Kenwood MD-X02 Service Manual

70%

MD PERSONAL STEREO SYSTEM

SOUND

PUSH OPEN

MD RECREPEAT

VOLUME/MULTI CONTROL

TUNER

FM/AM

STANDBY/TIMER

TUNE MODE

STOP/

POWER

SET/DEMO

・

TUNING

MD PERSONAL STEREO SYSTEM

DISC LOADING MECHANISM

EJECT

BEST HITS

FM 75

GND

ANTENNA

PHONES

AC IN

MDX-01/02

SERVICE MANUAL

Front cabinet(OUTER) ass'y (A60-1942-08): L (A60-1943-08): R (A60-1944-08): D (A60-1946-08): H (A60-1947-08): S

MD door (A52-0918-08)

Door lens (B12-0408-08): L (B12-0409-08): R (B12-0410-08): D (B12-0412-08): H (B12-0413-08): S

Knob A (K27-7893-08): S (K29-7895-08): L (K29-7896-08): H (K29-7898-08): D (K29-7899-08): R

Knob B (K29-7900-08)

Top plate R ass'y (A60-2059-08): DHLR (A60-2060-08): S

Door (A52-0914-08): DHLR (A52-0915-08): S

Handle(REAR) (K01-0134-08): L (K01-0135-08): H (K01-0137-08): D (K01-0138-08): R (K01-0140-08): S

Handle (K01-0139-08)

Rear cabinet (A02-2987-08): S (A02-2988-08): DHLR

AC socket (E03-0375-08)

D: ORANGE, H: GREY, L: BLUE, R: RED, S: SILVER

In compliance with Federal Regulations, following are

repro-duction of labels on, or inside the porduct relating to laser product safety.

Note: Please contact KENWOOD service in your side if

you want to get the AC power cord.

Antenna terminal (E70-0114-08)

KENWOOD-Crop. certifies this equipment conforms to DHHS

Stereo jack (E11-0398-08)

Regulations No.21 CFR 1040. 10, Chapter 1, Subchapter J.

DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM.

AM loop antenna (x1) (T90-0868-08)

Remote control unit (x1) (A70-1440-08): DLH (A70-1441-08): R (A70-1442-08): S

Battery cover (A09-1191-08)

R6/SUM-3 batteries

AC plug adaptor (E03-0115-05)

for remote (x2)

MDX0001

AM loop antenna stand (x1) (A09-1201-08)

MDX-01/02

Caution on condensation

Condensation (of dew) may occur inside the unit when there is a great difference in temperature between this unit and the outside. This unit may not function properly if condensation occurs. In this case, leave the unit for a few hours and restart the operation after the condensation has dried up. Be specially cautious against condensation in a following circumsatance: When this unit is carried from a place to another across a large difference in temperature, when the humidity in the room where this unit is installed increases, etc.

Note related to transportation and movement

Before transporting or moving this unit, carry out the following operations.

(1) Remove the CD or MD from the unit. (2) Press the 6 key of the MD. (3) Wait for some time and verify that the

display becomes as shown in the figure.

(4) Press the 6 key of the CD. (5) Wait for some time and verify that the

display becomes as shown in the figure.

(6) Wait a few seconds and turn the unit

OFF.

CONTENTS / ACCESSORIES

Contents

CONTENTS / ACCESSORIES .................................. 2

DISASSEMBLY FOR REPAIR....................................3

CIRCUIT DESCRIPTION ............................................4

ADJUSTMENT ............................................................8

PARTS DESCRIPTIONS ............................................9

Accessories

PC BOARD .............................................................. 10

SCHEMATIC DIAGRAM .......................................... 13

EXPLODED VIEW ....................................................25

PARTS LIST..............................................................27

SPECIFICATIONS ......................................Back cover

DISASSEMBLY FOR REPAIR

1. How to Remove Front Cabinet

1. Remove 6 screws(1) from the rear cabinet side.

2. Remove 2 screws(2) fixed CD and the front cabinet.

3. Remove 3 screws(3) from the bottom front side.

4. Move the front cabinet frontwards(4).

2. How to Remove CD and Top Covers

1. Remove 2 screws fixed CD and top covers(5).

2. Remove 8 screws fixed the carrying handle (6x4) and the rear cabinet(7x4).

3. Turn the antenna cap(8) to remove and lift the carrying handle and CD mechanism(9).

MDX-01/02

3. How to Remove MD Mechanism

1. Remove the screw(0) fixed the AC inlet socket.

2. Remove 5 screws fixed the bottom cabinet(!x3) and the power transformer(@x2).

3. Move the main pcb frontwards(#).

4. Remove 3 screws($) fixed the MD mechanism.

MDX-01/02

CIRCUIT DESCRIPTION

1. INITIALIZATION

1-1 How to Set Initialization

Insert the power cord to AC outlet with pressing REPEAT key.

