Ver 1.1 1998.12
MICROFILM
MDR-7502
SERVICE MANUAL
STEREO HEADPHONES
SPECIFICATIONS
US Model
AEP Model
REVISED 3
Type
Supra-aural, closed
Driver units
30 mm dia., dynamic type
Impedance
45 ohms at 1 kHz (FORMER TYPE)
24 ohms at 1 kHz (NEW TYPE)
Sensitivity
100 dB/mW
Rated power
0.10 W
Power handling capacity
0.50 W
Frequency response
16 - 22,000Hz
Cord
2 m long with a stereo unimatch plug
Weight
Approx. 150 g (without cord)
2. WIRING DIAGRAM
2 Screws
(+P 2x4)
4
5
5
1
Front board
ASSY
Housing
Claws
3 Soldering
2 Screw
(+P 2x4)
Driver unit
L ch
Copper
GRN
R ch
Copper
RED
Marking
L ch
Copper
GRN
R ch
Copper
RED
Marking
FORMER TYPE
NEW TYPE
NEW TYPE
1. DRIVER UNIT INSTALLATION
Note :
Follow the installation procedure in the numerical
order given.
2
3. EXPLODED VIEW AND PARTS LIST
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.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
X-2113-123-1 PAD ASSY, EAR
2
X-2113-120-1 FRONT BOARD ASSY (030F014)
(FORMER TYPE)
2
X-4951-140-1 FRONT BOARD ASSY (030F030P) (NEW TYPE)
3
2-115-667-01 PAD, EAR
4
2-113-154-01 BUSHING
5
4-942-718-01 HOUSING
6
2-113-162-01 HANGER
7
7-685-102-19 SCREW +P 2X4 TYPE2 SLIT
8
X-2113-121-1 HEAD BAND ASSY
9
2-113-157-01 LID, HANGER
901
1-580-791-21 CORD
902
1-506-589-11 ADAPTOR, PLUG
************************************************************
ACCESSORIES & PACKING MATERIALS
*******************************
*
4-942-596-01 INDIVIDUAL CARD BOARD (NEW TYPE)
9-956-093-14
Sony Corporation
Personal A&V Products Company
98L0256-1
Printed in Japan © 1998.12
Published by Quality Engineering Dept.
(Shibaura)
3
1
1
902
901
2
4
4
5
5
6
6
8
7
7
7
7
3
7
7
2
9
9
(NEW TYPE)
not supplied
not
supplied
not
supplied
not
supplied
FORMER
TYPE