Kenwood KMD-44 Service manual

2001-2 PRINTED IN JAPAN

B51-7737-00 (N)1529

MD RECEIVER

KMD-44

SERVICE MANUAL

MDLP

LOUD SCAN ROM REP M.ROMD.SCN

AUTO AME CLK NAME.S

DISC

45Wx4

KMD-44

PWR

SRC

DISC

OFF

AUD

CD MD-CHANGER CONTROLMD RECEIVER

Plastic cabinet assy (A02-1486-13)

Screw set (N99-1610-15)

DC cord (E30-4783-05)

Stay (J54-0606-04)

Screw set (N99-1632-05)

Lever (D10-3031-04)x2

Mounting hardware assy (J21-9491-13)

Front glass (B10-4030-01)

Escutcheon (B07-2181-02)

Panel assy (A64-2261-02)

KMD-44

BLOCK LEVEL DIAGRAM

SDA SCL

AFS

SCL SDA

S-METER

REMO

L D ATAS

L CLK

L CE

L D ATAL

L INH

MD +B

SW 5V

P-ON

ILL ON

LOE SWEJLO

LOS SW

M STOP

M RST

A MUTE

M SDA

M SCL

PANEL

DATA C

REQ H

DATA H

CLK

MUTE

REQ C

AM +B

FM +B

MUTE

VDD

BU DET.

ACC DET.

PHONE

P-ANT

P-CON

LOS SW

LOE SW

M SDA

A MUTE

M RST

M STOP

M SCL

AUDIO

BU 5V

S 5.0V

AUDIO 8V

MUTE

AUDIO

FM,AM

SCL

OUT

VDD

SDA

AFS

VDD

PLL +B

FM +B AM +B

SCL

IF2 +B

AUDIO

IF1 +B

S-METER

SDA

CLK

REQ C

MUTE

DATA H

DATA C

REQ H

AUDIO

SW 5V

P-ANT

P-CON

TEL MUTE

ACC

BACK UP

PRE OUT SP OUT

AUDIO

BU 14V

3529mV

588mV

1819mV

3795mV

380mV

1200mV

724mV

1200mV

170mV 166mV

1692mV(J,K)

547mV(J,K)

BU 5V

Q1,2

Q10

Q11-15

IC6

IC3

Q7-9

IC1

IC8

IC1

IC2

Q25-28

IC4

Q17,18

AVR

SW-REG

S 5.0V

ILLUM +B AVR

AVR

AUDIO 8V

u-COM

MD MECHA

P-ANT P-CON

ACC DET. BU DET.

TEL MUTE

MUTE

PRE OUT

E-VOL

F/E

FM +B AM+B

POWER IC

CD/MD CH

KEY MATRIX

WITH

LCD DRIVER

SW 5V

REMOCON

LCD

PANAEL

MD MECHA

CD-CH

E-VOL

PRE OUT AT T

PRE OUT LEVEL

ANT

5V REG

REAR

LEVEL DIAGRAM

BLOCK DIAGRAM

APC

APCREF

EQADJ

3TADJ

WBLADJ

FZC

AUX1

AUX2

PEAK

BOTTOM

ABCD

SWDT

SCLK

XLAT

FOCONT

114

113

112

111

SPFD

SPRD

FFDR

FRDR

TFDR

TRDR

SFDR

SRDR

MNT0

MNT1

MNT2

MNT3

XINT

SQSY

SENS

SRDT

SCLK

SWDT

XLAT

XRST

FZC

XINT

SQSY

SENS

SRDT

SCLK

SWDT

XLAT

XRST

LDON

SDMUTE

LIMIT SW

P-ON

AMUTE

MSDA

MSCL

MSTOP

MRST

TYPE 1

TYPE 2

HOT

ESDA

ESCL

TRK+

TRK-

FCS+

FCS-

SLED+

SLED-

SPDL+

SPDL-

VREF0

VCC2

VCC1

LOAD

EJECT

TFDR

TRDR

FFDR

FRDR

SFDR

SRDR

SPFD

SPRD

REG IN

REG OUT

ENREG

LOAD

EJECT

A8V

L-CH

R-CH

MRST

MSTOP

MSCL (IIC BUS)

