Sony MDR-RF915R, MDR-RF945R Service manual

Page 1

MDR-RF915R/RF945R

SERVICE MANUAL

Ver 1.0 2001. 05

Photo : MDR-RF945R

MDR-RF915R is the component model block one in the MDR-RF915RK. MDR-RF945R is the component model block one in the MDR-RF945RK.

COMPONENT MODEL NAME FOR MDR-RF915RK/ MDR-RF945RK

MDR-RF915RK MDR-RF945RK Wireless Stereo Headphones MDR-RF915R MDR-RF945 Transmitter TMR-RF915R TMR-RF945

US Model

Canadian Model

SPECIFICATIONS

Headphones

Power source DC 2.4 V: Built-in rechargeable battery Mass Approx. 240 g (8.5 oz.) incl.

built-in rechargeable battery

Built-in Ni-Cd rechargeable battery

Model name NC-AA Voltage 1.2 V Capacity 700 mAh

Design and specifications are subject to change without notice.

HEADPHONES

9-873-137-11

Sony Corporation

Personal Audio Company Shinagawa Tec Service Manual Production Group

Page 2

MDR-RF915R/RF945R

TABLE OF CONTENTS

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

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

2. DISASSEMBLY

2-1. RX-BASE Board ...................................................... 3

3-5. Free Run Frequency

Check and Adjustment (MRD-RF945R).........6

3-6. Receive Frequency

Check and Adjustment (MRD-RF945R)......... 6

3-7. Carrier Modulation Check (MRD-RF945R) ............... 6

3-8. Separation Check (MRD-RF945R) ............................. 6

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

3-1. Free Run Frequency

Check and Adjustment (MRD-RF915R) ....... 5

3-2. Receive Frequency

Check and Adjustment (MRD-RF915R) ....... 5

3-3. Carrier Modulation Check (MRD-RF915R) ............. 5

3-4. Separation Check (MRD-RF915R) ........................... 5

SECTION 1

GENERAL

- Turn up the volume to a moderate

level with the VOL control. Press the TUNING button briefly for automatic tuning of the headphones. If you do not receive a clear audio signal, press it again.

MDR-RF945RK

4. DIAGRAMS

4-1. Block Diagrams ........................................................... 8

4-2. Schematic Diagram ..................................................... 9

4-3. Printed Wiring Board................................................. 10

5. EXPLODED VIEWS........................................................11

6. ELECTRICAL PARTS LIST........................................12

This section is extracted from instruction manual.

Auto power on/off function

When you remove the headphones from your head, the power turns off automatically. Do not allow the self adjusting band to be pulled up, otherwise the headphones will be switched on.

TUNING button

VOL control

- Turn up the volume to a moderate

level with the VOL control, then tune the headphones in to the frequency o the transmitter with the TUNING control until you can hear the audio signal loud and clear.

MDR-RF915RK

TUNING control

VOL control

Try the above steps 3 and 5 until the receiving performance becomes better.

The power turns on.

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, particularlyt ransis tors, 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.

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

Page 3

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

2-1. RX-BASE BOARD

SECTION 2

DISASSEMBLY

Five screws (P 2

× 6)

MDR-RF915R/RF945R

Cover (R), hanger

Claw

Precaution for installtion

Slide the suspender in the

direction of the arrow.

Suspender

Set the psuh

switch (1 key).

(RF945R)

Switch, push (1 key)

Remove the two solderings.

Button, tuning

RX-BASE board

Remove the

nine solderings.

Claw

Screw (P 2

× 8)

Precaution for installtion

No.205

RX-BASE board

No.204

No.201

No.201 (green)

No.202

No.203

No.203 (black)

Solder the each lead wires directly to the position as shown while being cautions of colors.

No.204

No.202 (red)

Page 4

MDR-RF915R/RF945R

Set the lead wires

Set the each lead wires as illustrated below.

Cover (L), hanger

Groove

To the driver (030F032).

No.203

No.201

Groove

No.201, No.203

Groove

No.202

Groove

To the RX-BASE board

Cover (R), hanger

No.205

Groove

No.204

To the driver (030F032).

No.201

No.203

No.202

No.201, No.203

Cover (L), hanger

Groove

Cover (R), hanger

Page 5

SECTION 3

–+–

IC301 pin6

IC301 pin4

OSCILLOSCPE

CH1 CH2

MRD-RF915R

Notes:

1. Use transmitter with check and adjustment alreadycompleted.

2. On adjusting the headphones section, use the transmitter as a jig.

Headphones:MDR-RF915R Transmitter:TMR-RF915R

ELECTRICAL ADJUSTMENTS

MDR-RF915R/RF945R

Setting :

Procedure:

1. Connect an oscillator with attenuator and terminator (600 Ω)

2. Connect an AC adapter to the transmitter DC IN 9V jack (J404).

3. Connect a DC 2.4V to the +B power line externally.

4. Connect lead wires to IC301 pin 4, pin 6, pin 7 and GND on

5. Connect a resistor 33k Ω between IC301 pin 4 and pin 7.

6. Connect lead wires to the speakers’ terminals (L+,L-,R+,R-)

3-1. Free Run Frequency Check and Adjustment

1. Set the transmitter AUDIO IN-A connector (J402) to no signal.

Note: In this case, operation time is about 5 or 10 minutes.

2. Check the transmitter power indicator (red) lights.

3. Set the transmitter CHANNEL switch to 1.

4. Set the RV303 (TUNE) to the center position.

5. Connect a frequency counter to IC301 pin 4 and GND on the

6. When the frequency dose not satisfy the specified value, adjust

7. Remove a 33 Ω resister between IC301 pin 4 and pin 7.

Setting :

3-2. Receive Frequency Check and Adjustment

1. Set the transmitter CHANNEL switch to 2.

2. Set the transmitter NOISE FILTER switch to OFF.

3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-

4. Keep distance between transmitter and headphones to 5 meters

5. Set the headphones volume (RV302) to minimum.

6. Set the RV303 (TUNE) to the center position.

7. Connect an oscilloscope CH1 and CH2 to IC301 pin 6 and

8. Check the waveform of the oscilloscope to CH1 is demodulated

9. If CH1 and CH2 are not satisfied in step 8, adjust the coil (L301)

10. Set the transmitter CHANNEL switch to 1.

11. Adjust the RV303 (TUNE) to receive a signal.

12. Check same step 8.

13. Set the transmitter CHANNEL switch to 3.

14. Adjust the RV303 (TUNE) to receive a signal.

15. Check same step 8.

to the transmitter AUDIO IN-A connector (J402).

the RX-BASE board.

on the RX-BASE board.

Perform confirmation for less than 5 minutes.

RX-BASE board, then confirm the frequency within 76kHz ± 50Hz

the value of the frequency counter to specification by RV301 on the RX-BASE board.

Specified values: 76kHz ± 50Hz.

Frequency counter

+ –

IC301 pin

A(L-ch) connector only.

over.

pin 4.

1kHz signal and CH2 is GND.

on the RX board to satisfied step 8.

Confirm the signal with stereo.

3-3. Carrier Modulation Check

1. Set the transmitter CHANNEL switch to 2.

2. Set the transmitter NOISE FILTER switch to OFF.

3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A (L-ch) connector only.

4. Set the headphones volume (RV302) to minimum.

5. Connect an oscilloscope CH1 and CH2 to IC301 pin 6 and pin 4.

6. Adjust the tuning control (RV303) to receive radio frequency.

7. Check the waveform of the oscilloscope that the CH1 is demodulated 1kHz signal and CH2 is GND.

8. Connect an AC voltmeter with LPF to IC301 pin 6 and GND.

9. Check the value of the AC voltmeter to 26mVrms ± 2mV

Setting :

Digital voltmeter (AC range)

–

LPF

2.2K

33000P

IC301

pin6

OSCILLOSCPE

IC301 pin6

CH1 CH2

–+–

IC301 pin4

3-4. Separation Check

1. Set the transmitter CHANNEL switch to 2.

2. Set the transmitter NOISE FILTER switch to OFF.

3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A (L-ch) connector only.

