Sony NC-AA MDR-RF950 Manuale utente

MICROFILM

SERVICE MANUAL

WIRELESS STEREO HEADPHONES

US Model

Canadian Model

SPECIFICATIONS

MDR-RF950

MDR-RF950 is headphones

in MDR-RF950RK. TABLE OF CONTENTS

1. GENERAL ................................................................. 2

2. DISASSEMBLY ......................................................... 3

3. ELECTRICAL ADJUSTMENTS

3-1. Checking/Adjusting Receiving Frequency..................... 5

3-2. Checking/Adjusting Degree of Modulation

of Main Carrier (L + R) .................................................. 6

3-3. Checking/Adjusting Separation ...................................... 7

4. DIAGRAMS

4-1. Printed Wiring Boards..................................................... 11

4-2. Schematic Diagram ......................................................... 13

5. EXPLODED VIEWS................................................ 15

6. ELECTRICAL PARTS LIST ............................... 17

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

Ver 1.0 1998. 06

– 2 –

SECTION 1

GENERAL

This section is extracted from

instruction manual.

– 3 –

FRONT PLATE ASSY

RX-BASE BOARD

Note: Follow the disassembly procedure in the numerical order given.

SECTION 2

DISASSEMBLY

• This set can be disassembled in the order shown below.

SET FRONT PLATE ASSY RX-BASE BOARD SW BOARD

HANGER COVER (L)

Remove two solders

of driver lead.

ear pad

front plate assy

three screws

(P2

hanger cover (R)

RX-BASE board

Remove four solders

of leads.

two screws

(P2

two screws

(P2

10)

Remove three solders

of leads.

– 4 –

SW BOARD

HANGER COVER (L)

screw (P2

switch support

SW board

head cushion ass

two head bands

hanger cover (L

)

Remove two solders

of battery lead.

two screws

(P2

two screws

(P2

10)

– 5 –

Note:

1. The adjustments should be performed in the order given.

2. The transmitter (TMR-RF950R) already checked and adjusted should be used.

3-1. Receiving Frequency Check and Adjustment

Preparation:

Procedure:

1. Set the channel of the transmitter to CH2.

2. Turn OFF the noise filter switch on the transmitter.

3. Enter 1 kHz 316 mVrms signal only to the Lch on the transmitter.

4. Place the transmitter away from the headphone (MDR-RF950) more than 5 m.

5. Set the volume control (RV301) on the RX-BASE board to the minimum position.

6. Set the tuning control (RV302) on the RX-BASE board to the center position.

7. Connect a DC voltmeter and an oscilloscope between IC301 pin @¡ and ground on the RX-BASE board.

8. After confirming that demodulated 1 kHz waveform (about 13 mV) appears on the oscilloscope, check that the DC voltmeter indicates

DC1 V to 1.2 V.

9. If demodulated 1 kHz waveform does not appear on the oscilloscope, or if the voltage is out of the specified value, adjust the air-core

coil (L301) on the RX-BASE board so that the demodulated 1 kHz waveform appears on the oscilloscope, and under this condition,

adjust finely the air-core coil (L301) so that the DC voltmeter indicates DC1.1 V.

10. Finally, check that signals are received when the channel is changed over to CH1/CH3 on the transmitter, then when the tuning control

(RV302) on the RX-BASE board is rotated.

Adjustment Location: RX-BASE board (See page 9.)

