Kenwood KDC-2031-SA, KDC-2031-SAY, KDC-2031-SG, KDC-2031-SGY Service manual

CD RECEIVER

KDC-203 1SA/SAY KDC-203 1SG/SGY

SERVICE MANUAL

SPARE TDF PANEL

MAIN UNIT NAME TDF PARTS No. TDF NAME KDC-2031SA/SAY KDC-2031SG/SGY

PANEL ASSY KDC-2031SA/SAY/SG/SGY (A64-3461-02)

Y33-2140-66 TDF-2031SA Y33-2140-67 TDF-2031SG

LEVER (D10-4589-04) x2

ANTENNA ADAPTOR (T90-0523-05)

VOL

AUD

SET UP

MONO

DC CORD (E30-6413-05)

ESCUTCHEON (B07-3122-01)

AUTO

SCAN RDM REP

PLASTIC CABINET ASSY (A02-2736-03)

AME

MOUNTING HARDWARE ASSY (J21-9716-03)

This product uses Lead Free solder.

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

BLOCK DIAGRAM

ANT

CD or MD

MECHA

AUDIO OUT

CHANGER

AUDIO OUT

BACK-UP

SWITCH UNIT (X16-)

ED1

S11

VOL

AM+B

AM AGC

VFD

Q501

SERVO A8V BU5V

.......

L506

FM AGC

800mV

1200mV

RDS

DECODER

IC1

VFD DRIVER KEY MATRIX

ELECTRIC UNIT (X34-)

IC10

MPX OUT

MPX IN

E-VOL

TUNER

IC11

E2PROM

IC7

PAN5V BU5V

REMOTE

with

KEY

ILLUMI

IC8

RST IC

SYSTEM u-COM

IC3

.......

BU5V

IC1

A8V

Q155

DSI

Q351,352

PRE MUTE

IC6

MUTE LOGIC

PAN5

SERVO

Q151

PAN5V

Q72,73

Q51

SURGE DET

Q52

BU DET

Q53

ACC DET

SERVO

VFD REG

IC4

IC15

POWER IC

SW5V AM+B

A8V

BU5V

FM (J/K Type) FM (E Type) AM (J/K Type) AM (E Type) CD/MD RECEIVER

IC3

POWER SUPPLY IC

P-CON P-ANT SW5V AM+B AUDIO+B VCC

BU5V ILLUMI

PRE OUT

:1800mV :

1372mV

600mV

855mV

3600mV

:CHANGER

3600mV

SP OUT

BACK-UP

ACC

TEL MUTE P-ANT P-CON

MECHA ASSY (X92-)

PICK-UP (DPU1)

TR COIL FO COIL

DM1

SPINDLE MOTOR

DM2

LOADING & SLED

MOTOR

APC

D. GND

IC3

MOTOR DRIVER

SLED

H L

VREF

Q5,6,D3

CURR.

AMP

S. GND

CD PLAYER UNIT (X32-5750-00)

CLOCK

16.934MHz

IC2

SERVO

PROCESSOR

u-COM

DRV MUTEMUTE

VREF

D. GND

IC1

RF AMP

VREF

A+5V

REF

A. GND

D. GND

SW +5V

D. GND

5V REG

IC4

5V SW

LPF

8V SW

MOTHER BOARD (X34-)

DOUT

CLK

DATA

MSTOP

MRST

MUTE L

MUTE R

L-ch R-ch

A8V A. GND

BU5V

D. GND

LOE/LIM SW

12EJE SW

LOS SW S7.5V

S. GND MOTOR LO/EJ

22 19

18 10 11

12 13

8 6

9 7

3 2 4 5

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

COMPONENTS DESCRIPTION

● ELECTRIC UNIT (X34-3412-7x)

