MDR-IF8000

SERVICE MANUAL

Ver 1.1 2002.03

US Model Canadian Model AEP Model UK Model

SPECIFICATIONS

MDR-IF8000 is the component model block one in MDR-DS8000. COMPONENT MODEL NAME FOR MDR-DS8000 DIGITAL SURROUND PROCESSOR DP-IF8000 CORDLESS STEREO HEADPHONES MDR-IF8000
Playback frequency range Power requirements 12 24,000 Hz Rechargeable nickel metal hydride batteries (supplied or sold separately) or R6 (size AA) alkaline batteries Approx.350 g (10 oz)(including the supplied rechargable nickel-metal hydride batteries)
CORDLESS STEREO HEADPHONES

9-873-527-02

2002C0200-1 2002.03

Sony Corporation

Personal Audio Company Published by Sony Engineering Corporation
Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. Flexible Circuit Board Repairing Keep the temperature of soldering iron around 270C 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 or unsoldering. Repair MDR-IF8000 and DP-IF8000 in a pair.

TABLE OF CONTENTS

1. GENERAL... 2 2. DISASSEMBLY
2-1. 2-2. 2-3. 2-4. Hanger (R)... 3 VOL Board, RX1 Board, RX2 Board.. 3 PD1 Board... 4 Driver ASSY (SP31) (R-ch Section), DriverASSY (SP11) (L-ch Section).. 4 2-5. Hanger (L), Headband (R) ASSY, Headband (F) ASSY, SW Board... 5
3. ELECTRICAL ADJUSTMENTS.. 6 4. DIAGRAMS
4-1. 4-2. 4-3. 4-4. 4-5. 4-6. Block Diagrams.. 7 Printed Wiring Board RX1 Section . 8 Schematic Diagram RX1 Section .. 9 Printed Wiring Board RX2 Section .. 10 Schematic Diagram RX2 Section (1/2) .. 11 Schematic Diagram RX2 Section (2/2) .. 12

5. EXPLODED VIEWS

5-1. Driver Section... 14 5-2. Hanger Section... 15
6. ELECTRICAL PARTS LIST..16

SECTION 1 GENERAL

LOCATING THE CONTROLS
This section is extracted from instruction manual.

1 Infrared sensor

There are infrared sensors in two locations on both sides.
5 RESET button (See page 21 for details)
Use to reset the location information of the head tracking function.

2 Battery case

Press and lift up the lid to open it. This battery case is for the supplied rechargeable batteries and R6 (size AA) alkaline batteries only.
6 HEAD TRACKING switch (See page 21 for details)
To activate the head tracking function, switch it to ON when the output mode of the processor is set to VIRTUAL (other than OFF).

3 Self-adjusting band

The headphones automatically turn on when you put on the headphones.

7 VOL (Volume) control

Use to adjust the volume.

4 POWER indicator

By pulling up the self-adjusting band, the indicator lights red when battery power is sufficient.
8 Ear pad (right) 9 Ear pad (left)

SECTION 2 DISASSEMBLY

The equipment can be removed using the following procedure. Driver ASSY (SP31) (R-CH SECTION)
Hanger (R) Set Hanger (L)
VOL board, RX1 board, RX2 board PD2 board

PD1 board

Head band (R) ASSY, Head band (F) ASSY, SW board Driver ASSY (SP11) (L-CH SECTION)
Note : Follow the disassembly procedure in the numerical order given.

2-1. HANGER (R)

1 Screw (+P 2X8)
7 Remove solder (four places)

2 Two screws (+P 2X5)

6 Screw (+P 2X5)

5 Hanger (R)

Lid (R), rear

Chassis

3 Hanger lid (R) ASSY

4 Screw (+P 2X8)

2-2. VOL BOARD, RX1 BOARD, RX2 BOARD
3 Remove solder (six places)

chassis

7 RX2 board RX1 board 1 CNVOL board

2-3. PD1 BOARD

Can remove PD2 board with similar method.