1-2 Operation in Initialization mode

Display shows INITIALIZE, and Standby mode after mechanism check. The Display shows error code if mechanism has malfunction.

Error Code

CD In 1st figure "C" MD In 3rd figure "M"

CD Door SW In 7th figure "S"

The until changes to shipment mode after RAM and backup clear, disc out, and so.

2. TUNER PRESET

P.CH BAND FREQ. P.CH BAND FREQ.

1 FM 98.30 MHz 21 AM 531 kHz 2 FM 87.50 MHz 22 FM 87.50 MHz 3 FM 89.10 MHz 23 FM 87.50 MHz 4 FM 108.00 MHz 24 FM 87.50 MHz 5 FM 90.00 MHz 25 FM 87.50 MHz 6 FM 87.50 MHz 26 FM 87.50 MHz 7 FM 87.50 MHz 27 FM 87.50 MHz 8 FM 87.50 MHz 28 FM 87.50 MHz

9 AM 1602 kHz 29 FM 87.50 MHz 10 AM 999 kHz 30 FM 106.00 MHz 11 AM 630 kHz 31 FM 87.50 MHz 12 AM 1440 kHz 32 FM 87.50 MHz 13 FM 106.00 MHz 33 FM 87.50 MHz 14 AM 531 kHz 34 FM 87.50 MHz 15 FM 87.50 MHz 35 FM 87.50 MHz 16 FM 98.00 MHz 36 FM 87.50 MHz 17 FM 98.50 MHz 37 FM 87.50 MHz 18 FM 87.50 MHz 38 FM 87.50 MHz 19 AM 990 kHz 39 FM 87.50 MHz 20 FM 97.70 MHz 40 AM 945 kHz

3. TEST MODE

3-1 TEST Mode Setting

TEST MODE SETTING

CD MD REC

MD 1 SKIP UP Insert the power cord

✽ FTC & Sub-Clock to outlet with pressing

Oscillation Check BEST HITS every left key

Mode

MD mode2 SKIP DOWN

FTC&Sub-Clock Oscillation Check Mode

✽

FTC test mode is after Sub-Clock Oscillation Check

Mode(Internal Oscillation, Check of Period) Check Mode

is 5 times maximum. FTC carries if 1 tlme OK.

The unit is STOP mode after display shows error if 5

times NG.

No Oscillation îERR 1 Period NGîERR 2

(FTC mode is factory use only)

3-2 Test Mode Cancel

The unit cancel the test mode after initialization if pull out

power cord.

The unit cancel the test mode after no initialization if

power off.

3-3 Key Function in Test Mode

KEY

CD PLAY

STOP

SKIP UP

SKIP DOWN

T-SERVO ON(05) uw T-SERVO OFF(03) Stop to CD operation(01)

TB/FB (07)

TG/FG (08)

FE/RF (09)

TE/VC (10)

HI SPEED(double speed) uw NOR SPEED: in playback

Playback in STOP mode. Track up of CD. FF search of CD if key pressed more 400ms. Pickup move outwards in STOP mode if key pressed more 400ms. Playback in STOP mode. Track down of CD. FB search of CD if key pressed more 400ms. Pickup moves inwards in STOP mode if key pressed more 400ms.

CD MODE

In STOP mode.

Selfcheck result shows 2 figures

MD MODE 1

– Stop to operation. Change to mute-off.

Choose the REC input; digital or analog in stop mode.

Track up of MD. FF search of MD if key pressed more 400ms.

Track down of MD. FB search of MD if key pressed more 400ms.

4. MD TEST MODE FOR ADJUSTMENT

4-1 Entering the Test Mode (MD Mode2)

While pressing the SKIP DOWN key, turn the AC on.