4. Connect an oscilloscope CH1 to speakers terminal (L+,L-) and CH2 to IC301 pin 4 and GND.

5. Adjust the tuning control (RV303) to receive radio frequency.

6. Check the waveform of the oscilloscope that the CH1 is demodulated 1kHz signal and CH2 is GND.

7. Connect an AC voltmeter with LPF to speakers terminal (L+,L).

8. Adjust the value of the AC voltmeter to specification by headphones volume RV302.

Specified values: 155mVrms

9. Connect an AC voltmeter with LPF to speakersterminal (R+,R-).

10. Measure the value of the AC voltmeter.

11. Check the difference of the L and R to more than 20dB.

12. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A (R-ch) connector only.

13. Connect an AC voltmeter with LPF to speakers terminal (R+,R-).

14. Adjust the value of the AC voltmeter to specification by headphones volume RV302.

Specified values: 155mVrms

15. Connect an AC voltmeter with LPF to speakers terminal (L+,L-).

16. Measure the value of the AC voltmeter.

17. Check the difference of the L and R to more than 20dB.

Setting :

Digital voltmeter (AC range)

–

L+ / R+ L– / R–

OSCILLOSCPE

CH1 CH2

L+

–+–

L–

IC301 pin

Page 6

MDR-RF915R/RF945R

MRD-RF945R

Notes:

1. Use transmitter with check and adjustment alreadycompleted.

2. On adjusting the headphones section, use the transmitter as a jig.

Headphones:MDR-RF945R Transmitter:TMR-RF945R

Procedure:

1. Connect an oscillator with attenuator and terminator (600 Ω) to the transmitter AUDIO IN-A connector (J402).

2. Connect an AC adapter to the transmitter DC IN 9V jack (J404).

3. Short between Q303 corrector and GND on the RX board.

4. Connect a DC 2.4V to the +B power line externally.

5. Connect lead wires to IC301 pin 4, pin 6, pin 7 and GND on the RX-BASE board.

6. Connect a resistor 33k Ω between IC301 pin 4 and pin 7.

7. Connect lead wires to the speakers’ terminals (L+,L-,R+,R-) on the RX-BASE board.

3-5. Free Run Frequency Check and Adjustment

1. Set the transmitter AUDIO IN-A connector (J402) to no signal. Note: In this case, operation time is about 5 or 10 minutes.

Perform confirmation for less than 5 minutes.

2. Check the transmitter power indicator (red) lights.

3. Set the transmitter CHANNEL switch to 1.

4. Connect DC 1.2V across TP and GND.

5. Connect a frequency counter to IC301 pin 4 and GND on the RX-BASE board, then confirm the frequency within 76kHz ± 50Hz

6. When the frequency dose not satisfy the specified value, adjust the value of the frequency counter to specification by RV301 on the RX-BASE board.

Specified values: 76kHz ± 50Hz.

7. Remove a 33 Ω resister between IC301 pin 4 and pin 7.

Setting :

Regulated power supply (DC 1.2V)

–

OSCILLOSCPE

IC301 pin6

CH1 CH2

–+–

IC301 pin

3-6. Receive Frequency Check and Adjustment

1. Set the transmitter CHANNEL switch to 2.

2. Set the transmitter NOISE FILTER switch to OFF.

3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO INA(L-ch) connector only.

4. Keep distance between transmitter and headphones to 5 meters over.

5. Set the headphones volume (RV302) to minimum.

6. Set the RV303 (TUNE) to the center position.

7. Connect an oscilloscope CH1 and CH2 to IC301 pin 6 and pin 4.

8. Check the waveform of the oscilloscope to CH1 is demodulated 1kHz signal and CH2 is GND.

9. If CH1 and CH2 are not satisfied in step 8, adjust the coil (L301) on the RX board to satisfied step 8.

10. Open between Q303 corrector and GND on the RX board.

11. When the transmitter off, check the waveform of the oscilloscope as follows:

1.8V

GND

2-3sec

0.6V

12. Set the transmitter CHANNEL switch to 1.

13. Push the headphones tuning switch (S301) to receive radio frequency.

14. Check same step 8.

15. Set the transmitter CHANNEL switch to 3.

16. Push the headphones tuning switch (S301) to receive radio frequency.

17. Check same step 8.

Setting :

Regulated power supply (DC 1.2V)

–

OSCILLOSCPE

IC301 pin6

CH1 CH2

–+–

IC301 pin

3-7. Carrier Modulation Check

1. Set the transmitter CHANNEL switch to 2.

2. Set the transmitter NOISE FILTER switch to OFF.

3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A (L-ch) connector only.

4. Set the headphones volume (RV302) to minimum.

5. Connect an oscilloscope CH1 and CH2 to IC301 pin 6 and pin 4.

6. Push the headphone tuning switch (S301) to receive radio frequency.

7. Check the waveform of the oscilloscope that the CH1 is demodulated 1kHz signal and CH2 is GND.

8. Connect an AC voltmeter with LPF to IC301 pin 6 and GND.

9. Check the value of the AC voltmeter to 26mVrms ± 2mV

Setting :

Digital voltmeter (AC range)

–

LPF

2.2K

33000P

IC301

pin6

OSCILLOSCPE

IC301 pin6

CH1 CH2

–+–

IC301 pin4

3-8. Separation Check

1. Set the transmitter CHANNEL switch to 2.

2. Set the transmitter NOISE FILTER switch to OFF.

3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A (L-ch) connector only.

4. Connect an oscilloscope CH1 to speakers terminal (L+,L-) and CH2 to IC301 pin 4 and GND.

5. Push the headphones tuning switch (S301) to receive radio frequency.

6. Check the waveform of the oscilloscope that the CH1 is demodulated 1kHz signal and CH2 is GND.

7. Connect an AC voltmeter with LPF to speakers terminal (L+,L-).

8. Adjust the value of the AC voltmeter to specification by headphones volume RV302.

Specified values: 155mVrms

9. Connect an AC voltmeter with LPF to speakersterminal (R+,R-).

10. Measure the value of the AC voltmeter.

11. Check the difference of the L and R to more than 20dB.

12. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A (R-ch) connector only.

13. Connect an AC voltmeter with LPF to speakers terminal (R+,R-).

14. Adjust the value of the AC voltmeter to specification by headphones volume RV302.

Specified values: 155mVrms

15. Connect an AC voltmeter with LPF to speakers terminal (L+,L-).

16. Measure the value of the AC voltmeter.

Page 7

17. Check the difference of the L and R to more than 20 dB.

MDR-RF915R/RF945R

Digital voltmeter (AC range)

–

Asjustment Location :

TP(R312-C320)

GND

RV303(TUNE) (RF915R)

S301(TUNE) (RF945R)

L301: Receive frequency Adjustment

OSCILLOSCPE

L+ / R+ L– / R–

L+ L–

RX-BASE BOARD (Conductor side)

R340

C340

IC303

C337

C341

R347

R349

R346

R341

R345

R323

S301

CH1 CH2

–+–

CF301

R342

R344

C334

C344

JC302

R343

C316

C320

R312

JC324

IC301 pin

C309

R325

R326

C335

R308

C332

C315

D301

C336

C314

C313

L301

D304 power

JC305

R328

JC301

C367

L302

C355

R327

C312

C329

C331

C317

C319

JC335

D310

C303

C308

C306

C307

IC301

C363

R309

C333

C366

R330

Q304

R322

C302

R320

Q305

IC305

R318

JC303

R321

R314

C365

R302

C351

C301

R304

Q303

R348

R354

R331

R362

R363

R364

R361

R360

R332

C323

10 6

IC302

R333

C361

R310

C362

C350

C304

R353

R334

JC306

IC301

C305

C352

C343

R355

R367

C345

JC309

C364

IC301

R305

JC311

Q301

R352

R351

JC304

R358

IC304

R315

C357

R316

C328

C330

IC301

R366

C327

C311

C342

JC336

C326

JC332

GND

RV301

CF302

R350

R356

R357

C325

JC331

JC334

(Connect a 33 KΩ resistor)

RV301: Free Run Frequency Adjustment

C310

C347

C346

D303

C324

JC333

L–

L+

R–

R+

Short

+B power line (DC 2.4V)

RV302: Volume control

Page 8

MDR-RF915R/RF845R

4-1. BLOCK DIAGRAMS

RX-BASE BOARD

SECTION 4

DIAGRAMS

ANT301

FRONT END

FE UNIT

D301

RECEIVE

L301

FREQ.

