Kenwood KDC-3028, KDC-328 Service Manual

CD RECEIVER

KDC-3028 KDC-328

SERVICE MANUAL

SPARE TDF PANEL

MAIN UNIT NAME TDF PARTS No. TDF NAME KDC-3028 Y33-2150-68 TDF-53DB KDC-328 Y33-2150-67 TDF-53D

PANEL ASSY KDC-3028 (A64-3630-12)

ATT

VOLVOL AUDAUD

SETSETUPUP

MENUMENU

FFFF

MOUNTING HARDWARE ASSY (J22-0011-03)

DC CORD (E30-6415-15)

KDC-

3028

C.S.

DISPDISP

SCAN RDM REP M.RDM

PLASTIC CABINET ASSY (A02-2743-03)

* ESCUTCHEON (B07-xxxx-xx)

PANEL ASSY KDC-328 (A64-3486-12)

SCRL

AUTO

AME

ATT

VOLVOL

AUDAUD

SETSETUPUP

MENUMENU

FFFF

SCAN RDM REP M.RDM

KDC-

SCRL

AUTO

328

C.S.

DISPDISP

AME

REMOTE CONTROLLER ASSY (RC-517) (A70-2069-05)

BATTERY (Not supplied)

LEVER (D10-4589-04) x2

SCREW SET (N99-1757-05)

SCREW SET (N99-1763-05)

* Depends on the model. Refer to the parts list.

MOUNTING HARDWARE (L) (J22-0258-04)

MOUNTING HARDWARE (R) (J22-0259-04)

This product uses Lead Free solder.

KDC-3028/328

BLOCK DIAGRAM

ANT

Q501

CD or MD

MECHA

AUDIO OUT

CHANGER

AUDIO OUT

BACK

SWITCH UNIT (X16-)

ED1

VFD

VOL

AM+B

AM AGC

SERVO A8V BU5V

CD5V

EJECT KEY

.......

L506

FM AGC

RDS DECODER

BU5V

Q156S152

EJECT ILLUMI

800mV

1200mV

PAN5V

IC1

VFD DRIVER

with

KEY MATRIX

IC10

IC11

E2PROM

MPX OUT MPX IN

IC1IC7

ELECTRIC UNIT (X34-)

E-VOL

TUNER

IC8

RST IC

u-COM

IC2

REMOTE

.......

KEY

ILLUMI

A8V

BU5V

S151

PANEL DET

Q351,352

PRE MUTE

IC6

MUTE LOGIC

OEM

PAN5

SERVO

Q51

Q52

Q53

Q151

PAN5V

Q152

ILLUMI SW

SURGE DET

BU DET

ACC DET

Q72,73

SERVO

IC15

VFD REG

IC4

POWER IC

AM+B

A8V

BU5V

:1800mV

FM (J/K)

1372mV

FM (E) AM (J/K)

AM (E)::

IC3 POWER SUPPLY IC

600mV 855mV

P-CON P-ANT

AM+B AUDIO+B VCC

BU5V ILLUMI

PRE OUT

CD/MD CHANGER

SP OUT

BACK UP

ACC

OEM REMOTE TEL MUTE P-ANT P-CON

3600mV 3600mV

MECHA ASSY (X92-)

CD PLAYER UNIT (X32-5750-00)

CLOCK

PICK-UP (DPU1)

TR COIL FO COIL

DM1

SPINDLE MOTOR

DM2

LOADING & SLED

MOTOR

D. GND

APC

IC3

VREF

MOTOR DRIVER

H L

SLED

Q5,6,D3

CURR.

AMP

S. GND

IC1

RF AMP

D. GND

VREF

16.934MHz

IC2

SERVO

PROCESSOR

u-COM

DRV MUTEMUTE

VREF

A+5V

A. GND

D. GND

REF

SW +5V

D. GND

5V REG

IC4

LPF

8V SW

5V 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-3028/328

COMPONENTS DESCRIPTION

● ELECTRIC UNIT (X34-3390-1x)

Ref. No. Application / Function Operation / Condition

IC1 SYSTEM µ-COM System control. IC3 POWER SUPPLY DC5V x 1, 7.8V x 1, 8.0V x 1, 10.2V, P-CON, P-ANT output. IC4 POWER IC Signal amplifier. IC6 MUTE LOGIC Mute action control. IC8 RESET IC “L” when detection voltage is below 3.6V. IC10 E-VOL & TUNER E-vol, tuner, stereo decode. IC11 E2PROM Save & load for tuner adjustment data. IC15 LED & VFD+B Output voltage 11.25V for LED and VFD. Q51 SERGE DET “ON” when the base goes “H”. Q52 BU DET “ON” when the base goes “H” during BU is applied. Q53 ACC DET “ON” when the base goes “H” during ACC is applied. Q54 BU5V SW “ON” when the base goes “L”. Q71 SERVO+B CONTROL SW “ON” when the base goes “H”. Q72 SERVO+B AVR Output voltage is 7.5V. Q73 SERVO+B AVR Output voltage is 7.5V. Q74 IC3 CONTROL SW “ON” when the base goes “H”. Output voltage is 10.2V. Q151 PANEL 5V SW “ON” when the base goes “L”. Q152 FL+B SW “ON” when the base goes “L”. Q153 FL+B SW “ON” when the base goes “H”. Q156 EJECT ILLUMI SW “ON” when the base goes “H”. Q252 IC4 STBY SW “ON” when the base goes “L”. Q330 Q351/Q352 MUTE DRIVER “ON” when the base goes “L”. Q351 Lch PREOUT MUTE SW Audio preout is muted when the base goes “H”. Q352 Rch PREOUT MUTE SW Audio preout is muted when the base goes “H”. Q501 AM RF AMPLIFIER Adjusts for 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

