MDR-IF5000

SERVICE MANUAL

Ver 1.0 1998. 11

E Model

MDR-IF5000 is the component model block one in
MDR-DS5000. COMPONENT MODEL NAME FOR MDR-DS5000
DIGITAL SURROUND PROCESSOR CORDLESS STEREO HEADPHONES DP-IF5000 MDR-IF5000

SPECIFICATIONS

Modulation System Frequency modulation Carrier wave frequency Right channel 2.8 MHz Left channel 2.3 MHz Frequency response 12 24,000 Hz Power requirements Rechargeable Ni-Cd batteries (supplied) or R6 (size AA) batteries (dry-cell or rechargeable, sold separately) Mass Approx. 280 g (including the supplied rechargeable Ni-Cd batteries) Design and specifications are subject to change without notice.
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.
CORDLESS STEREO HEADPHONES

MICROFILM

SECTION 1 GENERAL
This section is extracted from instruction manual.

SECTION 2 DISASSEMBLY

The equipment can be removed using the following procedure.
Set Frame assy Frame assy Hanger (L) Hanger (R) Band Assy, Head RX board Band Assy, Head
Note : Follow the disassembly procedure in the numerical order given.

2-1. FRAME ASSY

Remove the left and right ear pads in the same manner.
2 pad (inner), ear 1 pad (outer), ear 4 driver assy

5 P 2.6Xplate, front

3 claws

6 claws

plate, front

8 frame assy

hanger frame assy spread

9 hanger

spread

2-2. HANGER (L)

2 P 2.6X6

2-3. HANGER (R)

1 P 2.6X6

5 RX PD2 board (L-CH)

4 RX PD2 board (R-CH)

4 RX PD1 board (L-CH)

3 RX PD1 board (R-CH)

3 hanger (L)

2 hanger (R)

2-4. RX BOARD

2 RX board

2-5. BAND ASSY, HEAD

3 stopper, PC board 5 band assy, head 2 RX SW board

1 wire

When installing, take care to avoid extrusion of wire from the hanger.

4 claws

SECTION 3 ELECTRICAL ADJUSTMENTS
Notes: 1. These adjustments are performed in the order that they are discribed. 2. Adjustment and measurement are performed for each channel unless otherwise specified. 3. Adjustment is made for right channel first and then the left channel. 4. The power voltage at the headphones section is supplied with 1.2 V. 5. The processor section is used as jig to adjust the headphones section (MDR-IF5000). 6. Adjustment is made with the RX SW board and RX PD1 and RX PD2 boards (for both L-ch and R-ch) connected to the RX board with wires (normal part). Adjustment Location:
RX board (component side)

TP9 TP11

0 dB=0.775 V
Tuning Adjustment Preparation:
processor (DP-IF5000) headphones (MDR-IF5000)
TUNING ADJUSTMENT (R-ch) L54 L55 TUNING ADJUSTMENT (L-ch) L34 L35
1. Set the processor section (DP-IF5000) in test mode and operate the set to generate a signal of 1 kHz and 10 dB. (Refer to DP-IF5000 service manual page 7.) 2. Supply 1.2 V to between VCC and ground on the RX board. 3. Adjust RV11 (volume control) on the RX board to the minimum level. Setting:

distortion meter

RX board TP11 (L-ch) TP9 (R-ch)
1. Connect a distortion meter to TP11 (L-ch) and TP9 (R-ch) on the RX board. 2. Adjust L34 and 35 for L-ch and L54 and 55 for R-ch on the RX board so that the reading on the distortion meter is minimized.
MDR-IF5000 SECTION 4 DIAGRAMS

4-1. BLOCK DIAGRAM

AUDIO (L) MIXER LIMITER IC31 L34,35 TUNING (L) B+ (+3.0V) B+ (+1.7V) 2 INFRARED SENSOR D1-4 RF AMP Q1-3 BUFFER Q4 BPF QUAD COIL
SQUELCH TRIGGER WITH HYSTERESIS MUTE
GND OSC OSC MIXER IN OSCILLATOR MIXER OUT LIMITER IN LIMITER AMP AF AMP DEMODULATOR AF OUT