MSDA

AMUTE

BU5V

S5V

LOE-SW

LOS-SW

DET-SW

LOAD

EJECT

474648

MORF RFO

AUX 1

FOCONT

XSTBY

ADFG

22.58MHz

104

105

106

107

102

8.38MHz

MUTE 1

MUTE 2

MUTE 3

CH1,2

CH3

CH4

2 1

SW+5V

DAVDD

AUDIO +B

JITTER

RECORD IN

STBY

TO CH5 OP

S+B

SW+5V

S5V

+3.3V

+2.5V

BU+5V

1.2V rms 1KHz 0dB

SW+5V

TO SERVO DRIVER

BU+5V

ILCC

LDON

RF AMP

RF AGC & EQ

RF AMP

CXA2523AR

BPF P-P

PEAK & BOTTOM

ABCD AMP

IV AMP

CVB

AMP

TEMP

VICCONV

ERROR AMP

FOCUS

AT AMP

BPF

TRACKING ERROR AMP

SERIAL PARALLEL DECODER

BALANCE

E-F

FILTER

PLL

DECODER

ACIRC

EFM

MEMORY

RESISTANT

SHOCK

CONTROLLER

DYNAMIC RAM

ATRAC3

ATRAC/

DECODER

DIGITAL

FILTER

DIGITAL

AUDIO I/F

CONVERTER

D/A

POST FILTER

CONTROL

MONITOR

ANALOG MUX

ADIP DEMODULATOR DECODER

SPINDLE SERVO

GENERATOR

PWM

APC

DSP

SERVO

CONVERTER

A/D

CLOCK GENERATOR

AUTO SEQUENCER

I/F

CPU

PROCESSOR

SUBCODE

TC74HCT7007AF

MECHA u-COM

UPD780076YGK

CH2

DRIVER

CH1

DRIVER

DRIVER CH4

DRIVER CH3

VREF

DRIVER CH5

NJM4565MD

LPF

SW+8V

A3.3V REG.

LIMIT SW

LOE-SW

LOS-SW

DET-SW

ATRAC/ATRAC3 DECODER

DET.

REFLECT

APC

CB DA

DETECTOR

TRACKING

COIL

FOCUS

COIL

SLED MOTOR

SPINDLE MOTOR

LOADING/EJECT MOTOR

THERMISTER

EEPROM

BR24C02FV-W 256 8BIT

S-817A25ANB

SW+5V

EFM/ACIRC DECODER SHOCK PROOF MEMORY CONTROLLER

DIGITAL SERVO PROCESSOR DIGITAL SIGNAL PROCESSOR

1M-WORD 4BIT DYNAMIC RAM

DIGITAL FILTER. D/A CONVERTER

CDX2667R

FOCUS/TRACKING COIL DRIVER SPINDLE/SLED MOTOR DRIVER

LA6572

LOADING/EJECT MOTOR DRIVER

IC1

IC4

REG.

2.5V

IC2

IC11

IC9

IC5

IC8

LP2982-3.3

Q10

IC12

Q13

MOTOR ASS'Y

KMS-242B

OPTICAL PICKUP BLOCK

MOTOR BLOCK

X33 UNIT

KMD-44 KMD-44

BLOCK DIAGRAM (MD)

KMD-44

COMPONENTS DESCRIPTION

Ref. No.

Component name Application/Function Operation/Condition/Compatibility

IC1 LC75808W LCD driver with key-matrix IC2 RS-171 Remote control light sensor

DTA114EK or UN2111

Key-matrix permission SW Ready on key-matrix, ON when the base goes "Lo". Q2 2SD2114K Illumination SW(Red) ON when the base goes "Hi". Q3 2SD2114K Illumination SW(Green) On when the base goes "Hi". Q4 2SC2412K or 2SD601A LCD AVR

Ref. No.

Component name Application/Function Operation/Condition/Compatibility

IC1 UPD784216GF531 System MI-COM. IC2 TDA7407D E-VOL. & N.C. MPX

IC3 M5237ML AVR IC

AVR IC is combined with Q5, and it works as the error

detection, the driver. IC4 TDA7386 Power IC IC6 LM2595S-ADJ MD SERVO AVR A DC/DC Converter wiht the ON/OFF function. IC7 S-80830ANNP Reset IC "L" : detection voltage below 3.0V IC8 HD74HC27FP Mute logic 3 input NOR gate x3

IC10 TDA7479D RDS decoder

2SC4081 or 2SD1819A

BU 5V AVR

Inverted darlington connection

2SB1548(P)or 2SB1655(E, F)

On during BU applied.

