Sony MDR-RF920R Service Manual
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Sony MDR-RF920R Service Manual

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MDR-RF920R/RF960R
SERVICE MANUAL
Ver 1.0 2004. 02
MDR-RF920R is the component model block one in the MDR-RF920RK.
MDR-RF960R is the component model block one in the MDR-RF960RK.
COMPONENT MODEL NAME FOR MDR-RF920RK/
MDR-RF960RK
Wireless Stereo Headphones MDR-RF920R
Transmitter
Sony Corporation
9-877-525-01
Personal Audio Company
2004B02-1
Published by Sony Engineering Corporation
© 2004.02
Photo : MDR-RF960R
MDR-RF920RK MDR-RF960RK
MDR-RF960R
TMR-RF960R
TMR-RF960R

SPECIFICATIONS

Headphones
Power source
Supplied rechargeable nickelmetal
hydride batteries BPHP550 or commercially
available (size AAA) dry batteries
Mass
Approx. 270 g (9.6 oz.) incl.
batteries
Design and specifications are subject to change without notice.
Canadian Model
HEADPHONES
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Summary of Contents for Sony MDR-RF920R

  • Page 1: Specifications

    MDR-RF920R/RF960R SERVICE MANUAL Canadian Model Ver 1.0 2004. 02 Photo : MDR-RF960R MDR-RF920R is the component model block one in the MDR-RF920RK. MDR-RF960R is the component model block one in the MDR-RF960RK. COMPONENT MODEL NAME FOR MDR-RF920RK/ MDR-RF960RK MDR-RF920RK MDR-RF960RK...

  • Page 2: Table Of Contents

    VOL control Flexible Circuit Board Repairing • Keep the temperature of the soldering iron around 270°C B MDR-RF920R during repairing. • Do not touch the soldering iron on the same conductor of Tune the headphones into the frequency the circuit board (within 3 times).

  • Page 3: Disassembly

    MDR-RF920R/RF960R SECTION 2 DISASSEMBLY • This set can be disassembled in the order shown below. 2-1. DISASSEMBLY FLOW 2-2. Front Plate (R) assy (Page 3) 2-3. Front Plate (L) assy 2-4. SW baord (Page 4) (Page 5) Note: Follow the disassembly procedure in the numerical order given.

  • Page 4: Front Plate (L) Assy

    MDR-RF920R/RF960R 2-3. FRONT PLATE (L) ASSY 7 Remove solder (4 places) to SW board housing (L) sub assy 8 RX BATTERY board to RX-BASE board 5 tow screws (DIA. 2) driver (L-CH) 4 Remove solder (2 places) 2 three screws (+B2.6)

  • Page 5: Sw Board

    MDR-RF920R/RF960R 2-4. SW BOARD 4 hunger (L) 6 SW board 2 hunger (L) 3 two screws (B2.6) 1 two screws (B2.6) housing (L) sub assy 2-5. HOW TO HANG THE TENSION SPRING Note for installation : Insert the end of the suspender assy under the S101 on the SW board.
  • Page 6 MDR-RF920R/RF960R SET THE LEAD WIRES Set the each lead wires as illustrated below. wires wire wires housing (R) housing (L) (L-CH) (R-CH) groove wires head band...

  • Page 7: Electrical Adjustments

    MDR-RF920R Notes: Setting : 1. Use transmitter with check and adjustment alreadycompleted. OSCILLOSCPE 2. On adjusting the headphones section, use the transmitter as a jig. Headphones: MDR-RF920R Transmitter: TMR-RF960R IC301 pin6 IC301 pin4 – – Procedure: 1. Connect an oscillator with attenuator and terminator (600 Ω) 3-3.

