Sony MDR-27 User Manual

MDR-Z7

SERVICE MANUAL

Ver. 1.0 2014.09

SPECIFICATIONS

Type Closed, dynamic (circum-aural)
Driver unit 70 mm, dome type (CCAW Voice Coil)
Power handling capacity 2,000 mW (IEC*)
Impedance 70 Ω at 1 kHz
Sensitivity 102 dB/mW
Frequency response 4 Hz - 100,000 Hz
Mass Approx. 335 g without cable
Supplied accessories

Headphone cable (Approx. 3 m, silver-coated OFC strands, gold-plated stereo mini
plug) (1)
Balanced-connection headphone cable (Approx. 2 m, silver-coated OFC strands,
3-pole mini plug × 2) (1)
Gold-plated unimatch plug adaptor (stereo phone plug stereo mini jack) (1)
Operating Instructions (1)

* IEC = International Electrotechnical Commission

Design and specications are subject to change without notice.

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

9-896-052-01

2014I33-1

2014.09

©

STEREO HEADPHONES

Sony Corporation

Published by Sony Techno Create Corporation

MDR-Z7

SECTION 1

SERVICING NOTES

The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.

DESTINATION ABBREVIATIONS

The following abbreviations for model destinations are used in this
service manual.

• Abbreviations
AUS : Australian model
CH : Chinese model
CND : Canadian model

NOTE OF REPLACING THE HEAD BAND ASSY

A serial number is marked on the unit’s head band arm.
Therefore, when the head band assy is replaced, the serial number
changes.

serial number

– L-ch –

– R-ch –

2

DISASSEMBLY

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

2-1. DISASSEMBLY FLOW

MDR-Z7

SECTION 2

SET

2-2. EAR PAD, EAR PAD HOLDER
(Page 4)

2-3. HOUSING BLOCK
(Page 5)

2-4. FRONT PLATE ASSY
(Page 5)

2-5. HOUSING ASSY, HANGER
(Page 6)

Note: Please detach the CABLE WITH PLUG beforehand.

3

MDR-Z7

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

2-2. EAR PAD, EAR PAD HOLDER

Note 1: L-ch and R-ch can be similarly disassembled.

The illustration of R-ch is used for explanation.

When installing the ear pad block to the housing block,

Note 2:

align the ear pad block boss with the housing block ditch.

1 Turn over the ear pad.

5 ear pad

3 Remove the ear pad block

in the direction of the arrow.

hole

2 screw (P2)

ditch

ditch

housing block

boss

ear pad block

Turn in the direction of
the arrow until it stops.

Note 3:

4

When installing the ear pad, check the inside color.

– L-ch –– R-ch –

Inside color is [black].

Inside color is [red].

6 ear pad holder

4 Remove the protrusion

from the ear pad hole.

2-3. HOUSING BLOCK

Note:L-ch and R-ch can be similarly disassembled.

The illustration of R-ch is used for explanation.

1 ornamental screw
(M1.7)

MDR-Z7

1 ornamental screw
(M1.7)

3 twist holder

5 housing block

2-4. FRONT PLATE ASSY

Note: L-ch and R-ch can be similarly disassembled.

The illustration of R-ch is used for explanation.

boss

2 Remove the front plate assy
in the direction of the arrow.

4 axis cushion

2 shaft stopper

:LUHVHWWLQJ

[red]
(marking side)

[bronze]
(no marking side)

Direction in which
to apply the solder.

boss

3 Remove the solder
[red]

3 Remove the solder
[blonze]

4 front plate assy

ditch

ditch

1 three screws
(P2)

1 three screws
(P2)

cable with jack

marking

front plate assy

5

MDR-Z7

2-5. HOUSING ASSY, HANGER

Note 1: L-ch and R-ch can be similarly disassembled.

The illustration of R-ch is used for explanation.

6 hanger

$[LVFXVKLRQDQG+DQJHUKROGHUVHWWLQJ

Align the directions
of the slopes.

hanger

groove

axis cushion

5 axis cushion

3 housing holder

4 housing assy

2 two screws

(P2)

5 axis cushion

2 two screws

(P2)

3 housing holder

1 rear seal

Note 2:
affix the glossy surface to
the housing assy.

When installing the rear seal,

hanger holder

–KDQJHUERWWRPYLHZ–

6

Note:

• -XX and -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.

