Kenwood KD-CC-471-FM Service Manual

CD AUTO CHANGER

KDC-C47 1FM KDC-C52 1FM

SERVICE MANUAL

When transporting these models, always attach CAUTION CARD and STEPPED SCREW (for transportation).

KDC-C521FM

B53-0152-00 (N) 2703

KDC-C471FM

Holder assy Tray (J99-0614-01)

(J19-5146-02) : KDC-C521FM

(J19-5149-02) : KDC-C471FM

Cord with plug (5m) (E30-4711-05)

COMPACT DISC AUTO CHANGER KDC-C521FM

NEW ANTI VIBRATION MECHANISM

COMPACT

CD-R/RW

DIGITAL AUDIO

COMPACT DISC AUTO CHANGER KDC-C471FM

NEW ANTI VIBRATION MECHANISM

COMPACT

CD-R/RW

DIGITAL AUDIO

Bracket (J19-5018-03) : KDC-C521FM (J19-5020-03) : KDC-C471FM

1BIT 4D/A CONVER

1BIT 4D/A CONVERTER

Bracket (J19-5019-03) : KDC-C521FM (J19-5021-03) : KDC-C471FM

DISC

Screw set (N99-1645-15)

Control unit (Display unit)

Unit holder (J19-7009-08)

Velcro (W01-1633-08)

RF Modulator

Screw (N99-1755-08) x2

Remote controller assy (A70-2051-05) (RC-535) : KDC-C521FM (A70-2052-05) (RC-525) : KDC-C471FM

Size AAA battery (Not supplied)

Except KDC-C471FM (K type)

Antenna adaptor (T90-0512-05)

(E type only) (E type only)

Antenna adaptor (T90-0521-05)

SW5V

LIM SW

L.P.S.

EJ SW

ARM SW

12.5MHz

SPINDLE/LO-EJ

SLED

LOE SW

TR COIL

FO COIL

BTL

EEPROM

&TEXT DECODER

APC

SA5V

S8V

SYSTEM u-COM

IC7

IC1

RF AMP&SARVO DSP

16.93MHz

P-ON

Q10

Q15,16

Q20

BU. DET

IC8

IC5

MG SW

8V AVR

S8V

S-RAM

BU14V

CH RST

AUDIO OUT

5VREG

IC4

DA5V

S8V

HOT

IC9

RESET

7V/9V

Q21,22 M5V1 M5V2

SW5V

&DC MOTOR

DRIVER

ELEVATOR

AVR

SA5V

&D/A CONVERTER &SCF

MUTE

0bit

Q6,7

MUTE

Q4,5,8

SD5V

D B

M5V2

AVR

CH-MUTE

CH-CON

5L I/F

IC11

COMM SW

to HEAD UNIT

ASSY (X13)

(X32)

(X13)

(X92)

PICKUP

KDC-C471FM/C521FM

BLOCK DIAGRAM

(FM MODULATOR)

BLOCK DIAGRAM

KDC-C471FM/C521FM

COMPONENTS DESCRIPTION

● CD PLAYER UNIT (X32-5470-01)

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

RF amplifier built in digital servo and data processor IC. Focusing, tracking, sled and spindle servo processing. Detection of dropout, anti-shock, track crossing and off-track

IC1 Servo IC

IC4 +5V AVR Analogue output circuit power supply for D/A converter.

IC5 Motor driver 1. Input selection.

IC7 Mechanism µ-COM Mechanism and servo control. IC8 EEPROM LPS data back-up memory. IC9 Reset IC When BU 5V voltage is less than 3.0V, IC outputs “Lo”. Q1 APC Laser diode auto power control. Q4 0 bit mute (L CH.) When 0 bit mute is activated, an emitter goes “Hi”, and Q4 outputs “Hi”. Q5 0 bit mute (R CH.) When 0 bit mute is activated, an emitter goes “Hi”, and Q5 outputs “Hi”.