1 Screw (M1.7X5)

4 PD1 board

2 Window, ray catcher

3 Remove solder (two places)
2-4. DRIVER ASSY (SP31) (R-CH SECTION), DRIVER ASSY (SP11) (L-CH SECTION)
Can remove driver ASSY (SP11) L-CH with similar method.
1 Pad, ear 2 Tow screws (M1.7X5) 3 Claw 4 Ring (ear pad R)

Driver ASSY (SP31)

5 Screw (+P2X5)

Attach the cushion

Cushion

3 Claw

1 Applied the bond in outside lap with 2mm 2 width

Frame (R) ASSY

8 Remove solder (two places)
Plate, support Driver ASSY

7 Three screws (+P2X5)

6 Claw
Bond: Sony bond SC608LV (7-432-912-52)
2-5. HANGER (L), HEADBAND (R) ASSY, HEAD BAND (F) ASSY, SW BOARD
R-CH section L-CH section
Headband (F) ASSY Headband (R) ASSY

Headband (R) ASSY

Screw (+P2X8)
Lid (R), rear 7 Screw (+P2X4)

5 Two screws (+P2X5)

qa Screw (+P2X5)

qs SW board

1 Screw (+P2X4) 0 Remove solder (two places)

Hanger (L)

MDR-IF8000 SECTION 3 ELECTRICAL ADJUSTMENT

0dB=0.775V

CAUTION: 1. Apply a 2.4 volt DC supply voltage. 2. Use the processor section (DP-IF8000) as a test jig to align the headphones (MDR-IF8000).

[BPF ADJUSTMENT]

Setup: 1. Set the processor section (DP-IF8000) to test mode, and generate a -10dB signal. (Refer to the DP-IF8000 service manual.) 2. Adjust RV11 (VOLUME) on the VOL board to a minimum. Connection and adjustment points:

RX2 BOARD (SIDE B)

L152 L153 C114 C101 L1

Spectrum analyzer

C102 C134 C132

R128 C131 C130 C129

C105 C145 RV121 R137

R104 C108

R136 R107 R105 C107
Procedure 1. Connect a spectrum analyzer to the RX2 board as shown in the above drawing. 2. Adjust the spectrum analyzer output waveform by rotating RV121 so that the center of the waveform is 4.5 MHz with a uniform balance on both sidebands.
<Reference view of spectrum analyzer waveform after adjustment>

about 25dB

about 1.25MHz

4.5MHz

SECTION 4 DIAGRAMS

4-1. BLOCK DIAGRAMS

FRONTEND D125-136 (L-CH) RXPHOTO DETECT D137-148 (R-CH) 6 IN OUT ADVIN
DIAT TXOUT/ RINFO 55 DAOAUT/ROUT 60
DSP DAI SDOFST FCKR SCKT GPIO2 HCKR MOSI SCK XHREQ PINT XRESET D0 SS GPIOGYRO XRST SDO SCK XHREQ DSPDTQ DSP XRST DSP GYRO DSP XCS ARDET 15 DIN

D/A CONVERTOR VOUTL 12

RV11 VOLUME 4
POWER AMP VIN VO1 VO8 SP11 SPEAKER (L-CH)

19 SDISDI0

16 RV121 BPF ADJ ICLK A Y MCK EXTAL
16 LRCIN 14 BCKIN VOUTR 9 POWER AMP MUTE Q101,102 VIN

VO1 VO2

LEVEL SHIFT X101 12.288MHz 40 OSCI 43 OSCO

MODA HCKT SDO2

SP31 SPEAKER (R-CH)