Ref. No. Application / Function Operation / Condition

IC1 SYSTEM µ-COM System control. IC3 POWER SUPPLY DC5Vx2, 7.9Vx1, 8.1Vx1, 10.3V, P.CON, P-ANT output. IC4 POWER IC Audio signal amplifier. IC6 MUTE LOGIC Mute control. IC7 RDS DECODER For other models. IC8 RESET “L” when detection voltage goes below 3.6V. IC10 E-VOL & TUNER E-VOL, Tuner, Stereo decode. IC11 E2PROM Saves and writes tuner adjustment data. IC15 VFD REGULATOR 11.3V output voltage for LED and VFD. Q51 SERGE DET “ON” when the base goes “H”. Q52 BU DET “ON” when the base goes “H”. Q53 ACC DET “ON” when the base goes “H”. Q71 SERVO+B CONTROL SW “ON” when the base goes “H”. Q72,73 SERVO+B AVR Output voltage level : 7.5V. Q74 IC3 CONTROL SW “ON” when the base goes “H” (Output voltage : 10.3V). Q151 PANEL 5V SW “ON” when the base goes “L”. Q155 DSI ILLUMI SW “ON” when the base goes “L”. Q252 IC4 STBY SW “ON” when the base goes “L”. Q330 Q351, 352 MUTE DRIVER “ON” when the base goes “L”. Q351 Lch PRE MUTE SW Pre-output is muted when the base goes “H”. Q352 Rch PRE MUTE SW Pre-output is muted when the base goes “H”. Q501 AM RF AMP Adjusts for AM-RF gain.

● CD PLAYER UNIT (X32-5750-00)

Ref. No. Application / Function Operation / Condition

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

IC1

IC2

IC3 4ch BTL DRIVER

IC4 L.P.F. (LOW PASS FILTER) 2nd low pass filter for audio signals. Q1 Q2 DIGITAL +5V SW “ON” When P. ON signal goes “L”.

RF AMPLIFIER responding generation of servo error (focusing error and tracking error) signals. to CD-RW Detection of dropout, anti-shock, track crossing and off-tracking conditions, included

gain control function during CD-RW.

Focusing, tracking, sled and spindle servo processing. CD SIGNAL PROCESSOR Automatic adjustment (focusing, tracking, gain, offset and balance) operations. built-in µ-COM Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data

interpolation processing) operations, and microcomputer function.

Focusing coil, tracking coil, spindle motor and sled motor driver, disc loading and

eject operation.

APC (AUTOMATIC POWER CONTROL)

LD power control.

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

COMPONENTS DESCRIPTION

Ref. No. Application / Function Operation / Condition

Q3 Q4 SW “ON” When P. ON signal goes “L” (SW+5V is ON). Q4 ANALOG +8V SW “ON” When P. ON signal goes “L” (Q3 is ON). Q5, 6 CURRENT AMP Current driver.

● SWITCH UNIT (X16-294x-xx)

Ref. No. Application / Function Operation / Condition

IC1 VFD DRIVER IC3 REMOTE SENSOR Q1 GREEN LED SW “ON” when the base goes “H”. Q2 RED LED SW “ON” when the base goes “H”. Q21 PAN SW5V “ON” when the base goes “H”.

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM µ-COM : IC1 on X34- (ELECTRIC UNIT)

Pin No.

1 DC ERR I DC offset detection input 2 LINE MUTE I Phone detection NAVI MUTE : Over 2.5V, TEL MUTE : Below 1V 3ROTARY CW I Rotary encoder input 4AVSS 5 TUN TYPE1 I E-VOL setting switch Refer to “TUN TYPE” on the TRUTH TABLE 6 TUN TYPE2 I E-VOL setting switch Refer to “TUN TYPE” on the TRUTH TABLE 7AVREF1 8 VFD DATAF I Data input from VFD driver 9 VFD DATAS O Data output to VFD driver 10 VFD CLK O Clock output to VFD driver

11 L VFD RST O Reset output to VFD driver

12 VFD CE O Chip enable output to VFD driver 13 ROTARY CCW I Rotary encoder input 14 L TDF DET I TDF panel detection TDF panel OFF : H, TDF panel ON : L 15 PWIC BEEP O Beep output 16~19 NC -

20 L TUN ADJ I For adjusting IC10

21 TUN SD I Tuner search stop output H : Station exists, L : Station does not exist

Active

Pin Name I/O Application Processing Operation

(H/L)

Display OFF, Key reset, TDF panel OFF : L Display ON, Key scan : H

Adjustment=H, PS1-1,2=L, PS1-3=Hi-Z, PS2-1,2=Hi-Z, TUN DATA, CLK=Hi-Z

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.