RF915R

FM FE

RV303

TUNE

L302

RF945R

IC303

COUNTER

CF301

CF302

10.7MHz

REG

1316

OSC

Q301

FM IF/

DISCRI

SWITCH

Q303

AUTO

BLEND

MUTE

IF AMP/DECODE

IC301

PD1

COUNTER

FREE RUN

1/2

VCO

RV301

FREQ.

DECODE

AMP

MONO/ST

DETUNE

MUTE

STEREO

IND

TUNING

IND

RV302

VOL

6 2 5

R-CH

DETECT

IC304

IC305

Q305

RF945R

S301 TUNE

POWER AMP

IC302

MUTE

Q304

R-CH

ON/OFF SW

B+

D304

power

• Signal path. : FM

: AUDIO

• R-ch is omitted due to same as L-ch.

RECHAGEABLE BATTERY

(NICKEL-CADMIUM)

NC-AA

2PCS, 2.4V

SPEAKER

L-CH

SPEAKER

R-CH

CHARGE

TERMINAL

(TO TMR-RF915R/RF945R)

–

Page 9

4-2. SCHEMATIC DIAGRAM

C311

10 16V

C366

C303

4.7/16V

R302

2.2k

0.001

CXA1538N-T4

IC301

C302

0.47

0.9

C304

0.022

FREE RUN

FREQ.

0.9

0.8

C301

IF AMP/DET

RV301

4.7k

R310

3.3k

1.6

0.9

R304

3.3k

CF302

10.7MHz DISC

1.3

C305

0.022

MDR-RF915R/RF845R

RF915R

RV303

R308

C334

10k

TUNE

JC324

2.2k

R366

150

D303

UDZ 2.2B

C347

16V

C346

0.22

C340

R340

0.1

4.7k

R341 470k

2.0

IC303

TC74HC4024

2.0

RF945R

C337 100p

JC304

COUNTER

R342 240k

2.0

7.5k

R347

R348

47k

2.0

15k

R346

R320

FE UNIT

(FRONT END)

R343

2.0

30k

R345

120k

62k

R344

R350

R351

15k

C342

0.01

Q301

FMW1-T-148

OSC

0.5

R349

10k

C341

0.1

C333

RF915R

D301

HVU363ATRU

C312

3.3

50V

JC311

1.0

1.6

0.7

C351

R305

3.3k

C306

C320

0.1

R312

15k

68p

10p

C315

C314

0.01

C313

R309 100k

2.1

2.3

R330

C350

C308

16V

C307

0.01

RF945R

C316

16V

L301

AIR COIL

C333

1.2

16V

C310

C309

C317

C352

0.001

C336

56p

µH

C332

0.33

L302

50V

150

R326

0.01

C335

RF915R

RF945R

C319

56p

0.01

R331

2.2k

1.3

RF945R

R325 330

10.7MHz

RF945R

C331

C309

2.2 50V

1 50V

CF301

JC302

R323

4.7k

C355

0.001

1.3

C329

0.01

C331

0.01

(ANTENNA)

RF945R

R356

22k

JC303

R367

JC306

47k

R352

R353

15k

C343

0.01

IC304

0.4

0.6

2SC2712L

OSC SWITCH

2.4

BA10393F

0.9

Q303

22k

47k

ERROR AMP

R358

R355

1.2

1.0

R357

0.9

22k

R354

S301

TUNE

R332

1.0k FF

C345

0.1

IC305

2.3

2.4

2.3

C344

0.1

TC7W74FU

Q305

DTC114TK

BUFFER

JC301

JC305

2.3

R361

22k

R360

22k

R364

22k

R362

10k

0.6

2.3 R363

22k

RV302(1/2)

R327

33k

R328

33k

C367

0.001

(VOLUME)

C364

0.001

RV302(2/2)

C330

2.4

R333

2.2k

1.1

C361 100p

R334

2.2k 0

1.1

C362 100p

AUDIO AMP

IC302

LA4533MTP-1

RF945R

Q304

2SC2712L

AUDIO MUTE

16V

R318

2.3

0.1

47k

C323

0.1

R314 100k

2.3

1.1

JC309

1.1

2.4

RF915R

0.01

C345

0.01

C357

C324

6.3V

C325

JC331

220

6.3V

C326

JC332

220

6.3V

R316

R315

0.1

C327

JC334

JC333

C328

0.1

220

SLR-342VCTB7

D304

(power)

C365

0.001

RECHARGEABLE

(NICKEL-CADMIUM)

R321

1.5k

BATTERY

NC-AA

2pcs,2.4V

R322

6.8k

C363

0.01

JC336

JC335

D310

RB411D

N1-CD

SPEAKER

(L-ch)

SPEAKER (R-ch)

(POWER ON/OFF)

TMR-RF915R/RF945R

(BATTERY

CHARGE

TERMINAL)

• IC BLOCK DIAGRAMS

IC302 LA4533MTP-1

POWER

P/SW

IN1

PRE GND

IN2

REF

SWITCH

AMP1

BIAS

AMP2

MUTE

CIRCIUT

MT/SW

OUT1

POWER GND

OUT2

VCC

IC305 TC7W74FU

CLR

VCC

RSQ

QDC

3Q2

Note on schematic diagrams.

Note:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and 1/

• A : B+ Line.

• H : adjustment for repair.

• Power voltage is dc 2.4V and fed with regulated dc power supply

from battery terminal.

• Voltages are dc with respect to ground under no-signal conditions.

• Voltages are taken with a VOM (Input impedance 10 MΩ).

• Signal path.

F : FM L : AUDIO

GND

W or less unless otherwise specified.

Page 10

MDR-RF915R/RF845R

4-3. PRINTED WIRING BOARD

ANT301

RX-BASE BOARD (SIDE A)

(ANTENNA)

C309

RF945R

JC302

R325

R326

C335

C340

RF945R

R341

R340

CF301

R342

R343

IC303

R308

RV303

TUNE

RF915R

C337

C341

RF945R

S301

TUNE

R347

R349

R346

R345

R323

S301

R344

C334

C316

C344

C320

R312

JC324

D301

L301

JC305

R328

JC301

C332

C315

C336

C313

D304 power

L302

C314

C355

R327

C367

RF945R

3 4 5 6 7

C303

C308

C329

C331

C317

C312

C319

JC335

D310

C306

C307

IC301

C363

R330

R309

C333

C366

Q304

R322

C302

R320

Q305

IC305

R318

JC303

R321

R302

C301

R348

R331

R361

R360

R314

10 6

C365

R333

C351

R304

R310

Q303

R354

R362

R363

R364

R332

C323

IC302

C361

C362

C350

C304

R353

R334

C305

C352

C343

JC306

R367

C345

JC309

C364

R355

R305

RF945R

R352

JC304 R358

C357

R316

C328

JC311

Q301

R351

IC304

R315

C330

R366

C327

C311

C342

JC336

C326

JC332

RV301

CF302

R350

R356

R357

C325

JC331

JC334

C310

C346

FE UNIT

(FRONT-END)

C347

D303

C324

JC333

–

SPEAKER

–

(L-CH)

SPEAKER

(R-CH)

RX-BASE BOARD (SIDE B)

RV302

VOL

1-677-934-

RECHAGEABLE BATTERY

(NICKEL-CADMIUM)

NC-AA

2PCS, 2.4V

–

TO TMR-RF915R/RF945R (BATTERY CHARGE TERMINAL)

(11)

(POWER ON/OFF)

• Semiconductor

Location

Ref. No. Location

D301 C-2 D303 D-5 D304 D-3 D310 E-3

1-677-934-

9 10

(11)

Note:

• X : parts extracted from the component side.