3-1. HOUSING (R-ch) SECTION

• Front view

9

7

10

8

6

6

7

4

4

4

SECTION 3

EXPLODED VIEWS

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

• Color Indication of Appearance Parts Ex­ample:

KNOB, BALANCE (WHITE) . . . (RED)
 

– R-ch –

7

4

Parts Color Cabinet’s Color

11

11

MDR-Z7

housing (L-ch), head band section

– L-ch –

4

HJ2

4

4

5

DR2

4

4

4

2

3

1

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

1 4-541-036-01 PAD (R), EAR (R-ch)
2 4-541-034-01 HOLDER, EAR PAD
3 3-080-204-31 SCREW, TAPPING, P2
4 3-080-205-21 SCREW, TAPPING, P2
5 4-541-023-01 SEAL, REAR

6 4-541-025-01 HOLDER, HANGER
7 4-541-076-01 CUSHION, AXIS
8 4-541-013-01 HANGER (R) (R-ch)

9 4-540-997-01 HOLDER, TWIST
10 4-540-998-01 STOPPER, SHAFT

11 4-541-006-01 ORNAMENTAL SCREW M1.7 (TAPPING)
DR2 X-2590-515-1 PLATE (R) ASSY, FRONT (SV) (Including Driver)

(R-ch)

HJ2 X-2590-513-1 HOUSING (R) ASSY (SV)

(Including Cable with jack) (R-ch)

7

MDR-Z7

3-2. HOUSING (L-ch), HEAD BAND SECTION

• Rear view

– L-ch –

61

HB1

A serial number is marked on the unit’s head

Note:

band arm. Therefore, when the head band assy
is replaced, the serial number changes.

HJ1

58

59

57

57

56

55

54

54

60

56

61

DR1

– R-ch –

57

54

54

54

54

54

54

54

54

52

53

51

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

51 4-541-035-01 PAD (L), EAR (L-ch)
52 4-541-034-01 HOLDER, EAR PAD
53 3-080-204-31 SCREW, TAPPING, P2
54 3-080-205-21 SCREW, TAPPING, P2
55 4-541-023-01 SEAL, REAR

56 4-541-025-01 HOLDER, HANGER
57 4-541-076-01 CUSHION, AXIS
58 4-541-012-01 HANGER (L) (L-ch)
59 4-540-997-01 HOLDER, TWIST

60 4-540-998-01 STOPPER, SHAFT

61 4-541-006-01 ORNAMENTAL SCREW M1.7 (TAPPING)
DR1 X-2590-514-1 PLATE (L) ASSY, FRONT (SV) (Including Driver)

(L-ch)

HB1 X-2590-510-1 BAND ASSY, HEAD (SV) (US, CND, E, AUS, CH)

(See Note)
HB1 X-2590-511-1 BAND ASSY, HEAD (SV) (AEP, UK) (See Note)
HJ1 X-2590-512-1 HOUSING (L) ASSY (SV) (Including Cable with jack)

(L-ch)

8

SECTION 4

ACCESSORIES

Ref. No. Part No. Description Remark

4-538-073-11 MANUAL, INSTRUCTION

(ENGLISH, FRENCH, SPANISH) (US, CND)

4-538-073-21 MANUAL, INSTRUCTION

(ENGLISH, FRENCH, GERMAN, SPANISH,

DUTCH, ITALIAN, PORTUGUESE, POLISH,

GREEK, CZECH, HUNGARIAN, BULGARIAN,

SLOVAK, SLOVENIAN, ROMANIAN) (AEP, UK)

4-538-073-31 MANUAL, INSTRUCTION

(ENGLISH, RUSSIAN, TRADITIONAL CHINESE,

KOREAN, UKRAINIAN) (E, AUS)

4-538-073-41 MANUAL, INSTRUCTION (SIMPLIFIED CHINESE)

(CH)

MDR-Z7

501 1-566-410-41 ADAPTOR, PLUG (Gold-plated unimatch plug

502 1-848-516-11 CABLE WITH PLUG (Headphone cable

502 1-848-516-21 CABLE WITH PLUG (Headphone cable

503 1-848-517-11 CABLE WITH PLUG (BALANCED)

503 1-848-517-21 CABLE WITH PLUG (BALANCED)

501

Gold-plated unimatch plug adaptor
(stereo phone plug y stereo mini jack)

502

Headphone cable
(Approx. 3 m, silver-coated OFC strands, gold-plated stereo mini plug)

adaptor (stereo phone plug y stereo mini jack))

(Approx. 3 m, silver-coated OFC strands,

gold-plated stereo mini plug)) (AEP, UK)

(Approx. 3 m, silver-coated OFC strands,

gold-plated stereo mini plug))

(US, CND, E, AUS, CH)

(Balanced-connection headphone cable

(Approx. 2 m, silver-coated OFC strands,

3-pole mini plug x 2)) (AEP, UK)

(Balanced-connection headphone cable

(Approx. 2 m, silver-coated OFC strands,

3-pole mini plug x 2)) (US, CND, E, AUS, CH)

503

Balanced-connection headphone cable
(Approx. 2 m, silver-coated OFC strands, 3-pole mini plug × 2)

9

MDR-Z7

REVISION HISTORY

Ver. Date Description of Revision

1.0 2014.09 New