DTA124EUA or UN5112

Audio 8V AVR ON/OFF control

DTC144EK or UN2213 Audio 8V AVR ON/OFF SW

Q3 is turned ON when Q4's base goes "Hi".

or KRC104S

2SB1548(P)or 2SB1655(E, F)

Audio 8V AVR Output voltage 8.3V Q7 DTC144EUA or UN5213 Q8 DTA124EUA or UN5112 Illumination AVR AVR output is ON when Q7's base goes "Hi". Q9 2SD1760

Q10 2SA1037K SW 5V ON when the base goes "Lo". Q13 2SB1277(Q, R)

Q16

DTC114YK or UN2214 P-CON SW Q13 is turned ON when Q16's base goes "Hi". or KRC107S

Q14 2SA1037K

Protect Q13 by turning ON when P-CON output is grounded.

Q15

DTA124EK or UN2112 P-CON protection

Prevents Q14 turning ON during start-up after power ON.

or KRA103S

Q17 2SC2412K or 2SD601A

BU detection

ON when the base goes "Hi" during BU applied.

(Momentary power down detection)

Q18 2SC2412K or 2SD601A ACC detection ON when the base goes "Hi"during ACC applied.

Q19

DTA124EK or UN2112

Mute driver for Audio mute SW ON when the base goes "Lo".

or KRA103S

Q20

DTC144EK or UN2213

E-VOL. mute SW E-VOL. is muted when the base goes "Hi".

or KRC104S

Q21, 22 DTC143TK or UN2216 Audio mute SW Audio pre-outs are muted when the base goes "Hi".

Q23 DTC114YK or UN2214 SVR SW

POWER IC RESET is activated when the base goes"Hi".

Q24 DTA114YUAor UN5114 Panel detection SW ON when the base goes "Lo" during the panel closed.

Q25

DTC124EK or UN2212 or KRC103S FM+B SW

Q26 is turned ON when Q25's base goes "Hi".

Q26 2SB1277(Q,R)

ON during FM reception

Q27

DTC124EK or UN2212

Q28 is turned ON when Q27's base goes "Hi".

or KRC103S AM+B SW

Q28 2SB1277(Q,R)

ON during AM reception

Q29 2SC4081 or 2SD1819A Composite signal output buffer Q30 2SC4081 or 2SD1819A Noise buffer

Q33

DTC144EK or UN2213

RESET SW

System RESET is activated when the panel reset SW

or KRC104S is pushed

Q34 2SC4081 or 2SD1819A DSI driver ON when the base goes "Hi".

●

SWITCH UNIT (X13-9700-11)

●

ELECTRIC UNIT (X25-8840-11)

KMD-44

COMPONENTS DESCRIPTION

Ref. No.

Application/Function Operation/Condition/Compatibility

RF amplifier (Pit-groove switching, AGC, EQ Gain switching, I-V Amp,

IC1 RF Matrix Amplifier for MD light amount signal output, Peak-hold output, Bottom-hold output, FE output,

TE output, SE output, ADIP dual-value output, Vref output, APC PD amplifier, FZC generation comparator EFM decoding, EFM digital PLL, ACIRC decoding, Automatic LINK processing

IC2 Digital signal processor for MD ADIP decoder, Memory control, Digital servo, (focus, tracking thread, spindle

CLV), 1 bit D/A, ATRAC/ATRAC3 decoding, 4M(1Mx4) DRAM Analog post filter IC3 +2.5V regulator Power supply for 2.5V system of IC2 IC4 5chBTL servo driver Various actuator, Motor drive, Disk loading, Eject motor driver, +3.3V regulatore IC5 low-pass filter 3-times active filter IC6 3.3v regulator D/A audio+B IC7 CMOS buffer 3.3V/5.0V level shift IC8 Mechanism micon Servo control, Memory, control, System control, Various interfaces IC9 E2PROM

Servo coefficient, Servo adjustment data backup memory

Q1 APC IC1, IC2 APC ON and ON while Q2 is OFF Q2 LD SW ON when laser is OFF (when micro com LDON "L") Q3

Detection of disk reflection amount

ON when focus is passed during UP search

Q4 +3.3V regular ON when SW+5V "H" (when Q7 is ON) Q5 A+8V SW ON when Q6 is ON Q6 SW for SW+8V ON when SW+5V "H" (When Q7 is ON) Q7 PON (SW+5V) ON when Pin 11 of IC8 is "L"

●

MD Unit (X33-3120-00)

KMD-44

System µ-com: (X25 : IC1)

●

Terminal Description

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin Name I/O Function Description of Processing

1 TYPE 0 I Destination type input terminal 0 Pull down to GND

2 TYPE 1 I Destination type input terminal 1 Pull down to GND

3~8 N.C. O Not used

9 VDD - VDD connection terminal Connected to BU 5V lines

10 STBY O Power IC standby control output "Hi":POWER ON mode

11 SVR O Power IC reset terminal

When the momentary power down,

after ACC OFF is detected and after

POWER OFF, the output goes"Hi" temporarily.