Q6 Mute SW (L CH.)

Q7 Mute SW (R CH.)

Q8 A mute drive

Q9 Servo 5V AVR Q9 is combined with IC5’s pin 26 and 27, and works as a driver of AVR. Q10 P-ON 5V SW While base goes “Lo”, P-ON 5V is supplied to the microprocessor peripheral circuits. Q11 Reset SW When System Reset has activated, a base goes “Hi”, and Q11 is turned on. Q13 CH CON SW While CH CON or CH-CON2 mode is selected, a base goes “Hi”, and Q13 is turned on. Q14 CH MUTE SW When MUTE REQUEST to H/U is outputted, a base goes “Lo”, and Q14 is turned on. Q16 SRV 8V AVR Q16 is combined with Q15 (X92-), and works as a pre-driver of AVR. Q17,18 SRV 8V AVR SW When Q18's base goes “Hi”, Q17 is turned on, and SVR 8V AVR is working.

Q19 7/9V SW

Q20 BU DETECTION SW

conditions. Automatic adjustment (focusing, tracking, gain, offset and balance) operations. Digital signal processing (DSP, PLL, sub-codes, CD-TEXT decode, CIRC error correction, audio data interpolaration) operations.

Focusing coil, tracking coil, spindle motor and sled motor driver. VO1~VO4 and VOL outputs ON/OFF function.

While MUTE1 goes “Hi”, VO1 outputs are turned on. While MUTE2 goes “Hi”, VO2~VO4 and VOL outputs are turned on.

VIN1 amplifier function (input selection and VREF selection)

While VIN SW terminal goes “Lo”, IC pin 15, 16 and 17 inputs are selected. While VIN SW terminal goes “Hi”, IC pin 15, 18 and 19 inputs are selected.

2. VREF selection. While VIN SW terminal goes “Lo”, internal VREF (2.5V typical) is selected. While VIN SW terminal goes “Hi”, external VREF (IC pin 30 input) is selected.

When 0 bit mute or A mute drive is activated, a base goes “Hi”, and L channel audio signal is muted. When 0 bit mute or A mute drive is activated, a base goes “Hi”, and R channel audio signal is muted. When audio mute of IC7 is activated, a base goes “Lo”, and audio mute drive signal is outputted.

When a base goes “Hi”, Q19 is turned on, and SVR 8V AVR is outputting +7V. When a base goes “Lo”, Q19 is turned off, and SVR 8V AVR is outputting +8.5V. While BACKUP is applied, a base goes “Hi”, and Q20 is turned on. When momentary power down has detected, a base goes “Lo”, and Q20 is turned off.

KDC-C471FM/C521FM

COMPONENTS DESCRIPTION

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

Q21,22 BU 5V AVR

Q30 Eccentric disc SW

Q31 VIN SW

● CONTROL UNIT

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

IC701 LCD Driver with Key-matrix IC702 Remote Control Light Sensor Q701 LED ON/OFF SW Q702 Key-matrix Permission SW Q703 Remote Control ON/OFF SW

While BACKUP is applied, AVR outputs +5V. Q21 and Q22 are inverted Darlington connection. When an eccentric disc is detected, Q30 is turned on, and a preceding beam is made to be delayed. While spindle servo or disc loading/eject mode is selected, a base goes “Hi”, and Q31 is turned on.

● FM MODULATOR UNIT

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

IC101,102 GND Isolation AMP IC103 Low Pass Filter IC301 FM Stereo Modulator IC302 1/2 Vcc Driver, ALC Detection Amp IC501 System µcom IC601 6V AVR Q102 L/R Mixer SW D.cont off : L, D.cont on : H Q103,203 ALC Control SW Q301 Composite Buffer Q303,304 Level Control SW LEVEL 1/2 : L, LEVEL 3/4 : H, LEVEL 2/4 : L, LEVEL 1/3 : H Q305 Audio Mute Power on : L, Power off : H Q351 Temperature compensation Q401,402 PLL Low Pass Filter Q411 RF Amp Q501 Changer Reset SW Q502 Reset SW Q601,602 Display Unit Power SW Q603 Backup 5V AVR Q604,605 Power SW Q606 8V AVR Q607 Relay Driver Q608 ACC Detection Q609 Hold Detection

