Kenwood KD-CW-4527 Service Manual

CD RECEIVER

KDC-MP 225 KDC-MP4026/G KDC-W4527/G/GY/Y KDC-W427

SERVICE MANUAL

Panel assy KDC-MP225 (A64-3170-02)

AUTO

AME

OFF

AUD

Panel assy KDC-MP4026 (A64-3174-02) KDC-MP4026G(A64-3175-02)

AUD

AUTO

AME

OFF

Front glass KDC-MP225 (B10-4464-01)

SCAN

RDM REP

Front glass KDC-MP4026 (B10-4468-01) KDC-MP4026G(B10-4469-01)

SCAN

RDM REP

CD mechanism extension cord (24PIN) : W05-0934-00

Panel assy KDC-W4527/Y (A64-3172-02) KDC-W4527G/GY(A64-3173-02)

C.S.

SCRL

M.RDM

DISP MENU

F.SEL

VOL

ADJ

OFF

AUD

Panel assy KDC-W427 (A64-3336-02)

SCRL

M.RDM

DISP MENU

F.SEL

AUD

AUTO

AME

OFF

Front glass KDC-W4527/Y (B10-4466-01) KDC-W4527G/GY(B10-4467-01)

SCRL

M.RDM

SCAN

RDM REP

DISP MENU

F.SEL

Front glass KDC-W427 (B10-4555-01)

SCRL

SCAN

RDM REP

DISP MENU

F.SEL

PTY

* DC cord (E30-6322-05) (E30-6323-05)

* Escutcheon (B07-3001-02)

* DC cord (E30-6132-05) (E30-6286-05)

Mounting hardware assy (J21-9716-03)

(B07-3098-02)

* Depends on model. Refer to the parts list.

* Antenna adaptor (T90-0523-05)

Plastic cabinet assy (A02-1486-13)

TDF PANEL INFORMATION MODEL PARTS NO. PANEL NAME KDC-MP225 Y33-1940-60 TDF-42D KDC-MP4026 Y33-1940-67 TDF-MP4026 KDC-MP4026G Y33-1940-63 TDF-MP4026G KDC-W4527/Y Y33-1940-64 TDF-W4527 KDC-W4527G/GY Y33-1940-65 TDF-W4527G KDC-W427Y Y33-1940-66 TDF-W427Y

* Screw set (N99-1719-05)

* Screw (N84-4016-46)

Lever (D10-4589-04) x 2

* Remote controller assy (A70-2040-05) : RC-505

* Not supplied

S7V

A8V

BU5V

D5V

A3.3V

SW3.3V

BU3.3V

BU2.5V

CD PLAYER UNIT (X32-5500-00)

IC1

MECHANISM CONTROL

APC

Q9,10

C-SW

IC4

4ch BTL DRIVER

DM1

DM2

SPINDLE MOTOR

LOADING MOTOR

& SLED

IC9

DAC 3.3V AVR

Q3,5,6

(0-01)ONLY

LEVEL SHIFT

Q1,4

LEVEL SHIFT

MICROPROCESSOR

AVR

BU 3.3V

IC6

DAC 3.3V AVR

IC7

SW 3.3V AVR

IC5

LEVEL SHIFT

IC3

MP3/WMA DECODER

IC2

PROCESSOR

RF AMP/SERVO CD SIGNAL

BUFFER

IC8

FO COIL

TR COIL

(OPTICAL PICKUP)

DPU1

CN2

CN1

DGND

DATA

CLK

MUTER

MUTEL

MSTOP

MRST

LOS

8EJE

A8V

AGND

DOUT

MOTOR

LO/EJ

SGND

S7V

12EJE

LOE/LIM

16.00MHz

16.898MHz

OPEN

DGND

BU5

VREF

SLD

TRK

FCS

SPD

516

PON

KDC-MP225,MP4026/G

KDC-W4527/G/GY/Y,W427Y

BLOCK DIAGRAM

1200mV

DXM-6060

DXM-6560

DXM-6540 : 810mV

: 1200mV : 1200mV

1Vpp@75

Term.

