Sony TMRRF-960-R Service manual

TMR-RF960R

SERVICE MANUAL

Ver 1.0 2004. 02

TMR-RF960R is the component model block one in the MDR-RF960RK or MDR-RF920RK.

COMPONENT MODEL NAME FOR MDR-RF920RK/ MDR-RF960RK

US Model

Canadian Model

MDR-RF920RK MDR-RF960RK Wireless Stereo Headphones MDR-RF920R MDR-RF960R Transmitter TMR-RF960R TMR-RF960R

SPECIFICATIONS

General

Carrier frequency 913.5 – 914.5 MHz Channel Ch1, Ch2, Ch3 Modulation FM stereo Frequency response MDR-RF920R : 20 – 20,000 Hz

Transmitter

Power source DC 9 V: supplied AC power adaptor Audio input phono jacks/stereo mini jack Dimensions Approx. 133 x 124 x 136 mm

Mass Approx. 195 g (7 oz.)

MDR-RF960R : 10 – 22,000 Hz

(5 1/4 x 5 x 5 3/8 in.)

(w/h/d)

9-877-526-01

TRANSMITTER

Sony Corporation

Personal Audio Company Published by Sony Engineering Corporation

TMR-RF960R

SECTION 1

GENERAL

TABLE OF CONTENTS

Specifications ............................................................................ 1

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

2. DISASSEMBLY

2-1. Upper Cabinet Assy ...............................................3

2-2. TX-BASE Board .................................................... 3

3. ELECTRICAL ADJUSTMENTS ..........................4

4. DIAGRAMS

4-1. Block Diagrams...................................................... 5

4-2. Schematic Diagram – TX-BASE Board – .............6

4-3. Printed Wiring Board – TX-BASE Board –........... 7

4-4. Schematic Diagram – TX-VCO Board – ............... 8

4-5. Printed Wiring Board – TX-VCO Board – ............ 8

5. EXPLODEDVIEWS ..................................................10

6. ELECTRICAL PARTS LIST............................... 11

This section is extracted from instruction manual.

Setting up the transmitter

Connect the transmitter to audio/ video equipment.

Select one of the hookups below depending on the jack type:

A To connect to a headphones jack

CHANNEL

2 3

NOISE FILTER

OFF

INPUT

to INPUT B jacks

INPUT

DC IN 9V

Transmitter

Left channel (white)

Right channel (red)

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer.

1. Check the area of your repair for unsoldered or poorly-sol deredconnections. Check the entire board surface for solder splashes and bridges.

2. Check the interboard wiring to ensure that no wires are “pinched” or contact high-wattage resistors.

3. Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement.

4. Look for parts which, through functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement.

Connecting cord (supplied)

Unimatch plug adaptor (supplied)

to headphones jack (stereo phone jack)

WALKMAN*, TV, VCR, etc.

to headphones jack (stereo mini jack)

5. Check the B+ voltage to see it is at the values specified.

6. Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270°C

during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

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

2-1. UPPER CABINET ASSY

SECTION 2

DISASSEMBLY

upper cabinet ass

TMR-RF960R

2-2. TX-BASE BOARD

screw (DIA. 2)

TX-BASE board

four screws (DIA. 2)

protection sheet

cabinet (lower) assy

two screws (DIA. 2)

cabinet (lower) assy

TMR-RF960R

IC404

SECTION 3

ELECTRICAL ADJUSTMENTS

Setting :

AF signal generator

set

TMR-RF960R

L-CH (J402)

Telescopic antenna

Frequency counter

8 cm

set

TMR-RF960R

Transmission Frequency Check

1. Set the noise filter SW to OFF.

2. Input a signal of 1 kHz 40 mVrms to only the L-CH (J402).

3. Connect a telescopic antenna to the frequency counter input and extend the antenna to a length of approximately 8 cm.

4. Place TX-BASE board close to the frequency counter, then measure the frequencies of CH1, CH2 and CH3 and make sure the values are as follows:

CH1 : 913.5 MHz ± 200 kHz CH2 : 914.0 MHz ± 200 kHz CH3 : 914.5 MHz ± 200 kHz

Pilot signal Modulation Check and Adjustment

1. Set the channel to CH2.

2. An electric wave is output for 5 or 10 minutes when OFF to ON a power supply (LED (POWER) will ON).

3. Measure the center terminal of RV401 using an digital voltmeter (AC range) and make sure the value is 2.65 to

2.75mVrms. If the measured value is other than the specified value, adjust to 2.65 to 2.75mVrms by turning the RV401 on the TX-BASE board.

Connection points and Adjustment Location :

TX-BASE BOARD (Component side)

S402S401

3CH-2CH-1CH

CT501:Transmission

J402

(R-CH) (L-CH) CHANNNEL

frequency adjustment

RV401

When the frequency is not satisfied the specified value, set the channel switch (S402) to CH2, then adjust the value of the frequency counter to 914.0 MHz by CT501 in the TX-VCO BLOCK.

Standard value :913.9MHz to 914.1MHz

When completed with replacement, recheck the frequencies of CH1, CH2 and CH3.

Charge Current Check

1. Connect the ammmeter 3 and # probes to TP8 and 9.

2. The green LED (on charging) turns on. Make sure the reading on the current meter becomes to the standard value.

Standard value: 45±5mA

TX-BASE BOARD (Conductor side)

TX-VCO BLOCK

RV401: Modulation adjustment

TX-BASE BOARD (Conductor side)

digtal voltmeter

(AC range)

IC403

C454

X401

Q404

R460

C455

JW416

R469

JW401

C450

C488

IC402

R468

R464

RV401

R466

R405

C408

R402

R472

C457

C458

C480

D403

1-861-437-

TP8

TP9

CURRENT METER

4-1. BLOCK DIAGRAM

TX-BASE BOARD

TMR-RF960R

SECTION 4

DIAGRAMS

INPUT

J401

J402

R R-CH

R-CH

S401

NOISE FILTER

OFF

IC401

ALC

AMP

R-CH

IC403

STEREO MPX

LPF

Q408

R-CH

CH2

14 9

AMP

CH1

AMP

TIME

DEVISION

MPX

BUFFER

OSC AMP

X401

38kHz

BUFFER

DIVIDER

(19K)

IC405(1/2)

AMP

Q401

RECT

D404,405

INPUT

DET

RV401

PILOT SIGNAL MODULATION

Q403

COMPENSATION

TX-VCO BLOCK

MOD

MODULATOR

Q501,502

CT501

B+ 5V

CT501

TRANSMISSION

FREQUENCY

X501

1080MHz

RF AMP

Q503

ANT

IC402

S402

CHANNEL

B+ 5V

SYSTEM

CONTROL

IC404

+5V REG

REGULATOR

& RIPPLE FILTER

Q402

IC405(2/2)

COMPARATOR

(POWER ON/OFF)

D401

(POWER)

ANT401

SWITCH

Q404

Q406,407

CHARGE

DET

D402

(CHARGE)

CHARGE

CURRENT

LIMIT

Q405,410

D407

J403

DC IN 9V

–

BATTERY

CHARGE

TERMINAL

(TO MDR-RF920R/RF960R)

• R-ch is omitted due to same as L-ch

• Signal path.

L : AUDIO F : FM

+ 9 hidden pages