• a : Through hole.

• : Pattern from the side which enables seeing.

(The other layer's patterns are not indicated.)

Caution:

IC301 B-3 IC302 E-4 IC303 C-2 IC304 D-4

Pattern face side: Parts on the pattern face side seen from the (Side B) pattern face are indicated. Parts face side: Parts on the parts face side seen from the (Side A) parts face are indicated.

IC305 D-4

Q301 C-4 Q303 C-4 Q304 D-3 Q305 C-3

Page 11

NOTE:

• -XX, -X mean standardized parts, so they may have some differences from the original one.

• Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items.

MDR-RF915R/RF945R

SECTION 5

EXPLODED VIEWS

• The mechanical parts with no reference number in the exploded views are not supplied.

• Hardware (# mark) list and accessories and packing materials are given in the last of this parts list.

1415

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

1 3-046-672-01 SUSPENDER 2 3-046-671-01 BAND, HEAD (RF945R) 2 3-046-671-11 BAND, HEAD (RF915R) 3 3-046-692-01 PAT, EAR 4 1-542-400-11 DRIVER (030F032)

5 3-046-685-01 PLATE (L), FRONT 6 3-046-675-41 HANGER (R) (RF915R:US) 6 3-046-675-51 HANGER (R) (RF915R:CND) 6 3-046-675-61 HANGER (R) (RF945R:US) 6 3-046-675-71 HANGER (R) (RF945R:CND)

8 4-992-281-01 HOLDER, BALL SHAFT 9 4-981-975-01 SPRING, TENSION

* 10 A-3062-556-A RX-BASE BORAD,COMPLETE (RF915R) * 10 A-3062-564-A RX-BASE BORAD,COMPLETE (RF945R)

11 3-046-677-01 COVER (R), HANGER (RF945R) 11 3-046-677-11 COVER (R), HANGER (RF915R) 12 3-049-799-01 LIGHT, MDR GUIDE 13 3-046-679-41 CAP (R), ORNAMENTAL (RF915R) 13 3-046-679-51 CAP (R), ORNAMENTAL (RF945R)

14 3-046-674-01 HANGER (L) (RF945R) 14 3-046-674-11 HANGER (L) (RF915R) 15 3-048-267-01 TERMINAL (MIDWAY), BATTERY 16 3-048-265-01 TERMINAL (+), BATTERY 17 3-048-266-01 TERMINAL (-), BATTERY

19 3-046-676-01 COVER (L), HANGER (RF945R) 19 3-046-676-11 COVER (L), HANGER (RF915R) 20 3-046-678-41 CAP (L), ORNAMENTAL (RF915R) 20 3-046-678-51 CAP (L), ORNAMENTAL (RF945R) 21 3-046-682-01 TERMINAL, CHARGE

22 3-046-680-01 BUTTON, TUNING (RF945R) 23 3-048-264-01 SHEET, ORNAMENTAL CAP ADHESIVE 24 3-223-909-01 SCREW (B2) 25 1-756-112-31 BATTERY, NICKEL CADMIUM 26 3-224-743-01 SHEET, HOLE (RF945R)

27 3-846-312-01 SPACER S1 1-771-249-11 SWITCH, PUSH (1 KEY) (POWER ON/OFF) #1 7-685-104-19 SCREW +P 2X6 TYPE2 NON-SLIT #2 7-685-105-19 SCREW +P 2X8 TYPE2 NON-SLIT

Page 12

MDR-RF915R/RF945R

RX-BASE

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

NOTE:

• Due to standardization, replacements in the parts list may be different from the parts specified in the diagrams or the components used on the set.

• -XX, -X mean standardized parts, so they may have some difference from the original one.

• Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items.

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

* A-3062-556-A RX-BASE BOARD, COMPLETE (RF915R)

ELECTRICAL PARTS LIST

• CAPACITORS:

uF: µF

• RESISTORS All resistors are in ohms. METAL: metal-film resistor METAL OXIDE: Metal Oxide-film resistor F: nonflammable

• COILS uH: µH

SECTION 6

• SEMICONDUCTORS

In each case, u: µ, for example: uA...: µA... , uPA... , µPA... , uPB... , µPB... , uPC... , µPC... , uPD..., µPD...

When indicating parts by reference number, please include the board name.

C335 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V

* A-3062-564-A RX-BASE BOARD, COMPLETE (RF945R)

*****************************

3-046-682-01 TERMINAL, CHARGE

< CAPACITOR >

C301 1-164-346-11 CERAMIC CHIP 1uF 16V C302 1-164-005-11 CERAMIC CHIP 0.47uF 25V C303 1-124-259-11 ELECT 4.7uF 20% 16V C304 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V C305 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V

C306 1-124-234-00 ELECT 22uF 20% 16V C307 1-163-059-91 CERAMIC CHIP 0.01uF 10% 50V C308 1-124-234-00 ELECT 22uF 20% 16V C309 1-104-942-11 ELECT 1uF 20% 50V

(RF945R)

C309 1-124-257-00 ELECT 2.2uF 20% 50V

(RF915R)

C310 1-104-942-11 ELECT 1uF 20% 50V C311 1-124-233-11 ELECT 10uF 20% 16V C312 1-126-162-11 ELECT 3.3uF 20% 50V C313 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C314 1-164-441-11 CERAMIC CHIP 68PF 5% 50V

C315 1-163-227-11 CERAMIC CHIP 10PF 0.50PF 50V C316 1-124-233-11 ELECT 10uF 20% 16V C317 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V C319 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C320 1-163-038-00 CERAMIC CHIP 0.1uF 25V

C323 1-163-038-00 CERAMIC CHIP 0.1uF 25V

(RF945R) C324 1-124-635-00 ELECT 220uF 20% 6.3V C325 1-124-635-00 ELECT 220uF 20% 6.3V C326 1-124-635-00 ELECT 220uF 20% 6.3V C327 1-163-038-91 CERAMIC CHIP 0.1uF 25V

C336 1-163-245-11 CERAMIC CHIP 56PF 5% 50V C337 1-163-251-11 CERAMIC CHIP 100PF 5% 50V

(RF945R)

C340 1-163-038-00 CERAMIC CHIP 0.1uF 25V

(RF945R)

C341 1-163-038-00 CERAMIC CHIP 0.1uF 25V

(RF945R)

C342 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V

(RF945R)

C343 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V

(RF945R)

C344 1-163-038-00 CERAMIC CHIP 0.1uF 25V

(RF945R)

C345 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V

(RF915R)

C345 1-163-038-00 CERAMIC CHIP 0.1uF 25V

(RF945R)

C346 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V

(RF945R)

C347 1-124-589-11 ELECT 47uF 20% 16V

(RF945R) C350 1-164-346-11 CERAMIC CHIP 1uF 16V C351 1-164-346-11 CERAMIC CHIP 1uF 16V C352 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V C355 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V

C357 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C361 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C362 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C363 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C364 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V

C365 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V C366 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V C367 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V

(RF945R)

C328 1-163-038-91 CERAMIC CHIP 0.1uF 25V C329 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C330 1-124-242-00 ELECT 33uF 20% 25V C331 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V

C331 1-164-346-11 CERAMIC CHIP 1uF 16V

C332 1-163-245-11 CERAMIC CHIP 56PF 5% 50V C333 1-163-220-11 CERAMIC CHIP 3PF 0.25PF 50V

C333 1-163-222-11 CERAMIC CHIP 5PF 0.25PF 50V

C334 1-164-346-11 CERAMIC CHIP 1uF 16V

(RF915R)

(RF945R)

(RF915R)

< CERAMIC FILTER >

CF301 1-577-588-11 FILTER, CERAMIC CF302 1-577-572-11 FILTER, CERAMIC

< DIODE >

D301 8-719-083-90 DIODE HVU363ATRU D303 8-719-056-71 DIODE UDZ-TE-17-2.2B (RF945R) D304 8-719-077-16 LED TLSU124(TPJ52) (power) D310 8-719-975-40 DIODE RB411D

