Kenwood LSM-31, RXDM-31 Service manual

d

o

w

n

u

p

on/standby

TAPE rec

menu

panel

TAPE

direction

STOP

CD

open / close

set / demo

TUNER / band

4

4

AUX

repeat sound

VOLUME / multi control

O.T.E.

CD TAPE

6

tape

EQ.

7

2

2

Auto Reverse

phones

push open

0

TAPE / preset

1

1

Top panel
(A21-3780-08)

Display lens *
(B12-)

Knob (REPEAT)
(K29-7629-08)

Knob (SOUND)
(K29-7633-08)

Knob (O.T.E)
(K29-7632-08)

LED lens (MIDDLE)
(B12-0376-08)

Knob (VOLUME)
(K29-7626-08)

Sensor lens
(B12-0375-08)

Cassette door cover
(SILVER)
(A02-2922-08)

Cassette door lens
(B10-3524-08)

Panel cover
(A21-3778-08)

Rubber foot
(J02-1456-08)

Knob
(FF/TUNER/AUX)
(K29-7631-08)

Head phone jack
(E11-0398-08)

Knob (SET/DEMO)
(K29-7630-08)

Knob (MENU)
(K29-7628-08)

Knob
(TAPE/EQ/CD)
(K29-7634-08)

Knob
(TAPE/STOP)
(K29-7635-08)

Control panel *
(A21-)

Knob
(ON/STANDBY)
(K29-7636-08)

Knob
(PANEL OPEN/CLOSE)
(K29-7637-08)

Knob (TAPE REC)
(K29-7627-08)

MICRO HiFi COMPONENT SYSTEM

RXD-M31/LS-M31(S)

SERVICE MANUAL

(HM-331)**

© 1999-4/B51-5521-00 (K/K) 3590

**Refer to page 2 if you wnat to know system configuration.

086-5306051

¢

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.

RXD-M31

CONTENTS / ACCESSORIES / CAUTIONS

Contents

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

EXTERNAL VIEW........................................................3

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

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

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

Accessories

Please confirm that the following accessories are present.

FM indoor antenna (1) Loop antenna (1)

Europe, and U.K.
(T90-0810-05) : ET

Other countries
(T90-0801-05) : KPMX

PC BOARD..................................................................9

SCHEMATIC DIAGRAM............................................14

EXPLODED VIEW.....................................................27

PARTS LIST...............................................................29

SPECIFICATIONS.....................................................37

* AC

plug adaptor (1)

(T90-0846-08) (E03-0115-05)

(Accessory only for regions where
use is necessary.)

* Use to adapt the
plug on the power
cord to the shape
of the wall outlet.

Batteries (R6/AA) (2)

Remote control unit (1)

(A70-1242-05) : RC-F0503E.....ET

(A70-1241-05) : RC-F0503........KPMX

Battery cover (A09-1114-08)

System configuration

SYSTEM MAIN UNIT SPEAKER

HM-331 RXD-M31 * LS-M31(S)

*Refer number for LS-M31(S), refer to parts list on page 36.

Cautions

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.
÷Please note that resetting the microcomputer clears the

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

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

set/demo

2

2

2

FM

300W

FM

75W

AM

GND

DIGITAL

OUT

OPTICAL

ANTENNA

AUX INPUT

AC 110–120V AC 220 –240V

SPEAKERS

(

6–16

Ω

)

+
–
–
+

SUPER
WOOFER
PRE OUT

MANUAL

AUTO

PANEL
OPEN/CLOSE

R

R

L

L

PVC cover
(BLACK)
(F07-1685-08)

Lock terminal board
(E70-0112-08)

RXD-M31

EXTERNAL VIEW

Metal plate
(LEFT SIDE)
(J21-6762-08)

Speaker terminal
(E70-0113-08)

Phono jack
(E63-1092-08)

Oscillating module
(OPTICAL)
(W02-1114-05)

RCA jack
(E63-1091-08)

Metal plate
(RIGHT SIDE)
(J21-6763-08)

Slide switch *
(S62-0091-08)

Slide switch
(S62-0090-08)

Power cord bushing *
(J42-)

AC power cord *
(E30-)

* Refer to parts list on page 29.

3

RXD-M31

DISPLAY

MAIN BOARD

ONLY

E,T TYPE

POWER BOARD

RXD-M31

BOARD BOARD

KEY

CASSETTE BOARD

TRANSFORMER BOARD

AUX IN

ATT

-3dB

FM
AM

ANT

TUNER

ERASE

R/P

BIAS TRAP

OSC

BIAS

Q713

IC702

IC703

FE-BIAS

VR201

(RF-AMP)

CXA1571M

IC202

CXD2587Q

(DSP/DAC/CD-TEXT)

IC201

(4ch BTL-DRIVER)

BA5979S

IC203

MECHA.