12 N.C. O Not used

13 P-MUTE O Power IC mute control "Lo":Mute

14 ANT-CON O Antenna control "Hi":during FM/AM reception

15 IC2-SCK O Clock output to the E-VOL. IC

16 N.C. O Not used

17 P-CON O Power control

"Hi":POWER ON mode except ALL OFF mode

18 ACC-DET I ACC detection input "Hi":ACC OFF, "Lo":ACC ON

19 REMO I Data input from the remote control light sensor

20 P-ON O A.8V AVR ON/OFF control terminal

"Hi":POWER ON mode or during MD Loading/Eject

21 BU-DET I Momentary power down detection input

"Hi":When momentary power down

detected or BU OFF, "Lo":BU ON

22 TSET - Not used Connected to GND

23 IC2-SDA I/O Data input/output with the E-VOL. IC

24 MUTE O Mute control output "Hi":Mute ON, "Lo":Mute OFF

25 SW5 O SW 5V control

"Lo":POWER ON mode or during MD Loading/Eject

26 M-CLK I/O

Clock input/output with the MI-COM. of MD mecha.

27 M-DATA I/O

Data input/output with the MI-COM. of MD mecha.

28 IC3-SDA I/O Data input/output with the F/E(tuner)

29 CHCON O Changer control

"Lo":Standby, "Hi":during the movement

30 IC3-SCK O Clock output to the F/E(tuner)

31 REQH O Request output to changers "Lo":Request

32 ILL-ON O Illumination AVR ON/OFF control terminal "Hi":POWER ON mode

33 DSI O DSI output terminal Not used

34, 35 N.C. O Not used

36 MD+B O MD servo +B ON/OFF control terminal

"Hi":MD source is selected or during MD Loading/Eject

37 VDD - VDD connection terminal Connected to BU 5V lines

38 X2 - Main clock resonator connection terminal

39 X1 I Main clock resonator connection terminal

40 VSS - Ground connection terminal Connected to GND

41 XT2 - Sub clock resonator connection terminal

42 XT1 I Sub clock resonator connection terminal

43 RESET I Reset input terminal "Lo":System reset

44 N.C. O Not used

45 R-CLK I Clock input from RDS decoder Not used

46 REQ C I Request input from changers "Hi":Request

47 KEY-REQ I Key request terminal "Lo":Request

48 N.C. O Not used

49 LOS-SW I MD insertion detection terminal "Lo":MD insertion detected

KMD-44

Pin Name I/O Function Description of Processing

50 N.C. O Not used

51 AVDD - VDD connection terminal Connected to BU 5V lines

52 AVREF 0 -

VDD connection terminal

Connected to BU 5V lines

(A/D converter reference voltage input)

53 PHONE I PHONE detection input Not used

54 N.C. I Not used Connected to GND

55 NIOSE I Noise detection input

56 S-METER I S-meter input from the F/E(tuner)

57~59 N.C. I Not used Connected to GND

60 M-MUTE I Mute request from the MI-COM. of MD mecha. "Lo":Mute requested

61 AVSS - Ground connection terminal(A/D, D/A converter) Connected to GND

62 N.C. O Not used

63 M-RST O Reset output to the MI-COM. of MD mecha. "Lo":Reset

64 AVREF 1 -

VDD connection terminal

Connected to BU 5V lines

(D/A converter reference voltage input)

65 DATA C I Data input from changers

66 DATA H O Data output to changers

67 CH-CLK I/O Clock input/output with changers

68 L-DATAL I Data input from the LCD driver IC

69 L-DATAS O Data output to the LCD driver IC

70 L-CLK O Clock output to the LCD driver IC

71 M-STOP O Stop request to the MI-COM. of MD mecha. "Lo":Stop, "Hi":during the movement

72 BEEP O Beep sound output

73~75 N.C. O Not used

76 LOE-SW I

MD loading complete detection SW input terminal

"Lo":MD loading completion

77 EJECT O

MD mecha. Loading/Eject switching output terminal

Standby :(EJECT, LOAD)=(Lo, Lo)

Eject :(EJECT, LOAD)=(Hi, Lo)

78 LOAD O

MD mecha. Loading/Eject switching output terminal

Loading :(EJECT, LOAD)=(Lo, Hi)

