Kenwood RXD-M47MP Bedienungsanleitung

COMPACT Hi-Fi COMPONENT SYSTEM

RXD-M47MP

SERVICE MANUAL

B51-5934-00 (K/K) 715

70%

In compliance with Federal Regulations, following are repro-

duction of labels on, or inside the product relating to laser

product safety.

KENWOOD Corp. 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.

Caution : No connection of ground line if disassemble

the unit. Please connect the ground line on

rear panel, PCBs, Chassis and some others.

CD cover ass’y

(F07-2030-08)

Phone jack

(E63-1365-08)

Power knob

(K29-8426-08)

Display/Rec. knob

(K29-8428-08)

Search knob

(K29-8430-08)

Cass lid ass’y

(A53-2455-08)

Front cabinet

(A60-2427-08)

Volume knob

(K29-8429-08)

CD/Tuner/Tape knob

(K29-8431-08)

EQ/Bass knob

(K29-8427-08)

TEL 13942296513 QQ 376315150 892498299

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

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

ADJUSTMENT .............................................................4

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

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

EXPLODED VIEW .....................................................19

SPECIFICATIONS..................................BACK COVER

Remote control unit (1)

(A70-1692-08)

AM loop antenna (1)

(T90-0908-08)

ANT TERMI CVR

(F07-2029-08)

Batteries (R6/AA) (2)

(–)

Plug in the AC power cord to the wall out-

let, and within 5 seconds, press and hold

down the button and press CD button.

The marking of products using lasers

The marking this product has been classified as Class 1. It

means that there is no danger of hazardous radiation out-

side the product.

Location: Bottom

CLASS 1 LASER PRODUCT

LASER KLASSE 1

APPAREIL A LASER DE CLASSE 1

LUOKAN 1 LASERLAITE

KLASS 1 LASERAPPARAT

Resetting the Microcomputer

The microcomputer may malfunction (unit can-

not be operated, or shows an erroneous dis-

play)if the power cord is unplugged while the

power is ON, or due to some other external

factor. If this happens, execute the following

procedure to reset the microcomputer and re-

turn the unit to its normal operating condition.

Please note that resetting the microcomputer

will clear the contents of the memory and

return the unit to the state it was in when it

left the factory.

RXD-M47MP

CONTENTS / ACCESSORIES / CAUTIONS

Accessories

Cautions

System configuration

SYSTEM RECEIVER SPEAKER

HM-437MP RXD-M47MP LS-M47

Contents

TEL 13942296513 QQ 376315150 892498299

RXD-M47MP

EXTERNAL VIEW

Rear cabinet

(A80-4503-08)

Antenna cover

(F07-2029-08)

Speaker terminal

(E70-0196-08)

AC power cord

(E30-7343-08)

TEL 13942296513 QQ 376315150 892498299

RXD-M47MP

ADJUSTMENT

SERVICE ADJUSTMENT

Lubrication

The mechanical parts are factory coated with a thin coat of light grease and should not require further

lubrication. If a light grease is applied, be careful not to get any grease on the play/record head or erase

head, hubs, pulleys, tapes reels, drive belts, or switches. Use a good lubricant such as Silicon Lube G322L

or Lubricate.

Service Check

Before aligning the mechanism, wipe off any accumulated dirt with denatured alcohol. Wipe around parts

where the tape contacts and around all rotating parts. Drive belts are specially processed. Do not clean

them with alcohol.

Mechanical Torque

Use a cassette type torque gauge and check the tape mechanism.

Take-up torque 35 to 70 g-cm

Rewind torque 50 g-cm min.

Fast forward torque 50 g-cm min.

Pinch Wheel Pressure

No adjustment to the pinch roller spring is necessary. It should be sufficient to give at least 40 g-cm pull

force.

Tape Head Servicing

Each time the unit is serviced, the face of all heads should be thoroughly cleaned with denatured alcohol or

commercial head cleaning solution. The playback head should be demagnetized with a commercial

demagnetizer. Accumulation of tape oxide during normal operations can cause problems, including loss of

high frequencies and wow and flutter.

Erase Head

The erase head is properly aligned when the tape rides directly between the tape guide on the head without

crinkling the tape.

