Kenwood RXDM-51 Service manual

MICRO HiFi COMPONENT SYSTEM

MD 6

TUNER

micro hi-fi component systemAuto Reverse

AUX

push

OPEN

MD rec

DISC LOADING MECHANISM

TAPE/preset

band

1BIT DUAL D/A CONVERTER

TAPE rec

remote

TAPE

direction

set/demo

menu

repeat

sound

standby/timer

on/standby

3

d

o

w

n

u

p

2

V

O

L

U

M

E

/

m

u

l

t

i

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phones

CD 6

74

1¡

¢

0

0

2 3

RXD-M51/M51MD

SERVICE MANUAL

(HM-531/581MD)

© 1998-9/B51-5477-00 (K/K) 2138

Dressing panel
(A21-3707-03)

Knob
(K29-7392-02)

Dressing panel
(A21-3721-03)

Panel (MD)
(A29-1022-04)

Front glass
(B10-3418-03)

Panel
(A60-1496-11)

Knob
(K29-7393-03)

Knob
(K29-6358-14)

Indicator
(B12-0351-03)

Knob
(K29-7394-03)

Front glass
(B10-3419-14)

• Refer to DM-3090 service manual(B51-5396-00), if
require the following items in detail.

1) MD mechanism(MDM-98A) disassembly for repair
(page5,6)

2) Semiconductor description
IC1101:RF signal control(page9)
IC1201:ENDEC/ATRAC(page10,11)
IC1401:system microcomputer(page 12,13)

Miniature phone jack
(E11-0344-05)

Illustration is RXD-M51MD.

* Refer to parts list on page 49.

Caution : No connection of ground line if disassemble the

KENWOOD-Crop. certifies this equipment conforms to DHHS
Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.

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

unit.
Please connect the ground line on rear panel,
PCBs, Chassis and some others.

SYSTEM MAIN UNIT DESTINATION SPEAKER SP CORD PARTS.NO.
HM-581MD RXD-M51MD E1T1 LS-M61 E30-5500-05
HM-531 RXD-M51 M1E2T2 LS-M51 E30-5500-05

Operation to reset

The microcomputer may fall into malfunction (impossibil­ity to operate, erroneous display, etc.) when the power
cord is unplugged while unit is ON or due to an external
factor. In this case, execute the following procedure to
reset the microcomputer and return it to normal condi­tion.

Unplug the power cord from the power outlet then, while
holding the “set/demo” key depressed, plug the power
cord again.

÷ Please note that resetting the microcomputer clears the

contents stored in and it returns to condition when it left
the factory.

Batteries (R6/AA) (2)

Other countries

Remote control unit (1)

AM loop antenna stand (1)

Speaker cords (2)

Loop antenna (1) (T90-0833-05)

Please confirm that the following accessories are present.

FM indoor antenna (1)

Europe U.K. and Russia

AC plug adapter (1)

Use to adapt the plug on the power
cord to the shape of the wall outlet.
(Accessory only for regions where
use is necessary.

(T90-0810-05): TE

(E03-0115-05)

(E30-5500-05)

(A70-1236-05) : RC-M0503E

Remote control unit (1)
(A70-1242-05) : RC-F0503E

Remote control unit (1)
(A70-1241-05) : RC-F0503

(T90-0801-05): M

(J19-3645-05))

¢

REMOTE CONTROL UNIT

RC-F0503E

SLEEP TONE SOUND

1 2 3 TIMER

4 5 6 REPEAT

7 8 9

RANDOM

+10 0 PGM CLEAR

DOT DISP.TIME DISP.

TAPE

P.CALL

TAPE

TUNER

BAND

CD

PTY

TA/NEWS

AUX

SET ENTER MUTE

¡4

2 3 7

%

fi

6

1

POWER

VOLUME

O.T.E.

TRACK

EDIT

TITLE

INPUT

TITLE

SEARCH

TIMER

RANDOM

CLEAR

DELETE

REPEAT

6

CD

6

TUNER

BAND

SET

DOT/CHARA.

TIME ENTER

SLEEP

1 2 3

4 5 6

7 8 9

+10 0

DOLBY NR

QUICK

MOVE

TAPE

PTY

TA/NEWS

AUX

¢

P.CALL

4

2 3

PGM

¡1

REMOTE CONTROL UNIT

RC-M0503E

SOUNDTONEMDTAPE

MD

7

%

fi

MUTE

V

O

L

U

M

E

C

O

N

T

R

O

L

DISPLAY

O.T.E.

POWER

¢

REMOTE CONTROL UNIT

RC-F0503

SLEEP TONE SOUND

1 2 3 TIMER

4 5 6 REPEAT

7 8 9

RANDOM

+10 0 PGM CLEAR

DOT DISP.TIME DISP.

TAPE

P.CALL

TAPE

TUNER

BAND

CD

AUX

SET ENTER MUTE

¡4

2 3 7

%

fi

6

1

POWER

VOLUME

O.T.E.

RXD-M51/M51MD

CONTENTS / ACCESSORIES / CAUTION

Contents

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

EXTERNAL VIEW/DISASSEMBLY FOR REPAIR.......3

BLOCK DIAGRAM.......................................................4

CIRCUIT DESCRIPTION.............................................5

ADJUSTMENT.......................................................... 11

WIRING DIAGRAM....................................................12

Accessories

PC BOARD ................................................................13

SCHEMATIC DIAGRAM............................................23

EXPLODED VIEW .....................................................45

PARTS LIST...............................................................49

SPECIFICATIONS.....................................................59

System configuration

Caution

2

set/demo

1

2

3

EXTERNAL VIEW / DISASSEMBLY FOR REPAIR

EXTERNAL VIEW

Lock terminal board
(E70-0052-05)

Phono jack
(E63-1024-05)

RXD-M51/M51MD

Lock terminal board
(E70-0053-05)

DISASSEMBLY FOR REPAIR

Power cord bushing
(J42-0083-05)

AC power cord *
(E30-)

Illustration is RXD-M51MD.

