Sony MDRRF-430 Service manual

Page 1

MDR-RF430/RF450

SERVICE MANUAL

Ver 1.1 2000.12

Illustration : MDR-RF430

MDR-RF430 is the component model block one in the MDR-RF430RK. MDR-RF450 is the component model block one in the MDR-RF450RK.

COMPONENT MODEL NAME FOR MDR-RF430RK/RF450RK

MDR-RF430RK MDR-RF450RK

Wireless Headphones MDR-RF430 MDR-RF450

Transmitter TMR-RF450R TMR-RF450R

AEP Model

Illustration : MDR-RF450

SPECIFICATIONS

Headphone

Charging and using hours Approx. charging hours Approx. using time* 1 50 minutes 24** 20 hours

* at 1kHz 1mW + 1mW output ** the hours required to fully charge empty batteries

Battery life Battery Approx. hours* Sony alkaline battery LR6 (SG) 60 Sony battery R6P (SR) 30

* at 1kHz 1mW + 1mW output Power source DC 3V : 2 x R6 (size AA) battery or 2 x supplied

Mass Approx. 215g (7.6oz.) incl.Ni-Cd batteries (MDR-RF430RK)

Supplied Ni-Cd rechargeable batteries Model name NC-AA-HJ Voltage 1.2V Capacity 600mAh

Design and specifications are subject to change without notice.

NC-AA-HJ Ni-Cd rechargeable battery

Approx. 265g (9.4oz.) incl.Ni-Cd batteries (MDR-RF450RK)

WIRELESS STEREO HEADPHONES

MICROFILM

Page 2

SECTION 1

)

DISASSEMBLY

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

MDR-RF430 1-1. RX BOARD, FE BOARD, RECEIVER (R-CH), SUSPENDER REMOVAL

Head band

RX board

FE board

Screw

(M1.7x4)

Spacer

!¶

Suspender

Hanger (R)

Hanger cover (R)

RX shield plate

Remove

solder

SW1

!™

Screw

+P 2x6

!º

!¡

!£

Ball shaft holder

MDD02 (R-CH)

Screws +P 2x5

Housing (R) assy

!∞

1-2. BATTERY CASE, RECEIVER (L-CH), SUSPENDER REMOVAL

Head band

Screws +P 2x10

!¢

Screw (M 1.7x4)

!§

Remove solder

Ear pa

Battery cover

Screw (M 1.7x4)

Ear pad

Screws +P 2x10

MDD01 (L-CH)

Suspender

Screws +P 2x5

!º

!¡

Remove solder

!™

Housing (L) assy

– 2 –

Ball shaft holder

Hanger (L)

Screw +P 2x6

Battery case

Hanger cover (L

Page 3

MDR-RF450

1-1. RECEIVER (R-CH), RX BOARD, FE BOARD, SUSPENDER ASSY REMOVAL

Head band

!£

Remove

Hanger (R)

solder

RX board

Surpport switch

!¶

board

Housing (R)

RX shield plate

MDD02 (R-CH)

!¢

FE board

Remove

solder

Front plat (R) assy

!™

!¡

Screw (M1.7x4)

Claw

Screws

(M 1.7x4)

1-2. RECEIVER (L-CH), SUSPENDER ASSY REMOVAL

Head band

!∞

!§

Screws (M1.7x4)

Suspender

Screws +P 2x8

Hanger cover (R)

Ear pad

Suspender

Screws +P 2x8

Screws (M 1.7x4)

MDD01 (L-CH)

Claw

Screws

(M 1.7x5) tapping

Hanger cover (L)

!™

!¡

Remove solder

Front plate (L) assy

Battery cove

Hanger (L)

Housing (L)

– 3 –

Page 4

SECTION 2

ELECTRICAL ADJUSTMENTS

Note :

1. Use transmitter with check and adjustment already completed.

2. The transmitter section adjustments should be completed before performing the headphones section adjustment.

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

Headphones Transmitter MDR-RF430 MDR-RF450

Setting :

AF OSC

1. Feed a signal to jig (transmitter) and connect a power supply to DC IN 9V jack (J404).

TMR-RF450R

L-CH (J403) 1kHz 316mVrms (–7.8dB)

ATT

600

Ω

Jig

Transmitter

J404

power supply

(DC 11V)

Separation check and adjustment

1. Set the transmitter channel to CH2.

2. Set the transmitter noise filter SW to OFF .

3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-c h (J403).