< IC >

IC301 8-752-072-12 IC CXA1538N IC302 8-759-802-75 IC LA4533MTP

Page 13

MDR-RF915R/RF945R

RX-BASE

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

IC303 8-759-453-43 IC TC74HC4024AF (RF945R) IC304 8-759-510-73 IC BA10393F-E2 (RF945R) IC305 8-759-083-94 IC TC7W74FU (RF945R)

< JUMPER RESISTOR >

JC301 1-216-295-91 SHORT 0 JC302 1-216-295-91 SHORT 0 (RF945R) JC303 1-216-295-91 SHORT 0 JC304 1-216-295-91 SHORT 0 (RF945R) JC305 1-216-295-91 SHORT 0

JC306 1-216-295-91 SHORT 0 (RF945R) JC309 1-216-295-91 SHORT 0 JC311 1-216-295-91 SHORT 0 JC324 1-216-295-91 SHORT 0 (RF915R) JC331 1-216-295-91 SHORT 0

JC332 1-216-295-91 SHORT 0 JC333 1-216-295-91 SHORT 0 JC334 1-216-295-91 SHORT 0 JC335 1-216-295-91 SHORT 0 JC336 1-216-295-91 SHORT 0

< COIL >

L301 1-422-317-31 COIL, AIR-CORE L302 1-412-933-11 INDUCTOR 0.33uH

< TRANSISTOR >

Q301 8-729-903-10 TRANSISTOR FMW1-T-148 (RF945R) Q303 8-729-200-72 TRANSISTOR 2SC2712L-TE85L (RF945R) Q304 8-729-200-72 TRANSISTOR 2SC2712L-TE85L (RF945R) Q305 8-729-027-44 TRANSISTOR DTC114TKA-T146 (RF945R)

< RESISTOR >

R302 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R304 1-216-061-00 RES-CHIP 3.3K 5% 1/10W R305 1-216-061-00 RES-CHIP 3.3K 5% 1/10W R308 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R309 1-216-097-11 RES-CHIP 100K 5% 1/10W

R341 1-216-113-00 METAL CHIP 470K 5% 1/10W

(RF945R)

R342 1-216-106-00 METAL CHIP 240K 5% 1/10W

(RF945R)

R343 1-216-099-00 METAL CHIP 120K 5% 1/10W

(RF945R)

R344 1-216-092-00 RES-CHIP 62K 5% 1/10W

(RF945R)

R345 1-216-084-00 METAL CHIP 30K 5% 1/10W

(RF945R)

R346 1-216-077-00 RES-CHIP 15K 5% 1/10W

(RF945R)

R347 1-216-070-00 METAL CHIP 7.5K 5% 1/10W

(RF945R)

R348 1-216-089-91 RES-CHIP 47K 5% 1/10W

(RF945R)

R349 1-216-073-00 RES-CHIP 10K 5% 1/10W

(RF945R)

R350 1-216-077-00 RES-CHIP 15K 5% 1/10W

(RF945R)

R351 1-216-121-11 RES-CHIP 1M 5% 1/10W

(RF945R)

R352 1-216-121-11 RES-CHIP 1M 5% 1/10W

(RF945R)

R353 1-216-077-00 RES-CHIP 15K 5% 1/10W

(RF945R)

R354 1-216-081-00 METAL CHIP 22K 5% 1/10W

(RF945R)

R355 1-216-089-91 RES-CHIP 47K 5% 1/10W

(RF945R)

R356 1-216-081-00 METAL CHIP 22K 5% 1/10W

(RF945R)

R357 1-216-081-00 METAL CHIP 22K 5% 1/10W

(RF945R)

R358 1-216-081-00 METAL CHIP 22K 5% 1/10W

(RF945R)

R360 1-216-081-00 METAL CHIP 22K 5% 1/10W

(RF945R)

R361 1-216-081-00 METAL CHIP 22K 5% 1/10W

(RF945R)

R310 1-216-061-00 RES-CHIP 3.3K 5% 1/10W R312 1-216-077-00 RES-CHIP 15K 5% 1/10W R314 1-216-097-11 RES-CHIP 100K 5% 1/10W R315 1-216-001-00 METAL CHIP 10 5% 1/10W R316 1-216-001-00 METAL CHIP 10 5% 1/10W

R318 1-216-089-91 RES-CHIP 47K 5% 1/10W

(RF945R) R320 1-216-001-00 METAL CHIP 10 5% 1/10W R321 1-216-053-00 METAL CHIP 1.5K 5% 1/10W R322 1-216-069-00 METAL CHIP 6.8K 5% 1/10W R323 1-216-065-91 RES-CHIP 4.7K 5% 1/10W

(RF915R)

R325 1-216-037-00 METAL CHIP 330 5% 1/10W R326 1-216-029-00 METAL CHIP 150 5% 1/10W R327 1-216-085-00 RES-CHIP 33K 5% 1/10W R328 1-216-085-00 RES-CHIP 33K 5% 1/10W R330 1-216-001-00 METAL CHIP 10 5% 1/10W

R331 1-216-057-00 METAL CHIP 2.2K 5% 1/10W

(RF945R) R332 1-216-049-11 RES-CHIP 1K 5% 1/10W

(RF945R) R333 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R334 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R340 1-216-071-00 METAL CHIP 8.2K 5% 1/10W

(RF945R)

R362 1-216-073-00 RES-CHIP 10K 5% 1/10W

R363 1-216-081-00 METAL CHIP 22K 5% 1/10W

R364 1-216-081-00 METAL CHIP 22K 5% 1/10W

R366 1-216-029-00 METAL CHIP 150 5% 1/10W

R367 1-216-089-91 RES-CHIP 47K 5% 1/10W

< VARIABLE RESISTOR >

RV301 1-241-763-11 RES, ADJ, CARBON 4.7K (FREE RUN FREQ.) RV302 1-227-189-11 RES, VAR CARBON 20K/20K (VOL ) RV303 1-227-190-11 RES, VAR CARBON 10K (TUNE) (RF915R)

< SWITCH >

S301 1-771-980-11 SWITCH, TACTILE (TUNE) (RF945R)

(RF945R)

******************************************************

MISCELLANEOUS

*************

4 1-542-400-11 DRIVER (030F032) 25 1-756-112-31 BATTERY, NICKEL CADMIUM S1 1-771-249-11 SWITCH, PUSH (1 KEY) (POWER ON/OFF)

Page 14

MDR-RF915R/RF945R

REVISION HISTORY

Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page.

Ver. Date Description of Revision

1.0 2001.05 New

Page 15

MDR-RF915RK/RF945RK

SERVICE MANUAL

Ver 1.0 2001. 05

Photo : MDR-RF945RK

MDR-RF915RK and MDR-RF945RK are Composed of the following models. As for the service manual it is issued for each component model, then please refer to it.

COMPONENT MODEL NAME FOR MDR-RF915RK/ MDR-RF945RK

MDR-RF915RK MDR-RF945RK

Wireless Stereo Headphones MDR-RF915R MDR-RF945R

Transmitter TMR-RF915R TMR-RF945R

PARTS LIST

The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified.

Ref. No. Part No. Description Remark

0 1-473-588-12 ADAPTOR, AC (AC-S901)

1-473-606-11 ADAPTOR, PLUG

1-751-754-11 CORD, CONNECTION

3-233-607-11 MANUAL, INSTRUCTION

3-233-607-21 MANUAL, INSTRUCTION (ENGLISH, FRENCH)

Les composants identifiés par une marque ! sont critiques pour la sécurité. Ne les remplacer que par une pièce portant le numéro spécifié.