* Refer to parts list on page 49.

< How to check the PCB >

See the left figure, connect the SP terminal GND and the rear
panel (1), the front panel GND and the rear panel (2), MD

mecha chassis and the rear panel (3) (except RXD-M51) with
the wires connected alligator chips.

3

4

(X33)

(X14)

ONLY

(X09)

A301 (W02-)

(X14)

ONLY

E,T TYPE

(X33)

(X07)

RXD-M51MD

RXD-M51

RXD-M51
ONLY

RXD-M51MD

200mV/47k

AUX IN

AUX IN

ATT

3dB

FM
AM

ANT

TUNER PACK

ERASE

R/P

BIAS TRAP

MPX

OSC

BIAS

Q11,12

IC1

IC2

IC3

FE-BIAS

VR201

(RF-AMP)

CXA1571M

IC203

CXD2587Q
(DSP/DAC/CD-TEXT)

IC201

(4ch BTL-DRIVER)

BA5979S

IC202

MECHA.

CD

DIGITAL OUT

UPD7805BGC-A59
MD MECHA.

IC1

DIGITAL IN

(LEVEL SHIFT)

TC74HCT7007AF

RDS

(MAIN u-COM)

IC205

IC206

REMOTE FL

FL
DRIVER

(A/D)

KEY

ENCODER

ROTARY

C0NTROL

LED

MID
TREBLE

BASS

EX. BASS
LOUD

J1

HEADPHONES

AMP

POWER

D1

38V

AVR

D2

+12V
AVR

+8V
AVR

D3

P. T.

T1

+5.6V
AVR

D16-21

DECK MECHA

DECK ANALOG

TUNER

AUDIO

CD BTL-DRIVER

MD ANALOG

MD MECHA. DIGITAL

CD DSP. RF-AMP

FL DRIVER DISPLAY

MD u-COM

MAIN u-COM

IC1

S1 Q1-6

IC2

A1

IC3

MD MECHA.
MDM-98A

IC5

IC4

Q3,4

Q5-16

PROTECTION
CIRCUIT

Q17-21

FL

Q32,35

Q27-29

Q30,31

+5V
AVR

Q208

Q205

+5V
AVR

Q7,8

AVR

+6.5V/5V

Q9

AVR

+6V

+5V
AVR

Q201,202

FL FILAMENT

AC4.5V

K1

POWER
RELAY

Q33

AC IN

DIGITAL OUT

A201

DECK

SP. OUTPUT

M,E,T 12.25V/6 (10%)

POWER RELAY

J1

CONTROL u-COM

L3,4

SPEAKERS

D5

ED1

MECHA.

DECK

425mV

FE
TE
SI
RF

FFDR
FRDR
TFDR
TRDR
SFDR
SRDR
MDP

Rch-OUT

Lch-OUT

PB AMP

REC AMP

DOLBY B

OUT 580mV

IN

R/P (REC=H)

DOUT

RESET

(FCS.TRK.SLD.SFD-DRIVE)

DSCK
RESET

PDOWN

MD-ST

SERCH

KDATA

U.T.D

U.K.D

X1

X1

X2

DSTB

MDDATA

LOAD SW

MD R.D
MD T.D

+

+

+

+

+

5.0V

3.3V

1.2V1.8V

+3dB

MUTE

200mV

DOLBY

DECK

TUNER

AUX

CD
MD

850mV

+12V

(5MHz)

850mV

RXD-M51/M51MD

BLOCK DIAGRAM

1. Initialization

1-1 Setting of initial conditions

While pressing the [SET] key, plug the AC power cord

into an AC power outlet.

1-2 Initializing operation

• A microcomputer is initialized for start when the AC
power is turned on while pressing the [SET] key. At
that time, CD mechanism, MD mechanism and CAS­SETTE mechanism are also initialized.

• During the initial operation, the display shows “INITIAL­IZE” and after that the clock blinks up on display.

1-3 Initial items and back up data

1-4 Mechanism initialization

1-4-1 CD mechanism

• If a mechanism error occurs, “C” is indicated on the
display.

1-4-2 MD mechanism

• The MD ON code is input within 4 seconds after turned
the power port on, the MD initial code (D122H) is out­put.
If the MD on code is not input, the error indication is
displayed as "M" on the display.

1-4-3 CASSETTE mechanism

• If a mechanism error occurs, "X" is indicated on the dis­play.

ch

Destination

K2 E2 E1/H

1 FM 97.50MHz FM 97.50MHz FM 97.50MHz
2 FM 108.00MHz FM 108.00MHz FM 108.00MHz
3 AM 630kHz AM 630kHz AM 630kHz
4 AM 1000kHz AM 999kHz AM 999kHz
5 AM 1440kHz AM 1440kHz AM 1440kHz
6 AM 1610kHz AM 1602kHz AM 1602kHz
7 FM 87.50MHz FM 87.50MHz FM 87.50MHz
8 FM 87.50MHz FM 87.50MHz FM 87.50MHz

