Sony MDR-RF875RK User manual

MDR-RF875R
AEP Model
UK Model
SERVICE MANUAL
HEADPHONES
Headphones MDR-RF875R
Transmitter TMR-RF875R
MDR-RF875R is the component model block one in the MDR-RF875RK.
COMPONENT MODEL NAME FOR MDR-RF875RK
SPECIFICATIONS
Headphones
Power source DC 2.4 V: Built-in rechargeable
battery
Mass Approx. 350 g (12.25 oz.) incl.
built-in rechargeable battery
Built-in Ni-MH rechargeable battery
Model name NH-AAC
Voltage 1.2 V
Capacity 1,000 mAh
Design and specifications are subject to change without
notice.
Ver 1.0 2000. 08

— 2 —
SECTION 1
GENERAL This section is extracted
from instruction manual.
5 Turn up the volume to a moderate
level with the VOL control.
Press the TUNING button briefly for
automatic tuning of the headphones.
If you do not receive a clear audio
signal, press it again.
Try the above steps 3 and 5 until the
receiving performance becomes better.
Auto power on/off function
When you remove the headphones from your
head, the power turns off automatically. Do not
allow the self adjusting band to be pulled up,
otherwise the headphones will be switched on.
The power turns on.
Note
If a hissing noise is heard move closer to the transmitter.
TUNING
VOL control
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 270˚C
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.

— 3 —
SECTION 2
DISASSEMBLY
2-1. DRIVER (R SIDE), RX-BASE BOARD
Note : Follow the disassembly procedure in the numerical order given.
•The equipment can be removed using the following procedure.
Driver (R side), RX-BASE board
Driver (L side), Hanger (L)
Set SW board, Harger (R)
Holder (L)
Holder (R)
Four
claws
RX-BASE board
SW board
SW board
(Housing (R) side)
Housing (R)
Solder the each leads directly to the position as shown
while being cautions of colors.
Set the each leads as illustrated below.
Precaution for installtion
Precaution for installtion
Precaution for installtion
Head band
assy (front)(natural)
Head band
assy (front)(black)
Head band
assy (rear)(green)
Head band
assy (rear)(natural)
Driver (red)
Driver (natural)
Red Natural
From RX-BASE board.
From head
band assy (front).
From head
band assy (rear).
From
SW board.
Driver (R side)
ANT
qa RX-BASE board
0 Remove the
eight solderings.
2 Four screws (M 2 × 5)
1 Ear pad
4 Ear pad holder (R)
3 Front plate (R) assy
6 Driver
8 Charge terminal
9 Volume knob
5 Remove the
two solderings.
7 Remove the
two solderings.
Groove
Groove
Groove
Groove

— 4 —
2-2. SW BOARD, HANGER (R)
2 Housing (R)
5 Holder lid (R)
3 Holder (R)
8 SW board
SW board
3 Hanger lid (R)
9 Hanger (R)
Hanger (R)
1
1
Precaution for installtion
Set the each leads as illustrated below.
7 Remove the
two solderings.
4 Two screw
s
(P 2 × 8)
1 Screw (P 2 × 8)
2 Spring
4 Head cushion assy
6 Shassis
5 Two screws
(P 2
× 8)
7 Head band assy (rear)
8 Head band assy (front)
From head
band assy (front).
From head
band assy (rear).
From
SW board.
Groove
Groove Groove
Groove
Groove
Groove
6
2-3. HOLDER (R)

— 5 —
2-4. DRIVER (L SIDE)

Housing (L)
Set the each leads as illustrated below.
Precaution for installtion
Precaution for installtion
Green Natural
Green
Natural
From head band assy (rear).
From head
band assy (front).
From head
band assy (rear).
Driver (L side)
2 Four screws (M 2 × 5)
1 Ear pad
6 Ear pad
holder (L)
3 Front plate (L) assy
8 Driver
Four
claws
7 Remove the
two solderings.
4 Two nickle
hydrogen batterys
5 Remove the
two solderings.
Groove
Groove