Kenwood KMD-671R User Manual

MD RECEIVER

KMD-671R

SERVICE MANUAL

B51-7580-00(S) 2209

● This service manual does not include information on the MD mechanism assembly (explodedview, parts list, schematic diagram or mechanism description). For such information, refer to the MD mechanism assembly manual (X92-3390-00,0-01,X92-3560-00, X92-3580-00:B51-7461-00).

Front glass

(B10-3117-01)

LOUD

ATT

Plastic cabinet assy

(A02-1486-13)

Escutcheon

(B07-2181-02)

MD RECEIVER CD·MD-CHANGER CONTROL

SCAN

RDM REP

Mounting hardware assy

(J21-9491-03)

45Wx4

D.SCAN M.RDM

DC cord

(E30-4790-05) : E type only

Panel assy (A64-1881-02)

KMD-671R

AUD

VOL ADJ

CLK

Remote controller assy

(A70-0883-05): M type only

PWR OFF

PTY L

NAME.S

SRC

DISC

Lever

(D10-3031-04) x2

Stay (J54-0606-04) : M type only

Screw set (N99-1610-15) : M type only

Screw set

(N99-1632-05) : M type only

DC cord

(E30-4785-05) : M type only

SIZE AAA Battery

Not supplied as service parts

Antenna adaptor

(T90-0523-05) : E type only

KMD-671R

A8V

SW5V

BACK

and

E-VOL

MPX

VDD

QUAL

LEVEL

MP IN

IC2

Q21,22

MUTE

MUTE DRIVER

Q19,20

IC8,

Q23

200mV

170mV

1200mV

BUFF

Q29

FM+B

AM+B

Q27,28

TUN5V

AUDIO OUT

VDD 5V

IF1/IF2/PLL+B

AM+B

FM+B

S-METER

ANT

S 5.0V

A8V

BU5V

LOAD

LOE SW

LOS SW

EJECT

M STOP

M RST

M MUTE

M DATA

M CLK

BU5V

R CLK

R DATA

QUAL

NOISE

AFC

S-METER

AMP

NOISERDS

DECODER

IC10

u-COM

IC1

IC7,Q33

RST

L DATAS

L CLK

L DATAL

REMO

PANEL

Q24

BU5V

PAN 5V SW

PANEL

IC2

PAN 5V

RST SW

(X13)

IC1

REMOTE

CONTROL

WITH

LCD DRIVER

KEY MATRIX

LCD

ILL. SW

SW5V

PAN 5V

MD SERVO

AVR

IC6

A.8V AVR

IC3,Q5

A.8V AVR

ON/OFF

Q3,4

ILLUMI AVR

Q7-9

KMD-671R(M,E)

P-CON

BACK UP

BU5V

SW5V BU5V

Q1,2

P-CON

Q13-16

SP-OUT

TEL-MUTE

ACC

PROTECTION

THERMAL

POWER IC

SVR SW

3529mV

773mV

1258mV

CD-CH

3529mV

PRE OUT

IC4

MUTE

SDA

SCL

PHONE

TEL-MUTE

Q18

ACC DET.

SVR

BU DET.

DSI

Q10

Q17

BU DET.

Q34

DSI

SDA

SCL

Q30-32

S MUTE

MP OUT

RST

DATA C

REQ H

CH-CON

DATA H

REQ C

CLK

MUTE

L INH

L CE

SERVO AVR

ON/OFF SW

S 5.0V

A8V

P-ANT

SW5V

BU5V

VLCD AVR

Q2,3

KMD-671R(E)

Q25,26

TUNER

SCL SDA

CONTENTS

BLOCK DIAGRAM .............................................................. 2

COMPONENT DESCRIPTION ........................................... 3

MICROCOMPUTER’S DESCRIPTION............................... 4

ADJUSTMENT .................................................................... 6

PC BOARD ......................................................................... 7

BLOCK DIAGRAM

SCHEMATIC DIAGRAM ................................................... 11

EXPLODED VIEW ............................................................ 17

PARTS LIST...................................................................... 18

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

KMD-671R

COMPONENT DESCRIPTION

● SWITCH UNIT(X13-9702-71)

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

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

Q1 DTA114EKorUN2111 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 2SC2412Kor2SD601A LCD AVR

● ELECTRIC UNIT(X25-845X-XX)

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

IC1 UPD784216GF520 System MI-COM. IC2 TDA7400D E-VOL. & N.C. MPX IC3 M5237ML AVR IC IC is combined with Q5, and it works as the error

detection, the driver. IC4 TDA7386 Power IC IC6 LM2595S-5.0 MD SERVO AVR Output voltage 5.0V fixation. A DC/DC Converter with

the ON/OFF function. IC7 PST9130NR Reset IC “L”:detection voltage below 3.0V IC8 HD74HC27FP Mute logic 3 input NOR gate x3

IC10 TDA7479D RDS decoder

Q1 2SC4081or2SD1819A BU 5V AVR Inverted darlington connection Q2 2SB1565F(E,F) On during BU applied. Q3 DTA124EUAorUN5112 Audio 8V AVR ON/OFF SW Audio 8V AVR ON/OFF control Q4

DTC144EKorUN2213orKRC104S Q5 2SB1565F(E,F) Audio 8V AVR Output voltage 8.3V Q6

DTC144EKorUN2213orKRC104S Q7 DTC144EUAorUN5213 Illmination AVR AVR output is ON when Q7’s base goes “Hi”. Q8 DTA124EUAorUN5112 Q9 2SD1760