ACCESSORIES & PACKING MATERIALS

****************************

(Stereo mini jack t stereo phone plug)

(Phono plugs y stereo mini plug), 1m

(ENGLISH, SPANISH) (US)

(Canadian)

US Model

Canadian Model

SPECIFICATIONS

General

Carrier frequency

913.5 – 914.5 MHz Channel Ch1, Ch2, Ch3 Modulation FM stereo Frequency response

20 – 20,000 Hz

Transmitter TMR-RF945R, TMR-RF915R

Power source DC 9 V: supplied AC power adaptor Audio input phono jacks/stereo mini jack Dimensions Approx. 150 mm dia. 108 mm

Mass Approx. 190 g (6.7 oz.)

Headphones MDR-RF945R, MDR-RF915R

Power source DC 2.4 V: Built-in rechargeable

Mass Approx. 240 g (8.5 oz.) incl.

Built-in Ni-Cd rechargeable battery

Model name NC-AA Voltage 1.2 V Capacity 700 mAh

Design and specifications are subject to change without notice.

(6 4 x

built-in rechargeable battery

in.) (w/h)

battery

9-873-138-11

2001E0200-1

WIRELESS STEREO

HEADPHONE SYSTEM

Sony Corporation

Personal Audio Company

Shinagawa Tec Service Manual Production Group

Page 16

MDR-RF915RK/RF945RK

Setting up the transmitter

Connect the transmitter to audio/video equipment. Select one of the hookups below depending on the jack type:

To connect to a headphones jack

SECTION 1

GENERAL

- Turn up the volume to a moderate

This section is extracted from instruction manual.

level with the VOL control. Press the TUNING button briefly for automatic tuning of the headphones. If you do not receive a clear audio signal, press it again.

MDR-RF945RK

Transmitter

OFF ON

FILTERNOISE

Right channel (red)

Connecting cord (supplied)

Unimatch plug adaptor (supplied)

to headphones jack (stereo phone jack)

RBAL

AUDIO IN

to AUDIO IN

A jacks

DC IN 9V

123

CHANNEL

Left channel (white)

to headphones jack (stereo mini jack)

Discman, MD, WALKMAN*, VCR, etc.

TUNING button

VOL control

- Turn up the volume to a moderate

level with the VOL control, then tune the headphones in to the frequency o the transmitter with the TUNING control until you can hear the audio signal loud and clear.

MDR-RF915RK

TUNING control

VOL control

Try the above steps 3 and 5 until the receiving performance becomes better.

Auto power on/off function

When you remove the headphones from your head, the power turns off automatically. Do not allow the self adjusting band to be pulled up, otherwise the headphones will be switched on.

The power turns on.

Page 17

MDR-RF915RK/RF945RK

Page 18

MDR-RF915RK/RF945RK

REVISION HISTORY

Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page.

Ver. Date Description of Revision

1.0 2001.05 New

Page 19

TMR-RF915R/RF945R

SERVICE MANUAL

Ver 1.0 2001. 05

Photo : TMR-RF945R

TMR-RF915R is the component model block one in the MDR-RF915RK. TMR-RF945R is the component model block one in the MDR-RF945RK.

COMPONENT MODEL NAME FOR MDR-RF915RK/ MDR-RF945RK

MDR-RF915RK MDR-RF945RK

Wireless Stereo Headphones MDR-RF915R MDR-RF945

Transmitter TMR-RF915R TMR-RF945

US Model

Canadian Model

SPECIFICATIONS

General

Carrier frequency

913.5 – 914.5 MHz Channel Ch1, Ch2, Ch3 Modulation FM stereo Frequency response

20 – 20,000 Hz

Transmitter

Power source DC 9 V: supplied AC power

adaptor Audio input phono jacks/stereo mini jack Dimensions Approx. 150 mm dia X 108 mm

(6 X 41/3 in.) (w/h) Mass Approx. 190 g (6.7 oz.)

Design and specifications are subject to change without notice.

TRANSMITTER

9-873-139-11

2001E0200-1

Sony Corporation

Personal Audio Company

Shinagawa Tec Service Manual Production Group

Page 20

TMR-RF915R/RF945R

SECTION 1

GENERAL

TABLE OF CONTENTS

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

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

2. DISASSEMBLY

2-1. Cabinet (Upper) ........................................................ 3

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

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

4. DIAGRAMS

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

4-2. Schematic Diagram ................................................... 6

4-3. Printed Wiring Board ................................................ 7

5. EXPLODED VIEWS..................................................... 8

6. ELECTRICAL PARTS LIST...................................... 9

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:

To connect to a headphones jack

Transmitter

OFF ON

FILTERNOISE

Right channel (red)

RBAL

AUDIO IN

DC IN 9V

Left channel (white)

to AUDIO IN A jacks

123

CHANNEL

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, particularlyt ransis tors, 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)

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

to headphones jack (stereo mini jack)

Discman, MD, WALKMAN*, VCR, etc.

Page 21

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

)

2-1. CABINET (UPPER)

TMR-RF915R/RF945R

SECTION 2

DISASSEMBLY

Cabinet (upper)

Four screws (P 2

× 8

2-2. TX-BASE BOARD

TX-BASE board

Cabinet assy, lowe

Page 22

TMR-RF915R/RF945R

SECTION 3

ELECTRICAL ADJUSTMENTS

Setting :

AF signal generator

set

TMR-RF915R/RF945R

L-CH (J402)

Telescopic antenna

Frequency counter

8 cm

TMR-RF915R/RF945R

set

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 5or 10 minutes when OFF to ON a power supply (Power indicator will ON).

3. Measure the center terminal of RV403 using an digital volt-meter (AC range) and make sure the value is 2 to 2.5mVrms. If the measured value is other than the specified value, adjust to 2 to 2.5mVrms by turning the RV403 on the TX-BASE board.

Connection points and Adjustment Location :

TX-BASE BOARD

←

CH2 ←CH1

CH3

S402

RV403

(Component side)

(L-CH) (R-CH)

J402

VCO UNIT

Hole

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 trimmer capacitor in the VCO unit.

Standard value :913.9MHz to 914.1MHz

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

RV403: Modulation adjustment

TX-BASE BOARD

digtal voltmeter

(AC range)

C470

O401

UNIT)

(Conductor side)

417

420

R482

C439

R449

Trimmer : Transmission

C480

D403

R485

416

R486

R483

RV403

R464

JC470

frequency adjustmen

R484

IC402

413 JW

R472

1 2 3

R466

JC430

C468

Q404

C475

R481

415

Q408

R489

Page 23

4-1. BLOCK DIAGRAMS

TX-BASE BOARD

SECTION 4

DIAGRAMS

TMR-RF915R/RF945R

AUDIO IN

J401

J402

R R-CH

R-CH

S401

NOISE FILTER

OFF

NOISE

FILTER

IC401

ALC

AMP

LPF

R-CH

IC403

STEREO MPX

CH1

1 9

AMP

CH2

AMP

TIME

DEVISION

MPX

BUFFER

OSC

AMP

X401

38kHz

BUFFER

DIVIDER

B+ 5V

RV403

MODULATION

CHANNEL

SET

Q408

S402

CHANNEL

ANT401

ANT

MOD IN

VCO401

(VCO UNIT)

B+ 5V

IC402

+5V REG

D401

POWER

SWITCH

Q404

POWER ON/OFF

Q406,407

D402

CHG

J404

DC IN 9V

–

CHARGE

TERMINAL

(TO MDR-RF915R/RF945R)

• R-ch is omitted due to same as L-ch.

• Signal path.

L : AUDIO

F : FM

BUFFER

Q401

RECT

D404,405

Q402,405

INPUT

DET

Page 24

TMR-RF915R/RF945R

4-2. SCHEMATIC DIAGRAM • See page 7 for Notes.