2.3MHz BPF L33

-1 L B+ (+3.0V)
DRIVER AMP (L-CH) IC3 VIN FC1 +

SP31 L-CH

RV10 BALANCE

B+ (+3.0V) RV11 VOL

BIAS CIRCUIT

MIXER IN

MIXER OUT

2.8MHz BPF L53

LIMITER IN LIMITER AMP

DEMODULATOR AF AMP

AF OUT
DRIVER AMP (R-CH) IC3 VIN FC1 + VOSP51 R-CH

OSC OSC

OSCILLATOR
L54,55 TUNING (R) B+ (+3.0V)

QUAD COIL

BIAS CIRCUIT DRY BATTERY SIZE "AA" (IEC DESIGNATION R6) 2PCS, 3V OR NICKEL CADMIUM BATTERY (NC-AA) 700mAh 2.4V
SQUELCH TRIGGER WITH HYSTERESIS AUDIO (R) MIXER LIMITER IC51
VCC 4 B+ (+1.8V) B+ (+1.7V) D10 POWER S10 (POWER)
Signal path : RF : ANALOG
4-2. PRINTED WIRING BOARDS

INFRARED SENSOR

TP9 -1 L TP11
B+ DRY BATTERY SIZE "AA" (IEC DESIGNATION R6) 2PCS, 3V OR NICKEL CADMIUM BATTERY (NC-AA) 700mAh 2.4V GND
Semiconductor Location Ref. No. D1 D2 D3 D4 D10 D51 D52 IC31 IC32 IC51 IC52 Q1 Q2 Q3 Q4 Location C-13 F-13 C-10 F-10 D-2 D-5 D-5 D-3 F-3 D-4 F-4 B-3 B-4 B-4 B-5

R-CH L-CH

Note: X
: parts extracted from the component side. : Through hole. : Pattern from the side which enables seeing. : Pattern of the rear side.
4-3. SCHEMATIC DIAGRAM Refer to page 13 for IC Block Diagrams.
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. : internal component. C : panel designation. U : B+ Line. H : adjustment for repair. Power voltage is dc 3 V and fed with regulated dc power supply from battery terminal.
Total current is measured with POWER ON (no-signal) mode. Voltage is dc with respect to ground under no-signal condition. no mark : POWER ON Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. Signal path. J : RF F : ANALOG

IC Block Diagrams

IC31, 51 SC111711DR2
MIXER INPUT 16 SCAN SQUELCH FILTER CONTROL IN OUTPUT 11 FILTER RECOVERD INPUT AUDIO 10 9

GND 15

MUTE 14
SQUELCH TRIGGER WITH HYSTERESIS

DEMODULATOR MIXER

LIMITER AMP

1 CRYSTAL OSC

3 MIXER OUTPUT

5 LIMITER INPUT

DECOUPLING

IC32, 52 MC34119DTBEL

GND VO2 VO1 Vcc

FILTER AMP

AF AMP

8 QUAD COIL

SECTION 5 EXPLODED VIEW
NOTE: The mechanical parts with no reference number in the exploded views are not supplied. Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. -XX and -X mean standardized parts, so they may have some difference from the original one. Color Indication of Appearance Parts Example : KNOB, BALANCE (WHITE). (RED) N Parts Color Cabinets Color N

not supplied

Ref. No. * 15
Part No. X-4951-063-1 X-4951-064-1 7-685-104-19 X-4951-014-1 4-213-919-01 X-4950-548-1 4-213-911-01 4-213-910-01 4-213-900-01 4-961-876-01 4-214-464-01 4-961-874-01 4-213-896-01 4-213-901-01 1-671-718-11
Description BAND (F) ASSY, HEAD BAND (R) ASSY, HEAD SCREW +P 2X6 TYPE2 NON-SLIT SUSPENDER ASSY PLATE (L), FRONT