9 FM 87.50MHz FM 87.50MHz FM 87.50MHz
10 FM 89.10MHz FM 89.10MHz FM 89.10MHz
11 FM 87.50MHz FM 87.50MHz FM 87.50MHz
12 FM 90.00MHz FM 90.00MHz FM 90.00MHz
13 FM 106.00MHz FM 106.00MHz FM 106.00MHz
14 AM 530kHz AM 531kHz AM 531kHz
15 FM 87.50MHz FM 87.50MHz FM 87.50MHz
16 FM 98.00MHz FM 98.00MHz FM 98.00MHz
17 FM 98.50MHz FM 98.50MHz FM 98.50MHz
18 FM 87.50MHz FM 87.50MHz FM 87.50MHz
19 AM 990kHz AM 990kHz AM 990kHz
20 FM 97.40MHz FM 97.40MHz FM 97.40MHz
21 FM 87.50MHz FM 87.50MHz FM 87.50MHz
22 FM 87.50MHz FM 87.50MHz FM 87.50MHz
23 FM 87.50MHz FM 87.50MHz FM 87.50MHz
24 FM 87.50MHz FM 87.50MHz FM 87.50MHz
25 FM 87.50MHz FM 87.50MHz FM 87.50MHz
26 FM 87.50MHz FM 87.50MHz FM 87.50MHz
27 FM 87.50MHz FM 87.50MHz FM 87.50MHz
28 FM 87.50MHz FM 87.50MHz FM 87.50MHz
29 FM 87.50MHz FM 87.50MHz FM 87.50MHz
30 FM 87.50MHz FM 87.50MHz FM 87.50MHz
31 FM 87.50MHz FM 87.50MHz FM 87.50MHz
32 FM 87.50MHz FM 87.50MHz FM 87.50MHz
33 FM 87.50MHz FM 87.50MHz FM 87.50MHz
34 FM 87.50MHz FM 87.50MHz FM 87.50MHz
35 FM 87.50MHz FM 87.50MHz FM 87.50MHz
36 FM 87.50MHz FM 87.50MHz FM 87.50MHz
37 FM 87.50MHz FM 87.50MHz FM 87.50MHz
38 FM 87.50MHz FM 87.50MHz FML 74.00MHz
39 FM 87.50MHz FM 87.50MHz FML 65.00MHz
40 FM 87.50MHz FM 87.50MHz FML 69.00MHz

2. TUNER preset frequency

ITEMS

POWER OFF
VOLUME 15
BALANCE CENTER
LOUDNESS OFF

AMP EX. BASS ON

INPUT SEL TUNER
AUX INPUT 0 (-6dB)
BASS 0
TREBLE 0
BAND FM
LAST f LIMIT

TUNER LAST Pch

AUTO/MONO AUTO
Pch TEST f
CLOCK AM 12 : 00
PROG ON AM 12 : 00

CLOCK PROG OFF AM 12 : 00

TIMER PRO MODE PLAY

SOURCE TUNER
Pch 1
EXE OFF

OTT OFF
SLEEP OFF
PLAY MODE TRACK
REPEAT OFF

CD RANDOM OFF

PLAY MODE STOP
TIME SINGLE

DIRECTION FORWARD

DECK RVS MODE p

DOLBY NR OFF
OPERATION MODE STOP

back up data

4. Main microprocessor M30622MA-174FP (X09 : IC205)

4-1 Microprocessor periphery block diagram

4-2 Key matrix

Vref = 5V ( ) of KEY : RXD-M51

Desti-

U-COM Discrimination

Receiving frequency Channel PORT

nation

Desti-

DSW4 DSW3 DSW2

Band range space

IF RF

92

nation

K, P K1 0 0 0

FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 0

AM 530kHz~1700kHz 10kHz +450kHz 10kHz 0

M, Y K2 0 1 1

FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 1

AM 530kHz~1610kHz 10kHz +450kHz 10kHz 0

JJ00

FM 76.0MHz~108.0MHz 100kHz -10.7MHz 25kHz 0

AM 531kHz~1629kHz 9kHz +450kHz 9kHz 0

Q

FMH 87.5MHz~108.0MHz 50kHz +10.7MHz 10kHz 0

Q

RDS

1 0 FML 65.0MHz~74.0MHz 10kHz +10.7MHz 10kHz 0

AM 531kHz~1602kHz 9kHz +450kHz 9kHz 0

E, T

E1

110

FM 87.5MHz~108.0MHz 50kHz +10.7MHz 25kHz 0

RDS AM 531kHz~1602kHz 9kHz +450kHz 9kHz 0

3. Destination list of TUNER

(DSW4=50pin, DSW3=49pin, DSW2=48pin)

0=(input low) 1=(input high)

GC-E6003

X09,

IC203

X14, IC1

X14

Q1~6

X09
IC4

X09
IC1

X09, IC2

X09

A301

X09

IC206

E TYPE
ONLY

X09

IC205

CD mechanism

Mechanism
control
circuit

Mechanism
control
circuit

Auto reverse
cassette
mechanism

Head amp

Dolby B

CXD2587Q

CD-DSP

TUNER

PLL IC
LC72131M

AUDIO

AMP SYSTEM IC
(LC75396)

MD

MDM-98A

LED

X14 ED1

FL
CM1740M

Key matrix
encoder
remocon

RDS

demodu­lator

DOT driver
LC75710NED

LED driver

M30622MA-174FP

u-COM

VOLTAGE

[V]

CIRCUIT DESCRIPTION

RXD-M51/M51MD

5

6

Pin No. Name I/O Description

1 CE O SYSTEM IC(LC75396)/PLL IC(LC72131) CE
2 PLL DO I PLL DATA INPUT
3 SD I TUNER SD DETECT INPUT H : NO TUNED L : TUNED
4 STEREO I TUNER STEREO DETECT INPUT H : MONO L : STEREO
5 EMPHASIS O TUNER EMPHASIS CHANGEOVER H : FM100kHz L : AM 50kHz
6 RDS DATA I RDS DATA INPUT H : 1 L : 0
7 CE I AC OFF DETECT INPUT H : AC ON L : AC OFF
8 BYTE I CONNECT GND