SWITCH UNIT (X16- )

TUNER

CD/VCD

BUFFER

RDS DECODER

BUFFER

EEPROM

REMOCON

RESET SW

WITH

LCD DRIVER KEY MATRIX

LCD

DSI

SYSTEM

MPX

E-VOL

ACC DET

TEL MUTE

B.U DET

PRE MUTE

DRIVER

MUTE

POWER IC

THERMAL PROTECT

ACC

TEL MUTE

BACK UP

(REAR)

PRE OUT

SP OUT

SURGE DET

SERVOSERVO+B

SW 14V

WIRED REMO

SUPPLY IC

POWER

ANT CON P CON

RESET

SW 5V

PANEL 5V

SW5V

ILL SW

ILLUMI

IC7

IC2

IC1

IC4

IC3

IC8

IC1

IC2

ANALOG

AUX IN

AUDIO

PARK SW

MICROPROCESSOR

MECHA+B MECHA +B

VIDEO OUT

IC9

IC6

to VIDEO OUT

TUN SMETER

AUDIO OUT

TUN IFC OUT

TUN SCL TUN SDA

SW5V

AM+B

A8V

CD DISC8 SW

CD DISC12 SW

CD LOS SW

CD SDA

CD SCL

CD LOE LIM SW

CD MUTE L

CD LOEJ

CD MSTOP

CD MRST

SERVO+B

A8V BU5V

MECHA+B

LX DATA S

LX MUTE

LX RST

LX REQ M

LX REQ S

LX CLK

LX COM

LX DATA M

BACK UP

RDS QUAL

S-METER

RDS DATA

RDS CLK

FM AM MP LEVEL CD

QUAL

AFS

SW5V

BU5V

DSI

L CLK

L DATAS

L CE

L DATAL

REMO

MUTE

PWIC MUTE

LINE MUTE

ACC DE

B.U DET

PWIC BEEP

RST

BU5V

A8V

SW5V

AM+B

ILLUMI

A8V

BU5V

MODE

FM AM

MP3

E-TYPE 1372mV

855mV

3600mV

K-TYPE 1800mV

600mV

3600mV

PWIC STBY

BU5V

TDF DET

SW5V

AUD SCL AUD SDA

A8V

PON 5

PARK SW

MUTE PRE

PS2-1

PS1-0

PS2-0

PS1-2

PS1-1

PON CD

A8V

CD MOTOR

CD MUTE R

VIDEO OUT

AUX SW

RDS AFS

RDS NOISE

SW5V

L RST

KEY REQ

BU5V

ELECTRIC UNIT (X25-)

BLOCK DIAGRAM

KDC-MP225,MP4026/G

KDC-W4527/G/GY/Y,W427Y

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

COMPONENTS DESCRIPTION

● SWITCH UNIT (X16-2640-xx/2642-xx/2652-xx)

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

IC1 LCD driver Drive for LCD unit IC2 Remote control IC Receiving for the remote control unit Q1 KEY scan detector key scan start at base gose “L”. Q2 key illumination SW Lights up for RED key illumination when base voltage level goes “H” Q3 key illumination SW Lights up for GREEN key illumination when base voltage level goes “H”

● ELECTRIC UNIT (X25-9980-xx/9982-xx/X34-3172-70)

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

IC1 System microcomputer IC2 Electronic volume & N.C.MPX Control for source selector, volume & tone, and FM multiplex detector.