22~24 NC 25 AUD SDA I/O Volume + tuner I2C data input and output 26 AUD SCL I/O Volume + tuner I2C clock input and output 27 H PWIC STBY O Power IC standby output Power IC ON : H, Power IC OFF : L 28 H VOL MUTE O E-VOL mute output L : Mute OFF, Hi-Z : Mute ON 29 L PWIC MUTE O Power IC mute output Power OFF : L, Standby : L, Tel mute : L 30 TUN FANC OUT O Tuner block (inside the µ-com) check OK : L, NG : H 31 RESET2 O Mute for reset Output L 32 NC 33 VSS1 34 NC 35 L ACC DET I ACC detection ACC exists : L, ACC does not exist : H

36 L BU DET I Momentary power-down detection

37 NC 38 PS2-2 O Power supply control output 39 PS2-1 O Power supply control output 40 PS1-1 O Power supply control output 41 PS1-2 O Power supply control output 42 PS1-3 O Power supply control output 43,44 NC 45 CD MUTE I CD mute request L : Mute request 46 L CD MSTOP O CD mecha u-com stop 47 CD LOE LIM SW I CD detection (chucking switch) H : Loading is finished, L : Disc does not exist

48 CD LOEJ I/O CD motor control

49 CD MOTOR O CD motor control

50 NC 51 L CD MRST O CD mecha µ-com reset H : Normal condition, L : Reset 52 CD SCL I/O CD mecha I2C clock output 53 CD DISC12 SW I 12cm CD detection 54 CD LOS SW I CD loading detection 55 CD SDA I/O CD mecha I2C data input and output 56 OEM DISP CE I/O External display chip enable External display 57 OEM DISP CLK I/O External display clock External display 58 OEM DISP DATA I/O External display chip data External display 59 DSI O DSI control DSI ON : H, DSI OFF : L, TDF DET=H (DSI blinks) 60 L RESET I

Active

(H/L)

Pin Name I/O Application Processing Operation

BU exists : L BU does not exist (Momentary power-down) : H

Refer to “POWER IC CONTROL” on the TRUTH TABLE Refer to “POWER IC CONTROL” on the TRUTH TABLE Refer to “POWER IC CONTROL” on the TRUTH TABLE Refer to “POWER IC CONTROL” on the TRUTH TABLE Refer to “POWER IC CONTROL” on the TRUTH TABLE

H : mecha µ-com operates, L : mecha µ-com is stopped

Refer to “CD MECHA CONTROL OPERATION” on the TRUTH TABLE Refer to “CD MECHA CONTROL OPERATION” on the TRUTH TABLE

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.

61 NC -

62 L PON FL O VFD power supply ON

63 KEY REQ I Communication request from VFD driver L : Key input 64 NC 65 REMOTE I Remote control input 66 NC 67 VSS0 68 VDD1 69 X2 70 X1 71 TEST 72 XT2 73 XT1 74 VDD0 75 AVDD 76~78 TYPE 3~TYPE 1 I Destination switch 79 NC 80 TUN SMETER I Tuner S-meter input

Active

(H/L)

Pin Name I/O Application Processing Operation

VFD ON : H, VFD OFF : L TDF DET H (DSI blinks) : L, TDF DET L : H

● TRUTH T ABLE

• TUN TYPE

General models commercially-designated as pure KENWOOD brand (Initial value) Initial value setting

• POWER SUPPLY IC (IC3) CONTROL

SEL1 (Pin No. 11)

PS1-2 PS1-3 PS2-1 ILLUMI P-CON P-ANT

LLLOFF OFF OFF

LLHONOFF OFF HLHONONOFF HHHONONON

SEL2 (Pin No. 12)

PS1-1 PS2-2 AUDIO SW5 AM

LLOFF OFF OFF HLONON OFF HHONON ON

TYPE 1 TYPE 2

• CD MECHA CONTROL OPERATION

CD LOEJ CD MOTOR CD MECHA OPERATION

LH Load

HH Eject Hi-Z L Stop Hi-Z H Brake

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

● CD MECHANISM µ-COM : IC2 on X32- (CD PLAYER UNIT)

Pin No.