9 CNVSS I CONNECT GND
10 XCIN I TIMMER CLOCK(32.768kHz)
11 XCOUT O TIMMER CLOCK(32.768kHz)
12 RESET I U-COM RESET H : NORMAL L : RESET
13 XOUT O MAIN CLOCK
14 VSS – GND
15 XIN I MAIN CLOCK
16 VCC – 5V POWER SUPPLY
17 NMI I CONNECT 5V
18 REMOCON I REMOCON INPUT INTERRUPT BY H L
19 RDX CLK I RDS CLK INPUT INTERRUPT BY L H
20 SCOR I SUB CODE SYNCHRO SIGNAL INTERRUPT BY H L (CXD2587Q)
21 CD DC OFF O CD DSP POWER SUPPLY CONTROL H : OFF L : ON
22 SCLK O CD SENSE DATD READ OUT CLOCK (CXD2587Q)
23 SENSE I CD SENSE INPUT (CXD2587Q) H : 1 L : 0
24 CD CLK O CD DSP LOCK (CXD2587Q)
25 XLAT O CD DSP LATCH OUTPUT (CXD2587Q) L : LATCH
26 CD DATA O CD DSP DATA OUTPUT (CXD2587Q) H : 1 L : 0
27 CD RST O CD DSP RESET OUTPUT (CXD2587Q) H : NORMAL L : RESET
28 SQCK O CD SUB CODE CLOCK (CXD2587Q)
29 SUBQ I CD SUB CODE INPUT (CXD2587Q)
30 NC O NO USED
31 FL DATA O FL DRIVER DATA OUTPUT (LC75710NE)
32 NC O NO USED
33 FL CLK O FL DRIVER CLOCK (LC75710NE)
34 CD MUTE I CD MUTE INPUT (CXD2587Q)
35 MD TXD O TRANSMISSION DATA OUTPUT TO MD (UART)
36 MD RXD I DATA INPUT FROM MD (UART)
37 LCD O CD LASER OUTPUT CONTROL H : OFF L : ON
38 NC O NO USED
39 MD RST O MD RESET OUTPUT H : NORMAL L : RESET
40 CD MON O CD MON OUTPUT H : ON L : OFF
41 NC O NO USED
42 MDP SHORT O SAME CD POWER SIGNAL H : OFF L : ON
43 DOOR OPEN I CD DOOR SWITCH INPUT H : OPEN L : CLOSE

44,45 NC O NO USED

46 DSW0 I DESTINATION DISTINCTION (MODEL) H : RXD-M51 L : RXD-M51MD
47 DSW1 I DESTINATION DISTINCTION (DOLBY) H : NO DOLBY L : DOLBY NR

48-50 DSW2-DSW4 I DESTINATION DISTINCTION (TUNER)

51 FL RST O FL DRIVER RESET OUTPUT (LC75710NE) H : NORMAL L : RESET

4-3 Pin description of main microprocessor: M30622MA-159FP

Pin No. Name I/O Description

52 MD CE O MD CE CONTROL L : CE
53 ENC1 I ROTARY ENCODER1 (VOL. INPUT A)
54 ENC2 I ROTARY ENCODER2 (VOL. INPUT B)
55 LED5 O LED OUTPUT D2 SELECTOR MD /TUNER H : ON L : OFF
56 LED4 O LED OUTPUT D1 SELECTOR CD H : ON L : OFF
57 LED3 O LED OUTPUT D5(RED) TIMER H : OFF L : ON
58 LED2 O LED OUTPUT D5(GRN) STANDBY H : OFF L : ON
59 LED1 O LED OUTPUT D3 TAPE DIRECTION(FWD) H : ON L : OFF
60 LED0 O LED OUTPUT D4 TAPE DIRECTION(RVS) H : ON L : OFF
61 FL CE O FL DRIVER CE OUTPUT (LC75710NE)
62 VCC – POWER SUPPLY
63 NC O NO USED
64 VSS – GND

65 A/B-2 O DECK ACTIVITY CHOICE MODE (HA12219NT)

66 A/B-1 O DECK ACTIVITY CHOICE MODE (HA12219NT)
67 CPM O DECK MOTOR CONTROL H : ON L : OFF

68 SOL O DECK SOLENOID CONTROL H : ON L : OFF
69 REC F SW I DECK FEW REC SW INPUT H : OFF L : ON
70 REC R SW I DECK RVS REC SW INPUT H : OFF L : ON
71 PACK SW I DECK PACK SW INPUT H : OFF L : ON
72 Cr02 SW I DECK CrO2 DETECT SW INPUT H : CrO2 L : NORMAL
73 PLAY SW I DECK PLAY SW INPUT H : OFF L : ON
74 B1/2 O DECK ACTIVITY CHOICE MODE (HA12219NT) H : B2 L : B1
75 A120/70 O DECK ACTIVITY CHOICE MODE (HA12219NT) H : 70U L : 120U
76 BIAS O DECK BIAS CONTROL H : ON L : OFF
77 NOR O DECK NORMAL (HA12219NT) H : NORMAL L : CrO2
78 REC/PLAY O DECK REC/PLAY CHANGEOVER H : REC L : PLAY
79 DOLBY/NR O DECK DOLBY CONTROL H : ON L : OFF
80 CLK O CLOCK OUTPUT TO SYSTEM IC/PLL IC
81 MD PROTECT I MD PROTECTION L : PROTECT
82 FAN H/L O FAN SPEED CONTROL H : LOW L : HI
83 FAN ON/OFF O FAN ON/OFF CONTROL H : OFF L : ON
84 A MUTE O AUDIO MUTE CONTROL H : OFF L : ON
85 CD A MUTE O CD ANALOG MUTE CONTROL H : ON L : OFF
86 TUNER MUTE O TUNER MUTE CONTROL H : ON L : OFF
87 POWER O POWER RELAY CONTROL H : ON L : OFF
88 PROTECT I PROTECTION DETECT H : PROTECT

89-91 KEY1-KEY3 I KEY A/D INPUT1-3
92,93 AD PROTECT2,1 I PROTECTION DETECT INPUT2,1 0.5V : PROTECT

94 MECHA MUTE O DECK MECHA MUTE OUTPUT H : ON L : OFF
95 RDS SLEVEL I RDS S-LEVEL INPUT (E,T type)
96 AVSS – GND
97 PHOTO I DECK ROTARY DETECT INPUT
98 VREF – 5V REFERENCE VOLTAGE ( NO BACKUP)
99 AVCC – 5V POWER SUPPLY ( BACKUP)

100 DATA O DATA OUTPUT TO SYSTEM IC/PLL IC

65 66

H H REC
H L REC PAUSE,ARM
L L PLAY

RXD-M51/M51MD

CIRCUIT DESCRIPTION

Back up power
supply (+5V)