4-2 Cancelling the Test Mode

Turn the AC off.

4-3 Key Operations for Adjustment

KEYS OPERATION

SKIP UP/DOWN Select mode or adjustment value change.

MD PLAY/PAUSE Fix mode or adjustment value.

STOP Cancel the selected mode.

SKIP UP ✽ Pickup moves outwards when pressed skip up key.

SKIP DOWN ✽ Pickup moves inwards when pressed skip down key.

✽ Remote control only.

4-4 Selection of Adjustment Test Mode

Whenever the [volume/multi-control] knob is turned, the adjustment test mode is selected.

No. LCD DESCRIPTION SECTION

1 TEMP ADJU 2 LDPWR ADJU Laser power adjustment. 5-6

3 LDPWR CHEC Laser power check. 5-6 4 EFBAL ADJU Traverse adjustment. 5-7 5 TE B. ADJ Automatic EF balance adjustment. 6 FBIAS ADJU Focus bias adjustment. 5-8 7 CPLAY MODE Continuous playback mode. 4-5 8 CREC MODE Continuous recording mode. 4-6

✽9 STT-LIMIT

✽10 JUMP MODE Track jump checking mode. - ✽11 SRV DAT RE Servo data reading. - ✽12 EEP MODE E2PPROM data reading or rewrite. - ✽13 EEP INITIAL E2PPROM data initializing. -

For more information on each adjustment mode, refer to each section of 5, "Electrical adjustment". If other adjustment mode has been entered incorrectly, press the STOP key to exit the mode.

✽ The number 9 - 13 are not used for service. If these

mode have been entered incorrectly, press the STOP key immediately to exit the mode. Specially, do not use EEP INITIAL. (E2PROM data has initialized if used it.)

The work of adjustment is unnecessary

in this mode.

Check the mechanism start limit

switch position.

5-5

MDX-01/02

1. Setting of Continuous Playback Mode

No. Key

4 ¢

Select [CPLAY MODE] 2 Load disc 3 PLAY [CPLAY MID]

[c=xxxx a=yy] error

(xxxx=C1 error, yy=ADIP error)

[CPLAY OUT]

[c=xxxx a=yy] error

(xxxx=C1 error, yy=ADIP error)

4 STOP

[CPLAY MODE]

2. Change of Playback Points(in continuous playback mode)

No. Key

Display/Function

PLAY

[CPLAY IN]

[c=xxxx a=yy] error

(xxxx=C1 error, yy=ADIP error)

PLAY

Carry out No.1 to 3 in the above table.

4 5

STOP [CPLAY MODE] EJECT Disc out

1. Continuous Recording Setting

No. Key Display/Function

4 ¢

Select [CREC MODE] 2 Load the recordable disc 3 PLAY [CREC MID] 4 PLAY [CREC (zzzz)] CREC address

(0300h cluster=recording start point) 5

STOP [CREC MODE]

2. Change and End of Recording Points

1 Carry out No.1 to 3 in the above table Select[CREC MID] 2

[CREC OUT] 3 PLAY [CREC (zzzz)] CREC address

(0700h cluster=recording start point) 4 STOP [CREC MODE]

¢ (2time)

Select [CREC IN] 7 PLAY [CREC (zzzz)] CREC address

(0300h cluster=recording start point) 8 STOP [CREC MODE]

PLAY [CREC MID]

9 EJECT Disc out

Pick-up

Flexible board

Laser tap

No.

Key Display/Function

4 ¢

Select [TEMP ADJU]

2 PLAY [TEMP=xx (yy)]

(xx=compensation data, yy=setting temperature)

4 ¢

Input "yy" with present temp..

4 PLAY [TEMP=✽✽SAVE] in writing data

[TEMP ADJU ST]

CIRCUIT DESCRIPTION

4-5 Continuous Playback Mode

4-6 Continuous Recording Mode

1. The recording start addresses of IN, MID, and OUT are described below.

IN 30H cluster MID 300H cluster OUT 700H cluster

2. An erasure prevention control is not detected in the test mode. Be careful not to enter the continuous recording mode using a disc containing the data that should not be erased.