1 TVD O Traverse drive output (PWM output). 2 SPL O Spindle motor drive output (PWM output). 3NC-No connection. 4 PWM O Multipurpose PWM output. 5 TBAL O Tracking balance adjustment output (PWM output). 6 FBAL O Focusing balance adjustment output (PWM output). 7 NRFDET I RF detection signal input. L : Detection 8 OFT I Off-tracking signal input. H : Detection 9 BDO I Drop-out signal input. H : Detection 10 LDON O Laser-on signal output. H : Focus ON 11 DSLB O DSL balance output. 12 DVDD1 - Power supply for digital circuit. 13 DVSS1 - GND for digital circuit. 14 AVSS2 - GND for analog circuit. For DSL, PLL and A/D converter 15 DSLF I/O Loup filter for DSL and bias output for ARF. 16 ARF I RF signal input. 17 RFSW I DSL circuit time constant switch. 18 PLLF I/O Loup filter for PLL. 19 PLLF2 I/O Loup filter character switch for PLL. 20 IREF I Reference current input. 21 RFENV I RF envelope signal input. 22 TRCRS I Tracking cross signal input. 23 TE I Tracking error signal input. 24 FE I Focusing error signal input. 25 AVDD2 - Power supply for analog circuit. For DSL, PLL and A/D converter 26 AVSS1 - GND for analog circuit. For Lch/Rch audio output 27 OUTR O Rch audio output. 28 AVDD1 - Power supply for analog circuit. For Lch/Rch audio output 29 OUTL O Lch audio output. 30 DVSS3 - GND for digital circuit. 31 CSEL 32 NC - No connection. 33 ASEL 34 MSEL0 35 MSEL1 36~39 NC - No connection. 40 VREFP - Reference power supply input for A/D converter. 41 HOT -

Active

(H/L)

Pin Name I/O Application Processing Operation

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.

42 8EJE SW 43

44 LOE/LIM SW I

45~49 NC - No connection. 50 DVDD2 - Power supply for digital circuit. 51 X1 I Main clock input. 52 X2 O Main clock output. 53 DVSS2 - GND for digital circuit. 54 XSUB1 55 NC - No connection. 56 TEST1 - Test terminal. Normal condition : “H” fixed 57 TEST2 - Test terminal. Normal condition : “H” fixed 58,59 NC - No connection. 60 DRV MUTE O Driver mute control. L : Mute ON, H : Mute OFF 61 L MUTE L O Audio Lch mute output. 62 L MUTE R O Audio Rch mute output. 63 L RST I LSI reset input. 64 OCD CLK 65 L MSTOP I Standby detection. 66 DATA I/O 67 SBIO I Data input. During serial writer is connected. 68 L CLK I/O 69 TX O Digital audio interface signal output. 70 NC - No connection. 71 XSEL 72 MCNT I Loading control / Eject control. L : OFF (Host control), H : Mecha µ-com control 73 P. ON O Audio & Servo power supply control. L : Power supply ON. H : Power supply OFF 74,75 NC - No connection. 76 CD-RW O CD-RW control. H : CD-RW, L : Normal disc 77 NC - No connection. 78 DVDD3 - Power supply for digital circuit. 79 FOD O Focusing drive output (PWM output). 80 TRD O Tracking drive output (PWM output).

Active

(H/L)

Pin Name I/O Application Processing Operation

12EJE/SDET SW

Loading-end detection / H : Loading-end detection Pick-up inner circumference detection. L : Pick-up inner circumference detection

I2C bus data line (Communication line to system µ-com).

I2C bus clock line (Communication line to system µ-com).

During serial writer is connected.

TEST MODE

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

How to enter the test mode

While simultaneously press PRESET “1” k ey and PRESET “3” key, press “RESET” button.

How to release the test mode

Press “RESET” button. (The release cannot be achieved in the conditions of POWER OFF and ACC OFF.)

Initial conditions of the test mode

• The source is “STANDBY”.

• The displays all lit up.

• The volume is at –10dB (The display shows “30”.)

• LOUD is “OFF”.

• SYSTEM Q is “NATURAL”.

• BEEP is sounded at all time with the key depressed f or less than 1 second.

Special displays when all indicator lights are lighted

When “PRESET” keys are pressed while all indicators for the STANDBY sources are lighted, the following displays will appear.

PRESET

“1” key (4digits : hour, minute)

PRESET

“2” key (Display) : XXXX xxxx

PRESET

“3” key time display (STANDBY source time is not counted.)