Q10 2SA1036K SW 5V ON when the base goes “Lo”. Q13 2SB1277(Q,R) P-CON SW Q13 is turned ON when Q16’s base goes “Hi”. Q16 Q14 2SA1037K P-CON protection Protect Q13 by turning ON when P-CON output is

Q15

Q17 2SC2412Kor2SD601A

Q18 2SC2412Kor2SD601A ACC detection ON when the base goes “Hi” during ACC applied. Q19 Q20 Q21 DTC143TKorUN2216 Audio mute SW Audio pre-outs are muted when the base goes “Hi”. Q22 DTC143TKorUN2216 Q23 Q24 2SA1576A Panel detection SW ON when the base goes “Lo” during the panel closed. Q25 Q26 2SB1277(Q,R) ON during FM reception Q27 Q28 2SB1277(Q,R) ON during AM reception Q29 2SC4081or2SD1819A Q30 2SC4081or2SD1819A Noise buffer Q31 DTC114TKorUN2215 AFC time constant SW OFF during FM seek, ON during FM reception Q32 Q33

Q34 2SC4081or2SD1819A DSI driver ON when the base goes “Hi”.

DTC114YKorUN2214orKRC107S

DTA124EKorUN2112orKRA103S

DTC144EKorUN2213orKRC104S

DTC114YKorUN2214orKRC107S

DTC124EKorUN2212orKRC103S

DTA124EKorUN2112orKRA103S

DTC144EKorUN2213orKRC104S

MD SERVO AVR ON/OFF SW

BU detection(Momentary power down detection)

Mute driver for Audio mute SW E-VOL. mute SW E-VOL. is muted when the base goes “Hi”.

SVR SW

FM+B SW Q26 is turned ON when Q25’s base goes “Hi”.

AM+B SW Q28 is turned ON when Q27’s base goes “Hi”.

Composite signal output buffer

RESET SW System RESET is activated when the panel reset SW

Q3 is turned ON when Q4’s base goes “Hi”.

AVR IC is activated when Q6’s base goes “Hi”.

grounded. Prevents Q14 tuning ON during start-up after power ON. ON when the base goes “Hi” during BU applied.

ON when the base goes “Lo”.

POWER IC RESET is activated when the base goes “Hi”.

Q31 is turned OFF when Q32’s emitter goes “Lo”.

is pushed.

KMD-671R

MICROCOMPUTER'S DESCRIPTION

System µ-com : UPD784216GF520

● Terminal Description

Pin No.

Pin Name I/O Description Processing Operation

1 TYPE 0 I Destination type input terminal 0 Pull up to BU 5V lines 2 TYPE 1 I Destination type input terminal 1 Pull down to GND 3 N.C. O Not used 4 N.C. O Not used 5 N.C. O Not used 6 N.C. O Not used 7 N.C. O Not used 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

12 N.C. O Not used 13

P-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 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/

BU-DET 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 26 M-CLK I/O

27 M-DATA I/O 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

REQ H 32 ILL-ON O Illumination AVR ON/OFF control terminal “Hi”: POWER ON mode 33 DSI O DSI output terminal “Hi”: DSI LED ON 34 N.C. O Not used 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/

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 44 N.C. O Not used 45 R-CLK I Clock input from RDS decoder 46

REQ C 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

O Power IC mute control “Lo”: Mute

I ACC detection input “Hi”: ACC OFF, “Lo”: ACC ON

I Momentary power down detection input “Hi”: When momentary power down detected or

O SW 5V control “Lo”: POWER ON mode or during MD Loading/

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

O Request output to changers “Lo”: Request

I Reset input terminal “Lo”: System reset

I Request input from changers “Hi”: Request

is detected and after POWER OFF, the output goes “Hi” temporarily.

Eject

BU OFF, “Lo”: BU ON

Eject

KMD-671R

MICROCOMPUTER'S DESCRIPTION

Pin No.

Pin Name I/O Description Processing Operation

50 N.C. O Not used 51 AVDD - VDD connection terminal Connected to BU 5V lines 52 AVREF 0 -

53 PHONE I PHONE detection input 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 N.C. I Not used Connected to GND 58 N.C. I Not used Connected to GND 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 -

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 N.C. O Not used 74 N.C. O Not used 75 N.C. O Not used 76 LOE-SW I 77 EJECT O

78 LOAD O

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 82 N.C. O Not used 83 N.C. O Not used 84 QUAL I Quality input from RDS decoder 85 R-DATA I Data input from RDS decoder 86 N.C. O Not used 87 N.C. O Not used 88 SD I SD input from the F/E(tuner) “Hi”: Station detected, “Lo”: Not detected 89 N.C. O Not used 90 N.C. O Not used 91 N.C. O Not used 92

AFC 93 N.C. O Not used 94 N.C. O Not used 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

VDD connection terminal(A/D converter reference voltage input)

VDD connection terminal(D/A converter reference voltage input)

MD loading complete detection SW input terminal MD mecha. Loading/Eject switching output terminal

MD mecha. Loading/Eject switching output terminal

I Panel detaching detection input “Lo”: Panel not detached

O Noise detection time constant switching terminal “Lo”: During FM seek, “Hi”: During FM reception

Connected to BU 5V lines

1V or less: TEL MUTE, 2.5V or greater: NAVI MUTE

Connected to BU 5V lines

“Lo”: MD loading completion Standby : (EJECT, LOAD)=(Lo, Lo) Eject : (EJECT, Loading : (EJECT, LOAD)=(Lo, Hi) Brake : (EJECT,

LOAD)=(Hi, Lo)

LOAD)=(Hi, Hi)

KMD-671R

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 release 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(Kex / ec4 / dB) doesn't appear for the Audio mode feed.

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