KDC-C471FM/C521FM

MICROCOMPUTER’S TERMINAL DESCRIPTION

● MECHANISM MICROCOMPUTER : 784214AGC-165 (X32 : IC7)

Pin No. Pin Name I/O Description Processing Operation

1 NOR/RW O CD-DA/CD-RW Switching Not used (N.C.) 2 TSTB O CD-TEXT parameter strobe 3 P-CON O P-CON output Not used (N.C.) 4 FOK I Focus OK input “Hi” : Focus OK 5XTALEN O Servo IC oscillation stop control “Hi” : Oscillation stop 6 RST O Servo IC reset terminal “Lo” : Reset 7SAO O Servo IC command/parameter setting terminal 8 SSTB O 9 VDD - Positive power supply connection terminal Connected to D 5V lines 10 X2 - Main clock resonator connection terminal 2 11 X1 I Main clock resonator connection terminal 1 12 VSS - Ground connection terminal Connected to GND lines 13 XT2 - Sub clock resonator connection terminal 2 Not used (N.C.) 14 XT1 I Sub clock resonator connection terminal 1 Not used (connected to GND lines) 15 RESET I System reset input “Lo” : System reset 16 FOGUP I Vibration detect input “Hi” : Vibration detect 17 MGSW I Magazine switch input “Hi” : Magazine in 18 EJSW I Eject switch input “Hi” : Eject switch ON 19 COMMSW I 5-line communication old/new switch input “Hi” : New communication, “Lo” : Old communication 20 PACK I Text data pack synchronous signal input “Hi”→“Lo” : The head of the pack data 21 CH-CON I Changer control input “Hi” : Standby mode, “Lo” : Operation mode

22 BUDET I Momentary power down detection input

23 AVDD 24 AVREF0 I A/D converter reference voltage input Connected to PON 5V lines 25 HOT I Rise in temperature detection input 26 LPS I LPS Mechanical deck position detection input 27 LOESW I Loading complete switch input “Lo” : Loading complete 28 LIMSW I Limit switch input “Lo” : Pickup most inner position 29 TOFF I Tracking OFF mode terminal Not used (pull down to GND lines) 30 ADJSEL I Servo automatic adjustment ON/OFF terminal Not used (pull down to GND lines) 31 TBANK I Tracking gain switching mode terminal Not used (pull down to GND lines) 32 SIM2 I Destination input 2 Not used (pull down to GND lines) 33 AVSS - A/D, D/A converter ground connection terminal Connected to GND lines 34 LPSCO O LPS A/D converter reference power control output Not used (N.C.) 35 AMUTE O Audio mute output “Lo” : Audio mute ON 36 AVREF1 I D/A converter reference voltage input Connected to D 5V lines 37 SDI I Servo IC communication serial data input 38 SDO O Servo IC communication serial data output 39 SCK O Servo IC communication serial clock output

Servo IC command/parameter setting strobe terminal

A/D converter positive power supply connection terminal

“Hi” : Parameter setting, “Lo” : Address resister setting “Hi”→“Lo” : Serial data latch

“Hi” : When momentary power down detected or BU OFF “Lo” : BU ON Connected to D 5V lines

KDC-C471FM/C521FM

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Description Processing Operation

