Kenwood RXDM-52-L Service manual

70%

MICRO HiFi COMPONENT SYSTEM

RXD-M52-L

SERVICE MANUAL

(HM-532-L)

Althrough this service manual is described MD circuit description, it is no concern with RXD-M52(deck version).

Knob (K29-7769-03)

Knob (K29-7772-14)

Indicator (B12-0398-04)

Front glass (B10-3606-03)

Dressing panel * (A21-)

Knob (K29-7773-04)

Escutcheon (B07-2525-12)

Panel (A29-1104-04)

Knob (K29-7770-13)

In compliance with Federal Regulations, following are reproduction of labels on, or inside the product relating to laser product safety.

* Refer to parts list on page 27.

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

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

(T90-0852-05)

(A70-1401-05): KMX.....RC-M0302

(A70-1403-05): TEH......RC-M0302E

Battery cover (A09-1161-08)

(E30-5828-05)

(T90-0858-05) (J02-0624-08)

AM loop antenna (1)

Remote control unit (1)

Batteries (R6/AA) (2)

Feet for speaker (8)

Speaker cords(2)

FM indoor antenna (1)

* AC plug adaptor (1)

(E03-0115-05)

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

(Accessory only for regions where use is necessary)

RXD-M52

/demo

CONTENTS / ACCESSORIES / CAUTIONS

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

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

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

ADJUSTMENT ............................................................7

PARTS DESCRIPTIONS ............................................8

Accessories

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

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

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

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

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

System configuration

SYSTEM MAIN UNIT DESTINATION SPEAKER COLOR

HM-532-L RXD-M52-L KETMXH LS-M52-L BLUE

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 menu/demo key depressed, plug the power cord again.

EXTERNAL VIEW

RXD-M52

Lock terminal board (E70-0053-05)

Pin jack (E63-0164-05)

Pin jack (E63-1082-05)

Oscillating module (W02-2732-05)

AC power cord * (E30-)

AC power cord bushing (J42-0083-05)

Lock terminal board (E70-0127-05)

* Refer to parts list on page 27.

RXD-M52

CD mecha unit

CDM-34

DECK mecha unit NJU3713D (IC4)

EXPANDER IC

X28

MDM-06

MD mecha unit

HD6432227N01FA

Back up circuit

A/D

X29, IC1

M30624MG-304FP(DECK)

-303FP(MD)

SIO

PWM

Main uCOM

PWM

A/D

AMP hadrware circuit

AMP_ system_IC (input selecter)

TUNER unit (RDS unit)

CD TAPE MD TUNER AUX

X29, IC8

A/D

A/D A/D

INT

RESET

EEPROM

INT

UART

A/D A/D

encoder

REM

stnby

eject

cd md/ tape

Key matrix

(8keys X

2 lines)

LCD module (64✽64dot)

LCD driver

RESET & CE circuit

(mech ucom)

CIRCUIT DESCRIPTION

1. Initializing the CD/CASSETTE Receiver

1-1 Initialization Method

The CD/CASSETTE receiver will be initialized when you pressed [SOUND] key and turn the AC on.

1-2 Contents of Initialization

CD disc will be ejected from CD mechanism after initialized.

2. Conditions according to the Destination

( ) Port of Microprocessor

UNIT 3 2 1 BAND FREQUENCY IF RF EMPHASIS

DESTI-

NATION

K,P KI 0 0 0

ME1 0 0 1

E,T

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

DESTINATION SW RECEIVING

(40Pin) (39Pin) (38Pin) RANGE

FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 1 AM 530kHz~ 1700kHz 10kHz +450kHz 10kHz 0 FM 87.5MHz~108.0MHz 50kHz +10.7MHz 25kHz 0 AM 531kHz~ 1602kHz 9kHz +450kHz 9kHz 0

110

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

CHANNEL

SPACE

3. Microprocessor :M30624MG-303FP(MD version)

3-1 Microprocessor periphery block diagram

:M30624MG-304FP(DECK version)

RXD-M52

CIRCUIT DESCRIPTION

3-2 Pin Description of Microprocessor

Pin No. Pin Name I/O Description

1 8SW2 I Detection port of 8cm disc for CD mechanism. 2 SCLK O Clock output to DSP IC(X29,IC9). 3 SENS I Sense input port from DSP IC(X29,IC9). 4 FAN/DA O Control port of fan motor. 5 DATA O Data output to DSP IC(X29,IC9). 6 XRST O Reset output to DSP IC(X29,IC9). 7 CLOK O Clock output to DSP IC(X29,IC9). 8 BYTE - Connected to ground.