CD

DIGITAL OUT

RDS

(MAIN u-COM)

IC401

IC103

REMOTE

FL

FL
DRIVER

(A/D)

KEY

ENCODER

ROTARY

C0NTROL

LED

MID
TREBLE

BASS

EX.BASS
LOUD

JK602

HEADPHONES

AMP

POWER

D+12V

F.OFF

u-COM

CD+B

FL

FL FILAMENT

IC801

J1001 1007IC1001

IC701

IC301

Q601,

IC601

Q612

-32V
AVR

+8.0V

Q607

AC IN

DIGITAL OUT

JK302

DECK

JK601

SPEAKERS

JK301

JK101

Q712

MECHA.

DECK

Q1001-

603

AC5.6V

+5.6V

Q611

-18.5V

+18.5V

POWER
AMP

AVR

+12V

Q604

FE
TE
SI
RF

FFDR
FRDR
TFDR
TRDR
SFDR
SRDR
MDP

Rch-OUT

Lch-OUT

PB AMP

REC AMP

DOUT

(FCS.TRK.SLD.SFD-DRIVE)

+3dB

MUTE

200mV

DECK

TUNER

AUX

CD

+12V

BLOCK DIAGRAM

4

4. Main microprocessor M30622MA-198FP (MAIN BOARD IC401)

4-1 Microprocessor periphery block diagram

4-2 Key matrix

Vref = 5V

Desti-

U-COM Discrimination

Receiving frequency Channel

nation

Desti-

DSW4 DSW3 DSW2

Band range space

IF RF

nation

K, P K1 0 0 0

FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz
AM 530kHz~1700kHz 10kHz +450kHz 10kHz

M, X K2 0 0 1

FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz
AM 530kHz~1610kHz 10kHz +450kHz 10kHz

JJ01

FM 76.0MHz~108.0MHz 100kHz -10.7MHz 25kHz
AM 531kHz~1629kHz 9kHz +450kHz 9kHz

E, T

E1

110

0

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

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

3. Destination list of TUNER

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

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

IC202

IC801

DISPLAY
BOARD

Q1001

~1007

IC301

IC702

IC102

IC103

E TYPE
ONLY

IC401

CD mechanism

Mechanism
control
circuit

Mechanism
control
circuit

Auto reverse
cassette
mechanism

Head amp

CXD2587Q

CD-DSP

TUNER

PLL IC
LC72131

AUDIO

AMP SYSTEM IC
(LC75396)

LED

FD801

FL
CM1829C

Key matrix
encoder
remocon

RDS

demodu­lator

DOT driver
LC75710NE

LED driver

M30622MA-198FP

u-COM

VOLTAGE

[V]

MENU

REC

O.T.E

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, and CASSETTE mechanism
are also initialized.

• During the initial operation, the display shows "INITIAL­IZE" and normal indication, after that it goes off immedi­ately.

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 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
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

DIRECTION FORWARD

DECK RVS MODE p

OPERATION MODE STOP

back up data

5

CIRCUIT DESCRIPTION

RXD-M31

6

Pin No. Name I/O Description

52

PWX33

– NO USED
53 ENC1 I ROTARY ENCODER1 (VOL. INPUT A)
54 ENC2 I ROTARY ENCODER2 (VOL. INPUT B)
55 LED5 – NO USED
56 LED4 O LED OUTPUT D1032 SELECTOR CD H : ON L : OFF
57 LED3 O LED OUTPUT D1031(RED) STANDBY H : OFF L : ON
58 LED2 O LED OUTPUT D1031(GRN) STANDBY H : OFF L : ON
59 LED1 O LED OUTPUT D1035 TAPE DIRECTION(FWD) H : ON L : OFF
60 LED0 O LED OUTPUT D1034 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 – NO USED
73 PLAY SW I DECK PLAY SW INPUT H : OFF L : ON
74 B1/2 – NO USED
75 A120/70 – NO USED
76 BIAS O DECK BIAS CONTROL H : ON L : OFF
77 NOR – NO USED
78 REC/PLAY – NO USED
79 NR ON – NO USED
80 S.CL O CLOCK OUTPUT TO SYSTEM IC/PLL IC
81 PRT MD – NO USED
82 FAN H/L – NO USED
83 FAN ON/OFF – NO USED
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 TU. MT O TUNER MUTE CONTROL H : ON L : OFF
87 PWR07 O POWER RELAY CONTROL H : ON L : OFF
88 PRT07 I PROTECTION DETECT H : PROTECTION ON