3. Do not record continuously for more than five minutes.

4. Take care that no vibration is applied during continuous recording.

5. ELECTRICAL ADJUSTMENT

5-1 Precaution during confirmation of Laser

Diode emission

During adjustment, do not view the emission of a laser diode from just above for confirmation. This may damage your eyes.

5-2 Precaution on handling of Optical pick-up

(KMS-260B)

The laser diode in an optical pick-up is easy to be subject to electrostatic destruction. Therefore, solderbridge the laser tap on the flexible board when handling the optical pick-up.

When removing the flexible board from the connector, make a solder bridge in advance, then remove the board. Be careful not to remove the solder bridge before inserting the connector. Moreover, take careful measures against electrostatic destruction. The flexible board is cut easily. Handle the flexible board with care.

5-3 Precaution during adjustment

1) Perform the adjustment and confirmation marked with “O” in the order shown in the table when the parts below are replaced.

Optical BD board

1.Temperature compensation offset adjustment X O O O

2.Laser power adjustment O O X O

3.Traverse adjustment O O X O

4.Focus bias adjustment O O X O

5.Error rate confirmation O O X O

pick-up IC6 D101 IC1,IC2,IC10

2) In the test mode, perform the adjustment. After adjustment is completed, cancel the test mode.

3) Perform the adjustment in the order described.

4) Use the following tools and measurement equipment.

• CD test disc TGYS-1

• Laser power meter

• Oscilloscope (with bandwidth of more than 40 MΩ)

(Calibrate the probe before measurement.)

• Digital voltmeter

• Thermometer

5) Take care that VC and GND (ground) are not connected on the oscilloscope when two or more signals are monitored on the oscilloscope. (VC and GND are short-circuited in this case.)

5-4 Creating the recordable continuous recording

disc

This disc is used for focus bias adjustment and error rate confirmation. How to create the recordable continuous recording disc is 4-6.

5-5 Offset Adjustment

5-6 Laser Power Check and Adjustment

Laser power setting in playback and recording modes. Preparation

1. Remove the MD mechanism from the unit.

2. Connect the digital voltmeter to IOP1 and 2 on X33 pcb.

3. Remove the top plate from traverse unit.

4. Remove the magnetic head.

5. Remount the MD mechanism to the unit

MDX-01/02

1. Recordable Disc

No. Key Display/Function

1 Connect the oscilloscope to TE1 and VC in X33 pcb 2 4 ¢ Select [EFBAL ADJU]

3 Load the recordable disc 4 PLAY [EFBAL MO-W] 5 PLAY [EF=$✻✻MOW] 6 4 ¢

Write power adjustment. Adjust the waveform as follows.

7 PLAY Display shows [EF=$✻✻MOR] after [EFB=✻✻xSAVE]

to save the data in E2PROM.

Mode changes write to read

Focus and disc servo are on. Tracking servo off.

8 4 ¢

Read power adjustment. Adjust the waveform as follows.

9 PLAY

Save the data in E2PROM. Display shows [EFBAL MO-P]

PLAY Display shows [EF=$✻✻MOP]

(Pickup travels to search pits and tune the servo to on.)

10 4 ¢ Adjust the waveform as follows.

11 PLAY Display shows[EFB=✻✻xSAVE]

to save the data in E2PROM. Display shows [EFBAL CHAN]

12 EJECT Unload disc.

2. Pre Master Test Disc(TGYS-1)

No. Key Display/Function

1 Load the disc(TGYS-1). [EFBAL CD] 2 PLAY

PLAY

[EF=$✻✻CD] servo is on

3 4 ¢ Adjust the waveform as follows.

4 Save the data in E2PROM.

Display shows[EFB=✻✻xSAVE] in brief time. [EF PHASE]

5 EJECT Unload disc.

(TE1)

330kΩ

10pF

(VC)

Oscilloscope

TE1 VC

Oscilloscope

X33 ADJUSTMENT

V: 0.5V/div H: 10ms/div INPUT: DC mode

Laser power meter

Digital voltmeter

Objective lens of optical pick up

IOP2 IOP1

X33 ADJUSTMENT

1. Laser Power Adjustment

No. Key Display/Function

1 4 ¢ [LDPWR ADJU]

Load recordable disc

Load the disc and lazer on [(a0.9mW) $xx] read power (xx=power value)

43EJECT

PLAY

Unload the disc and laser on

5 PLAY [LDPWR CHECK] 6 1 ¡ Move the pickup to check the laser power with

laser power meter sensor

7 4 ¢

Adjust "xx" so that the power meter shows 0.9mW.

