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

Altri manuali per NC-AA MDR-RF950

Indice

Altri manuali Sony Cuffia

Sony

Sony XBA-1iP Manuale utente

Sony

Sony STH40D Istruzioni operative

Sony

Sony XBA-4iP Manuale utente

Sony

Sony DRBT140Q - Bluetooth Wireless Stereo Headset Manuale utente

Sony

Sony WF-C500 Guida di riferimento

Sony

Sony DR-BT21G - Stereo Bluetooth Headset; Neckband... Manuale utente

Sony

Sony Walkman NW-WS623 Manuale utente

Sony

Sony WI-1000XM2 Guida di riferimento

Sony

Sony SBH54 Manuale utente

Sony

Sony YY2954 Manuale utente

Sony

Sony BTN200-DR Manuale utente

Sony

Sony MBH10 Manuale utente

Sony

Sony WH-CH700N Manuale utente

Sony

Sony MDR-XB950BT Manuale utente

Sony

Sony DR-BT101 Manuale utente

Sony

Sony WH-CH700N Guida di riferimento

Sony

Sony WF-1000XM3 Manuale utente

Sony

Sony WH-XB900N Guida di riferimento

Sony

Sony MDR-ZX330BT Manuale utente

Sony

Sony Walkman SRF-HM33 Manuale utente

Sony

Sony MDR-ZX780DC Manuale utente

Sony

Sony DR-EX300iP Manuale utente

Sony

Sony DR-E10iP - Entry-level Earbud With Ipod Manuale utente

Sony

Sony MDR-EX31BN Manuale utente

Manuali Cuffia popolari di altre marche

Sena

Sena SMH10 Manuale utente

IASUS

IASUS Stealth IA-NT4-BASIC-BT Manuale utente

Sennheiser

Sennheiser EPOS ADAPT 230 Manuale utente

Doro

Doro Flexus HS2005 Manuale utente

GE 98971 Manuale utente

Hama

Hama 00184070 Manuale utente

Plantronics

Plantronics Blackwire 3200 Series Manuale utente

Blue Tiger

Blue Tiger Advantage PLUS Manuale utente

Jawbone

Jawbone Icon Manuale utente

Jabra

Jabra FR 20 Manuale utente

Roxcore

Roxcore Flow A+ Manuale utente

Turtle Beach

Turtle Beach XP 510 Manuale utente

Philips

Philips SHB6101 Manuale utente

Jabra

Jabra PRO 9460 Duo Manuale utente

HyperX

HyperX HyperX Cloud Flight Manuale utente

Bose

Bose MIE2 Mobile Manuale utente

Jabra

Jabra Steel Manuale utente

HyperX

HyperX cloud ii Manuale utente