Control for TUNER unit, CD mechanism, volume & tone, LCD driver and external CD changer unit

Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con)

SW1 OUT

1.5~3.0V Audio ON

3.5~5.0V Audio P-con ON

IC3 Power supply IC

IC4 Audio power amp IC Amplifier for audio signal to derive for 4channel speakers (50W maximum for each channel) IC6 Muting control IC Control for timing for mute IC7 RDS decoder Decode for RDS signal IC8 Reset IC When detection voltage goes below 3.5V or less Reset IC output change to “L” signal IC9 Switching regulator Power supply for CD mecanism unit

Q1 Serge detection

Q2 Backup detection

Q3 ACC detection When ACC voltage supplied output is “L” Q4 SW 5V When base voltage is “L” Q4 is ON Q21,24 AVR Servo regulator Q22 SW Servo SW Q23 IC control Power supply IC controller Q41 SW Switching regulator control SW Q101 Buffer amp Composite signal buffer

Q151 DSI driver

Q201 Buffer amp Noise buffer amp

When backup voltage become more than 24V output is “L” (momentary power down) / When backup voltage become less than 24V output is “H” When BU voltage supplied output is “L” / When BU voltage not supplied or momentary power down is detected output is “H”

When base voltage level is “L” DSI LED is light up / When base voltage level is “H” DSI LED turns off / When panel assy is pull off, cut off the supply to panel 5V AVR.

7.0V~ Audio P-con, P-ant ON SW2 OUT

2.0~3.0V Illumination, FM ON

4.0V~ Illumination, AM ON

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

COMPONENTS DESCRIPTION

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

Q252 Q350 Pre & NF mute SW When base voltage to “L”, drive to pre & NF mute SW (Q351) Q351 Pre mute SW When base voltage to “H”, muting to the pre Lch or NF Lch line Q352 Pre mute SW When base voltage to “H”, muting to the pre Rch or NF Rch line Q401 DSI illumination SW When base voltage to “H”, DSI illumination is light up.

● CD PLAYER UNIT (X32-5500-00)

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

IC1 RF amplifier adapted for CD-RW of servo error (focusing error and tracking error) signals. Detection of dropout, anti-shock,

IC2

IC3 MP3/WMA decoder IC4 4CH BTL driver IC5 AVR For SW3.3V AVR IC6 AVR For BU3.3V AVR IC7 AVR For BU2.5V AVR IC8 Selector Serial audio signal selector IC IC9 AVR For IC2 (DAC section) 3.3V AVR Q1,3~7 Level shift 3.3V → 5.0V Q8 APC LD power control Q9,10 SW Delay to sub beam line (antecedence beam) D2 Protection diode IC2 protection (for reset line) D3 Protection diode Laser diode protection

For surge measure of audio power IC

CD signal processor built-in MI-COM

When base voltage to “L”, for control to power IC function (STAND BY)

Generation of RF signal based on the signals from the APC circuit and pickup, and generation

track crossing and off-track conditions, included gain control function during CD-RW. Focusing, tracking, sled and spindle servo processing. Automatic adjustment (focusing, tracking, gain, offset and balance) operations. Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data Interpol ration) operations, and Microcomputer function.

Focusing coil, tracking coil, spindle motor and sled motor driver, disc loading and eject operation.

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROPROCESSOR : 784225GC231A (X25 : IC1)