94 GPIO1

GY101 GYRO SENSOR OUT 4 5

DTVALIO

3 BCK/RCLK 54 APX 31

XRST DTSE

LRCK/RCS 59 Q501

RSTB MUTE

2 SCKI

AMP 1 6

GYRO XRST 1
D201 POWER LED DRIVER Q201

SW501 RESET

DAC_XRST DMUTING SDO SCK XHREQ DSP DTQ DSP XRST DSP GYRO DSP XCS ARDET

DIAT_XRST DIAT_DTSEL

BUFFER

DSP_XGC

AMUTING P04

P02 P30

P21 P20 P12 P06 P00 P05 P07 P14

P01 P23

+3.3V 3 RESET XRESET 1

X901 5MHz 5 X2

P26 P11

SW502 HEAD TRACKING OFF

SYSTEM CONTROL

6 ADVIN

IC205 Signal Path : LINE(ANALOG) : LINE(DIGITAL)
1 LEVEL DETECT 2 BATT 2.4V +2.5V +3.3V +1.5V

IC201,

1 Q202,D203 SWITCHING REGULATOR
BATT 2.4V B+ SWITCH Q951 SW401 (POWER) RECHARGEABLE BATTERY NH-AA 1.2V 1600mAh,2pcs 2.4V or DRY BATTERY SIZE"AA" (IEC DESIGNATION LR6) 2PCS,3V

+2.5V REG. 2

5 +1.5V REG. 2 3
4-2. PRINTED WIRING BOARDS RX1 SECTION

RX1 BOARD (SIDE A)

VOL BOARD

C522 C523 L503

RED D201 POWER SP31 SPEAKER (R-CH)
L2 C36 R516 R517 R518 C525 R904 C917 C31 C35

R201 L36

RV11 VOLUME

R536 R521

R31 R34 C32 R32 C38

R515 R522 R519 C521 C520

Q102 C524 C17 R13 R35

CLEAR C34 RL35 L1 L16

C157 C156 R151 R520 SL901
RED R+ CLEAR LL+ GREEN SP11 SPEAKER (L-CH)

R11 C37 R33 R14 C15 R12

1-683-30221 (21)
RC159 CQ101 C11 C18 R15 C16

2 CNC33 C13

1-683-299-

21 (21)

RX1 BOARD (SIDE B)
SW502 HEAD TRACKING ON OFF CNC905 R906

C902 C908 D203

R909 C911 C217 C907 C906 C910 R905 C904 C903 R903 R901 R902 R910 R206

21 1-683-302- (21)

Semiconductor Ref. No.

D201 D203

Location

E-8 D-7

SW BOARD (SIDE A)

R402 R401

SW BOARD (SIDE B)
RECHAGEABLE BATTERY NH-AA 1.2V 1600mAh,2PCS 2.4V or DRY BATTERY SIZE "AA" (IEC DESIGNATION LR6) 2PCS, 3V 21 1-683-303(21) BLK RED

X901 C210

C216 C208

RX2 BOARD CN002

C209 R207 C909

SW401 (POWER)

IC11 IC52 IC201 IC202 IC203 IC205 IC502 IC503 IC504 IC901 IC902

B-7 B-7 E-7 E-7 F-8 E-8 B-5 A-5 B-6 D-6 E-6

1-683-303- 21 (21)

Q101 Q102 Q201 Q202 Q901 Q951

B-6 B-7 E-8 D-7 E-5 E-2

4-3. SCHEMATIC DIAGRAM RX1 SECTION
Refer to page 13 for Notes.
Refer to page 13 for IC Block Diagrams.
Refer to page 13 for Waveforms.
CN001 AXK5S30045P 30PIN D_2.5V 3.3V 3.3V D_GND D_GND N.C N.C DMUTING ARDET DSP_XGC DAC_XRST DIAT_DTSEL DIAT_XRST DSP_XRST DSP_DTQ XHREQ DTQ SCK SDO DSP_XCS GYRO_IF1 DSP_GYRO GYRO_XRST GYRO_IF2 L_OUT R_OUT A_GND RF_2.5V RF_GND 1.5V RV11 50k X2 VOLUME
R536 10k L503 4.7 R519 10k R518 100k R517 270k R516 R515 100k 100k
DMUTING ARDET DSP XGC DAC XRST DIAT DTSEL DIAT XRST DSP XRST DSP DTQ XHREQ