40 DATAH I Data input from H/U 41 DATAC O Data output from the changer 42 HCLK I/O Communication clock input/output with H/U 43 RECQC O Communication request to H/U “Lo” : Communication requested 44 CHMUTE O Audio mute request to H/U “Lo” : Audio mute requested 45 TSI I Text data input from servo IC 46 TSO O Text data output to servo IC 47 TSCK O Text data clock to servo IC 48~55 A0~A7 O Address setting terminal for S RAM 56~63 D0~D7 I/O Data input/output terminal with S RAM 64~68 A8~A12 O Address setting terminal for S RAM 69~71 A13~A15 O Chip enable setting terminal for S RAM Not used (pull down to GND lines) 72 VSS - Ground connection terminal Connected to GND lines 73 A16 O Chip enable setting terminal for S RAM Not used (pull down to GND lines) 74 A17 O Chip enable setting terminal for S RAM 75 RAMOK O Pickup check judging terminal for production Not used (N.C.) 76 ELVADJ I Mechanism deck ascent/descent position terminal Not used (pull up to D 5V lines) 77 RD O Read-out to S RAM control output 78 WR O Write to S RAM control output 79 WAIT I Waiting time insertion input when accessing S RAM Not used (pull down to GND lines) 80 ASTB O Chip selection to S RAM Not used (N.C.) 81 VDD - Positive power supply connection terminal Connected to D 5V lines 82 PUSEL I Pickup type select terminal Pull up to D 5V lines 83 REQH I Communication request from H/U “Lo” : Communication requested 84 SPLO+ O Spindle/Loading control terminal 85 SPLO- O Spindle/Loading control terminal 86 ELV+ O Mechanism deck ascent/descent terminal 87 ELV- O Mechanism deck ascent/descent terminal 88 SIM1 I Destination input 1 89 SEARCH O Search mode output Not used (N.C.) 90 TEST1 I Test mode terminal 1 for test mode Not used (pull down to GND lines) 91 TEST2 I Test mode terminal 2 for test mode Not used (pull down to GND lines) 92 8/7V O Motor driver IC power voltage control output “Hi” : 7V, “Lo” : 8.5V 93 EEPWR I EEPROM write mode terminal for production Not used (pull down to GND lines) 94 TEST/VPP I Flash ROM program mode terminal Not used (connected to GND lines) 95 SRVSEL I 96 SLNSA I Sled non-sensitive area ON/OFF terminal Not used (pull down to GND lines) 97 SDA I/O Data input/output with EEPROM 98 SCL O Clock output to EEPROM 99 PON O PON output “Lo” : AVR & LPS POWER ON 100 ARMSW I Arm switch input “Hi” : Arm switch ON

Servo active mode terminal (no mechanism movement)

“Lo” : adapted for CD-TEXT, “Hi” : not adapted for CD-TEXT

Not used (pull down to GND lines)

KDC-C471FM/C521FM

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER : LC72366-9B63 (FM MODULATOR UNIT : IC501)