Remark

Ref. No. * 18 * 19 * 26 * 27 * 28 SP31 SP51
Part No. 1-671-719-11 X-4951-066-1 4-213-918-01 1-671-720-11 A-4542-557-A X-4950-549-1 4-213-916-01 4-213-920-01 4-213-897-01 4-213-899-01 4-215-827-01 1-671-718-11 1-671-719-11 X-4951-065-1 X-4951-065-1
Description RX PD2 BOARD (L-CH) LID (L) ASSY, HANGER SPRING, TENSION RX SW BOARD RX BOARD, COMPLETE FRAME (R) ASSY SCREEN PLATE (R), FRONT HANGER (R) LID (R), HANGER STOPPER, BAND RX PD1 BOARD (R-CH) RX PD2 BOARD (R-CH) DRIVER ASSY (L-CH) DRIVER ASSY (R-CH)
FRAME (L) ASSY PAD (OUTER), EAR PAD (INNER), EAR LID, BATTERY TERMINAL (COMMONNESS), BATTERY TERMINAL, (-) BATTERY TERMINAL, (+) BATTERY HANGER (L) WINDOW, RAY CATCHER RX PD1 BOARD (L-CH)
SECTION 6 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 and -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. SEMICONDUCTORS In each case, u : , for example: uA. : A. uPA. : PA. uPB. : PB. uPC. : PC. uPD. : PD. CAPACITORS uF : F COILS uH : H When indicating parts by reference number, please include the board.

Ref. No. *

Part No.

Description

Ref. No. C65 C66 C67 C68
Part No. 1-135-201-11 1-163-033-11 1-135-201-11 1-135-180-21
Description TANTALUM CHIP CERAMIC CHIP TANTALUM CHIP TANTALUM CHIP < DIODE > 10uF 0.022uF 10uF 3.3uF 20% 20% 20%

Remark 4V 50V 4V 6.3V

A-4542-557-A RX BOARD, COMPLETE ******************* < CAPACITOR > C1 C2 C3 C4 C5 C6 C7 C8 C9 C30 C31 C32 C33 C34 C37 C38 C39 C40 C42 C43 C44 C45 C46 C47 C48 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 1-163-031-11 1-163-243-11 1-163-031-11 1-163-031-11 1-163-031-11 1-164-346-11 1-126-246-11 1-164-346-11 1-135-201-11 1-163-117-00 1-163-021-11 1-163-251-11 1-163-106-00 1-164-346-11 1-163-031-11 1-163-031-11 1-163-031-11 1-163-031-11 1-117-720-11 1-163-809-11 1-117-720-11 1-135-201-11 1-163-033-11 1-135-201-11 1-135-180-21 1-163-117-00 1-163-021-11 1-163-121-00 1-163-031-11 1-163-031-11 1-163-123-00 1-163-123-00 1-163-031-11 1-163-031-11 1-163-031-11 1-163-031-11 1-135-149-21 1-117-720-11 1-163-809-11 1-117-720-11 CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT CHIP CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP TANTALUM CHIP TANTALUM CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP 0.01uF 47PF 0.01uF 0.01uF 0.01uF 1uF 220uF 1uF 10uF 100PF 0.01uF 100PF 36PF 1uF 0.01uF 0.01uF 0.01uF 0.01uF 4.7uF 0.047uF 4.7uF 10uF 0.022uF 10uF 3.3uF 100PF 0.01uF 150PF 0.01uF 0.01uF 180PF 180PF 0.01uF 0.01uF 0.01uF 0.01uF 2.2uF 4.7uF 0.047uF 4.7uF 50V 50V 50V 50V 50V 16V 4V 16V 4V 50V 50V 50V 50V 16V 50V 50V 50V 50V 10V 25V 10V 4V 50V 4V 6.3V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 10V 10V 25V 10V

Sony Corporation

9-924-998-11
Personal A&V Products Company
98L047015-1 Printed in Singapore C1998. 12 Published by Quality Engineering Dept. (Shibaura)

Ver 1.1 1999. 02

US Model Canadian Model AEP Model UK Model E Model
NOTE: The mechanical parts with no reference number in the exploded views are not supplied. Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items.
FILTER RECOVERD INPUT AUDIO 10 9
MIXER INPUT 16 SCAN SQUELCH FILTER CONTROL IN OUTPUT 11
-XX and -X mean standardized parts, so they may have some difference from the original one. Color Indication of Appearance Parts Example : KNOB, BALANCE (WHITE). (RED) N Parts Color Cabinets Color N

9-924-998-12

99B0481-1 Printed in Japan C1999. 2 Published by Quality Engineering Dept. (Shinagawa)

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

Sony Electronics Inc. 1 Sony Drive Park Ridge, NJ 07656
2006 Sony Electronics Inc. All rights reserved. Reproduction in whole or in part without written permission is prohibited. Features and specifications are subject to change without notice. Sony and Unimatch are trademarks of Sony. Printed in USA (7/06) A-1149-A

www.sony.com/proaudio