TEL 13942296513 QQ 376315150 892498299

RXD-M47MP

ADJUSTMENT

Play/Record and Playback Head Azimuth Adjustment

To adjust the play/record and playback head azimuth screw:

1. Connect two (2) VTVMs and a dual trace scope to the stereo headphone jack (as shown) with a 32

ohm dummy load. (See Figure 1.)

VTVM VTVM

DUMMY LOAD

JK801

SCOPE

CH1

CH2

Figure 1. Azimuth Adjustment

2. Insert a 10 kHz test tape (Teac MTT-1141V or Equivalent) into the tape mechanism and play it back.

3. While playing back the test tape, slowly turn the azimuth adjusting screw until the amplitude of both

channel output waveforms is maximum and in phase. (See Figure 2.)

4. Secure the azimuth screw in place with glue or paint after making the adjustment.

Figure 2. Head Output Signal

TEL 13942296513 QQ 376315150 892498299

RXD-M47MP

ADJUSTMENT

Tape Speed Adjustment

1. Set the function switch to TAPE.

2. Connect a frequency counter with a 32 ohm dummy load to the stereo headphone jack. (See Figure 3.)

FREQUENCY COUNTER

DUMMY LOAD

JK801

Figure 3. Tape Speed Adjustment

3. Insert and play back a 3 kHz test tape (Teac MTT-111 or Equivalent) into the tape mechanism.

4. Insert an insulated alignment tool and adjust the tape speed potentiometer (MOTOR) until the

frequency counter indicates 2940 Hz to 3090 Hz.

Bias Oscillator Frequency and Level Adjustment

1. Set the function switch to TAPE and the record and play tape mechanism to RECORD.

2. Connect a VTVM and frequency counter to test point R/P HEAD.

3. Adjust bias oscillator coil T360 until the frequency counter indicates 81 kHz ±0.5 kHz.

4. Confirm the record head voltage equal to: 6-12V.

5. Confirm the erase head voltage equal to: 15-24V.

TEL 13942296513 QQ 376315150 892498299

RXD-M47MP

ADJUSTMENT

TUNER ALIGNMENT PROCEDURE

Equipment needed:

1. AM Signal generator

2. FM Signal generator

3. DC Voltage meter

4. Oscilloscope

5. Output meter (VTVM)

AM Alignment

Step S/G Frequency Dial Setting Indicator Adjust Remarks

1 450 kHz (1 kHz 30% mod.) 612 kHz Connect

oscilloscope or

VTVM to speaker

jack

T201 Adjust until

maximum

output

2 531 kHz (1 kHz 30% mod.)

Low end Connect DC voltage

meter to test point Vt

and ground

T202 Adjust until

Vt equal to

1.5 ±0.05V

3 1602 kHz (1 kHz 30% mod.)

High end Same as step 2 Confirm Vt:

6.5~8.5V

4 612 kHz (1 kHz 30% mod.)

612 kHz

Same as step 1 T203 Maximum output

5 1404 kHz (1 kHz 30% mod.) 1404 kHz Same as step 1 VC201 Maximum output

6 Repeat steps 4 and 5 to minimize tracking error

7 999 kHz

(1 kHz 30%mod.)

999 kHz

Same as step 1 Offset is less than

6 dB.

60 cm

AM SIGNAL GENERATOR

AM LOOP ANT AM LOOP

ANTENNA

DUMMY LOAD

TEST UNIT

VTVM

R-OUT

L-OUT

GND

Figure 4. AM IF/RF Tracking

TEST UNIT

GROUND METER

Figure 5. AM Band Frequency Coverage Alignment

Vt DC

TEL 13942296513 QQ 376315150 892498299

RXD-M47MP

ADJUSTMENT

FM Alignment:

Figure 6. FM Band Frequency Coverage Alignment

Connect FM S/G to ANT inputs (mod 1 kHz 22.5kHz dev.)