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.

KDC-3028/328

COMPONENTS DESCRIPTION

Ref. No. Application / Function Operation / Condition

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”. 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 (X16-2910-11)

Ref. No. Application / Function Operation / Condition

IC1 VFD DRIVER IC2 REMOTE CONTROL Q4 SW 5V The power supply of IC2 turns on when Q4’s base goes “L”. Q10 RED LED SW RED LED turns on when Q10’s base goes “H”.

APC (AUTOMATIC POWER CONTROL)

LD power control.

● DAUGHTER UNIT (X89-2690-10)

Ref. No. Application / Function Operation / Condition

Q221, 222 2-PREOUT MUTE “ON” when the base goes “H”. Q225 2-PREOUT MUTE “ON” when the base goes “H”.

KDC-3028/328

MICROCOMPUTER’S TERMINAL DESCRIPTION

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

Pin No. Pin Name I/O Application Processing Operation

1 DCERR I DC offset detection input 2 LINE MUTE I Phone detection 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 FVD driver 9 VFD DATAS O Data output to FVD driver 10 VFD CLK O Clock output to FVD driver

11 VFD RST O Reset output to FVD driver

12 VFD CE O Chip enable output to VFD driver 13 ROTARY CCW I Rotary encoder input 14 FLIP DET I Panel detection Panel released : H, Panel ON : L 15 PWIC BEEP O Beep output 16 LX DATA S I Data from slave unit 17 LX DATA M O Data to slave unit 18 LX CLK I/O LX-BUS clock 19 NC -

20 TUN ADJ I For adjusting IC10

21 TUN SD I Tuner search stop input H : Station exists, L : Station does not exist 22 LX RST O Hard reset to slave unit H : Reset, L : Normal condition 23 LX CON O Start-up request to slave unit H : Slave unit ON, L : Slave unit OFF 24 LX REQ M O Communication request to slave unit 25 AUD SDA I/O Tuner + volume I2C data input and output 26 AUD SCL I/O Tuner + volume I2C clock input and output 27 PWIC STBY O Power IC standby output Power IC ON : H, Power IC OFF : L 28 VOL MUTE O E-VOL mute output L : Mute OFF, Hi-Z : Mute ON 29 PWIC MUTE O Power IC mute output Power OFF : L, Standby : L, Tel mute : L 30 RDS AFSM 31 RESET2 O Mute for reset Output L 32 NC 33 VSS1 34 NC 35 ACC DET I ACC detection ACC exists : L, ACC does not exist : H 36 BU DET I Momentary power-down detection BU exists : L, BU does not exist (Momentary power-down) : H 37 PON I/O SW5V/SW14V control Power ON : L, Power OFF : Hi-Z 38,39 PS2-2, PS2-1 O Power supply control output Refer to “POWER IC CONTROL” on the TRUTH TABLE

Display OFF, Key reset, Panel opened : 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-3028/328

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application Processing Operation

40~42 PS1-1~PS1-3 O Power supply control output Refer to “POWER IC CONTROL” on the TRUTH TABLE 43 KEY CDEJ I Eject key L : Eject 44 PON CD I/O Power supply control for MP3/WMA ON : L, OFF : Hi-Z 45 CD MUTE I CD mute request L : Mute request 46 CD MSTOP O CD mecha µ-com stop H : mecha µ-com operates, L : mecha µ-com is stopped 47

48 CD LOEJ I/O CD motor control

49 CD MOTOR O CD motor control

50 CD DISC8 SW 51 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

59 EJECT ILLUMI O Eject illumination control LED ON when FLIP-DOWN DET is H and PANEL DET is L.

60 RESET I 61 PANEL DET I Panel detection Panel OFF : L, Panel ON : H

62 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 LX REQ S I Communication request from slave unit 67 VSS0 68 VDD1 69,70 X2, X1 71 TEST 72,73 XT2, XT1 74 VDD0 75 AVDD 76~78 79 NC 80 TUN SMETER I Tuner S-meter input

CD LOE LIM SW

OEM DISP DATA

TYPE 3~TYPE 1

I CD detection (chucking switch) H : Loading is finished, L : Disc does not exist

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

I/O External display chip data External display

LED ON : H, LED OFF : L

LED blinks when FLIP-DOWN DET is H and PANEL DET is L.