9 CNVSS - Connected to ground. 10 XTIN I Clock input(32.768kHz). 11 XTOUT O Clock output(32.768kHz). 12 RESET I Reset signal input. 13 XOUT O Main clock output(1MHz). 14 VSS - Connected to ground. 15 XIN I Main clock input(1MHz). 16 VCC - Power supply. 17 NMI - Power supply. 18 u-COM CE I Detection port of AC off. 19 REM I Input port of remote control signal. 20 SCOR I Input port of sub code synchronized signal. 21 STBY RED O Standby LED(red) control terminal. 22 LCD BKLT O Control terminal of LCD back light. 23 STBY GR O Standby LED(green) control terminal. 24 LED CD O LED(CD) control terminal. 25 LED MD/TAPE O LED(MD/TAPE) control terminal. 26 CD XLAT O Latch output to DSP IC(X29,IC9). 27 ENC A I Input port of volume encoder. 28 ENC B I Input port of volume encoder. 29 MD RXD I Data input from MD mechanism microprocessor. 30 MD TXD O Transmission data output to MD mechanism microprocessor. 31 LCD SI O Data output to LCD driver. 32 LCD AO O AO control to LCD driver. 33 LCD SCL O Clock output to LCD driver. 34 LCD RST O Reset output to LCD driver. 35 SMK M/D I Discrimination port for deck and MD. 36 SQSO I Data input for CD sub Q data. 37 SQCK O Clock output for CD sub Q data.

38-40 SMK1-3 I Discrimination port of destination for TUNER.

41 STB O Strobe output to NJU3713D(X28,IC4). 42 W/R O Unused. 43 SDA I/O E2PROM data. 44 SCL O E2PROM clock output.

45 OP SW I Input port of open switch for deck(deck version only). 46 LCD CSI O CE output to LCD driver.

47 CL SW I Input port of close switch for deck(deck version only).

48 PH SW I Input port of photo sensor for deck(deck version only).

49 REC F SW I Deck forward switch input(deck version only).

50 HALF SW I Input port of half switch for deck(deck version only).

51 PLAY SW I Input port of play switch for deck(deck version only).

52 TYPE SW I Detection port for tape type(Normal/CrO2).

53 REC R SW I Deck reverse switch input(deck version only). 54 SBUSY - Unused. 55 SDATA - Unused. 56 RDS DATA I RDS data input(E/T type only). 57 TMUTE O TUNER muting control. 58 SD I Detection terminal of SD signal for TUNER. 59 ST I Detection terminal of stereo signal for TUNER. 60 PLL DATA O Data output to PLL IC. 61 PLL CLK O Clock output to PLL IC. 62 VCC - Power supply. 63 PLL CE O PLL chip enable. 64 VSS - Connected to ground. 65 PLL DO I PLL IF count input. 66 EMP/MONO O Control port of DE-emphasis.

RXD-M52

CIRCUIT DESCRIPTION

Pin No. Pin Name I/O Description

67 AMUTE O Audio muting control. 68 SPRLY O Speaker relay control. 69 PWRRLY O Power relay control. 70 NC - Disconnected. 71 HPRLY O Relay control terminal for headphones. 72 HPDET I Detection terminal of headphones. 73 EVR CLK O Clock output to sound controller(X29,IC6). 74 EVR DATA O Data output to sound controller(X29,IC6). 75 RDS CLK I RDS clock input(E/T type only).

76 BACK CHK/ DECK SLT CL O

77 BACK ON/ DECK SLT OP O

78 MD RST/DECK CLK O Reset of MD mechanism and the clock of expander IC for deck. 79 MD CE/DECK DATA O CE of MD mechanism and the data of expander IC for deck. 80 MSTOP I Detection port of loading end for CD mechanism. 81 LD ON O Control port of laser on. 82 SPEED O Play back output port of hi-speed for CD. 83 DC OFF O Power control of system IC(X29,IC10) for CD. 84 LOAD OUT O Control port of loading out for CD mechanism. 85 LOAD IN O Control port of loading in for CD mechanism. 86 V/H O Control port of vertical and horizontal for CD. V/H version only 87 DINSW I Detection port of disc in for CD. 88 8SW1 I Detection port of 8cm disc for CD. 89 XY SW I Input port of sensor for vertical and horizontal. V/H version only 90 PROT I Detection port of current protection. 91 PROT TEMP I Detection port of temperature compensating for protection. 92 AIN LEVEL I Input port of audio signal. 93 BACKV I Input port of back up voltage for MD. 94 RDS SLEVEL I RDS signal level input(E/T type only). 95 KRO I Key return signal input. 96 AVSS - Connected to ground. 97 KR1 I Key return signal input. 98 AVREF - A/D,D/A reference voltage. 99 AVCC - A/D,D/A power supply.

100 12SW I Detection port of 12cm disc for CD.