GY101 GYRO GYRO SENSOR

IC504 NJU7015R AMP

IC503 NJU7015R AMP

R520 100k
C523 0.1 C10V C524 0.1 R522 100k C522 2200p R521 10k C521 0.1 C10V

IC502 TC7WU04FU BUFFER

Q901 DTC144EE-TL SWITCH

SCK SDO DSP XCS DSP GYRO

L901 R905 4.7k IC902 XC61FN2812MR RESET C901 0.1 C910 0.1 C10V R910 10k R152 1k C906 1000p C10V C10V C159 2200p C158 2200p R151 1k C904 1000p

R901 10k C903 1000p

IC901 PD789074MC-012 -5A4-E1 SYSTEM CONTROL P10 P31 IC XRESET X2 X1 VSS VDD P30 P27 P26 P25 P24 P23 P22 P11 P12 P13 P14 P15 P00 P01 P02 P03 P04 P05 P06 P07 P20 P21

R902 10k R903 10k

C909 0.1 SL901

C905 1000p

C907 1000p

XHREQ ARDET

R909 1M

C911 1000p

DSP XRST DAC XRST DIAT XRST
CN503 L CH VOL OUT L CH VOL INPUT VOL GND R CH VOL INPUT R CH VOL OUT CENTER RESET GND CENTER_RESET GYRO_ON/OFF GND GYRO_ON/OFF SW
CN502 L CH VOL OUT L CH VOL INPUT VOL GND R CH VOL INPUT R CH VOL OUT CENTER RESET GND CENTER_RESET GYRO_ON/OFF GND GYRO_ON/OFF SW ON OFF
SW501 RESET SW502 HEAD TRACKING

X901 5MHz

R907 0
R904 10k C10V R906 1k Q101 UN2225-(TX) MUTE Q102 UN2225-(TX) MUTE L35 L2 4.7 L36 +

TP911 SDI

DSP GYRO DSP DTQ DSP XCS SCK SDO

SP31 RCH

C908 1000p
DMUTING DSP XGC DIAT DTSEL
C32 68p C10V C37 1000p R33 470k

R32 68k R31 10k R34 470k

IC52 MC34119DTBR2 POWER AMP

R35 4.7k

C38 0.01

C34 0.1

C36 3.3 4V
IC203 XC62HR1502MR +1.5V REGULATOR L201 R206 10k VOUT NC VIN VSS CE IC202 TK11225BMCL +2.5V REGULATOR R201 1k IC201 XC6367A331MR SWITCHING REGULATOR Q202 XP151A13A0MR SWITCHING REGULATOR

L1 4.7 D203 MA2Z748 L202

L15 L16

SP11 LCH

VSS VOUT

C204 4.7 C10V C205 4.7

D201 TLSU124 POWER
IC205 XC61CN18O2NR LEVEL DETECT

C12 68p C10V

R12 68k R11 10k R14 470k
IC11 MC34119DTBR2 POWER AMP

R207 10k

IN CNT GND

OUT CNP

EXT GND VOUT VDD CE

C17 1000p

R13 470k R15 4.7k C18 0.01

C10V C14 0.1

C212 0.1 C4V

C211 0.1

C209 0.1

C216 0.1

C217 0.1 C202 0.1 C10V
Q201 DTC144EE-TL LED DRIVER

C16 3.3 4V

Q951 CPH3107 B+ SWITCH

R402 470

R401 4.7k SW401 (POWER)
RECHARGEABLE BATTERY NH-AA 1.2V 1600mAh,2PCS 2.4V OR DRY BATTERY SIZE"AA" (IEC DESIGNATION LR6) 2PCS,3V
4-4. PRINTED WIRING BOARDS RX2 SECTION

PD1 BOARD (SIDE A)

D130 D131

PD1 BOARD (SIDE B)

C133 L152 L153 C101 C102 C134 C139 R159 L155 L159 C114 C115 L104

R131 C135

C136 C103

C132 C138

C123 L121 R134
C131 C130 C129 C105 C145 RV121

1-683-304- 21 (21)

1-683-304- 21 (21) TP123 (BPF ADJ MONITOR)

