SW outputs 14V.
Q27,30 P-CON SW When Q30’base goes Hi, AVR outputs 14V.
Q28,29 P-CON Protection Protect Q27 by turning on when P-CON output is grounded.
Q31 Ex Amp Control Buffer
Q32 Small lamp det SW When Q32’base goes Hi, Q32 is turned on.
Q33,34 SERGE Det. When Q33’base goes Hi, IC4 is changed into a standby state.
Q35 BU det When Q35’base gose Hi, Q27 is turned on.
Q36 ACC det When Q36’base gose Hi, Q29 is turned on.
Q37,38 Pre-out mute driver When a base gose Lo, mute driver is turned on.
Q39 Sub-out mute driver When a base gose Lo, mute driver is turned on.
Q40 AC-out mute driver When a base gose Lo, mute driver is turned on.
Q41,42 AM+B SW When Q42’base gose Hi, AM+B is out.
Q43 Composite signal buffer for RDS

DSI lights when the base is “L”.

Q44 DSI Driver DSI turns off when the base is “H”.

DSI turns on and off when panel is taken off.
Q45,46 Panel 5V SW When Q46’base gose Hi, PANEL 5V is out.
Q47~50 Pre-out mute SW When a base gose Hi, Pre-out is muted.
Q55 Noise buffer RDS Noise
Q56,57 AC-out mute SW When a base gose Hi, AC-out is muted.
Q58,59 Sub-out mute SW When a base gose Hi, Sub-out is muted.
Q60 Level meter mute SW When a base gose Hi, Level meter is muted.

4