PRESET

“4” key time display

•Version display (4 digits : month, date)

(Display) : XXXX xxxx

• Serial number display (4 digits) (4 digits)

•When pressed for less than 1 second : POWER ON

(Display) : _ _ _ X xxxx MAX 60,000 (hours)

* The display is cleared by pressing the key for more

than 2 seconds.

• When pressed for less than 1 second : CD operation

(Display) : _ _ _ X xxxx MAX 60,000 (hours)

* The display is cleared by pressing the key for more

than 2 seconds.

PRESET

“5” key number display

PRESET

“6” key close number display

•When pressed for less than 1 second : CD EJECT

(Display) : _ _ _ X xxxx MAX 60,000 (times)

* The display is cleared by pressing the key for more

than 2 seconds.

• When pressed for less than 1 second : Panel open/

(Display) : _ _ _ X xxxx MAX 600,000 (times)

* The display is cleared by pressing the key for more

than 2 seconds.

“FM” • ROM CORRECTION version display

key (Display)

Effective : Rxxx (x : number) Not effective (When not able to read) : R – – – Not effective (When version is different) : R✳✳✳

“AM” • IC10 adjustment status (Refer to “ADJUSTMENT” on

key the following page.)

(Display)

Adjustment complete : E2OK Adjustment not completed : E2ER Communication error : ICER

* When other than “E2P _ OK _ _” , Pin No. 30 will

become “H”.

“ ”•Mechanism error detection status

key • Communication error → Error No. 1 → Error No. 2 →

Error No. 3 → Communication error (Error No. 1 is the most recent error.) (Display)

Communication OK : ICOK Communication error : ICER Not detected : En – – (n : 1~3) Detected : En✳✳ (✳✳ : error code)

* The display is cleared by pressing the key for more

than 2 seconds.

KDC-2031SA/2031SAY KDC-2031SG/2031SGY

SPECIAL MODE

● DC offset error detection confirmation mode

Confirmation mode :

While depressing PRESET “3” key and PRESET “6” key simultaneously, press on the “RESET” button. (Display) Detected : DCER

Not detected : DCOK

* By pressing “CLK” key while “DCER” is being displayed,

detection status is cleared. This will result in the display of “DCOK”.

Release Method : Press “RESET” button.

● Mechanism memory clear confirmation mode

Confirmation mode :

While depressing “ATT” key and “Q” key simultaneously, press “RESET” button. (Display) : MCLR

*Two seconds after the confirmation mode boots up, Mecha-

nism memory clear as a result is displayed. (Display) Clear status display normal completion : CD _ O

Clear status display abnormal completion : CD _ –

Release Method : Press “RESET” button.

ADJUSTMENT

After replacing the following parts, adjust as follows.

REPLACED PARTS ADJUSTMENT ITEMS

Ref. No.

● 1st AM MIX / 2nd AM MIX ADJUSTMENT

ADJUSTMENT POINT : L508 (1st AM MIX) / L509 (2nd AM MIX) VOLTAGE VALUE CHECK POINT : S-METER check land (X34-) Adjust so that S-METER voltage value becomes maximum.

Function / Parts name

IC10 E-VOL & TUNER YES YES YES IC11 E2PROM YES YES YES L507 VCO COIL YES YES YES L508 1st AM MIX IFT YES - L509 2nd AM MIX IFT - YES L518 FM ANTENNA COIL - - YES

D504 VARIABLE YES YES YES

CAPACITANCE DIODE

D506 VARIABLE YES YES YES

CAPACITANCE DIODE

X501

CRYSTAL RESONATOR

1st AM MIX 2nd AM MIX FM antenna

YES YES YES

• SG setting

DESTINATION

Europe 999kHz OFF 35dBµV (EMF) Except Europe 1000kHz OFF 35dBµV (EMF)

FREQUENCY MODULATION ANTENNA INPUT

● FM ANTENNA ADJUSTMENT

ADJUSTMENT POINT : L518 VOLTAGE VALUE CHECK POINT : S-METER check land (X34-) Adjust so that S-METER voltage value becomes maximum.

• SG setting

DESTINATION

Europe 87.5MHz OFF

Except Europe 87.9MHz OFF

FREQUENCY MODULATION ANTENNA INPUT

5dBµV (LOAD) or

11dBµV (EMF)

5dBµV (LOAD) or

11dBµV (EMF)

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