Table Of Contents; General - Sony MDR-RF920R Service Manual

MDR-RF920R/RF960R
Specifications ............................................................................ 1
1. GENERAL
................................................................... 2
2. DISASSEMBLY
2-1. Disassembly Flow ................................................... 3
2-2. Front Plate (R) Assy ................................................ 3
2-3. Front Plate (L) Assy ................................................ 4
2-4. SW Board ................................................................ 5
2-5. How to Hang The Tension Spring ........................... 5
3. ELECTRICAL ADJUSTMENTS
3-1. Free Run Frequency Check and Adjustment ........... 7
3-2. Receive Frequency Check and Adjustment ............ 7
3-3. Carrier Modulation Check ...................................... 7
5
Turn up the volume to a moderate
level with the VOL control.
A MDR-RF960R
Press the TUNE button briefly for
automatic tuning of the headphones.
If you do not receive a clear audio
signal, press it again.
VOL control
B MDR-RF920R
Tune the headphones into the frequency
of the transmitter with the TUNE
control until you can hear the audio
signal loud and clear.
VOL control
Follow steps 3 and 5 above until the
receiving performance becomes better.
2

TABLE OF CONTENTS

4.
4-1. Block Diagrams ............................................................... 11
4-2. Schematic Diagram - RX-Base Section (RF920R)- ...... 12
4-3. Schematic Diagram - RX-Base Section (RF960R)- ...... 13
4-4. Printed Wiring Boards- RX-Base Section- .................... 14
4-5. Schematic Diagram - RX-FE Section- ........................... 15
.......................... 7
4-6. Printed Wiring Boards- RX-FE Section- ....................... 16
5.
6.
SECTION 1

GENERAL

TUNE
button
TUNE
control
3-4. Separation Check .................................................... 7
3-5. Free Run Frequency Check and Adjustment ........... 8
3-6. Receive Frequency Check and Adjustment ............ 8
3-7. Carrier Modulation Check ...................................... 8
3-8. Separation Check .................................................... 8
DIAGRAMS
EXPLODED VIEWS
................................................. 17
ELECTRICAL PARTS LIST
This section is extracted
from instruction manual.
The headphones automatically turn
off when the y are taken off
- Auto power on/off function
Do not pull up the self-adjusting band when not
in use, as this will consume the battery power.
Flexible Circuit Board Repairing
• Keep the temperature of the 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
.................................. 18