Pin No. Pin Name I/O Terminal name Description

1 XIN I X IN X_tal 2 TEST2 - GND Ground connection terminal 3~5 PG3~1 O NC Not used (pull down to GND lines.) L 6 PG0 I GND Connected to GND lines. 7 PF3 O NC Not used (open) L 8 PF2 I REQC CD-Changer REQC (Active “Low”) 9 PF1 O REQH CD-Changer REQH (Active “Low”) H 10 PF0 O CHCON CD-Changer ON L 11 SI2 I CH_DATA_C CD-Changer DATA in 12 SO2 O CH_DATA_H CD-Changer DATA out L 13 SCK2 O CH_CLK CD-Changer DATA SCK (Active “Low”) H 14 PE0 O NC Not used (open) L 15 PD3 O LCD DATA out LCD Driver DATA out L 16 PD2 O LCD CLK LCD Driver CLK out L 17 PD1 O LCD RESET LCD Driver RESET out L 18 PD0 O LCD CE LCD Driver CE out L 19~26 PC3~PB0 O NC Not used (open) L 27 PA3 I LCD DATA in LCD Driver DATA in 28~30 PA2~0 I NC Not used (pull down to GND lines.) 31 VDD - Vdd 5V 32 PQ0 O NC Not used (open) L 33~44 PP3~PN0 O GAIN12~1 Modulation output switching L 45 PM3 O SEP-ATT When it has GAIN5 output, “Hi” output L 46~52 PM2~PL0 O NC Not used (open) L 53 PK3 O RELAY Antenna relay control output terminal L 54 PK2 O P-on P_ON L 55 PK1 O MUTE Mute output terminal for the Tuner frequency change L 56 INT0 I REMOCON Remote controller signal input 57~60 PJ3~0 O NC Not used (open) L 61~66 PI1~PH0 I NC Not used (pull down to GND lines.) 67 HOLD I HOLD ACC detection (Operation in HOLD “Low”) L 68 SNS I Vdd Vdd 69 LCTR I NC Not used (pull down to GND lines.) 70 HCTR I NC Not used (pull down to GND lines.) 71 EO3 O NC Not used (open) Hi-Z 72 SUBPD O NC Not used (open) Hi-Z 73 VDD - Vdd Vdd 74 AMIN I NC Not used (pull down to GND lines.) 75 FMIN I VCO in VCO input 76 VSS - Vss Vss 77 EO2 O NC Not used (open) Hi-Z 78 EO1 O Error out Phase Detector Error output Hi-Z 79 TEST1 - NC Not used (pull down to GND lines.) 80 XOUT O X-out X-tal

Operation in HOLD

ADJUSTMENT

● L.P.S. initial position adjustment procedure

1. Connect the changer to the HEAD UNIT (H/U).

2. While holding the magazine eject button of the changer, press the reset button of the H/U.

3. After about 3 seconds, release the magazine eject button.

4. Press the SRC button of the H/U to enter the CD-CH mode, and the H/U's display section indicates “E-88”.

5. Move the mechanism deck to around the 1st stage by pressing the DISC- or DISC+ button.

6. Insert the adjustment tool (W05-0635-00) into the tool hole on the changer mechanism.

7. Then press the DISC+ button to move the mechanism deck until the mechanism's slider hits the adjustment tool.

8. When the motor locks (stops), press the REPEAT key of the H/U. When the REPEAT key is pressed, the mechanism moves automatically to the 1st stage and the initial position adjustment completes. (The data is written in the EEPROM at this time.)

KDC-C471FM/C521FM

W05-0635-00

● Caution : Note on IC8 (EEPROM)

Be sure to use the W05-0869-00 when replacing the EEPROM. IC8 stores the digital ser vo data of the pickup servo. Therefore, if the EEPROM does not store servo data, ERROR76 (E-76) will indicate the H/U’ s display section at the moment CD is played.

Instrument : SSG, OSC (5MHz), AC VOLTMETER, PWR SUPPLY, H/UNIT, CD-CH

RECEIVER

No. ITEM INPUT SETTINGS OUTPUT SETTINGS (MODULATOR)

FREQ

L/R Balance CD-CH cignal off

(Scope Setting Condition for L/R BAL. Adj.)

1. VOLTAGE RANGE : 5mV

2. TIME/DIV : 50µs

Adj. (Tr No.29 or Pause)

Moduration

level Adj.

1. Ref.FM 1kHz 80dBµV Connect a Stereo, CD-CH Tr No.1 AC voltmeter 88.3MHz VR302

2. D.Cont Off MOD Lv:2 to Receiver PreOut

Connect a

Oscilloscope 88.3MHz VR301 Min Level (a)

to Q301 Base.

Adjusted to be min level point

ALIGNMENT

POINTS

* After Adj. The glue is applied to VR301, VR302.

ALIGN FOR FIG.

Difference between

FM and a CD-CH

level is adjusted to

(-0.5±1.0dB).

(Before Adj.) (After Adj.)