8 PLAY [(a7.0mW) $xx] writing power 9 4 ¢ Adjust "xx" so that the power meter shows 7.0mW.

This adjustment should be carried out in 15 secs.

10 PLAY Laser power off

Display shows [LDPWR ADJUST] after [LDPWR<$xx] to save the data in E2PROM

Start from No.2 if readjust.

2. Laser Power Check

No. Key Display/Function

1 4 ¢

[LDPWR CHEC]

2 PLAY [(c0.9mW) $xx]

(xx=0.85 to 0.95mW)

3 PLAY [(c7.0mW) $xx]

Laser power meter: 7.0±1.0mW✽ VOM:optical pickup indication value ±10%✽

✽ In this case, lop = 82.5 mA lop(mA) = Reading of digital voltmeter(mV)/1(Ω)

(optical pick-up label)

KMS

260B 27x40 B0825

CIRCUIT DESCRIPTION

5-7 EF Balance(Traverse Adjustment)

Connection :

During this adjustment, the oscilloscope changes in units of about 2%. Adjust so that the waveform comes nearest to the specified value. (MO groove read power traverse adjustment)

(Traverse waveform)

Specification : A = B

Notes :

1. Data is erased during MO write when a recorded disc is used for this adjustment.

2. If the traverse waveform is difficult to be monitored, connect an oscilloscope as shown in the figure below.

A/D keys

EEPROM Write

M30624MG-308FP

RELAY

POWER key

RESET

LED

Remote key

LCD Back Light

LCD CD

DSP

u-COM

Control

KEY1-3

V.DET.

SENS

TUNER ON/OFF, SA CLK, SA DATA

ST, SD,PLL DO

MD CE

SQSO

LCDSDA

LCDCS

LED0, LED1

BL0,BL1

REMOCON

RESET

RELAY

SCL

SDA

SCOR

CRXD CTXD

LCDRS

LCDSCL LCDRES

SQCK MD RST

CLS SW

CD POWER, LDC,HI SP. SCLK. CD CLK.XLAT.CD DATA.XRST

AC/BATTERY

CD Door Control

TUNER PLL IC

SYSTEM IC LC75396NC

TUNER

SYSTEM IC

MDX-01/02

No. Key Display/Function

1. CD Error Rate

4 ¢

[CPLAY MODE] 2 Load the test disc(TGYS-1) 3 PLAY Display shows [CPLAY MID]

Access end

[c=xxxx a=yy] xxxx=C1 error (lower 20) yy=AIDP error 4 STOP [CPLAY MODE] 5 EJECT Unload disc.

2. MO Error Rate

No. Key Display/Function

4 ¢

[CPLAY MODE] 2 Load the recordable disc 3 PLAY Display shows [CPLAY MID]

Access end

[c=xxxx a=yy] xxxx=C1 error (lower 50) yy=AIDP error(00) 4 STOP [CPLAY MODE] 5 EJECT Unload disc.

No. Key Display/Function

4 ¢

Select [FBIAS ADJU] 2 Load the disc. 3 PLAY [a=xx yyyy/] point a

(xx=focus bias, yyyy=C1 error) 4

4 ¢

Adjust "yyyy" to 220

✻

5 PLAY [b=xx yyyy/] point b 6

4 ¢

Adjust "yyyy" to 220

✻

7 PLAY [C=xx yyyy/] point c

Check "yyyy" within 50 8 PLAY Display shows [aa bb cc(xx)] focus bias adjust

(aa= point a,bb=b,cc=c )

CIRCUIT DESCRIPTION

5-8 Focus Bias Adjustment

Use the special disc(continuous recorded disc)

* Notes :

1. The relation between the C1 error and focus bias value is shown in the figure below. Points "a" and "b" in the figure are detected by the above adjustment. Focal position "C" is automatically obtained from points "a" and "b" by calculation.