  • Page 8: Free Run Frequency Check And Adjustment

    MDR-RF920R/RF960R MDR-RF960R Notes: 13. Set the transmitter CHANNEL switch to 1. 1. Use transmitter with check and adjustment alreadycompleted. 14. Push the headphones tuning switch (S301) to receive radio 2. On adjusting the headphones section, use the transmitter as a frequency.
  • Page 9 MDR-RF920R/RF960R Digital voltmeter OSCILLOSCPE (AC range) L+ / R+ IC301 pin4 L– / R– – L– – – Asjustment Location : RX-BASE BOARD (Conductor side) IC301 4 IC301 7 (Connect 33k Ω resistor) TP(VT) power line (DC +2.4V) Q302 TUNE...
  • Page 10 MDR-RF920R/RF960R RX-BASE BOARD (Component side) RV301: Free Run Frequency Adjustment RV301 CT1: L301 S301: TUNE (RF960R MODEL) S301...

  • Page 11: Diagrams

    MDR-RF920R/RF960R SECTION 4 DIAGRAMS 4-1. BLOCK DIAGRAM RX-BASE BOARD L302 IF AMP/DECODE FE UNIT ANT301 IC301 ANTENNA (FRONT END) POWER AMP RF AMP FM IF/ DECODE FM FE SPEAKER IC302 DISCRI R-CH L-CH CF301 DETECT IC304 R-CH MUTE SPEAKER DETUNE...

  • Page 12: Schematic Diagram - Rx-Base Section (Rf920R)

    MDR-RF920R/RF960R 4-2. SCHEMATIC DIAGRAM – RX-BASE SECTION (RF920R) –...

  • Page 13: Schematic Diagram - Rx-Base Section (Rf960R)

    MDR-RF920R/RF960R 4-3. SCHEMATIC DIAGRAM – RX-BASE SECTION (RF960R) –...

  • Page 14: Printed Wiring Boards- Rx-Base Section

    MDR-RF920R/RF960R 4-4. PRINTED WIRING BOARD – RX-BASE SECTION – RX-FE BOARD BOARD • Semiconductor (Page 16) Location Ref. No. Location 1-689-785- D201 (11) D301 RX-BATTERY BOARD D303 ANT301 D304 RX-BASE BOARD S202 IC201 S201 IC301 (RECHARGEABLE (RECHARGEABLE IC302 BATTERY DETECT)

  • Page 15: Schematic Diagram - Rx-Fe Section

    MDR-RF920R/RF960R 4-5. SCHEMATIC DIAGRAM – RX-FE SECTION – • IC Block Diagram IC302 LA4533M-TE-L-E Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 16: Printed Wiring Boards- Rx-Fe Section

    MDR-RF920R/RF960R 4-6. PRINTED WIRING BOARD – RX-FE SECTION – (SIDE A) RX-FE BOARD 1-688-206- (21) (SIDE B) RX-FE BOARD RX-BASE BOARD (Page 14) (21) 1-688-206- • Semiconductor Note on Printed Wiring Boards: • X : parts extracted from the component side.

  • Page 17: Exploded Views

    MDR-RF920R/RF960R SECTION 5 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • Hardware (# mark) list and accessories are have some differences from the original one. given in the last of this parts list. • Items marked “*” are not stocked since they are seldom required for routine service.

  • Page 18: Electrical Parts List

    MDR-RF920R/RF960R SECTION 6 RX-BASE RX-FE ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS When indicating parts by reference parts list may be different from the parts All resistors are in ohms. number, please include the board.
  • Page 19 MDR-RF920R/RF960R RX-BASE RX-FE Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C351 1-165-908-11 CERAMIC CHIP < TRANSISTOR > C357 1-162-970-11 CERAMIC CHIP 0.01uF C358 1-162-964-11 CERAMIC CHIP 0.001uF 8-729-040-64 TRANSISTOR 3SK309XV-TL (RF960R) 8-729-209-45 TRANSISTOR 2SC3120-TE85R C361...
  • Page 20 MDR-RF920R/RF960R RX-BASE RX-FE RX-BATTERY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R349 1-216-833-11 METAL CHIP 1/10W Q202 8-729-901-81 TRANSISTOR 2SC2412K-T-146-R (RF960R) R351 1-216-845-11 METAL CHIP 100K 1/10W < RESISTOR > (RF960R) R201 1-216-833-11 METAL CHIP...
  • Page 21 MDR-RF920R/RF960R MEMO...

  • Page 22: Revision History

    MDR-RF920R/RF960R REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision...

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