Pin No. Pin Name I/O Description / Processing Operation

1 TUN SMETER I S meter detection input terminal 2 RDS NOISE I FM noise detection input terminal 3 LINE MUTE I Phone Muting signal input terminal (More than 2.5V : NAVI mute, Less than 1.0V : TEL mute) 4AVSS - GND 5L RST O Reset signal output (f or LCD driver) H : Light on display, key scan, L : Light out on display, key reset 6L CE O CE output for LCD driver IC 7AVREF1 - BU5.0V 8L DATAL I DATA input terminal from LCD derive IC 9L DATAS O DATA output terminal to LCD driver IC 10 L CLK O CLK output terminal to LCD driver IC 11 TDF DET I Panel assy detect terminal H : Panel assy come off 12 AUX ON O Select for AUX input signal H : AUX, L : Other 13 RDS QUAL I RDS decoder QUAL signal input terminal 14 RDS DATA I RDS decoder Data signal input terminal 15 PWIC BEEP O Beep audio signal output terminal 16 LX DATA S I DATA signal input from EXT. unit 17 LX DATA M O DATA signal output to EXT. unit 18 LX CLK I/O CLK signal input/output to EXT. unit 19 TUN SCL O I2C CLK signal output terminal (for front-end) 20 TUN SDA I/O I2C DATA signal input/output terminal (for front-end) 21 TUN IFC OUT I IFC signal input terminal H : Station detect, L : No detect 22 RDS AFS O Time constant select terminal (for noise detect) H : Receiving, L : FM seek, AF search 23 CD SDA I/O I2C DATA output terminal (for CD mechanism, electric VR) 24 AUD SDA O CLK output terminal (for CD mechanism, electric VR) 25 NC - NC 26 LX RST O Reset signal output to EXT. unit 27 LX CON O Control signal output to EXT. unit H: ON L: OFF 28 LX MUTE I Request signal input terminal from EXT. unit L : Mute ON 29 LX REQ M O DATA signal output to EXT. unit 30 PWIC SVR O SVR control for Audio power IC 31 PWIC STBY O STBY control for Audio power IC H : Power IC ON 32 PWIC MUTE O Muting control for Audio power IC 33 VSS1 - GND 34 ACC DET I ACC detection input terminal L : ACC detect 35 RESET2 O Reset output terminal L : Active 36 MUTE O Muting signal output terminal 37 BU DET I BU detect input terminal L : BU detect 38 PARK SW I Packing condition detect terminal H : OFF, L : ON (PARKING) 39 PS2 1 O Power supply IC control terminal

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Description / Processing Operation

40 PS2 0 O Power supply IC control terminal 41 PS1 0 O Power supply IC control terminal 42 PS1 1 O Power supply IC control terminal 43 PS1 2 O Power supply IC control terminal 44 PON 5 O SW5V/SW14V control output terminal Hi-Z : OFF, L : ON 45 NC - NC 46 PON CD O MP3 power supply control terminal 47 CD DISC12 SW I 12cm CD disc eject SW detection input terminal L : 12cm disc 48 CD MUTE R I Request for muting signal from CD mechanism L : Mute request 49 NC - NC 50 CE MRST O Reset signal output to CD mechanism L : Active 51 CD DISC8 SW I 8cm CD disc eject SW detection input terminal (Not used) 52 CD LOS SW I Loading start SW detection input terminal L : Loading start 53 CD MUTE L I Request for muting signal from CD mechanism L : Mute request 54 NC - NC 55 CD MSTOP O Request signal (Mechanism is STOP) output to CD mechanism L : Active 56 CD LOE LIM SW I Down SW detection from CD mechanism 57 CD LOEJ I/O CD mechanism loading / eject control terminal H : Eject, L : Loading 58 CD MOTOR O CD mechanism motor loading control terminal H : Loading, Eject, Brake, L : Play 59 DSI O Disc guide illumination control terminal H : DSI ON 60 RESET I Reset input terminal L : Active 61 NC - NC 62 KEY REQ I Request for communication to slave unit L : Key input mode 63 RDS CLK I RDS decoder CLK input terminal 64 LX REQ S I DATA signal input from EXT. unit 65 REMO I Remote control signal input terminal 66 NC - NC 67 VSS0 - GND 68 VDD1 - BU5.0V 69 X2 - Main clock input terminal (10MHz) 70 X1 - Main clock input terminal (10MHz) 71 TEST - GND 72 XT2 - Sub clock input terminal (32.768kHz) 73 XT1 - Sub clock input terminal (32.768kHz) 74 VDD0 - BU5.0V 75 AVDD - BU5.0V 76~78 TYPE0~2 I Destination input terminal DXM6540 (SEL0 : Lo, SEL1 : Lo) 79,80 TUN TYPE0,1 I Electric volume condition setting terminal

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

● CD SIGNAL MICROPROCESSOR : UPD63712GC (X32 : IC2)