X09, IC205

X33, IC1

MAIN u-COM

M30622MA-174FP

ENG_KANA

MD_MUTE

MUTE AND OR
(MAIN u-COM)

back up sw

MD SUPPLY VOLTAGE
CHANGE-OVER
TERMINAL

MD_RESET

MD-ST

SEARCH

LOAD_IN

DSCK

K_DATA

DSTB
MD_DATA

uart
rxd
txd

digital in
analog L/R in

analog L/R out

AD / DA
CONVERTER

MD
CONTROL
u-COM

DRIVE
UNIT

MD u-DOM

RF AMP

ENDEC / ATRAC

MD mecha. unit (MDM-98A)

2

22

2

2

1

3

1

uPD78058GC-B20

• DISPLAY CONTROL

• RF AMP CONTROL

• SIGNAL PROCESSING IC
CONTROL (TUNER)

• VOLUME, MUTE CONTROL

• INPUT SELECTOR CONTROL

back up voltage detection

5. Composition (MD section)

5-1 Microprocessor periphery block diagram

Pin No Name I/O Description

1 PDOWN O MDM-98A POWER DOWN DETECTOR
2 SEARCH O CD SEARCH OUTPUT
3 LOAD IN I LOAD SWITCH INPUT
4 Avss – A/D POWER SUPPLY (CONNECTED TO GND)

5,6 – – NO USED

7 Avref1 – D/A REFERENCE VOLTAGE(+5V)
8 RXD I COMMUNICATION FROM MAIN u-COM (UART RXD)

9 TXD O COMMUNICATION TO MAIN u-COM (UART TXD)
10 – – NO USED
11 MD_DATA I MD IC IN DATA (MDM-98A IN DATA)
12 K_DATA O MD IC OUT DATA (MDM-98A OUT DATA)
13 DSCK O MD IC CK (MDM-98A CLOCK)
14 DSTB I MD IC STB (MDM-98A STB)
15 COMM_ANS I NO USED
16 COMM_DIN I NO USED
17 COMM_DOUT O NO USED
18 COMM_CLK I/O NO USED
19 COMM_REQ O NO USED

20~31 – – NO USED

32 6.5/5.0V O MD LOAD VOLTAGE CHANGE-OVER DISC LOAD/EJECT : H OTHER : L
33 Vss – u-COM(CONNECTED TO GND)

34~43 – – NO USED

44 INISW I INITIAL SW

45~58 – – NO USED

59 SRESET O NO USED
60 RESET I u-COM RESET
61 – I NO USED

62~66 – – NO USED

67 CE I u-COM CE
68 Vdd – u-COM POWER SUPPLY
69 X2 – 5MHz OSCILLATOR
70 X1 I 5MHz OSCILLATOR
71 IC – IC TERMINAL(CONNECTED TO GND)
72 NC – NO USED (OPEN)
73 GND I NO USED (CONNECTED TO GND)
74 Avdd – A/D POWER SUPPLY
75 Avref0 I A/D REFERENCE VOLTAGE

76 BACKUP I

BACKUP DETECTOR(A/D)

BACK UP : MORE THAN2.2V NO BACKUP:LESS THAN2.2V
77 AMUTE O ANALOG MUTE H : MUTE ON L : MUTE OFF
78 BACKUPSW O BACKUP DETECTOR SW H:ON(IN CASE of CE : HIGH) L:OFF(IN CASE of CE LOW)
79 MD_RESET O MD u-COM RESET H : NORMAL L : MD u-COM RESET (LOW EDGE)
80 MD_ST O MD ON/CD SYNC H : MD ON L : BACKUP MODE

5-2 Pin description of MD u-COM: uPD78058GC-B20 (X33 :IC1)

6. Test mode

6-1 Test mode of the receiver

(1) Setting of the test mode.

While pressing the [Band] key, plug the AC power cord into an AC power outlet.

(2) Canceling of the test mode.

Unplug an AC power cord.

(3) Condition in test mode.

POWER • • • • • • ON
SELECTOR • • • TUNER [BAND]
FL, LED • • • • • • All the fluorescent display indicate and LEDs light. (The all illuminated state is cleared by pressing any main

unit key or remocon key.

EX. BASS • • • • • OFF

7

CIRCUIT DESCRIPTION

RXD-M51/M51MD

8

(4) Basic operation in test mode.

The muting during mode selection is not controlled in the test mode.
The test mode is cancelled when the AC power is turned OFF.

(5) The operation of the keys in the test mode.

6-2 Test mode of DECK section

(1) Setting

While pressing the TAPE key(DECK), plug the AC power cord into an AC power outlet.

(2) Resetting

Disconnect the AC power cord from an AC power outlet or press the [ON/STANDBY] key.
(3) Operation in TEST mode
(a) Initial condition

Item Condition
Power ON
Selector TAPE
Main VOL. 0dB (VOL. 80)
Input level(AUX) -6dB(INPUT 0)
EX. bass OFF
FL, LED, LCD All the FLs, LEDs, and LCDs are turned on

(b) 4-sec REC

• If the REC key is pushed, the system record for 4sec. Then, it rewinds to the REC starting position and plays back auto­matically.

• If the REC key is pushed during the 4-sec REC operation, the system records further for 4-sec, then returns to the start­ing position of the first 4-sec REC operation and plays back.

