Kenwood HM-437WM Manual de usuario

COMPACT Hi-Fi COMPONENT SYSTEM

RXD-M47WM-H/M47WM-S

LS-M47WM-H/M47WM-S

SERVICE MANUAL

B51-5961-00 (K/K) 592

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-)

Phone jack

(E63-1365-08)

Power knob

(K29-8499-08)

Display/Rec. knob

(K29-8501-08)

Search knob

(K29-8503-08)

Cass lid ass’y *

(A53-)

Front cabinet *

(A60-)

Volume knob

(K29-8502-08)

CD/Tuner/Tape knob

(K29-8504-08)

EQ/Bass knob

(K29-8500-08)

*Refer to parts list on page 26.

Remote control unit (1)

(A70-1709-08): E type

(A70-1710-08): X type

AM loop antenna (1)

(T90-0908-08)

ANT TERMI CVR

(F07-2029-08)

Batteries (R6/AA) (2)

(–)

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.

When the power is on and TUNER input is

selected, press and hold down the button

for more than 2 seconds.

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-M47WM/LS-M47WM

ACCESSORIES / CAUTIONS

Accessories

Cautions

System configuration

SYSTEM RECEIVER SPEAKER

HM-437WM-H RXD-M47WM-H LS-M47WM-H

HM437WM-S RXD-M47WM-S LS-M47WM-S

RXD-M47WM/LS-M47WM

EXTERNAL VIEW

SPEAKERS

IMPEDANCE:

4Ω

AC ~

FM ANT

AM ANT

Rubber foot

(J02-1563-08)x4

Rear cabinet

(A80-4535-08) AM Antenna

(E40-8089-08)

Speaker terminal

(E70-0196-08)

AC power cord *

(E30-)

*Refer to parts list on page 26.

RXD-M47WM/LS-M47WM

DISASSEMBLY FOR REPAIR / BLOCK DIAGRAM

DISASSEMBLY INSTRUCTIONS

LEFT SURFACE RIGHT SURFACE

BOTTOM SURFACE BACK SURFACE

LUOKAN 1 LASERLAITE

KLASS 1 LASERAPPARAT

CLASS 1LASER PRODUCT

LASER KLASSE 1

APPAREIL A LASER DE CLASSE 1

MAN UFACTURED:

RISK OF ELECTRIC SHOCK

CAUTION

DO NOT OPEN

SPEAKERS

IMPEDANCE:

FMANT

AMANT

DETACH REAR CABINET FROM FRONT CABINET MUST BE REMOVED FROM 1 TO 10 SCREWS.

BLOCK DIAGRAM

MCU

U101

U103

M24C16

EEPROM

Q803

8.1V CD SUPPLY

TO: CD-PCB

TO: U601 SC7313S

TO: U301 AN7312E

TO: U201 TA2104AFN G

CPU

TO: U260TC9257F

U802 7812

12V

LCD

KEYMAP

REMOTE

SENSE

MUTE CUT

Q801 Q802

U601

SC7313S

AUDIO SIGNAL SOURCE SELECTOR

EQ MODE SEIECTOR

VOLUME CONTROL

RDS

U250 SC6579A

PLL CONTROL

FUNCTION CONTROL

U260 TC9257F G

TAPE PRE. AMP.

U301 AN7312E

ELECTRONICE

SWITCH

TRANSISTORS

LOGIC

CASS DECK

W991S-107G

RADIO SECTION

U201 SA2104S

IC601

CD DSP

TC94A14FA

IC602

CD RF

TA2157FN

CD MACHINE

TCP11TK2PX

IC604

MP3/WMA DECODE

TC94A34FG

IC603

CD MOTOR DRIVER

MM1669XH

IC607

LPF

SC1308LS

IC605

DAC

PT8211

FM ANT (PIG TAIL)

AM ANT

SOCKET

AUDIO AMP.

U801

BA5415A

D905-D908

F901 3.15A

14.5V MAIN SUPPLY

MAIN TRANSFORMER

T902

STANDBY

TRANSFORMER

D901-D904

DC 5V

CN801

32 ohm

HEADPHONE

JACK

REMOTE CONTROLLED

POWER SECTION

RY901

SDT-S-105LMR

POWER RELAY

4 ohm IMPEDANCE

AUDIO OUT

CD SECTION

PLAY OUT OF TAPE

AC PLUG

REC IN

RXD-M47WM/LS-M47WM

SAFETY

Important Note!!! Do the following safety checks after servicing this unit.

1. Remove all the externally connected test equipment and wires before testing the unit.

2. Use the safety test circuit as shown below.

3. Plug the power cord or unit to be tested into the test receptacle.

4. Switch the unit being tested to ON or PLAY.

5. Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit. Set the meter to a

high (150V AC) scale to avoid meter damage and then touch the points with the test probe.

If the meter reading indicates less than 3 volts on all test points, set the meter to a low (3V AC) scale

and repeat the test.

6. Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the

cause of the leakage, correct the problem, and repeat the safety test.

RXD-M47WM/LS-M47WM

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.

RXD-M47WM/LS-M47WM

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

RXD-M47WM/LS-M47WM

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 100 kHz ±0.5 kHz.

4. Confirm the record head voltage equal to: 4-8V.

RXD-M47WM/LS-M47WM

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

RXD-M47WM/LS-M47WM

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:

2.5 ±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

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