Pin No. Pin Name I/O Description / Processing Operation

1 VREFL I Reference voltage input terminal 2AVSS - GND for ADC 3AVCC - Power supply for ADC (BU3.3V) 4NCONC (OPEN) 5 20RST O Reset control output terminal (for decoder) L : RESET, H : NORMAL 6 20ACK I Acknowledge signal input terminal (for decoder) 7 20STBY O Standby control (for decoder) H : STAND BY, L : NORMAL 8,9 NC O NC (OPEN) 10 20INT I Interrupt signal input terminal (for decoder) 11 FOGUP I Interrupt for focus gain up control signal H : Focus gain UP, L : NORMAL 12 LZM I 0 bit muting detect (Lch) L : MUTE OFF, H : MUTE ON 13 RZM I 0 bit muting detect (Rch) L : MUTE OFF, H : MUTE ON 14,15 NC O NC 16 20CS O Chip select signal output terminal (for decoder) 17 20LP O Latch pules signal output terminal (for decoder) 18 20TXD0 I/O Serial data signal output terminal (for decoder) 19 20RXD0 I Serial data signal input terminal (for decoder) 20 20SCLK0 O Serial data clock output terminal (for decoder) 21 DSPTXD1 O Serial data signal output terminal (for DSP) 22 DSPRXD1 I Serial data signal input terminal (for DSP) 23 DSPSCLK1 O Serial data clock output terminal (for DSP) 24 AM0 I Select for ROM mode H : NORMAL, L : External ROM mode 25 DVCC - BU3.3V 26 X2 O Oscillator (16MHz) 27 DVSS - GND 28 X1 I Oscillator (16MHz) 29 AM1 I BU3.3V 30 RESET I Reset terminal L : RESET, H : NORMAL 31,32 NC O NC 33,34 EMU0,1 O NC 35 DSPSTB O Data strobe signal output terminal 36 DSPA0 O Command, parameter select signal H : Parameter, L : Command 37 DSPRST O Reset control output terminal (for DSP) 38 DSPINT I Interrupt signal input terminal (for DSP) H : Interrupt 39 /DAC RESET O Reset signal output terminal (for DSP) L : RESET, H : NORMAL 40 SEARCH O Search condition output terminal H : Search, L : NORMAL 41 LOE/LIM_SW I SLT SW detect input terminal H : Inside 42~45 NC O NC (OPEN) 46 PONE5 O +5V AVR control terminal (for VIDEO) H : Power ON 47 PONE2.5 O +2.5V AVR control terminal (for VIDEO) H : Power ON

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Description / Processing Operation

48,49 NC O NC (OPEN) 50 FLAGIN I C2 error detect terminal L : Correction OK, H : Correction NG 51-60 NC O NC (OPEN) 61 /DAC PD O Reset control output terminal (for DAC) L : RESET, H : NORMAL 62 DVSS - GND 63 NMI I Request for non maskable interrupt signal input terminal 64 DVCC - +VCC 65 DAC MUTE O Muting control output terminal (for DAC) H : MUTE, L : MUTE OFF 66 DAC PON O Audio power supply (for DXM-6550) H : POWER ON 67 PONA5 O +5V Audio power supply (for DXM-6550) H : POWER ON 68 ESRST O Reset signal output terminal (for ES3890) L : RESET, H : NORMAL 69 VMUTE O Video mute control terminal H : MUTE ON, L : MUTE OFF 70 NC O NC (OPEN) 71 SELINT O Video/Audio select output terminal H : NORMAL, L : Interrupt 72 ASEL0 O Audio signal output select control terminal 1 00 : STEREO, 01 : Lch 73 ASEL1 O Audio signal output select control terminal 1 10 : Rch, 11 : Not function 74 NT/PAL O NTSC/PAL select terminal L : NTSC, H : PAL 75 DATASEL O 20F/ES3890 output select H : 20F, L : ES3890 76,77 NC O NC (OPEN) 78 NC (BOOT) I Flash memory writing terminal L : Writing, H : NORMAL 79,80 NC O NC (OPEN) 81 POND3.3 O D3.3V power ON control terminal H : POWER ON 82 MUTEL O Audio muting control terminal (Lch) 83 MUTER O Audio muting control terminal (Rch) 84 SDA I/O I2C data (for system microprocessor) 85 SCL I/O I2C clock (for system microprocessor) 86 MSTOP I Interrupt signal for stand-by mode L : STOP, H : STOP cancellation 87 NC O NC 88 DMUTE O Driver muting control L : MUTE ON, H : MUTE OFF 89 DVCC - +VCC 90 NC O NC (OPEN) 91 DVSS - GND 92,93 NC I NC 94 MSEL I Memory capacity select input terminal H : Capacity Down, L : Capacity UP 95 VCDSEL I NC 96 ASEL I Audio signal output polarity selector H : Reversal output, L : Noninversion output 97 CHSEL I Changer detect input terminal H : Changer, L : Normal 98 SEL0 I Destination input terminal DXM6540 (SEL0 : Lo, SEL1 : Lo) 99 SEL1 I Destination input terminal DXM6540 (SEL0 : Lo, SEL1 : Lo) 100 VREFH I ADC reference power supply (BU3.3V)