SERECTOR

TUNER AUX

OPERATION KEY

MENU

NORMAL ACTIVITY

DISPLAY DISPLAY DISPLAY
VOLUME INPUT BALANCE

(VOLUME15) (INPUT 0 ) (CENTER)

4 P.CALL : DOWN VOLUME 1 INPUT-6(dB) L ch MAX

7

P.CALL : 10 STEP CHANGEOVER

VOLUME 40 INPUT 0 (dB)

CENTER

10 20 30 40 01

¢ P.CALL : UP VOLUME 80 INPUT+3(dB) Rd MAX
REPEAT

EQU.MAX EQU.MINI EQU.FLAT

SOUND

S-LEVEL DISPLAY

(E.T only)

ATT OFF

ATT ON

NORMAL ACTIVITY

TUNER CATT OFF

: S-LEVEL A/D VALUE(HEX)

DOT (DISPLAY) 1st figure 2nd figure 3rd figure 4th figure

MECHA. HALF FWD REC INHIBIT RVS REC INHIBIT CRO2(TYPE¿) CASSETTE HALF

SWITCH DETECTION SW DETECTION SW DETECTION SW DETECTION SW

NG / / / /
OK T A P E

(c) Mechanism half switches indication
The mechanism half switches status are indicated "/ " or "TAPE" on the display as shown below.

6-3-1 Inspection mode

Setting : While pressing the [MD REC] Key, plug the AC power cord into an AC power outlet.

The "INSPECTION" shows on the display.

Cancellation : Unplug the AC power cord from an AC power outlet.

• The "DIGITAL1" is indicated on the display for a
second. "DIGITAL1"

CD input

• Source indicator (MD) is blinked.

• The "ANALOG" is indicated on the display for a
second.

• AUX input level

MID

• Source indicator (MD) is turned ON .

2 Digital through SOUND

test mode

1 Analog through SOUND

test mode

No.

Contents of

Keys Operation & Indication RemarKs

TEST mode

SEL.

MD

(PAUSE)

CD
DIGITAL

SP

SEL.

MD

(PAUSE)

AUX IN
(ANALOG)

REC IN

SP

6-3 Test mode of MD player

1. Preparation for adjustment
Test disc

6-3-2 MD TEST mode for adjustment

Type Test disc

1 High reflection disc TGYS1 (SONY)
2 Low reflection disc Recording minidisc
3 Head Adjusting transparent

2. Test mode
Test mode setting method

1. While pressing the [MD PLAY]key, plug the AC power cord into the AC power outlet.
(Start from A if no disc load, C if disc load.)

A MD

STEP Display

Change to step D if press <MD STOP> key. Return to C if press <MD REC>key.

: MD microprocessor version.

* Repair service is available for AUTO pre-adjustment and AUTO adjustment only.

Press MD STOP key to cancel the test mode if in needless test modes.

B EJECT

C AUT YOBI

Entering the specific mode

Whenever the [MD REC] button is pressed, the mode is changed.

AUTO pre-adjustment AUTO adjustment RESULT SUB RESULT

EEPROM setting MANUAL adjustment MANUAL pre-adjustment

(AUT YOBI) (AUTO AJST) (RST YOBI) (RESULT)

(EEPROM SET) (MNU AJST) (MNU YOBI)

D tsm e : Test mode STOP state

• Canceling the test mode

When the POWER button is pressed, the test mode is canceled, and the POWER OFF state is set.

( ): Display

RXD-M51/M51MD

CIRCUIT DESCRIPTION

2. AUTO adjustment mode

Step No.

Setting Method

Remarks Display

Step 1 Test mode STOP state [ t s m e ]
Step 2

Press the

MD REC button two times.

AUTO adjustment menu [ A U T O _ A J S T _ ]

Step 3 Press once the MD PLAY button. The slide moves to the innermost periphery, and automatic [ : _ _ _ _ _ _ ]

adjustment is started.

• In case of high reflection disc

changes as follows.

PEG→HAG

•In case of low reflection disc

changes as follows.

PEG→LAG→GCG→GEG→LAG

End of adjustment If adjustment is OK, Step 4.

If adjustment is NG, Step 7.

Step 4 Adjustment value output [ _ C O M P L E T E _ ]

Press the MD PLAY button. STEP 5
Press the MD STOP button. STEP 2

1. AUTO pre-adjustment mode (Low reflection disc only)

Step No.

Setting Method

Remarks Display

Step 1 Test mode STOP state [ t s m e ]
Step 2 Press once the MD REC button. AUTO pre-adjustment menu [ A U T O ]
Step 3 Press once the MD PLAY button. The slide moves to the innermost periphery, and automatic [ : _ _ _ _ _ _ ]

pre-adjustment is started.

• During automatic adjustment

changes as follows.
HAo→RFg→SAg→SBg→PTG→PCH→GTG→GCH→RCG→
SEG→RFG→SAG→HAO→HEO→TCO→LAO

End of adjustment If adjustment is OK, Step 4.

If adjustment is NG, Step 5.

Step 4 Grating adjustment, [ _ C O M P L E T E _ ]

adjustment value output
Press once the MD STOP button. STEP 2

Step 5 Adjustment value output [ A U T Y O B I ]

Press once the MD STOP button. STEP 2 AUTO pre-adjustment menu

• : Adjustment name, : Address

• Test Mode

1. AUTO pre-adjustment mode • Automatic pre-adjustment is performed. (After adjustment the grating adjustment mode is set.)

• The adjustment value is output with the aid of system controller interface.

2. AUTO adjustment mode • Automatic adjustment is performed.

• The adjustment value is output with the aid of system controller interface.

• Continuous playback is performed. (Error rate indication, jump test)

3. RESULT sub-mode* • The measurement value, set value and calculated value are indicated.

• The set value is changed manually (in servo OFF state).

4. RESULT mode (final adjustment)* • The set value (after calculation) is indicated.

• The set value is changed manually (in servo OFF state).

5. MANUAL pre-adjustment mode* • RF side manual adjustment is performed.

• Focus and tracking signal ATT manual adjustment is performed.

• Focus and tracking signal offset setting is performed.

6. MANUAL adjustment mode* • Focus

• Don't adjust.

and tracking signal ATT manual adjustment is performed.

7. EEPROM setting mode*

8. TEST-PLAY mode* • Continuous playback from the specified address is performed.

• C1 error rate measurement,

*

This mode is not used for service.