2. The C1 error rate fluctuates. Therefore, perform the adjustment according to the observed mean value.

C1 error

Focus bias value

5-9 Error Rate Check

6. Microprocessor: M30624M-308FP(IC401)

6-1 Periphery Block Diagram

MDX-01/02

6-2 Microprocessor's Port Description

Port # Port Name I/O Description

1~3 NC - No use

4 SDA O EEP ROM data 5 SCL O EEP ROM clock 6 RELAY O Main power supply control ON OFF 7 CE I No power supply detection AC ON AC OFF 8 BYTE - GND

9 CNVSS - GND 10 XCIN I Oscillation for clock(32.768MHz) 11 XCOUT O Oscillation for clock(32.768MHz) 12 RESET I Microprocessor reset port NORMAL RESET 13 XOUT O Oscillation for main clock(10MHz) 14 VSS - GND 15 XIN I Oscillation for main clock(10MHz) 16 VCC(B.U.) I Standard voltage for A/D converter(+5V) 17 NMI I +5V 18 REMOCON I Remote control signal H L: interrupt 19 POWER KEY I Power key signal control other backup 20 SCOR I Sub-code synchro signal control L H: interrupt 21 LCD RS O Reset port of LCD driver

22,23 NC - No use

24 B.L.0 O Back light dimmer. L=dark, H=bright(#26 port(B.L.1)=L) 25 LED0 O Standby led control OFF ON 26 B.L.1 O Back light dimmer. H=dark, L=bright(#24 port(B.L.0)=L) 27 LED1 O Timer led control OFF ON 28 LCD CS O CS port of LCD driver 29 CTXD O TXD port of UART 30 CRXD I RXD port of UART 31 LCD DATA O Data port of LCD driver 32 NC - No use 33 LCD CLK O Clock port of LCD driver 34 LCD RST O Reset port of LCD driver 35 NC - No use 36 SQSO I CD sub-code 37 SQCK I Clock for CD sub-code 38 MD CE O MD IC CE 39 MD RST O MD reset signal RESET NORMAL

40~55 NC O No use

56 CD ON/OFF O CD power control ON OFF 57 NC - No use 58 AMUTE O Audio mute signal OFF ON 59 TU CLK O PLL/SYSTEM IC clock 60 ST I Tuner stereo signal MONO STEREO 61 SD I Tuning signal NO TUNED 62 VCC(B.U.) O No use 63 NC - No use 64 VSS - GND 65 TU DATA O PLL/SYSTEM IC data 66 TU CE O PLL/SYSTEM IC CE 67 PLL DO I PLL IC data 68 NC - No use 69 LDC O CD laser control ON OFF 70 CLS SW I CD door close detection OFF ON 71 OPN SW - No use 72 CLOSE O No use

CIRCUIT DESCRIPTION

ACTIVE

MDX-01/02

CIRCUIT DESCRIPTION

Port # Port Name I/O Description

73 OPEN O No use 74 HI SP O Recording signal in high speed mode NORMAL 75 SCLK O CD sense clock 76 SENS I CD sense 77 CD CLK O Clock for CD DSP 78 XLAT O Latch for CD DSP 79 CD DATA O Data for CD DSP 80 CD XRST O Reset for CD DSP NORMAL RESET 81 CODE I Model selector 82 CODE I Model selector KITTY NORMAL 83 CODE I Model selector

84~87 NC - No use

88 LOOP - No use

89,90 NC - No use

91 V.DET I AC power supply detection(less 1.25V:detect) 92 NC O No use

93~95 KEY1~3 I Key signal ON OFF

96 AVSS - GND 97 NC - No use 98 VREF I Standard voltage for A/D converter 99 VCC(B.U.) I Standard voltage for A/D converter(+5V)

100 NC O No use

ACTIVE

6-3 Key Matrix

✽ Reference voltage=5V.( )=Port of Microprocessor

Voltage[V] 0.00~0.46 0.47~1.32 1.33~2.14 2.15~3.00 3.01~3.80 3.81~4.60 more 4.61

KEY 1

(#93) EJECT

KEY 2

(#94)

KEY 3

(#95) DOWN

- SKIP UP

POWER CD BEST HITS TUNER REPEAT SOUND KEY OFF

STOP

SKIP

VOL.+ VOL.- MD MD RE KEY OFF

SET/DEMO MENU - KEY OFF

+ 21 hidden pages