89-91 KEY1-KEY3 I KEY A/D INPUT1-3
92,93 A/DP1,A/DP2 I NO USED

94 TA. MT 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 S. DT O DATA OUTPUT TO SYSTEM IC/PLL IC

65 66

H H REC
L H REC PAUSE,ARM

L L PLAY

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 – NO USED
6 RDS DATA I RDS DATA INPUT E,T TYPE ONLY
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)
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)
27 CD RST O CD DSP RESET OUTPUT (CXD2587Q) H : NORMAL L : RESET
28 SQCK O CD SUB CODE CLOCK (CXD2587Q)
29 SQSO 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 CDZD – NO USED
35 UA RT1 – NO USED
36 UA RT2 ––NO USED
37 LCD O CD LASER OUTPUT CONTROL H : OFF L : ON
38 NC O NO USED
39 MD RST NO USED
40 CD MON O CD MON OUTPUT H : ON L : OFF
41 NC O NO USED
42 DM SHORT O SAME CD POWER SIGNAL H : OFF L : ON
43 DOOR SW I CD DOOR SWITCH INPUT H : OPEN L : CLOSE

44,45 NC O NO USED

46 MODEL I DESTINATION DISTINCTION (MODEL) H : RXD-M31
47 DOLBY I NO USED

48-50 CODE2~4 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-198FP (MAIN BOARD IC401)

RXD-M31

CIRCUIT DESCRIPTION

5-3 Test mode of CD player

5-3-1 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.

(3) Operation

KEY

[CD PLAY]

+AC

CD 5 01

POWER ON, SEL CD
Mecha. initialization

STOP CD 5 01 STOP

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

03 MODE

(TRACKING SERVO OFF)

05 MODE

DISPLAY OPERATION

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.

(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.

5-2 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)

7

P.CALL : 10 STEP CHANGEOVER

VOLUME 40 INPUT 0 (dB)

10 20 30 40 01

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

EQU.MAX EQU.MINI EQU.FLAT

SOUND

S-LEVEL DISPLAY

(E.T only)

ATT OFF

ATT ON

NORMAL ACTIVITY

TUNER ATT OFF
(NORMAL DISPLAY)

: S-LEVEL A/D VALUE(HEX)

5. Test mode

5-1 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-M31

(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(IC201,17pin)

GND: VREF(test pin)

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

VR201

–

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

RF signal : AC coupled

No.1ITEM

TUNED
LEVEL

INPUT

SETTING

OUTPUT

SETTING

TUNER

SETTING

ALIGNMENT

POINT

–

ALIGN FOR FIG.

Adjustment of tuner

(A)

98MHz,

31.2dBf (ANT INPUT)
1kHz, ±40kHz DEV

Adjust VR1 and stop

at the point where

ED1 (TUNED)

goes ON.

VR101

MONO 98.0MHz

FM

300W

FM
75W

AM

GND

DIGITAL

OUT

OPTICAL

ANTENNA

AUX INPUT

AC 110–120V AC 220–240V

SPEAKERS

(

6–16

Ω

)

+
–
–
+

SUPER
WOOFER
PRE OUT

MANUAL

AUTO

PANEL
OPEN/CLOSE

R

R

L

L

AG

{

(E)

(B)

Oscilloscope

AC voltmeter AC voltmeter

Frequency counter

(A)

(C)

(D)

Dummy antenna

FM-MPX-SG

FM-MPX-SG POLAR SG

AM-SG

MAIN BOARD
CN404

1
2
3

PLAY (R)
PLAY (L)
A. GND

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

(E)

• Set the AUX input level
to +3dB.

• Adjust the AG for the
output of the deck to
become -20dB
(400Hz/12.5kHz)

(B) REC PLAY

VR701(L)

VR702(R)

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

Adjustment of cassette deck

RXD-M31

ADJUSTMENT

8

1

16

17

32

33

48

49

64

SW1007
OP/CL

E

B

D1032

SW1004

(TAPE EQ)

CD

SW1003

(CD)

MD

SW1001

TAPE

SW1006

POWER

SW1002

V1001

J1018

J1017

CONTROL BOARD

C1003

CN1001

J1016

IC1001

J1015

J1013

Q1001

Q1003

Q1002

Q1004Q1005

Q1006

Q1007

J1014

18

D1031

EJECT

SW1005

STOP

EB

E

B

BEBE BEBE

D1033

J1001

D1035

D1034

J1002

J1003

J1009

J1010

J1011

J1012

J1007

J1008

J1006

J1004

J1005

18

3

1

115

214

E

1

2

11

10

BEB E

E

E

E

E

B

B

B

E
B

1

17

B

BEB

E

E

B

B

E

1

1

1

1

4

5

5

4

1

18

B

9

9

1

1

6

1

1

1

20

22

11 12

12 2

11 1

A BDFHJCEGI

PC BOARD (Component side view)

1

KEY CONTROL UNIT

2

CASSETTE DECK UNIT

POWER UNIT

3

4

5

DISPLAY UNIT

6

7

9 10

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