R136 R107

C141 R106 C106 L102

D126 D125

C111 C113

1-683-300-

Semiconductor Ref. No. Location
B-1 B-1 B-1 A-1 A-1 A-1 A-1 A-1 A-1 B-1 B-1 B-1 E-1 E-1 D-1 D-1 D-1 D-1 D-1 D-1 D-1 D-1 E-1 E-1 D-4 D-4

C507 D151 C506

D150 C505 C504

L551 C537

E 1-683-305- 21 (21) 1-683-305- 21 (21)

R529 R528 C534 C535 C533

C519 C518

C509 L501

PD2 BOARD (SIDE A)

PD2 BOARD (SIDE B)

RX2 BOARD (SIDE A)
C510 R507 R530 C545 C528 C511 C539 R552 R505 L552 R160 C540 C526 C527

C512 R504

L160 R161 R158 L158 R157 L103 C160 C117

L502 L161 CN30

C536 R503 R502

RX1 BOARD CN001

C515 R551

C126 R550

C517 C516 R534

R135 C153

D125 D126 D127 D128 D129 D130 D131 D132 D133 D134 D135 D136 D137 D138 D139 D140 D141 D142 D143 D144 D145 D146 D147 D148 D150 D151
C155 Q501 R510 C541IC505 C154 R129
IC101 IC102 IC121 IC501 IC505 IC601

B-6 E-6 B-5 D-5 E-5 D-6

4-5. SCHEMATIC DIAGRAM RX2 SECTION (1/2)
DTQ DIAT XRST DIAT DTSEL D 2.5V CN002 30PIN(PLUG)
D_2.5V 3.3V 3.3V D_GND D_GND N.C N.C DMUTING ARDET DSP_XGC DAC_XRST DIAT_DTSEL DIAT_XRST DSP_XRST DSP_DTQ XHREQ DTQ SCK SDO DSP_XCS GYRO_IF1 DSP_GYRO GYRO_XRST GYRO_IF2 L_OUT R_OUT A_GND RF_2.5V RF_GND 1.5V

R534 10k

C516 0.1 C517 0.1 TP501

C518 0.1

C519 0.1
C533 1000p R527 10k C534 1000p R528 10k C535 1000p R529 10k
R510 1k Q501 DTC144EE-TL SWITCH
IC505 74LVC1G04GW.118 SWITCH VCC A GND Y R509 10k C541 0.1

R550 1k

C515 0.1 C514 0.1 R551 1k L551 C513 0.1 C537 1000p R502 10k C536 1000p R503 10k
MODD MODB MODA FST FSR SCKT FCKR VCCS GNDS HCKT VCCLQ GNDQ HCKR DAI SDO0 VCCHQ SDO1 SDO2 SDO3 SDI1 SDI0 VCCS GNDS SS MOSI MISO

D132 PP508

D131 PP508

D130 PP508

D129 PP508

D128 PP508

D127 PP508

D126 PP508

D125 PP508

R104 3.3k C109 0.1

C110 0.1 C6.3V

D148 PP508

D147 PP508

D146 PP508

D145 PP508

D144 PP508

D143 PP508

D142 PP508

D141 PP508

D140 PP508

D139 PP508

D138 PP508

D137 PP508

C106 0.01

RC107 0.1 C108 0.1

L102 22
Note: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. f : internal component. : B+ Line. H : adjustment for repair. Power voltage is dc 3V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are dc with respect to ground under nosignal conditions. no mark : LINE Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. Circled numbers refer to waveforms. Signal path. J : LINE (ANALOG) c : LINE (DIGITAL)
IC Block Diagrams IC11, 52 MC34119DTBR2

GND VO2 VO1

BIAS CIRCUIT

IC502 TC7WU04FU (TE12R)

Note: X : parts extracted from the component side. a : Through hole. : Pattern from the side which enables seeing. (The other layers'patterns are not indicated) Caution: Pattern face side: (Side B) Parts face side: (Side A)

z Waveforms

1A 3Y 2A GND

VCC 1Y 3A 2Y

Parts on the pattern face side seen from the pattern face are indicated. Parts on the parts face side seen from the parts face are indicated.

