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CD RECEIVER
KDC-MP425/MP6026 /W6027/W6027Y
SERVICE MANUAL
KDC-MP425
Panel assy (A64-3187-12)
© 2003-12 PRINTED IN JAPAN B53-0116-00 (N) 2704
CD MECHANISM EXTENSION CORD (24P) : W05-0934-00
KDC-MP6026
Panel assy (A64-3194-12)
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KDC-W6027 /W6027Y
Panel assy (A64-3197-12)
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Plastic cabinet assy (A02-1486-13)
Mounting hardware assy (J22-0011-03)
Lever (D10-4589-04) x2
DC cord (E30-6295-05)
DC cord (E30-4958-05)
Escutcheon (B07-3098-02):KDC-MP425 (B07-3083-02):Others
Screw set (N99-1719-05)
Screw set (N99-1730-15)
Remote controller assy (RC-505) (A70-2040-05)
Size AA battery (Not suplied)
Antenna adaptor (T90-0523-05)
TDF PANEL INFORMATION
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Depends on the model. Refer to the parts list. MODEL TDF PANEL No. TDF NAME TDF-44D TDF-MP6026 TDF-W6027 KDC-MP425 Y33-1920-61 KDC-MP6026 Y33-1920-64 KDC-W6027/W6027Y Y33-1920-65
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S-METER
R DATA R CLK QUAL
NOISE
BU5V
PANEL DET
L DATAS L CLK L CE L DATAL
V DATA V CLK
O-DATA O-CLK O-CE
EJECT DSI
REMO
VOL A VOL B
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KDC-MP425/MP6026 KDC-W6027/W6027Y
AUX
2
A8V
AUX IN PRE OUT (REAR/NF) PRE OUT (REAR) 3PRE PRE OUT (FRONT) IC4 IC6 MUTE DRIVER
BU5V MODE CD,MP3 FM AM CH K,M-TYPE 3600mV 1800mV 600mV 3600mV E-TYPE 3600mV 1372mV 855mV 3600mV
IC2
FM AM AM+B SW5V A8V MP IN LEVEL E-VOL CD CH SW5V AFS QUAL FREE
PRE MUTE
TUNER
& MPX
REAR
PRE MUTE
AUDIO OUT
Q101 BUFFER
S-METER
IC7 RDS DECODER Q201 BUFFER
FRONT
PRE MUTE
PLL-DATA PLL-CLK IFC OUT
IC1
PRE MUTE MUTE P-MUTE SW5V BEEP EXT.AMP.CON
POWER IC
BACK UP
SP OUT
THERMAL PROTECT
BLOCK DIAGRAM
CD
MS DATA MS CLK SW1 SW2 SW3 SW4 M MUTE R M MUTE L M RST M STOP LO/EJ MOSW SERVO+B A8V BU5V CD MECHA+B
EXT AMP DIMMER TEL MUTE ACC DET B.U DET SURGE DET Q21 SERVO+B CD MECHA+B SERVO IC9 SW REG SW 14V
BACK UP
EXT.AMP.CON DIMMER TEL MUTE ACC BACK UP
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DIMMER
SYSTEM MICROPROCESSOR
PHONE ACC DET B.U DET PS1-0 PS1-1 PS1-2 PS2-0 PS2-2 RST
CH
REQ C CH CLK DATA H CH-CON REQ H DATA C CH RST CH MUTE BACK UP
WIRED REMO/ OPEL DISP I/F IC8 RESET
BU5V
PANEL DET S1 EJECT SW
IC1 LCD DRIVER WITH KEY MATRIX
DA CONVERTER (V-ILL ONLY) REMOCON IC2 S1 ROTARY ENCODER LCD RESET SW
IC3
AM+B FM+B A8V ILLUMI BU5V
POWER SUPPLY IC Q4
ANT CON P CON
DAUGHTER UNIT (X89- )
DSI EJECT ILLUMI
Q152 PANEL 5V
BU5V
SW 5V
SW5V
SWITCH UNIT (X16- )
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KDC-MP425/MP6026 KDC-W6027/W6027Y
DISASSEMBLY FOR REPAIR
How to Disassemble (PANEL ASSY)
1) Remove four screws (A). 2) While holding the section (B) indicated with arrows, pull and remove PANEL ASSY.
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.
A x2
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).
A x2
F G
H
B
B
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B B
J
3) Pull SWITCH UNIT (C) as indicated in the diagram and remove knob (D). (The knob (D) is attached to the rotary with hook (E) and it is not possible to remove hook (D) only.)
D E
C
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KDC-MP425/MP6026 KDC-W6027/W6027Y
COMPONENTS DESCRIPTION
● SWITCH UNIT (X16-2490-10)
Ref. No. IC1 IC2 Q2 Q3 Q4 Q5 Application / Function LCD Driver Remote Control IC REMO ON SW Key Illumination SW (Green) Key Illumination SW (Red) Dimmer Control Drives LCD Controls the unit The power supply of IC2 is turned on when base level goes “L” Lights Green key-illumination when base level goes “H” Lights Red key-illumination when base level goes “H” Lights LCD Back Light when base level goes “H” Operation / Condition / Compatibility
● ELECTRIC UNIT (X34-308x-xx)
Ref. No. IC1 IC2 Application / Function System µ-COM E.Vol & N.C.MPX Operation / Condition / Compatibility Controls FM/AM tuner, the changer, CD mechanism, Panel, volume and tone. Controls the source, volume, tone and FM multiplex detector. Bu5V (5V), Audio8V (8V), FM+B (8V), AM+B (8V), P-CON, ANT-CON SW1 1.5~3.0 3.5~5.0 IC3 Power Supply IC 7.0~ SW2 Audio ON Audio P-CON ON Audio P-CON, P-ANT ON OUT OUT
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ILL FM ON ILL AM ON
2.0~3.0 4.0~ IC4 IC6 IC7 IC8 IC9 Q1 Power IC Muting logic IC RDS decoder Reset IC SW Regulator Serge Detection
Amplifies the front L/R and the rear L/R to 50W maximum. Controls logic for muting.
“L” when detection voltage goes below 3.6V or less. Power Supply for MP3 “L” when the back-up voltage becomes more than 24V (momentary power down). “H” when the back-up voltage becomes less than 24V. “L” when B.u is present.
Q2 Q3 Q4 Q21 Q22 Q23 Q31 Q41 Q101
BACK-UP Detection “H” when B.u is absent or momentary power down is detected. ACC Detection SW 5V Servo Regulator Servo SW Control P.