4. Connect an digital voltmeter (AC range) and oscilloscope to the L-ch speaker outputs (both sides of MDD01).

5. Receive signals b y turning the TUNING V OL (RV302).

6. Adjust the VOL (RV301) so that the RX boar d L-c h speaker outputs (both sides of MDD01) are 155mVrms.

7. Connect an digital voltmeter (AC range) and oscilloscope to the R-ch speaker outputs (both sides of MDD02) and measure the voltages.

8. At this time, check to make sure the level separation of L-ch and R-ch speaker outputs is more than 20dB. If the separation is less than 20dB, turn R V303 on the RX boar d so that the R-c h output is minimal, then check to see if the level separation of Lch and R-ch speaker outputs is more than 20dB.

9. Input a signal of 1kHz 316mVrms to onl y the transmitter R-c h (J402).

10. Adjust the V OL (RV301) so that the RX boar d R-c h speaker outputs (both sides of MDD02) are 155mVrms.

11. Connect an digital voltmeter (AC range) and oscilloscope to the L-ch speaker outputs (both sides of MDD01) and measure the voltages.

12. At this time, check to make sure the level separation of L-ch and R-ch speaker outputs is more than 20dB.

Receive frequency check and adjustment

1. Set the transmitter channel to CH2.

2. Set the transmitter noise filter SW to OFF .

3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-c h (J403).

4. Place transmitter and headphones at a distance of more than 5m apart.

5. Set the V OL (RV301) to MIN.

6. Position RX boar d TUNING V OL (RV302) to the center .

7. Connect a digital voltmeter (DC range) and an oscilloscope between IC301 pin @¡ and GND.

8. First check to make sure that a demodulated waveform of 1kHz (appr oximatel y 13mVrms) is outputted to the oscilloscope , then chec k to make sure the DC v oltmeter reading is DC 1–1.2V .

9. If a demodulated waveform of 1kHz is not outputted to the oscilloscope or if the DC level is not within the range specified above, adjust the RX board L301 so that a demodulated waveform of 1kHz is outputted to the oscilloscope and while the waveform is outputted, further fine adjust the L301 so that the DC voltmeter reading is DC 1.1V .

10. When completed, make sure signals can be received when switching the transmitter channel to CH1 or CH3 by turning RX board TUNING V OL (RV302).

Connection points and Adjustment Location :

RX board (See page 5)

Connection points and Adjustment Location :

RX board (See page 5)

– 4 –

Page 5

POWER SWITCH

MUTE

CIRCIUT

BIAS

MT/SW

OUT1

POWER GND

OUT2

VCC

P/SW

IN1

PRE GND

IN2

REF

AMP2

AMP1

SECTION 3

DIAGRAMS

Connection points :

digital voltmeter

(AC range)

oscilloscope

digital voltmeter

(DC range)

oscilloscope

[ RX BOARD ] (Conductor side)

IC BLOCK DIAGRAMS

IC301 CXA1611N-T4

DETUNE DET

CONTROL

24 23 22 21 20 19 18 17 16 15 14 13

1 2 3 4 5 6 7 8 9 10 11 12

DETUNE DET

VCC

GND

FM DISCRI

RIPPLE FILTER

DET OUT

DET•AGC

AFC

AM OSC

FM•IF

DISCRI

AM•IF

AFC AGC

FM OSC

AFC AGC

TUNING

METER

DETUNE

DET

REG OUT

AM IF OUT

FM RF

FM•FE

GND

AM RF IN

RIPPLE FILTER

AM•FE

METER

FM IF IN

REGULATOR

FM RF IN

AM IF IN

GND

FM/AM

BAND SELECT

FM/AM

FE OUT

Adjustment Location :

IC302 LA4533M

[RX BOARD] (Component side)

RV302 Tuning Knob

RV301 VOL Knob

RV303 : Separation Adjustmen

L301 : Receive Frequency Adjustment

– 5 – – 6 –

Page 6

Page 7

3-2. SCHEMATIC DIAGRAM

Refer to page 6 for IC Block Diagrams.

MDR-RF430/RF450

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/ specified.

•

• U : B+ Line.

• H : adjustment for repair.

• Power voltage is dc 3V and fed with regulated dc power

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

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

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

: internal component.

supply from battery terminal. conditions. Voltage variations may be noted due to normal produc-

tion tolerances. Voltage variations may be noted due to normal produc-

tion tolerances.

W or less unless otherwise

WA VEFORM

10mVp-p

sec

20.4

IC301 @¡

– 9 – – 10 –

VOL T/DIV : 2m V AC TIME/DIV : 20 µsec

Page 8

NOTE :

• -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.