RX1 SECTION

3.8Vp-p

10 sec

Q202 D
VOLT/DIV : 1 V AC TIME/DIV : 5 sec

RX2 SECTION

2.5 Vp-p

12.288MHz

VOLT/DIV : 1 V AC TIME/DIV : 50 nsec

IC101 rd OSCO

MDR-IF8000 SECTION 5 EXPLODED VIEWS

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. The mechanical parts with no reference number in the exploded views are not supplied. Hardware (# mark) list and accessories are given in the last of this parts list.

5-1.DRIVER SECTION

#1 #1 #1

Ref. No. 5

Part No. 3-234-815-01 3-234-807-01 3-234-816-01 3-234-817-01 3-234-805-01
Description PAD, EAR RING (EAR PAD:L) SCREEN CUSHION PLATE, SUPPORT

Remark

Ref. No. SP11 SP31 #1
Part No. 3-713-791-11 3-239-171-01 X-3381-891-1 X-3381-891-1 7-685-103-19
Description SCREW (M1.7X5), TAPPING, P2 RING (EAR PAD :R) DRIVER ASSY (L-CH) DRIVER ASSY (R-CH) SCREW +P 2X5 TYPE2 NON-SLIT

5-2. HANGER SECTION

Ref. No. 63 * 68 69
Part No. X-3381-234-1 3-713-791-11 3-234-800-01 1-683-305-11 3-234-799-01 3-236-005-01 X-3381-889-1 3-236-012-01 3-234-814-01 3-234-813-01 3-234-791-01 3-234-812-01 1-683-303-11 3-234-798-01 4-213-918-01 3-234-793-01 X-3381-236-1 X-3381-887-1 X-3381-888-1
Description FRAME (L) ASSY SCREW (M1.7X5), TAPPING, P2 LID (RAY CATCHER) PD2 BOARD WINDOW, RAY CATCHER HOLDER, LED (MDR) BATTERY LID ASSY LID (L), HANGER TERMINAL (-), BATTERY TERMINAL (RELAY), BATTERY HANGER (L) TERMINAL (+), BATTERY SW BOARD REINFORCEMENT SPRING LID (L), REAR SUSPENDER ASSY HEADBAND (F) ASSY HEADBAND (R) ASSY

Ref. No. * 74 75

Part No.

Description

3-234-794-01 LID (R), REAR 3-234-808-01 3-234-809-01 3-234-810-01 A-3062-871-A 3-234-797-01 A-3062-867-A 1-926-061-60 1-683-302-11 X-3381-890-1 1-683-304-11 X-3381-235-1 3-234-792-01 3-234-811-01 7-685-103-19 7-685-102-19 LIGHT, GUIDE BUTTON (RESET) KNOB (VOL) RX2 BOARD, COMPLETE CHASSIS RX1 BOARD, COMPLETE FLAT CABLE VOL BOARD HUNGER LID (R) ASSY PD1 BOARD FRAME (R) ASSY HANGER (R) KNOB (GYRO) SCREW +P 2X5 TYPE2 NON-SLIT SCREW +P 2X4 TYPE2 NON-SLIT

83 #1 #2 #3 #4

7-685-105-19 SCREW +P 2X8 TYPE2 NON-SLIT 7-627-551-78 SCREW,PRECISION +P 1.4X4
MDR-IF8000 PD1 PD2 RX1 SECTION 5 ELECTRICAL PARTS LIST
Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. SEMICONDUCTORS In each case, u : , for example : uA. : A. , uPA. : PA. uPB. : PB. , uPC. : PC. uPD. : PD. CAPACITORS uF : F COILS uH : H
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