Step S/G Frequency Dial Setting Indicator Adjust Remarks

1 87.5 MHz Low end Connect DC voltage

meter to test point Vt

and ground

L203 Adjust until Vt equal to:

1.5 ±0.05V

2 108 MHz High end Same as step 1 Confirm Vt: 7-9V

3 90.1 MHz 90.1 MHz Connect oscilloscope

or VT/VM to speaker

jack

L204 Adjust until Maximum

output

4 106.1 MHz 106.1 MHz Same as step 3 VC202 Adjust until maximum

output

5 Repeat steps 3 and 4 to minimize tracking error.

FM GENERATOR

DUMMY

ANTENNA

TP1

TEST UNIT

OSCILLOSCOPE

DUMMY LOAD

VTVM

R-OUT

L-OUT

GND

Figure 7. FM Band/Tracking

GROUND METER

Vt DC

TEST UNIT

TEL 13942296513 QQ 376315150 892498299

ACEBD

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

PC BOARD (Component side view)

U101

Q101

D107

Q106

Q104

LCD101

CN107

CN109

CN104

CN105

D102

D101

Q103 Q105

CN108

CN103

D103

CN101

CN102

CN106

DISPLAY

CN110

LED182

LED181

LED180

SW107

FRONT KEY

D106

Q182

Q181

Q180

SW113

SW102

SW101

CN112

SW100

SW108 SW103

SW110 SW111

SW106

CN111

SW104 SW109

SW105 SW112

D105

D104

U102

SW114 SW115 SW116 SW117 SW118

CN113

R143

R174

R144

R145

R101

R104

C104

R100

C108

R107

R135

R142

R140

R141

R139

R137

R138

R136

C121

C122

C107

100

8180

3031 C110

R110

R109

R108

R103

C102

C115

R120

R121

C113

R119

R118

R117

C112

R115

R125

R149

R113

R112

R148

R123

R124 C111

R128

R129

R130

R131

R132

R133

R134

C116

C119

C105

C016

R114

C114

C120

J21

R116

R122

J22

J18

R102

J19

J16

J20

J23

J24

J25

J10

R147

X102

X101

C101

C103

C109

J15

J12

J14

J17

J13

R146

L101

R111

J11

110

18 18 51

9161

EC EC

R150

R160

R169

R170

R171

R172

R151

R152R153

R154

R155

R168

R156

R164

R165

R167

R166

R159

R163

R162

R157

R158

R161

C118

C117

R180

R181

R182

R186

BEBE

C183

R185

R173

R183

R188

R184

POWER

RDS/

DISPLAY

C180

TIME SET TIMER ON/OFF REC

VOLUME UP

TAPE

IGO

VOLUME DOWN

TUNER

/BAND

EQ/BASS REPEAT PROG. PRESETDOWN PRESETUP

TOP KEY

TEL 13942296513 QQ 376315150 892498299

FGIHJ

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

PC BOARD

CN705

U703

U702

CN701

CN707

CN706

CN703 CN700

CN704

Q707

Q703

Q702

Q706 Q704

Q701

Q705

U705

U700

U701

U706

U704

MP3 (SIDE A)

MP3 (SIDE B)

ZD703

ZD702

ZD701

L703

L707

L701

L702

L706

X701

L704

C747

C779

C709 C710

GND1

C734

C754

C713

C707

C735

C733

C705

C770C722C723

C740

GND

C782

C780

C724

C704

C702 C715 C711

C708

C720 C719 C752

L708 L709

C768

C706

L710

C700

L705

R768

R769

R770

R771

R772

R760

R761

R762

R763

R764

R765

R766

R767

C766

C703

C701

R708

R706

R707 R750

C767

R774

R775

R776

R777

R778

R779

R780

R787

R788

R791

R792

C788

C791

R717

R759

C716 R790

R793

C778

GND

GND1

R748

R743

R747

R745

R739

R736

R737

R746

R744

R735

R785 R784

R782 C775

R781 R783

R718

R703

R704

R716

C750

R701

R741

C758

C756

R749

C745

C755

R751

C760

R773

R801

R720

C787

C758

C784

C786

C757

C726C730

C725

C771

C772

C773

C774

C776

C743C728

R727

C727

R721

C742

R726

C731

C732

C789

C729

R802

R734

C764

R757

R758

C761

R755

C762

R754

C765

R753

R752

C759

C763

R719

R800

R728

R795

R796

R798

R740

R797

C721

R756

R803

R804

C769

C712

R711

C714

C717

C718C783

C790

C753

R722

R723

R725C744

R724C749

C746

R738

R789

C737

C739

C741

C748

R786

R730

R729

C736

R731

R733

C738

R732

C781

R742

C751

R702

16 15

61 21

30 31

8081

100

14 8

OG I

131

TEL 13942296513 QQ 376315150 892498299

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