9. TEST-REC mode* • Continuous recording from the specified address is performed.

• Change of record laser output (servo gain is also changed according to laser output)

10. EJECT mode* • TEMP setting (of EEPROM setting)

Step 5

Continuous playback (groove section)

[ a c ]
Step 6 Press the MD STOP button. STEP 2 AUTO adjustment menu
Step 7 Adjustment value output [ C a n ' t _ A D J . ]

Press the MD STOP button. STEP 2 AUTO adjustment menu

• : Adjustment name, : Measurement value, : Address

Step No.

Setting Method

Remarks Display

Figure 1-1 Optical Pickup Grating Deviation

Measuring Method

Mechanism Adjustment

1. Optical pickup grating inspecting method

After the automatic adjustment is performed in the AUTO
mode (test mode) with the aid of high refection MD disc
("COMPLATE" is displayed), the Lissajous's waveform (x-y) is
adjusted.

1. Slightly loosen the 3 screws of spindle moto, and maken an
adjustment, observing the Lissajous's waveform.

2. After adjustment tighten the screw in arder of 1 , 2 , 3 .

Figure 1-2

2. Jitter adjustment and checking method

Figure 1-3 Jitter connection diagram

After performing automatic adjustment in AUTO mode of
TEST mode using the low reflection MD disc, check this jitter
in pit continuous playback and groove continuous playback
mode.

9

43 pin of IC 1101

GND

26 pin of IC 1101

EOUT

25 pin of IC 1101

FOUT

100K

100K

3pin of IC 1201 (TP1274)

EFMMON

13 pin of IC 1201 (TP1275)

GND

1

3

3

Spindle motor

adjusting
hole

2

2

Check the Lissajou's waveform,
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).

CIRCUIT DESCRIPTION

OSILLOSCOPE

470p

470p

GND CH1 CH2

XY

LISSAJOUS'S WAVEFORM

Less thana:b = 3:1

a

b

Spindle Motor

Adjusting hole

1

jitter Meter

RXD-M51/M51MD

10

6-4 Test mode of CD player

6-4-1 Main unit

(1) Setting of the test mode

While pressing the [CD PLAY] key, plug the AC
power cord into an AC outlet.

(2) Canceling of the test mode.

Unplug the AC power cord from AC power outlet or
press the [SET] key.

(3) Operation

6-4-2 Mecha. manual mode

(1) Setting

While pressing the [DISC 1 PLAY] Key, plug the AC
power cord into an AC outlet.

(2) Cancelling

Press the [ON/STAND BY] Key.

(3) Operation

KEYS INDICATION OPERATION
FF CD MANUAL LIFT MOTOR UP
FB CD MANUAL LIFT MOTOR DOWN
DISC 2 CD MANUAL LOAD MOTOR OPEN
DISC 3 CD MANUAL LOAD MOTOR CLOSE

KEY

[DISC3 PLAY]

+AC

CD 5 01

POWER ON, SEL CD
Mecha. initialization
Tray 3 opens

STOP CD 5 01 STOP

FF

CD 5 01

Pick manual feed (INîOUT)
(Stop mode only)

FB

CD 5 01

Pick manual feed (OUTîIN)
(Stop mode only)

SKIP DOWN

SKIP UP

CD 5

CD 5 06

Indication

: Adjustment value/Mean

value (stop mode only)/HEX

Read TOC î play

DOT TNO SEC.

section section section

TB/FB TB value FB value
TG/FG TG value FG value
FE/RF FE value RF value
TE/VC TE value VC value

PLAY/PAUSE

PAUSE

óï

PLAY

(Cyclically

changed)

CD 5 05

PLAY MARK

ON ‰

CD 5 03

PAUSE MARK

ON 8

TRAY CLOSE/DISC CLAMP
03 MODE

(TRACKING SERVO OFF)

05 MODE

DISPLAY OPERATION

DISPLAY DESCRIPTION

BLANK DISC Non Recorded disc
CAN'T COPY Inhibit to record by SCMS
CAN'T EDIT Inhibit to edit by MD standard
CAN'T REC Inhibit to record by disc damage(10 or more

defects/recordable cluster is 0)

DISC ERROR** OR : UTOC read error or FTNO>LTNO

(edit/record) permit ALL ERASE only

DO : Start address TNO>endless TNO

(playback) handle poor TNO as 1SG

(edit/record) permit ALL ERASE only
C0 : Write poor data in UTOC0
C1 : Write poor data in UTOC1
C2 : Write poor data in UTOC2
C4 : Write poor data in UTOC4

(play back) playback even if address

roof(C0)

(edit/record) permit ALL ERASE only

DISC FULL No recordable area
MECH ERR** 10-13 : head poor down

20-23 : head poor up

no disc No disc in the unit
NO TRACKS Disc recorded title only
NOT AUDIO Disc recorded audio signal.
PLAY ONLY Record to music disc
PROTECTED Record disc inhibited to record
READING In mode of reading TOC or UTOC
SRCH ERR** 30 : Search time over in playback, FF or FB

31 : Search time over in REC-PAUSE
32 : Search time over in record

TEMP OVER High temperature
TITLE FULL Input over letter of title
UNIT ERROR Hardware damage
UTOC W ERR Error of writing to UTOC
WRITING In writing to UTOC

7. MD mechanism error message

RXD-M51/M51MD

CIRCUIT DESCRIPTION

(b)

(a) Laser Power

Pickup

0.05~0.15 mW

Optical power meter

RF signal in test mode (PLAY).
Perform the tangential and focusing offset are focused
into one point on the display. The crossing points above
and below the center shall also be looked clearly.

No.

1

2

ITEM

LASER

POWER

FOCUS

ERROR

BIAS

INPUT

SETTING

–

Test disc

Type 4

OUTPUT

SETTING

Connect an oscilloscope

as follows.

(+)side : RF(CN1-1)

GND : VC (CN1, 4)

Set the senor section of
the optical power meter

on the pickup lens.

PLAYER

SETTING

Press the "PLAY"

key to check that the

display is "03".

Press the "PLAY"

key. Confirm that

the display is "05".