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

TEST MODE

1. How to enter test mode

While holding the FM key and PRESET 6 keys, reset the unit. All display segments light up when the test mode is entered.

2. How to exit from test mode

Reset the unit. Turning ACC off, po wer off, momentary power down or panel detaching does not terminate the test mode.

3. Initial status in the test mode

• Sources : ALL OFF (STAND BY)

• Display : All segments were lit.

• Volume : -10dB (displayed as “30”)

• Loudness : OFF

• CRSC : OFF regardless of the presence of switching function.

• Aux : ON

4. TUNER function

• Forced switching of K3I

Each press of the Preset 6 key in Tuner mode should s witch K3I from AUTO→Forced Wide→Forced Middle→Forced Narrow→AUTO. The initial status is A UTO and the display shows these modes as follows.

• AUTO : A

• Forced Wide : M

• Forced Middle : M

• Forced Narrow : N

• RDS check

PCON is power off when RDS data (“RDS test”) received for TUNER mode.

5. CD function

• Test mode specifications of the CD receiver

•Each press of the Track Up k e y jumps to the f ollo wing tr ac k numbers : No. 9→No. 15→No. 10→No. 11→No. 12→No. 13→No. 22 →No. 14→No. 9 (The cycle restarts from here.)

• Each press of the Track Down key jumps to the previous track number to the track being played.

•When the number of total tracks of disc is nine or less, unit playback from a track 1.

• When the media to CD-DA, unit playback from track No. 28 by key operation of preset 1 key.

6. AUDIO function

• Audio-related specifications

•A short press of the Q key initiates the audio adjustment mode.

• Pressing the OPEN/CLOSE key on the remote controller initiates the audio adjustment mode.

• Continuous holding of a remote control key is inhibited.

• Bass, Middle and Treble are adjusted in 3 steps of -8 / 0 / +8 with the Track Up/down keys (default is 0).

• Balance is adjusted in 3 steps of Left L15 / 0 / R15 Max with the Track Up/down keys (default is 0).

• Loudness : OFF

7. MENU function

• Menu-related specifications

•A short press of the PLAY/PAUSE key initiates the Menu mode.

• Pressing the DNPP key on the remote initiates the Menu mode.

• Continuous holding of a remote control key is inhibited.

8. OTHER

• Special display when the display is all on

Pressing the Preset keys while the power is ALL OFF displays the following information.

[PRESET 1] Version display (Month/Day/Hour/Minute) [PRESET 2] ALL segment light up for FL display [PRESET 3] Short press : Display CD operation time.

Long press/hold : Clear CD operation time

[PRESET 5] Short press : Display CD ejection count.

Long press/hold : Clear CD ejection count.

[FM] ROM correction version.

If not mounting ROM correction chip set display shows ROM No___

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