MDR-IF4000
US Model
Canadian Model
AEP Model
E Model
SERVICE MANUAL
CORDLESS STEREO HEADPHONE
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-879-301-02
2005B02-1
© 2005.02
SPECIFICATIONS
Ver. 1.1 2005. 02
General
Modulation System
DQPSK-IM
Secondary carrier wave frequency
3.75 MHz
Playback frequency range
10 22,000 Hz
Power requirements
Rechargeable nickel-metal hydride
batteries (supplied) or commercially
available (size AAA) alkaline batteries
Mass Approx. 300 g (11 oz) (including the
supplied rechargeable nickel-metal
hydride batteries)
Supplied accessories
Rechargeable nickel-metal hydride
batteries
BP-HP550 (550 mAh min.) (2)
Operating Instructions (1)
Design and specifications are subject to change without notice.
· The MDR-IF4000 is the cordless stereo
headphones that comprises the MDR-
DS4000.
· MDR-DS4000 consists of the following models respectively.
Cordless stereo headphone
MDR-IF4000
Digital surround processor
DP-IF4000
2
MDR-IF4000
TABLE OF CONTENTS
Specifications ............................................................................ 1
1.
GENERAL ................................................................... 3
2.
DISASSEMBLY
2-1.
Disassembly Flow ........................................................... 4
2-2.
Front Plate (R) Assy ........................................................ 4
2-3.
RX Board ......................................................................... 5
2-4.
Hunger (R) ....................................................................... 5
2-5.
Wiring On The Right Side ............................................... 6
2-6.
Front Plate (L) Assy ........................................................ 6
2-7.
Batt Board ........................................................................ 7
2-8.
Hanger (L) ....................................................................... 7
2-9.
Wiring On The Left Side ................................................. 8
2-10. Hunger Lid (L) ................................................................ 8
2-11. Wiring On The SW Board ............................................... 9
2-12. How To Hang The Tension Spring .................................. 9
3.
DIAGRAMS
3-1.
Circuit Boards Location .................................................. 10
3-2.
Block Diagrams ............................................................... 11
3-3.
Printed Wiring Board Receiver Section .................... 12
3-4.
Printed Wiring Board Power Section ........................ 13
3-5.
Schematic Diagram Receiver Section ....................... 14
4.
EXPLODED VIEWS
4-1.
Housing (L) Assy Section ................................................ 17
4-2.
Housing (R) Assy Section ............................................... 18
5.
ELECTRICAL PARTS LIST .................................. 19
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.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
·Unleaded solder melts at a temperature about 40
°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350
°C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
· Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
· Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
· Repaier DP-IF4000 with MDR-IF4000.
3
MDR-IF4000
SECTION 1
GENERAL
This section is extracted
from instruction manual.
LOCATING THE CONTROLS
1
Ear pad (left)
2
Battery case button
3
Battery case
Press the button of the left housing to
open the battery compartment lid.
This battery case is for the rechargeable
nickel-metal hydride batteries (supplied)
or commercially available (size AAA)
alkaline batteries only.
4
Infrared sensor
There are infrared sensors in two
locations on both sides.
5
Self-adjusting band
The headphones automatically turn on
when you put them on.
6
VOL (Volume) control
Use to adjust the volume.
7
Ear pad (right)
8
POWER indicator
By pulling up the self-adjusting band, the
indicator lights red when battery power is
sufficient.
4
MDR-IF4000
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-2.
FRONT PLATE (R) ASSY
· This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
2-2. FRONT PLATE (R) ASSY
(Page 4)
2-6. FRONT PLATE (L) ASSY
(Page 6)
2-3. RX BOARD
(Page 5)
2-4. HANGER (R)
(Page 5)
2-7. BATT BOARD
(Page 7)
2-8. HANGER (L)
(Page 7)
2-10.HANGER LID (L)
(Page 8)
2-9. WIRING ON THE
LEFT SIDE
(Page 8)
2-11.WIRING ON THE
SW BOARD
(Page 9)
2-12.HOW TO HANG
THE TENSDION
SPRING
(Page 9)
2-5. WIRING ON THE
RIGHT SIDE
(Page 6)
SET
1
ear pad (R)
4
Removal the solder at 2 places.
2
two screws
(P 2.6x6)
3
screw (P 2.6x6)
5
front plate (R) assy
from RX board
driver (R-CH) side
housing (R) assy
Note for installation : Solder the leads at the
places shown below with
attention to their colors.
Connect a red lead to
the marked one of the
driver terminals.
natural
RED
5
MDR-IF4000
2-3.
RX BAORD
2-4.
HANGER (R)
2
1
Removal the solder at 9 places.
3
RX board
Note for installation : Solder the leads at the
places shown below with
attention to their colors.
housing (R) assy
to PD2 board
cushion (B)
to BATT board
and driver (L-CH)
to BATT board
and driver (L-CH)
to driver
(R-CH)
WHT
BLK
natural
natural
natural
RED
RED
GRN
GRN
5
hanger (R)
Pay attention to the leads
when assembling.
Pay attention to the leads
when assembling.
3
2
4
1
two screws (P2.6 x 6)
hanger lid (R)
projection