Deck version only.

Detection port of back up voltage for MD mechanism. (MD version) Control port of slot closing for deck. (Deck version) Power on for MD mechanism. (MD version) Control port of slot opening for deck.(Deck version)

4. CD Test Mode

4-1 Entering the Test Mode

To enter the test mode, press the CD [PLAY/PAUSE] key and turn the AC on.

4-2 Cancelling the Test Mode

Turn the AC off.

4-3 Keys and Operation in the Test Mode

KEYS LCD OPERATION

CD CD TEST-03 Tracking servo off.

PLAY/PAUSE CD TEST-05 All servo on.

menu/demo –

sound

set

CD TEST-22 HI Hi speed (CD servo) when

CD TEST-22 Normal speed (CD servo) when

CD TEST-05

FB operation when servo on. Sled in when servo off.

stop mode

stop mode. FF operation when servo on. Sled out when servo off.

5. Cassette Deck Test Mode

5-1 Entering the Test Mode

5-1-1 Tape Check Mode

• Turn the AC on with pressing the TAPE[PLAY] key.

5-1-2 Mechanism Check Mode

• Turn the AC on with pressing the TAPE[PLAY] and [menu] keys simultaneously.

5-2 Cancelling the Test Mode

Turn the AC off

5-3 Keys and Operation in the Test Mode

TEST MODE KEYS OPERATION

DISPLAY

1Mecha.Test menu/demo Loading Test(Load in)

Mode sound Loading Test(Load out)

SLEEP Change-over the vertical and

(remote control) horizontal for LCD.

rec 4seconds recording

2Tape Check set Change-over the dolby on/off.

Mode

sound

Change-over the test mode indication.

Change-over the beat cancel on/off.

CD section

NO. ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

CD PLAYER

SETTINGS

ALIGNMENT ALIGN FOR FIG.

TEST MODE : While pressing the CD PLAY/PAUSE key, plug the power cord into the AC power wall output. Load the TEST DISC.

[1]

LASER CURRENT CHECK

Test disc

type 4

Connect the DC voltmeter between 3 and 4 of CN4 on X29.

Press the PLAY/PAUSE

key to check that the

display is 03 or05.

—

50±20mA

[2]

FOCUS ERROR

BIAS

(Set up vertically)

Test disc

type 4

Connect an oscilloscope as follows.

Press the PLAY/PAUSE key . Confirm that the display is 05.

FE BIAS

VR 1

(V/H version only)

Optimum eye pattern

[3]

FOCUS ERROR

BIAS

(Set up horizontally)

Test disc

type 4

Connect an oscilloscope as follows. CH1:RF(X29,CN4, 1) GND:VC(X29,CN4, 2)

CH1:RF(X29,CN4, 1) GND:VC(X29,CN4, 2)

Press the PLAY/PAUSE key . Confirm that the display is 05.

FE BIAS

VR 2

Optimum eye pattern

Note:

Type 4disc: SONY YEDS-18 Test Disc or equivalent.

Keep the step of adjustment.

CASSETTE DECK

NO. ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

CASSETTE DECK

SETTINGS

ALIGNMENT ALIGN FOR FIG.

Unless otherwise specified, set the respective switches as follows:

TAPE: NORMAL INPUT: AUX IN OUTPUT: AUX OUT 0dBm=0.775V

ø. Cassette mechanism (REC/PB head adjustment)

Demagnetization and cleaning

——

(POWER OFF)

demagnetization

(PLAY)

cleaning

REC/PB head

erase head

capstan

pinch roller

Demagnetize the REC/PB head by head eraser. Clean the REC/PB head ,eraser head, capstan and pinch roller with a cotton swab immersed in alcohol.

REC/PB head

azimuth

TCC-153

MTT-114

10kHz,-10dB

(B) PLAY

Adjust the output to maximum and adjust the azimuth adjustment screw for the Lissajous waveform pattern of the oscilloscope to become close to a 45ß straight line.

¿. Capstan motor adjustment

Tape speed

(NORMAL)

TCC-110

MTT-111

3kHz

(B) PLAY

VR.

inside motor

Adjust so that the frequency 3kHz at the center of the tape.

¡. PC board adjustment

Playback level TCC-130 (B) PLAY

VR1(Lch),VR2(Rch)

-2.5dBm

(B) REC PLAY

Bias current

TCC-108

12.5kHz

-24dBm (A)

VR3(Lch) VR4(Rch)

-24dBm

Measurement equipment connection

FWD

RVS

{

(A) (B)

AC voltmeter AC voltmeter

Oscilloscope

Distortion meter

ADJUSTMENT

RXD-M52

PARTS DESCRIPTIONS

+ 18 hidden pages