SECTION 3

ELECTRICAL ADJUSTMENTS

AF OSC

ATT

AUDIO IN (Lch)

1 kHz 316 mVrms

600

Ω

Trans-

mitter Head-

phones

–+

–

TMR-RF950R 5 m MDR-RF950

–

oscilloscope

DC voltmeter

[RX-BASE board] – Conductor Side –

– 6 –

3-2. Degree of Modulation of Main Carrier (L + R) Check and Adjustment

Preparation:

Procedure:

1. Set the channel of the transmitter to CH2.

2. Turn OFF the noise filter switch on the transmitter.

3. Enter 1 kHz 316 mVrms signal only to the Lch on the transmitter.

4. Set the volume control (RV301) on the RX-BASE board to the minimum position.

5. Connect an AC voltmeter and an oscilloscope between IC 301 pin @¡ and ground on the RX-BASE board.

6. Rotating the tuning control (RV302) on the RX-BASE board, receive signals.

7. After confirming that demodulated 1 kHz waveform appears on the oscilloscope, check that the AC voltmeter indicates 12 mVrms to

15 mVrms.

8. If out of the specified value, rotate RV404 on the TX-BASE board in the transmitter (TMR-RF950R) so as to attain 13.5 mVrms.

Adjustment Location: TX-BASE board in the transmitter (TMR-RF950R) (See page 8.)

AF OSC

ATT

AUDIO IN (Lch)

1 kHz 316 mVrms

600

Ω

Trans-

mitter Head-

phones

–+

–

TMR-RF950R MDR-RF950

–

oscilloscope

AC voltmeter

[RX-BASE board] – Conductor Side –

– 7 –

3-3. Separation Check and Adjustment

Preparation:

Procedure:

1. Set the channel of the transmitter to CH2.

2. Turn OFF the noise filter switch on the transmitter.

3. Enter 1 kHz 316 mVrms signal only to the Lch on the transmitter.

4. Connect an AC voltmeter and an oscilloscope to the Lch speaker output (both ends of MDD01) on the RX-BASE board.

5. Rotating the tuning control (RV302) on the RX-BASE board, receive signals.

6. Adjust the volume control (RV301) on the RX-BASE board so that the Lch speaker output (both ends of MDD01) on the RX-BASE

board becomes 155 mVrms.

7. Connect an AC voltmeter and oscilloscope to the Rch speaker output (both ends of MDD02) and measure voltage.

8. Check that a difference in speaker output level between Lch and Rch (i. e., separation) is over 20 dB. If not over 20 dB, rotate RV303

on the RX-BASE board to minimize the Rch output, then reconfirm that a difference in speaker output level between Lch and Rch is

over 20 dB.

9. Enter 1kHz 316 mVrms signal only to the Rch on the transmitter.

10. Adjust the volume control (RV301) on the RX-BASE board so that the Rch speaker output (voltage across MDD02) on the RX-BASE

board become 155 mVrms.

11. Connect an AC voltmeter and oscilloscope to the Lch speaker output (both ends of MDD01) and measure voltage.

12. Check that a difference in speaker output level between Lch and Rch (i.e., separation) is over 20 dB.

Adjustment Location: RX-BASE board (See page 9.)

–

oscilloscope

AC voltmeter

[RX-BASE board] – Conductor Side –

AF OSC

ATT

AUDIO IN (Lch or Rch)

1 kHz 316 mVrms

600

Ω

Trans-

mitter Head-

phones

–+

–

TMR-RF950R MDR-RF950

–

– 8 –

Adjustment Location:

Transmitter (TMR-RF950R)

RV404

Degree of

Modulation of

Main Carrier (L + R)

Adjustment

NOISE FILTER

OFF

J402

(Rch) J403

(Lch)

S402

CHANNEL

CH1

CH2

CH3

S401

[TX-BASE board] – Component Side –

– 9 – – 10 –

SECTION 4

DIAGRAMS

Headphone (MDR-RF950)

L301

Receiving Frequency

Adjustment

RV301

VOL

RV302

TUNING

MAX

MIN

[RX-BASE board] – Component Side –

IC301

RV303

Separation Adjustment

[RX-BASE board] – Conductor Side –

POWER

SWITCH MUTE

BIAS

AMP

5 6

10 MUTE

R-OUT

GND

L-OUT

VCC

PWR

R-IN

GND

L-IN

REG

• IC Block Diagrams

IC301 CXA1611N-T4

IC302 LA4533M

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