Fig. (a)

A B C D E

KDC-C471FM/C521FM

PC BOARD (COMPONENT SIDE VIEW)

CD PLAYER UNIT X32-5470-01 (J74-1527-01)

F+

T+

T-

F-

SP-

SP+

SL-

SGND

REQH

R102

GND

TBANK

IC7

SRVSEL

TEST1

SL+

CP3

LPS

TOFF

SCL

FVPP W5

SLNSA

ELV-

EEPRW

ELV+

D15

PCON

AMUTE

FDTI

ADJSEL

C70

PON

SDA

HOT

NOR/RW

/TSTB

FCLK

FDTO

D22

R99

CHRST

PACK

D21

/CHCON

FRESET

FVDD

CN2

LCH

CHMUTE

CHCON

C52

C69

C68

IC4

R97

M5V1

RCH

OGI

R106

Q11

21 34

C72

CHRST

DA5V

R96

IC9

BU14

DAGND

R206

M5V2

Rch Lch

R54

IC6

LIMSW

R53

R145

C22

4 1

MGND

23 LOESW

R73

STB

SD5V

R72

R69

IC5

D24

821

R123

R105

CP6

CP12

SPLOD-

RAMOK

R122

3619

R162

TSCK

TSI

TSO

CP10

50 26

CP11

CP5

76 100 WR

R134

ELV+

SIM1

ELV-

C71

AVREF

TEST2

R68

R70

R67

D23

COMMSW

R139

/CE1

Q31

IC11

128722

/OE

SPLOD+

Q20

BUDET

R76

EJSW

R126

R127

PUSEL

ELVADJ

R133

C61

R77

D12

D11

Q18

Q17

R78 R79

C63

BU14

Q16

SRV8

D10

Q22

D16

C17

Q21

CN1

VREF

RST

FOK

SCK

C15

C16

ARMSW

F E

HOLD

R146

IOP-

VCC

IOP+

R7 100

IC1

TBC LZM

PLCK

LOCK

R59

3TE

RZM TZC

TEVCA

FZC

MIRR

R11 R12 R13 R14

C9 76

FBAL

RFCK

R152

C11

DACO

A3T

R87

C10

TSTB

PACK

R16

TSI

TBAL

R84

C19

SA5V

ARF

TSCK TSO

MGSW

SAGND

ASY EFM

MD SD TD

X32-5470-01

Ref. No. Address

IC1 3D IC4 3C IC5 2B IC7 4B IC9 4C

Q6 3C Q7 3C Q8 3C

Ref. No. Address

Q11 4C Q16 5D Q17 5C Q18 5C Q20 4A Q21 5D Q22 5D Q31 3A

Refer to the schematic diagram for the values of resistors and capacitors.

JIHGF

KDC-C471FM/C521FM

PC BOARD (FOIL SIDE VIEW)

CD PLAYER UNIT X32-5470-01 (J74-1527-01)

R60

C48

C49

R58

R57

C46

C47

R85

R120

C23

Q30

C205

C13 R19 R18

C12

C204

C200

CP16

R15

R20

C206

C202

C201

R10

C75

C14

C203

R82

R205

C24 R93

R61

C300 C301

CP9

R144

Q13

C34

R95

C85

R100

Q10

R81

R80

R121

Q14

R147

R83

IC8

R129

R75

R154

R98

R101

R107 R108

R148

R74

R153

TH1

R149

R150

R125

R155

C67

CP17

CP1

L.P.S

R156

CP15

C73 R143 R141

R157

R17

R111

R110

CP8

R135

R142

R190

R138

R137

R136

CP7

R161

R140

CP14

C55

R22

C56

R26

R21

R25

R71

C192

C21

R191

R114

R86

X32-5470-01

Ref. No. Address

IC8 4H

Q1 2G Q4 3H Q5 3H Q9 2J

C60

R124

Ref. No. Address

Q10 4H Q13 3H Q14 3H Q19 5H Q30 2F

C59

C62

C64

D14

Q15

Q19

Refer to the schematic diagram for the values of resistors and capacitors.

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