4-1. MDR-RF430

SECTION 4

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.

Ver 1.1 2000.12

4-2. MDR-RF450

MDD01

SW1

MDD02

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

1 4-994-129-01 PAD, EAR 2 X-4950-086-1 HOUSING (R) ASSY 3 4-994-119-01 HANGER (R) 4 4-992-281-01 HOLDER, BALL SHAFT 5 4-210-280-01 PLATE, RX SHIELD

* 6 A-4542-510-A RX BOARD, COMPLETE

7 4-994-121-01 COVER (R), HANGER 8 3-713-791-01 SCREW (M1.7X4), TAPPING, P2 9 4-995-597-01 SPACER 10 4-994-124-01 SUSPENDER

11 4-994-118-01 BAND, HEAD 12 4-994-123-01 COVER, BATTERY 13 X-4950-087-1 HOUSING (L) ASSY

14 4-995-475-01 SPRING, TENSION 15 4-994-130-01 TERMINAL (+), BATTERY

16 4-994-132-01 TERMINAL (MIDWAY), BATTERY 17 4-993-020-01 CASE, BATTERY 18 4-994-131-01 TERMINAL (-), BATTERY 19 4-994-122-01 COVER (L), HANGER 20 4-994-120-01 HANGER (L)

22 3-831-441-99 CUSHION, SPEAKER

* 24 A-4542-531-A FE BOARD, COMPLETE

MDD01 1-505-117-21 RECEIVER (L-CH) MDD02 1-505-117-21 RECEIVER (R-CH) SW1 1-771-249-11 SWITCH, PUSH (1 KEY) (POWER)

MDD02

MDD01

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

51 4-977-785-01 PAD, EAR 52 X-4950-101-1 PLATE (R) ASSY, FRONT 53 4-999-774-01 REGISTER, HOUSING 54 4-999-773-01 HOUSING (R)

* 55 A-4542-510-A RX BOARD, COMPLETE

56 4-999-769-01 COVER (R), HANGER 57 3-713-791-01 SCREW (M1.7X4), TAPPING, P2 58 4-210-255-01 SUPPORT, SWITCH

* 59 1-670-357-11 SW BOARD

60 4-999-767-01 HANGER (R)

61 3-318-203-62 SCREW (B1.7X4), TAPPING

* 62 4-999-791-01 PANEL, BACK * 63 4-999-792-01 CASE

64 4-978-519-01 CUSHION, HEAD 65 4-999-765-01 BAND, HEAD

66 4-999-771-01 SUSPENDER 67 4-978-518-02 BASE, SUSPENDER 68 4-999-768-01 COVER (L), HANGER 69 4-999-770-01 BATTERY COVER 70 4-210-258-01 TERMINAL (MIDWAY), BATTERY

71 4-210-256-01 TERMINAL (+), BATTERY 72 4-210-257-01 TERMINAL (-), BATTERY 73 4-999-766-01 HANGER (L) 74 4-999-772-01 HOUSING (L) 75 X-4950-100-1 PLATE (L) ASSY, FRONT

* 77 A-4542-531-A FE BOARD, COMPLETE

MDD01 1-505-117-21 RECEIVER (L-CH) MDD02 1-505-117-21 RECEIVER (R-CH)

– 11 – – 12 –

Page 9

SECTION 5

ELECTRICAL PARTS LIST

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.

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

• 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 Remark Ref. No. Part No. Description Remark

* A-4542-531-A FE BOARD, COMPLETE

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

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

* A-4542-510-A RX BOARD, COMPLETE

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

• SEMICONDUCTORS

In each case, u : µ , for example :

uA.... : µ A.... , uPA.... : µ PA....

uPB.... : µ PB.... , uPC.... : µPC....

uPD.... : µ PD....

• CAPACITORS

uF : µ F

• COILS

uH : µ H

C340 1-164-346-11 CERAMIC CHIP 1uF 16V C341 1-162-966-11 CERAMIC CHIP 0.0022uF 10% 50V C342 1-162-923-11 CERAMIC CHIP 47PF 5% 50V C350 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C355 1-162-919-91 CERAMIC CHIP 22PF 0.5PF 50V

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

< FILTER >

RXFE

< CAPACITOR >

C301 1-124-589-11 ELECT 47uF 20% 16V C302 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V C303 1-162-921-11 CERAMIC CHIP 33PF 5% 50V C306 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V C307 1-162-927-11 CERAMIC CHIP 100PF 5% 50V