VFD ON : H, VFD OFF : L Flip-down detection H : L, Flip-down detection L : H

I Destination switch

MICROCOMPUTER’S TERMINAL DESCRIPTION

● TRUTH T ABLE

TUN TYPE

General models commercially-designated as pure KENWOOD brand (Initial value) Initial value setting General models commercially-designated as pure KENWOOD brand (CRSC is changed) Multi-Path Band-Path Gain = 12dB, Multi-Path Charge Current = 0.4µA, De-Emphasis = 75µS

POWER SUPPLY IC (IC3) CONTROL

SW1 (Pin No. 10)

PS1-1 PS1-2 PS1-3 AUDIO P-CON P-ANT

LLLOFFOFF OFF HLLONOFF OFF HHLONONOFF HHHONONON

KDC-3028/328

TYPE 1 TYPE 2

SW2 (Pin No. 11)

PS2-1 PS2-2 ILLUMI FM+B AM+B

LLOFF OFF OFF HLONON OFF HHONON ON

CD MECHA CONTROL OPERATION

CD LOEJ CD MOTOR CD MECHA OPERATION

LH Load

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

KDC-3028/328

MICROCOMPUTER’S TERMINAL DESCRIPTION

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

Pin No. Pin Name I/O Application Processing Operation

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 -

KDC-3028/328

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application Processing Operation

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 MUTE L O Audio Lch mute output. 62 MUTE R O Audio Rch mute output. 63 RST I LSI reset input. 64 OCD CLK 65 MSTOP I Standby detection. 66 DATA I/O 67 SBIO I Data input. During serial writer is connected. 68 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).

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.

KDC-3028/328

TEST MODE

How to enter the test mode

While simultaneously press PRESET “1” k e y 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”.

• CRSC 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 (Display) : x x x x x x x x

PRESET

“2” key (Display) : x x x x x x x x

PRESET

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

PRESET

“4” key time display

•Version display (8 digits : month, date, hour, minute)

• Serial number display (8 digits)

•When pressed for less than 1 second : POWER ON

(Display) : PON x x x x x 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) : PLY x x x x x 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) : EJC x x x x x 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) : PNL x x x x x 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 : ROM _ Rxxx (x : number) Not effective (When not able to read) Not effective (When version is different)

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

key the following page.)

(Display)

Adjustment complete : E2P _ OK _ _ Adjustment not completed : E2P _ ER _ _ Communication error : I2C _ ER _ _

* 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 : I2C _ OK _ _ Communication error : I2C _ NG _ _ Not detected : ERR _ n – – – (n : 1~3) Detected : ERR _ n-✳✳ (✳✳ : error code)

* The display is cleared by pressing the key for more

than 2 seconds.

: ROM _ R – – –

: ROM _ R✳✳✳

KDC-3028/328

SPECIAL MODE

● Security

•

How to enter the forced POWER ON mode

While “– – – –” is being displayed, while simultaneously pressing “Q” key and “4” key, press “RESET” button, With this, it is possible to turn the power on for 30 minutes only.

• How to clear the programmable security code

1. While “– – – –” is being displayed, press “ ” for 3 seconds

or more while pressing the “A UTO” key. This makes the “– – – –” display disappear.

2. Input “KCAR”, using the remote controller.

Press “5” key of the remote controller twice (Input for “K”) and press “ Press “2” k e y of the remote controller 3 times (Input for “C”) and press “ ” key. Press “2” key of the remote controller once (Input for “A”) and press “ ” key. Press “7” key of the remote controller twice (Input for “R”) and press “ ” key.

3. The security is cleared and the unit enters ST ANDBY source

mode.

4. If wrong codes are input, “– – – –” will be displayed again.

” key.

● 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 : DC _ ERR _ _

Not detected : DC _ OK _ _ _

* By pressing “AUTO” or “TI” key while “DC _ ERR _ _” is

being displayed, detection status is cleared. This will result in the display of “DC _ OK _ _ _”.

Release Method : Press “RESET” button.

● Mechanism memory clear confirmation mode

Confirmation mode :

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

*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 _ X _ _ _

Release Method : Press “RESET” button.

● FM/AM channel space switching

When in the conditions of ACC ON and POWER OFF, while depressing PRESET “1” key and PRESET “5” key simultaneously, press “SRC” key.

KDC-3028/328

ADJUSTMENT

After replacing the following parts, adjust as follows.

REPLACED PARTS ADJUSTMENT ITEMS

Ref. No.

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

● 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.

• SG setting

FREQUENCY MODULATION ANTENNA INPUT

1000kHz OFF 35dBµV (EMF)

● 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

FREQUENCY MODULATION ANTENNA INPUT

5dBµV (LOAD) or

87.9MHz OFF 11dBµV (EMF)

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