Brake :(EJECT, LOAD)=(Hi, Hi)

79 L-INH O INH output to the LCD driver IC "Hi":Active, "Lo":LCD indication OFF

80 L-CE O CE output to the LCD driver IC "Hi":Active

81 PANEL I Panel detaching detection input "Lo":Panel not detached

82, 83 N.C. O Not used

84 QUAL I Quality input from RDS decoder

85 R-DATA I Data input from RDS decoder

86, 87 N.C. O Not used

88 SD I SD input from the F/E(tuner)

"Hi":Station detected, "Lo":Not detected

89~91 N.C. O Not used

92 AFC O Noise detection time constant switching terminal Not used

93~95 N.C. O Not used

96 AM+B O AM+B control "Hi":during AM reception

97 FM+B O FM+B control "Hi":during FM reception

98 ST TYPE 0 I IC2 stereo data setting terminal "Lo":Initial value

99 ST TYPE 1 I IC2 stereo data setting terminal "Lo":Initial value

100 VSS - Ground connection terminal Connected to GND

MICROCOMPUTER'S TERMINAL DESCRIPTION

KMD-44

ADJUSTMENT

TEST MODE

1. To enter test mode

While holding the "FM" key and preset "6" key, reset the unit. All indication segments are ON at the beginning of test mode.

2. To relese test mode

Simply reset the unit. (NOTE) The test mode is not canceled by ACC OFF, power OFF, momentary power down.

3. MD receiver test mode specification

Pressing the "Track Up" key jumps between tracks in the following order. No.7 / No.2 / No.13 / No.23 / No.30 / No.34 / No.7 (Same as the beginning) Pressing the "Track Down" key jumps to the previous track to the being played. Pressing the preset "1" key jumps to No.28 track. Again pressing the preset "1" key jumps to No.22 track.

4. Audio adjustment

The volume is set to -10dB (which is shown as

30). Loudness is OFF. CRSC becomes OFF regardless of the functional excuse, too. The BASS/TREBLE and BALANCE/FADER controls can be set to the full boost/full cut and full front/full rear and full right/full left respectively by pressing the "Track Up" / "Track Down" keys. Sound coordination (system Q) doesn't appear for the Audio mode feed.

MDS-2500 Service Test Mode (Manual Adjustment Mode)

In order to adjust the focus bias (balance) of MDS-2500, automatic adjustment is conducted at factory and bias value is written on the E2PROM. When conducting adjustment on the set, the data in the E2PROM is read. Therefore, when changing the pickup for servicing, it is necessary to conduct focus bias adjustment again. If you are equipped with MDS-2000 AT3 Commander and jitter meter, it is possible to use automatic adjustment. We have prepared the service test mode (manual adjustment mode) in case MDS-2000 AT3 Commander and jitter meter are not available.

● Adjustment Procedure

(Note: During the adjustment procedure, be sure to turn off the power supply to the set.)

1. Pull up the IC11 50pin (LADJ1 (Check Land L1)) of the X33 Unit to BU5V (Check Land BU 5).

2. Pull out the Check Land ARF of X33 Unit and Check Land SAG (Servo GND) using wires so these can be monitored with an oscilloscope.

3. Turn the power on the set while resetting the set.

* Adjustment should be conducted on total of three places: low-reflection pit and groove of the recordable disk and high-reflection pit of the pre-mastered disk.

4. When the disk is loaded, the set enters the adjustment mode.

● For Recordable Disk

5. With the "TNo. 1" display, low-reflection pit beta play mode is entered. The display section of the time code shows "50."

6. While monitoring ARF with an oscilloscope, vary the focus bias with track up and track down key.

7. In order to calculate the optimum values, vary UP's and DOWN's and change the values at which the ARF waves are disturbed or 3T waveform levels goes down and calculate the center values for these. For example, if values are 58 for the UPside and 46 for the DOWN-side, the center value 52 would be the optimum value.

8. After obtaining the optimum value, set it to the value and press manual UP/DOWN key, which will confirm the value. (Normally, setting will be made by pressing on the track UP/DOWN key.)

9. After adjusting the low-reflection pit in 8, the pickup is automatically sent to the groove area.

10. With the "TNo. 2" display, the groove beta

play mode is entered.

11. From this point on, it is the same as the

above 6, 7, and 8.

12. After adjustment on the groove area, the

set stops. Eject the disk and the adjustment is complete.

∗ Since there is only TOC area for low-

reflection pit, the play time is about 40 seconds. After the pit area, the set will enter retry movement, during which adjustments are not effective.

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