C309 1-126-572-11 ELECT 4.7uF 20% 35V C310 1-110-563-11 CERAMIC CHIP 0.068uF 10% 16V C311 1-162-923-11 CERAMIC CHIP 47PF 5% 50V C312 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V C313 1-162-926-11 CERAMIC CHIP 82PF 5% 50V

C314 1-162-957-11 CERAMIC CHIP 220PF 5% 50V C315 1-124-233-11 ELECT 10uF 20% 16V C316 1-164-245-11 CERAMIC CHIP 0.015uF 10% 25V C317 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V C318 1-164-346-11 CERAMIC CHIP 1uF 16V

C319 1-164-505-11 CERAMIC CHIP 2.2uF 16V C320 1-164-346-11 CERAMIC CHIP 1uF 16V C321 1-164-346-11 CERAMIC CHIP 1uF 16V C322 1-124-242-00 ELECT 33uF 20% 25V C324 1-107-725-11 CERAMIC CHIP 0.1uF 10% 16V

C325 1-107-725-11 CERAMIC CHIP 0.1uF 10% 16V C326 1-124-635-00 ELECT 220uF 20% 6.3V C327 1-124-635-00 ELECT 220uF 20% 6.3V C328 1-124-635-00 ELECT 220uF 20% 6.3V C329 1-164-346-11 CERAMIC CHIP 1uF 16V

C330 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V C331 1-162-912-11 CERAMIC CHIP 7PF 0.5PF 50V C332 1-164-441-91 CERAMIC CHIP 68PF 5% 50V C333 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V C334 1-124-233-11 ELECT 10uF 20% 16V

C335 1-162-924-11 CERAMIC CHIP 56PF 5% 50V C336 1-162-924-11 CERAMIC CHIP 56PF 5% 50V C337 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V C338 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V C339 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V

CF301 1-577-588-11 FILTER, CERAMIC CF302 1-567-163-11 FILTER, CERAMIC

< DIODE >

D301 8-719-045-99 DIODE RD2.2M-T1B D302 8-719-002-81 DIODE 1T363 D303 8-719-023-84 LED HLMP-1801 (POWER)

< FERRITE BEAD >

FB301 1-414-234-11 INDUCTOR CHIP FB302 1-414-234-11 INDUCTOR CHIP FB303 1-414-234-11 INDUCTOR CHIP FB304 1-414-234-11 INDUCTOR CHIP FB305 1-414-234-11 INDUCTOR CHIP

FB306 1-414-234-11 INDUCTOR CHIP

< IC >

IC301 8-752-066-93 IC CXA1611N-T4 IC302 8-759-802-75 IC LA4533M IC303 8-759-195-02 IC TC7S86F-TE85L IC304 8-759-096-87 IC TC7WU04FU(TE12R)

< JUMPER RESISTOR >

JC301 1-216-295-00 METAL CHIP 0 5% 1/10W JC302 1-216-296-00 METAL CHIP 0 5% 1/8W JC303 1-216-296-00 METAL CHIP 0 5% 1/8W JC304 1-216-296-00 METAL CHIP 0 5% 1/8W JC305 1-216-296-00 METAL CHIP 0 5% 1/8W

JC308 1-216-864-11 METAL CHIP 0 5% 1/16W JC309 1-216-295-00 METAL CHIP 0 5% 1/10W JC310 1-216-864-11 METAL CHIP 0 5% 1/16W JC312 1-216-295-00 METAL CHIP 0 5% 1/10W JC313 1-216-864-11 METAL CHIP 0 5% 1/16W

JC314 1-216-864-11 METAL CHIP 0 5% 1/16W JC315 1-216-864-11 METAL CHIP 0 5% 1/16W JC316 1-216-295-00 METAL CHIP 0 5% 1/10W

– 13 –

Page 10

MDR-RF430/RF450

RX SW

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

< COIL >

< VARIABLE RESISTOR >

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

< TRANSISTOR >

Q301 8-729-230-49 TRANSISTOR 2SC2712-YG Q302 8-729-230-49 TRANSISTOR 2SC2712-YG Q303 8-729-230-49 TRANSISTOR 2SC2712-YG Q304 8-729-230-49 TRANSISTOR 2SC2712-YG Q305 8-729-230-49 TRANSISTOR 2SC2712-YG

Q306 8-729-920-31 TRANSISTOR DTC343TK Q307 8-729-230-49 TRANSISTOR 2SC2712-YG Q308 8-729-040-78 TRANSISTOR DTA124GKA-T146 Q309 8-729-027-36 TRANSISTOR DTA143XKA-T146

