© 2003-12 PRINTED IN JAPAN
B53-0117-00 (N) 2704
CD RECEIVER
KDC-MPV5025/MPV525
/MPV7026/WV6027
SERVICE MANUAL
Plastic cabinet assy
(A02-1486-13)
Lever
(D10-4589-04) x2
Screw set
(N99-1730-15)
DC cord
(E30-6295-05)
Screw set
(N99-1719-05)
Escutcheon
(B07-3001-02):KDC-WV6027
(B07-3098-02):KDC-MPV525
/MPV7026
(B07-3100-02):KDC-MPV5025
Mounting hardware assy
(J22-0011-03)
Panel assy
(A64-3186-12)
: KDC-MPV525
(A64-3188-12)
: KDC-MPV5025
Remote controller assy (RC-505)
(A70-2040-05)
CD MECHANISM EXTENSION CORD (24P) : W05-0934-00
MODEL
TDF PANEL No. TDF NAME
KDC-MPV5025
Y33-1920-62
TDF-45D
KDC-MPV525/MPV7026
Y33-1920-63
TDF-MPV7026
KDC-WV6027
Y33-1920-66
TDF-WV6027
TDF PANEL INFORMATION
KDC-MPV5025
/MPV525
Panel assy
(A64-3193-12)
KDC-MPV7026
Panel assy
(A64-3198-12)
KDC-WV6027
DC cord
(E30-4958-05)
Antenna adaptor
(T90-0523-05)
Depends on the model. Refer to the parts list.
Size AA battery
(Not suplied)
2
KDC-MP
V5025/MP
V525
KDC-MP
V
7026/WV
6027
BLOCK
DIA
GRAM
BUFFER
Q101
RDS
DECODER
IC7
Q201
BUFFER
IC1
(V-ILL ONLY)
DA CONVERTER
IC2
REMOCON
RESET SW
ENCODER
ROTARY
S1
WITH
LCD DRIVER
KEY MATRIX
IC1
LCD
PANEL DET
EJECT SW
S1
EJECT ILLUMI
DSI
SYSTEM
MICROPROCESSOR
IC2
MPX
E-VOL
&
EXT AMP
DIMMER
ACC DET
TEL MUTE
B.U DET
PRE MUTE
PRE MUTE
PRE MUTE
DRIVER
MUTE
IC6
POWER
IC
IC4
THERMAL
PROTECT
PRE OUT
(REAR/NF)
EXT.AMP.CON
DIMMER
ACC
TEL MUTE
BACK UP
AUX IN
(REAR) 3PRE
PRE OUT
(FRONT)
PRE OUT
SP OUT
SURGE DET
SW REG
CD MECHA+B
SERVO
SERVO+B
SW 14V
Q21
IC9
OPEL DISP I/F
WIRED REMO/
SUPPLY
IC
IC3
POWER
ANT CON
P CON
RESET
IC8
SW 5V
Q4
PANEL 5V
Q152
SW5V
S-METER
AUDIO OUT
IFC OUT
PLL-DATA
PLL-CLK
SW5V
AM+B
A8V
SW3
SW2
SW1
MS CLK
MS DATA
M MUTE L
SW4
M MUTE R
LO/EJ
M STOP
MOSW
M RST
SERVO+B
A8V
BU5V
CD MECHA+B
DATA C
CH MUTE
CH RST
REQ H
REQ C
CH CLK
CH-CON
DATA H
BACK UP
NOISE
QU
A
L
S-METER
R
D
ATA
R
CLK
FM
AM
MP IN
LEVEL
CD
QUAL
AFS
CH
SW5V
BU5V
P
ANEL
DET
EJECT
DSI
L
CLK
L
D
ATA
S
L
CE
L
D
A
T
A
L
VO
L
A
VO
L
B
REMO
V
D
ATA
V
CLK
O-CE
O-D
A
T
A
O-CLK
PRE MUTE
MUTE
P-MUTE
EXT.AMP.CON
DIMMER
PHONE
ACC DET
B.U DET
BEEP
PS1-0
PS1-1
PS1-2
PS2-0
PS2-2
RST
FREE
REAR
FRONT
BU5V
BACK UP
A8V
AU
X
SW5V
BACK UP
AM+B
FM+B
ILLUMI
A8V
BU5V
BU5V
BU5V
MODE
CD,MP3
FM
AM
CH
E-TYPE
3600mV
1372mV
855mV
3600mV
K,M-TYPE
3600mV
1800mV
600mV
3600mV
TUNER
CD
CH
SWITCH UNIT (X16- )
DAUGHTER UNIT
(X89- )
3
KDC-MPV5025/MPV525
KDC-MPV7026/WV6027
B
B
B
B
A x2
A x2
D
C
E
G
F
H
J
How to Disassemble (PANEL ASSY)
1) Remove four screws (A).
2) While holding the section (B) indicated with arrows, pull and
remove PANEL ASSY.
DISASSEMBLY FOR REPAIR
3) Pull SWITCH UNIT (C) as indicated in the diagram and re-
move knob (D).