AUDIO IN

JW407

J401

J402

R411

33k

R401

33k

R414

33k

JW401

JW402

R404

33k

S401

NOISE FILTER

OFF

R446

1.2k

C432

0.0056

R406

33k

R403

19KLPF

L408

JC404

JC405

R416

33k

R407

R413

R418

2.2k

R408

2.2k

C413

0.001

R417

R457

4.7k

R448

R449

22k

C433

C403

0.001

IC403

NJM2035M

MPX

JW404

0.022

C416

R423

220

C417

2.2 50V

R421 100k

R422

3.3k

L402

L401

C431

16V

R424

3.3M

C469

0.1

C421

16V

C458

16V

L405

C423

R481

5.6k

100p

C422

220 16V

R429

IC401

BA3308F

ALC

R425 100k

C441

16V

R430

10k

R469 180k

C457 330p

R426

3.3k

10k

JW405

JW403

R428 680

C406

0.022

R427

220 C407

2.2 50V

C426

0.01

D408

MTZ-77-2.0B

C466

0.01

JC470

C451

JC430

2SC2712L

220 16V

R432

2.2M

R431

4.7k

C425

0.022

C428 100p

Q401

C427

0.01

R440

R433

22k

R441

1.8k

R472

470

Q401,402

AUDIO INPUT

C430

4.7 16V

D404

1SS133T

C429 100p

DET

D405

1SS133T

C444 100p

C445 100p

R438 220k

R452

22k

2SC2712L

C436

10 16V

Q408

DTA124KA

CHANNEL

SET

R453 680k

Q402

R454

47k

Q405-407

POWER ON/OFF

Q405

KTA1266-GR

D410 MA77

Q407

2SC2712L

0.0033

C452

100 16V

C478

JW413

Q406

2SC2712L

D409 MA77

R455

VCO401 914MHZ

VCO UNIT

JW410

R466 22k

JW409

D406

RD5.1ES

L410

R467

4.7k

Q404

KTA1266-GR

POWER SWITCH

R489

18k

D401

SLR342VCT7

power

R473

620

0.1

C475

C468

0.01

+5V REG

JW411

IC402

KIA78S05

ANT401

(ANTENNA)

CHARGE

TERMINAL

MDR-RF915R/

RF945R

J404

DC IN 9V

RV403

MODULATION

L409

19KLPF

JC403

R474

620

R458

R461

4.7k

SLR342MGT

R459

D402

X401

C454 100p

C462

R479

1.2k

R478

1.2k

C453

16V

R477

1.2k

100p

R476

1.2k

R475

1.2k

C443

22k

chg

38K

C455

10p

C442

0.0056

R456

1.2k

–

D403

11ES2-TA1B

JW416

C480

0.01

RV403

4.7k

R464

R465

22k

R484

1.3k

R485

1.2k

C439

R483

2.2k

R486

18k

C440

100p

C483

JW415

C470

16V

S402

R482

22k

CHANNEL

Page 25

4-3. PRINTED WIRING BOARD

TMR-RF915R/RF945R

BATTERY CHARGE

TERMINAL

(TO MDR-RF915R

/RF945R)

3 4 5

ANT401

ANTENNA

DC IN 9V

JW417

R464

C433

R475

JC403

J404

C469

IC403

C462

C453

D403

JW416

RV403

C454

R467

C480

R485

R486

R483

JC470

C458

C457

X401

C455

JW411

S402

CHANNEL

1t2t3

JW415

JW413

Q408

R481

R469

C451

(11)

R484

IC402

1 2 3

R472

JC430

JW412

D408

Q404

R466

C468

C475

R489

• Semiconductor

Location

Ref. No. Location

D401 E-4 D402 E-4 D403 B-4 D404 E-2 D405 E-3

D406 D-3 D408 D-5 D409 D-4 D410 D-4

IC401 C-2 IC402 B-5 IC403 D-4

Q401 D-2 Q402 D-3 Q404 C-5 Q405 D-3 Q406 D-4

Q407 D-3 Q408 C-5

Note:

• X : parts extracted from the component side.

• : Pattern from the side which enables seeing.

Note on schematic diagrams.

Note:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and 1/

• A : B+ Line.

• H : adjustment for repair.

• Power voltage is dc 9V and fed with regulated dc power supply from external power voltage jack.

• Voltages are dc with respect to ground under no-signal conditions.

• Voltages are taken with a VOM (Input impedance 10 MΩ).

• Signal path.

F : FM L : AUDIO

W or less unless otherwise specified.

AUDIO IN

TX-BASE BOARD

S401

J401

B A

J402

NOISE FILTER

OFF

TON

R403

R413

JW401

C416

R423

R414

R407

R417

R404

C413

JW402

L402

R418

R406

L401

R416

C403

R411

R401

R408

C483

C407

L410

C470

JW420

IC401

C440

Q405

R453

Q407

R479

I (TP12)

R457

R461

JW410

D401

power

D402

chg

VCO401

(VCO UNIT)

R448

C452

C478

Q406

R473

R478

R474

R482

C439

R449

D410

D409

R476

R458

R459

C443

R477

JW409

R422

–

C426

C425

R429

R431 C427

C417

R421

Q401

C429

C466

JW404

C431

R430

JC405

C421

C428

R424

C422

JC404

R433

R432

C430

C423

R428

C445

L405

JW405

R440

C444

D404

R446

R456

D405

JW403

C441

L408

L409

C436

C442

R452

R438

R427

R426 C406 R425

C432

R455

Q402

JW407

R454

D406

R441

R465

1-682-266-

Page 26

TMR-RF915R/RF945R

SECTION 5

EXPLODED VIEWS

NOTE:

• -XX, -X mean standardized parts, so they may have some differences from the original one.

• Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items.

• The mechanical parts with no reference number in the exploded views are not supplied.

• Hardware (# mark) list and accessories and packing materials are given in the last of this parts list.

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

1 3-046-687-41 CABINET (UPPER) (RF915R) 1 3-046-687-51 CABINET (UPPER) (RF945R) 2 3-049-800-01 CUSHION, ANTENNA 3 3-046-690-01 TUBE, LIGHT GUIDE

* 4 A-3062-560-A TX-BASE MOUNTED PC BORAD (A)

5 X-3380-840-1 CABINET ASSY, LOWER (RF915R:US) 5 X-3380-841-1 CABINET ASSY, LOWER (RF945R:US)

5 X-3380-846-1 CABINET ASSY, LOWER (RF915R:CND) 5 X-3380-847-1 CABINET ASSY, LOWER (RF945R:CND) 6 4-984-729-01 FOOT, RUBBER

7 3-046-689-01 TERMINAL, CHARGE 8 4-213-164-01 TERMINAL, ANTENNA #1 7-685-105-19 SCREW +P 2X8 TYPE2 NON-SLIT

Page 27

TMR-RF915R/RF945R

SECTION 6

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

NOTE:

• Due to standardization, replacements in the parts list may be different from the parts specified in the diagrams or the components used on the set.

• -XX, -X mean standardized parts, so they may have some difference from the original one.

• Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items.

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

* A-3062-560-A TX-BASE BOARD, COMPLETE

ELECTRICAL PARTS LIST

• CAPACITORS: uF: µF

• RESISTORS All resistors are in ohms. METAL: metal-film resistor METAL OXIDE: Metal Oxide-film resistor F: nonflammable

• COILS uH: µH

C478 1-164-182-11 CERAMIC CHIP 0.0033uF 10% 50V

• SEMICONDUCTORS In each case, u: µ, for example: uA...: µA... , uPA... , µPA... , uPB... , µPB... , uPC... , µPC... , uPD..., µPD...

When indicating parts by reference number, please include the board name.