ALIGNMENT

POINT

VR1

–

ALIGN FOR

On the power

from.0.05 to

0.15mw. when the

diffraction grating is

correctly aligned

with the RF level of

0.8Vp-p or more

Optimum eye pattern

FIG.

(a)

(b)

Note:
Type 4disc :SONY YEDS-18 Test Disc or equivalent.
LPF : Around 47kΩ + 390pF or so.

Adjustment of CD player

TEST MODE : While pressing the [DISC 3 PLAY] key, plug the AC power cord into the AC outlet.

RF signal : AC coupled

★ The MD Adjustment is listed on page 8 through p10.

AG

{

(A)

(B)

Oscilloscope

AC voltmeter AC voltmeter

Frequency counter

X09 CN3
TEST PIN

1
2
3

PLAY (L)
GND
PLAY (R)

RVS FWD

NO. ITEM

INPUT

SETTING

OUTPUT
SETTING

CASSETTE TAPE
DECK SETTING

ALIGNMENT

POINTS

ALIGN FOR FIG.

Unless otherwise specified, set the respective switches as follows: 0dBs = 0.775V
TAPE : NORMAL DOLBY : OFF
I Cassette mechanism unit (Adjustment of the REC / PLAY head)

(1)

Demagnetization

and cleaning

——

Power : OFF

Demagnetization,

cleaning, PLAY

Recording

head, erase

head, capstan

pinch roller

Demagnetize the REC / PLAY head
with the head eraser. Clean the REC/
PLAY head, erase head, capstan and
pinch roller using a cotton swab slightly
damped with alcohol.

(2)

Azimuth of the

REC / PLAY

head

SCC-1727
TCC-153
MTT-114

10kHz, -10dB

(B) PLAY

Adjust the output to maximum and
adjust the azimuth adjustment screw
for the Lissajours waveform pattern of
the oscilloscope to become close to a
45˚ straight ling.

II PC board adjustment.

(1)

BIAS

CURRENT

(A)

Adjust the AG for the

output of the DECK to

become 12.5KHz –20dBs.

400Hz / 12.5kHz

(AC-224)

(B) REC PLAY

VR3(L)
VR4(R)

Record 400Hz and 12.5kHz alternately,
and adjust the bias current adjustment
potentiometer for the playback levels to
become the same.

ADJUSTMENT

11

RXD-M51/M51MD

12

CN4

CN1501

CN2 CN205

CN2

WH1

WH202

CN202

WH201

GND

FM 300

AM ANT

FM 75

AM ANT

FM
300

GND

FM
75

Lch 1

Rch 2

AUX IN

J1

J201

J201

A201

CN206 CN1

CN207 CN2

WH203 CN11

CN4 CN1

CN1 CN2

E4

E6

E1

E5

WH4WH3

WH1

R-ch

L-ch

1

2

J1

CN6

CN4

CN7 CN8

SPEAKERS

E3

CN3

CN5

WH1

E1

J1

HEADPHONE

RXD-M51 (X07-299X-XX)

RXD-M51MD (X07-2992-71)

RXD-M51 (X09-612X-XX)

RXD-M51MD (X09-6122-71)

RXD-M51MD (X33-1172-71)

DIGITAL OUT
(OPTICAL)

A301

WH2

FAN

28

28

28

1

1

18

1

1

12

12

1

12

E35-2015- 5

7

1

7

1

6

16

1

5E35-2200-

6

16

16

1

2

18

1

12 12

11

10 10

11

2

1

1

2

12 12

11

10 10

11

2

9

1

10

1

1

12

(M)

(T,E)

: AC110-120V/220-240V~

50/60Hz

: AC230V~ 50Hz

WH6

WH5

BRN

YEL

15

1

2

2

1

15 1 10

1

9

12

1

12

10

5

F1

2

1

5

5

1

5

1

DESTINATION

ABB.

COUNTRY

EUROPE

U.K.ET

UNIT No.

2-71

GENERAL MARKET

ABB.

EUROPE

U.K.ET

COUNTRY

DESTINATION

M

2-72

UNIT No.

0-21

EUROPE

U.K.

DESTINATION

GENERAL MARKET

COUNTRY

E

T

M

2-72

0-21

ABB.

UNIT No.

EUROPE

DESTINATION

U.K.

COUNTRY

E

T

2-71

ABB.

UNIT No.

EUROPE

U.K.

COUNTRY

E

T

ABB.

2-71

DESTINATION

UNIT No.

7

1

6

1

2

1

2

1

P1

9

(D40-1602-

MD MECHANISM

5)

(X33-117X-XX)

USED RXD-SE5MD/RXD-M51MD

MECHANISM
(D40-1601- 5)

CASSETTE

(D40-1612-

CD MECHANISM

5)

(X09- ) (B/2)

USED (T,E)TYPE

USED (M)TYPE

(A/2)

USED
RXD-M51

(X07-299X-XX) (A/5)

(X07- ) (B/5)

(X07- ) (D/5)

(X07- ) (E/5)

(F09-0140-

FAN

PRIMARY UNIT

SECONDARY UNIT
(X07- ) (C/5)

(X14- ) (B/2)

HEADPHONE

RXD-M51

MD UNIT

(X09-612X-XX)

AUDIO UNIT

RXD-M51(T,E)/RXD-M51MD(T,E)

RXD-M51(M)

TUNER PACK

: W02-2666-05

: W02-2667-05

RXD-M51MD

RXD-SE5MD/

USED

(X14-4870-00)

DISPLAY UNIT

(A/2)

5)

RXD-M51MD

USED

POWER AMPLIFIER UNIT

RXD-M51MD

MDM-98A

RXD-M51/M51MD

WIRING DIAGRAM

ACEBD

PC BOARD PARTS LOCATION

1

2

3

4

5

6

7

Refer to the schematic diagram for the value of resistors and capacitors.

MD MAIN PWD-A (TOP VIEW)

13

F GIHJ

PC BOARD PARTS LOCATION

1

2

3

4

5

6

MD MAIN PWB-A (BOTTOM VIEW)

7

14