ACCESSORIES

***********
1-756-272-11 BATTERY, NICKEL HYDROGEN 3-238-078-11 MANUAL, INSTRUCTION (ENGLISH, FRENCH,SPANISH) 3-238-078-21 MANUAL, INSTRUCTION (GERMAN,DUTCH, ITARIAN,PORTUGUESE)(AEP) 3-238-080-01 LABEL, ITF BAR CODE
< VARIABLE RESISTOR > RV121 1-238-854-11 RES, ADJ, CERMET 2.2K (BPF) < VIBRATOR > X101 1-795-485-21 VIBRATOR, CRYSTAL (SMD) (12.288MHz)

1-683-303-11 SW BOARD

********
< TRANSISTOR > Q951 8-729-053-67 TRANSISTOR CPH3107-TL < RESISTOR > R401 R402 1-216-829-11 METAL CHIP 1-216-817-11 METAL CHIP < SWITCH > SW401 1-572-467-61 SWITCH, PUSH (1 KEY) (POWER) 4.7K 470 5% 5% 1/16W 1/16W

1-683-302-11 VOL BOARD

3-234-810-01 KNOB (VOL) 7-627-551-78 SCREW,PRECISION +P 1.4X4 < CONNECTOR > CN502 1-784-368-31 CONNECTOR, FFC/FPC 9P < VARIABLE RESISTOR > RV11 1-227-448-11 RES, VAR, CARBON 50K/50K (VOL) (VOLUME)

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. 1.0 1.1 Date 2002. 02 2002. 03 New Addition of UK model.

(ENG-02010)

Description of Revision

Sony MDR-7500 Series Professional Headphones

Professional Headphones

Sonys range of professional headphones are engineered for a combination of strength, comfort and practicality and are used daily in broadcast and recording studios worldwide. Designed to accurately monitor the wide dynamic range and extended frequencies delivered by modern digital audio equipment, the MDR-7500 series is precision manufactured using the highest grade materials. All Sony professional headphones come complete with a gold-plated Unimatch 3.5mm/6.3mm adaptor, and service manual detailing spare parts available through Sonys dedicated professional service centers.
MDR-7509HD Designed for critical listening applications, the MDR-7509HD
headphone features newly developed HD Driver units that deliver ultra-wide dynamic range and incredible power handling capabilities. With 3,000 mW power handling capacity and 80kHz ultra high frequency reproduction, the MDR-7509HD model precisely reproduces every nuance recorded using the latest generation of high-quality audio formats such as DSD or high sampling linear PCM. The 50mm HD Driver units utilize 360kJ/m3 high power neodymium magnets to reproduce clear midrange. Equally important to sound quality is wearing comfort. The MDR-7509HD headphone features an Auranomic circum aural design where the driver units have been designed in accordance with the angle of the ear, thereby helping to eliminate pressure on the ear and to reproduce a natural, wide soundscape.

Protector

Reinforcement Ring / OFC Voice Coil
360kJ/m3 Neodymium Magnet Frame
The Structure of the HD Driver Unit The newly-developed
driver unit features a Reinforcement Ring between the voice coil and the diaphragm. It assists spreading ultra high frequency vibration generated by voice coil to the HD diaphragm with a coherent phase.

HD-Diaphragm

Pole Piece
MDR-7506 An extremely high quality, unobtrusive reference headphone. The lightweight
MDR-7506 model has been engineered to be comfortable to wear for extended periods, making it ideal for use in broadcast and studio environments. A 40mm PET diaphragm and neodymium magnet provide performance exceeding the requirements of digital sources such as CD, MD and DAT.
MDR-7505 Thanks to an acoustic design that positions the sound field very close to the ears,
the MDR-7505 headphone makes detailed listening possible, even in noisy environments. An AutoSwivel earpiece enables single sided monitoring. The 40mm PET driver & neodymium magnet provide excellent sound quality and extended frequency response. An adjustable, padded headband offers durability and comfort. Oxygen Free copper cable is used to preserve signal quality.
MDR-7502 A cost effective, general purpose headphone. The lightweight, closed design of
the MDR-7502 model allows long term use without listening fatigue. The neodymium magnet (used in all Sony professional headphones) is virtually five times more powerful than standard ferrite magnets, delivering dynamic sound, high sensitivity and deep bass response.

SPECIFICATIONS

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