(The knob (D) is attached to the rotary with hook (E) and it
is not possible to remove hook (D) only.)
How to install knob (SRC)
1) Place knob (F) and knob (G) in the positions indicated in
the diagram below.
2) While keeping these positions, use a piece of adhesive tape
(H) to hold knobs in position, as shown in the diagarma.
3) Set the rotary (J) position as shown in the diagram.
4) While keeping the letters "SRC" horizontally in position, set
it to the rotary on the panel.
5) Remove the adhesive tape (H).
4
KDC-MPV5025/MPV525
KDC-MPV7026/WV6027
SWITCH UNIT (X16-2480-20)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
LCD Driver
Drives LCD
IC2
Remote Control IC
Controls the unit
IC3
D/A Convert IC
Q2
REMO ON SW
The power supply of IC2 is turned on when base level goes "L"
Q3
Key Illumination SW (Green)
Lights Green key-illumination when base level goes "H"
Q4
Key Illumination SW (Red)
Lights Red key-illumination when base level goes "H"
Q31,34,37
Variable Illumination SW (Blue)
Lights Blue Variable illumination when base level goes 0V~5V
Q32,35,38
Variable Illumination SW (Green)
Lights Green Variable illumination when base level goes 0V~5V
Q33,36,39
Variable Illumination SW (Red)
Lights Red Variable illumination when base level goes 0V~5V
ELECTRIC UNIT (X34-308x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
System
µ-COM
Controls FM/AM tuner, the changer, CD mechanism, Panel, volume and tone.
IC2
E.Vol & N.C.MPX
Controls the source, volume, tone and FM multiplex detector.
Bu5V (5V), Audio8V (8V), FM+B (8V), AM+B (8V), P-CON, ANT-CON
IC3
Power Supply IC
IC4
Power IC
Amplifies the front L/R and the rear L/R to 50W maximum.
IC6
Muting logic IC
Controls logic for muting.
IC7
RDS decoder
IC8
Reset IC
"L" when detection voltage goes below 3.6V or less.
IC9
SW Regulator
Power Supply for MP3
Q1
Serge Detection
"L" when the back-up voltage becomes more than 24V (momentary power down).
"H" when the back-up voltage becomes less than 24V.
Q2
BACK-UP Detection
"L" when B.u is present.
"H" when B.u is absent or momentary power down is detected.
Q3
ACC Detection
"L" when Acc is present.
Q4
SW 5V
ON when the base is "L".
Q21
Servo Regulator
Q22
Servo SW
Q23
Control Power Supply IC
Q31
Dimmer Control
Dimmer ON when the base is "H".
COMPONENTS DESCRIPTION
SW1
OUT
1.5~3.0
Audio ON
3.5~5.0
Audio P-CON ON
7.0~
Audio P-CON, P-ANT ON
SW2
OUT
2.0~3.0
ILL FM ON
4.0~
ILL AM ON
5
KDC-MPV5025/MPV525
KDC-MPV7026/WV6027
Ref. No.
Application / Function
Operation / Condition / Compatibility
Q41
SW Regulator Control
Q101
Composite signal buffer
DSI lights when the base is "L".
Q151
DSI Driver
DSI turns off when the base is "H".
DSI turns on and off when panel is taken off.
Q152
Panel 5V SW
When the panel is attached, the base goes "L", turning the Tr ON to supply 5V to the panel.
When panel is taken off, panel 5V cut off.
Q153,154
ILL Control
ILL lights when the base of Q153 is "H".
Q201
Noise buffer
Q350
Pre and NF Mute SW
Drives the Pre and NF Mute sw (Q351,355) when the base is "L".
(not always Pre and NF)
Q351
Pre / NF Mute SW
Mutes the Pre Rear Lch or NF Lch when the base is "H".
Q352
Pre / NF Mute SW
Mutes the Pre Rear Rch or NF Rch when the base is "H".
Q354
Pre and NF Mute SW
Drives the Pre and NF Mute sw (Q352,356) when the base is "L".
(not always Pre and NF)
Q355
Pre Mute SW
Mutes the Front Lch when the base is "H".
Q356
Pre Mute SW
Mutes the Front Rch when the base is "H".
COMPONENTS DESCRIPTION
SYSTEM MICROCOMPUTER : UPD703030GC044 (X34 : IC1)
Pin No.
Pin Name
I/O
Application
Truth
Processing Operation Description
value table
1
PLL CLK
I/O
CLK output terminal to F/E
2
Not used
O
3PANEL-DET
I
Panel DET terminal
No panel DET : L, Panel DET : H
4
IC2 SDA
I/O
DATA input/output terminal with E-VOL
5
IC2 SCL
I/O
CLK output terminal to E-VOL
6
VDD
-
7
VSS
-
8
FLIP-DET
I
Flip DET terminal
L : Panel DET, H : Panel flippable
9
BEEP
O
BEEP output terminal
10
REMO
I
Remote control input
11
R QUAL
I
RDS decoder QUAL input terminal
Not used
O
Destination other than E and E2
MICROCOMPUTER'S TERMINAL DESCRIPTION