*********************

3-046-689-01 TERMINAL, CHARGE

C480 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C483 1-163-219-00 CERAMIC CHIP 2PF 50V

TX-BASE

< CAPACITOR >

C403 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V C406 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V C407 1-126-961-11 ELECT 2.2uF 20% 50V C413 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V C416 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V

C417 1-126-961-11 ELECT 2.2uF 20% 50V C421 1-124-234-00 ELECT 22uF 20% 16V C422 1-126-934-11 ELECT 220uF 20% 16V C423 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C425 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V

C426 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C427 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C428 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C429 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C430 1-124-259-11 ELECT 4.7uF 20% 16V

C431 1-126-157-11 ELECT 10uF 20% 16V C432 1-163-018-00 CERAMIC CHIP 0.0056uF 5% 50V C433 1-164-346-11 CERAMIC CHIP 1uF 16V C436 1-126-157-11 ELECT 10uF 20% 16V C439 1-164-346-11 CERAMIC CHIP 1uF 16V

C440 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C441 1-126-157-11 ELECT 10uF 20% 16V C442 1-163-018-00 CERAMIC CHIP 0.0056uF 5% 50V C443 1-164-346-11 CERAMIC CHIP 1uF 16V C444 1-163-251-11 CERAMIC CHIP 100PF 5% 50V

C445 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C451 1-126-934-11 ELECT 220uF 20% 16V C452 1-126-933-11 ELECT 100uF 20% 16V C453 1-126-157-11 ELECT 10uF 20% 16V C454 1-163-251-11 CERAMIC CHIP 100PF 5% 50V

C455 1-163-227-11 CERAMIC CHIP 10PF 0.50PF 50V C457 1-163-003-11 CERAMIC CHIP 330PF 10% 50V C458 1-126-157-11 ELECT 10uF 20% 16V C462 1-163-251-11 CERAMIC CHIP 100PF 5% 50V C466 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V

C468 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C469 1-163-038-00 CERAMIC CHIP 0.1uF 25V C470 1-126-786-11 ELECT 47uF 20% 16V C475 1-163-038-00 CERAMIC CHIP 0.1uF 25V

< DIODE >

D401 8-719-059-98 LED SLR-342VC3F (power) D402 8-719-048-87 LED SLR-332MGTB7 (chg) D403 8-719-200-82 DIODE 11ES2 D404 8-719-991-33 DIODE 1SS133T-77 D405 8-719-991-33 DIODE 1SS133T-77

D406 8-719-109-85 DIODE RD5.1ESB2 D408 8-719-109-51 DIODE RD2.0ESB2 D409 8-719-421-40 DIODE MA77 D410 8-719-421-40 DIODE MA77

< IC >

IC401 8-759-998-71 IC BA3308F IC402 8-759-537-90 IC KIA78S05P-TP IC403 8-759-667-59 IC NJM2035M(TE2)

< JACK >

J401 1-566-822-51 JACK (AUDIO IN (K)) J402 1-580-441-61 JACK, PIN 2P (AUDIO IN (A)) J404 1-785-066-11 JACK,DC(POLARITY UNIFIED TYPE) (DC IN 9V)

< JUMPER RESISTOR >

JC403 1-216-295-91 SHORT 0 JC404 1-216-295-91 SHORT 0 JC405 1-216-295-91 SHORT 0 JC430 1-216-295-91 SHORT 0 JC470 1-216-295-91 SHORT 0

< COIL >

L401 1-414-234-22 FERRITE 0uH L402 1-414-234-22 FERRITE 0uH L405 1-414-234-22 FERRITE 0uH L408 1-419-079-21 COIL (MPX FILTER) L409 1-419-079-21 COIL (MPX FILTER)

L410 1-419-662-12 COIL, AIR-CORE

< TRANSISTOR >

Q401 8-729-200-72 TRANSISTOR 2SC2712L-TE85L Q402 8-729-200-72 TRANSISTOR 2SC2712L-TE85L Q404 8-729-045-00 TRANSISTOR KTA1266GR-AT

Page 28

TMR-RF915R/RF945R

TX-BASE

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

Q405 8-729-045-00 TRANSISTOR KTA1266GR-AT Q406 8-729-200-72 TRANSISTOR 2SC2712L-TE85L

Q407 8-729-200-72 TRANSISTOR 2SC2712L-TE85L Q408 8-729-040-78 TRANSISTOR DTA124GKA-T146

R483 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R484 1-216-052-00 METAL CHIP 1.3K 5% 1/10W R485 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R486 1-216-079-00 RES-CHIP 18K 5% 1/10W R489 1-216-079-00 METAL CHIP 18K 5% 1/10W

< RESISTOR >

R401 1-216-085-00 RES-CHIP 33K 5% 1/10W R403 1-216-018-00 METAL CHIP 51 5% 1/10W R404 1-216-085-00 RES-CHIP 33K 5% 1/10W R406 1-216-085-00 RES-CHIP 33K 5% 1/10W R407 1-216-049-11 RES-CHIP 1K 5% 1/10W

R408 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R411 1-216-085-00 RES-CHIP 33K 5% 1/10W R413 1-216-018-00 METAL CHIP 51 5% 1/10W R414 1-216-085-00 RES-CHIP 33K 5% 1/10W R416 1-216-085-00 RES-CHIP 33K 5% 1/10W

R417 1-216-049-11 RES-CHIP 1K 5% 1/10W R418 1-216-057-00 METAL CHIP 2.2K 5% 1/10W R421 1-216-097-11 RES-CHIP 100K 5% 1/10W R422 1-216-061-00 RES-CHIP 3.3K 5% 1/10W R423 1-216-033-00 METAL CHIP 220 5% 1/10W

R424 1-216-133-00 RES-CHIP 3.3M 5% 1/10W R425 1-216-097-11 RES-CHIP 100K 5% 1/10W R426 1-216-061-00 RES-CHIP 3.3K 5% 1/10W R427 1-216-033-00 METAL CHIP 220 5% 1/10W R428 1-216-045-00 METAL CHIP 680 5% 1/10W

R429 1-216-073-00 RES-CHIP 10K 5% 1/10W R430 1-216-073-00 RES-CHIP 10K 5% 1/10W R431 1-216-065-91 RES-CHIP 4.7K 5% 1/10W R432 1-216-129-00 METAL CHIP 2.2M 5% 1/10W R433 1-216-081-00 METAL CHIP 22K 5% 1/10W

< VARIABLE RESISTOR >

RV403 1-241-763-11 RES, ADJ, CARBON 4.7K (MODULATION)

< SWITCH >

S401 1-771-961-11 SWITCH, SLIDE (NOISE FILTER) S402 1-771-962-11 SWITCH, SLIDE (CHANNEL)

< VIBRATOR >

X401 1-781-850-11 VIBRATOR, CRYSTAL

******************************************************

R438 1-216-105-91 RES-CHIP 220K 5% 1/10W R440 1-216-049-11 RES-CHIP 1K 5% 1/10W R441 1-216-055-00 METAL CHIP 1.8K 5% 1/10W R446 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R448 1-216-049-11 RES-CHIP 1K 5% 1/10W

R449 1-216-081-00 METAL CHIP 22K 5% 1/10W R452 1-216-081-00 METAL CHIP 22K 5% 1/10W R453 1-216-117-00 METAL CHIP 680K 5% 1/10W R454 1-216-089-91 RES-CHIP 47K 5% 1/10W R455 1-216-049-11 RES-CHIP 1K 5% 1/10W

R456 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R457 1-216-065-91 RES-CHIP 4.7K 5% 1/10W R458 1-216-049-11 RES-CHIP 1K 5% 1/10W R459 1-216-081-00 METAL CHIP 22K 5% 1/10W R461 1-216-065-91 RES-CHIP 4.7K 5% 1/10W

R464 1-216-049-11 RES-CHIP 1K 5% 1/10W R465 1-216-081-00 METAL CHIP 22K 5% 1/10W R466 1-216-081-00 METAL CHIP 22K 5% 1/10W R467 1-216-065-91 RES-CHIP 4.7K 5% 1/10W R469 1-216-103-00 METAL CHIP 180K 5% 1/10W

R472 1-216-041-00 METAL CHIP 470 5% 1/10W R473 1-216-044-00 METAL CHIP 620 5% 1/10W R474 1-216-044-00 METAL CHIP 620 5% 1/10W R475 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R476 1-216-051-00 METAL CHIP 1.2K 5% 1/10W

R477 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R478 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R479 1-216-051-00 METAL CHIP 1.2K 5% 1/10W R481 1-216-067-00 METAL CHIP 5.6K 5% 1/10W R482 1-216-081-00 METAL CHIP 22K 5% 1/10W

Page 29

TMR-RF915R/RF945R

Page 30

TMR-RF915R/RF945R

REVISION HISTORY

Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page.

Ver. Date Description of Revision

1.0 2001.05 New