< RESISTOR >

R301 1-216-857-11 METAL CHIP 1M 5% 1/16W R302 1-216-847-91 METAL CHIP 150K 5% 1/10W R303 1-216-837-91 METAL CHIP 22K 5% 1/10W R304 1-216-827-11 METAL CHIP 3.3K 5% 1/16W R305 1-216-847-91 METAL CHIP 150K 5% 1/10W

R306 1-216-853-11 METAL CHIP 470K 5% 1/16W R307 1-216-845-11 METAL CHIP 100K 5% 1/16W R308 1-216-089-91 RES,CHIP 47K 5% 1/10W R309 1-216-841-11 METAL CHIP 47K 5% 1/16W R310 1-216-817-11 METAL CHIP 470 5% 1/16W

R311 1-216-821-11 METAL CHIP 1K 5% 1/16W R312 1-216-853-11 METAL CHIP 470K 5% 1/16W R313 1-216-827-11 METAL CHIP 3.3K 5% 1/16W R314 1-216-822-11 METAL CHIP 1.2K 5% 1/16W R315 1-216-830-11 METAL CHIP 5.6K 5% 1/16W

RV301 1-223-968-11 RES, VAR, CARBON 20K/20K (VOL) RV302 1-225-641-11 RES, VAR, CARBON 10K (TUNING) RV303 1-238-601-11 RES, ADJ, CARBON 22K (SEPARATION)

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

* 1-670-357-11 SW BOARD (RF450)

**********

< SWITCH >

SW1 1-572-467-61 SWITCH, PUSH (1 KEY) (POWER) (RF450)

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

MISCELLANEOUS

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

MDD01 1-505-117-21 RECEIVER (L-CH) (RF430) MDD01 1-505-117-21 RECEIVER (L-CH) (RF450) MDD02 1-505-117-21 RECEIVER (R-CH) (RF430) MDD02 1-505-117-21 RECEIVER (R-CH) (RF450) SW1 1-771-249-11 SWITCH, PUSH (1 KEY) (POWER) (RF430)

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

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

HARDWARE LIST

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

#1 7-685-103-19 SCREW +P 2X5 TYPE2 NON-SLIT (RF430) #2 7-685-104-19 SCREW +P 2X6 TYPE2 NON-SLIT (RF430) #3 7-685-106-19 SCREW +P 2X10 TYPE2 NON-SLIT (RF430) #4 7-685-105-19 SCREW +P 2X8 TYPE2 NON-SLIT (RF450)

R316 1-216-827-11 METAL CHIP 3.3K 5% 1/16W R317 1-216-827-11 METAL CHIP 3.3K 5% 1/16W R318 1-216-831-91 RES,CHIP 6.8K 1% 1/10W R319 1-216-061-00 METAL CHIP 3.3K 5% 1/10W R320 1-216-845-11 METAL CHIP 100K 5% 1/16W

R321 1-216-843-11 METAL CHIP 68K 5% 1/16W R322 1-216-843-11 METAL CHIP 68K 5% 1/16W R323 1-216-859-11 RES,CHIP 1.5M 5% 1/16W R324 1-216-033-00 METAL CHIP 220 5% 1/10W R325 1-216-825-91 METAL CHIP 2.2K 5% 1/16W

R326 1-216-827-11 METAL CHIP 3.3K 5% 1/16W R327 1-216-809-11 METAL CHIP 100 5% 1/16W R328 1-216-835-11 METAL CHIP 15K 5% 1/16W R329 1-216-001-00 METAL CHIP 10 5% 1/10W R330 1-216-001-00 METAL CHIP 10 5% 1/10W

R331 1-216-097-91 RES,CHIP 100K 5% 1/10W R334 1-216-845-11 METAL CHIP 100K 5% 1/16W R335 1-216-029-00 METAL CHIP 150 5% 1/10W R342 1-216-831-11 METAL CHIP 6.8K 5% 1/16W R345 1-216-841-11 METAL CHIP 47K 5% 1/16W

R348 1-216-831-11 METAL CHIP 6.8K 5% 1/16W R349 1-216-001-00 METAL CHIP 10 5% 1/10W R350 1-216-823-11 METAL CHIP 1.5K 5% 1/16W R360 1-216-837-91 METAL CHIP 22K 5% 1/10W

9-924-917-11

Sony Corporation

Personal A&V Products Company

– 14 –

98F027539-1

Published by Quality Engineering Dept.

(Shibaura)