Sony MDR-RF450 Service Manual
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Sony MDR-RF450 Service Manual

Wireless stereo headphones
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MDR-RF430/RF450
SERVICE MANUAL
Ver 1.0
1998.06
MDR-RF430 is the component model block one in the MDR-RF430RK.
MDR-RF450 is the component model block one in the MDR-RF450RK.
COMPONENT MODEL NAME FOR MDR-RF430RK/RF450RK
MDR-RF430RK MDR-RF450RK
Wireless Headphones
MDR-RF430
Transmitter
TMR-RF450R
MICROFILM
Illustration : MDR-RF430
MDR-RF450
TMR-RF450R
SPECIFICATIONS
Headphone
Charging and using hours
Approx. charging hours
Approx. using time*
1
50 minutes
24**
20 hours
*
at 1kHz 1mW + 1mW output
** the hours required to fully charge empty batteries
Battery life
Battery
Approx. hours*
Sony alkaline battery LR6 (SG) 60
Sony battery R6P (SR)
30
*
at 1kHz 1mW + 1mW output
Power source
DC 3V : 2 x R6 (size AA) battery or 2 x supplied
NC-AA-HJ Ni-Cd rechargeable battery
Mass
Approx. 215g (7.6oz.) incl.Ni-Cd batteries (MDR-RF430RK)
Approx. 265g (9.4oz.) incl.Ni-Cd batteries (MDR-RF450RK)
Supplied Ni-Cd rechargeable batteries
Model name
NC-AA-HJ
Voltage
1.2V
Capacity
600mAh
Design and specifications are subject to change without notice.
Illustration : MDR-RF450
WIRELESS STEREO HEADPHONES
AEP Model

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  • Page 1 Ver 1.0 1998.06 Illustration : MDR-RF430 Illustration : MDR-RF450 MDR-RF430 is the component model block one in the MDR-RF430RK. MDR-RF450 is the component model block one in the MDR-RF450RK. COMPONENT MODEL NAME FOR MDR-RF430RK/RF450RK MDR-RF430RK MDR-RF450RK Wireless Headphones MDR-RF430 MDR-RF450...

  • Page 2: Section 1 Disassembly

    SECTION 1 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. MDR-RF430 1-1. RX BOARD, FE BOARD, RECEIVER (R-CH), SUSPENDER REMOVAL Head band 5 RX board FE board 9 Screw (M1.7x4) Suspender Spacer !¶ Hanger (R) !º 2 Screws +P 2x10 7 Remove !¡...
  • Page 3 MDR-RF450 1-1. RECEIVER (R-CH), RX BOARD, FE BOARD, SUSPENDER ASSY REMOVAL Head band !£ Remove solder Surpport switch Hanger (R) RX board !¶ SW board !¢ !¡ !§ Suspender FE board !™ Screw !∞ (M1.7x4) Claw 6 Screws +P 2x8 Hanger cover (R) 7 Screws (M1.7x4)

  • Page 4: Electrical Adjustments

    6. Adjust the VOL (RV301) so that the RX boar d L-c h speaker TMR-RF450R outputs (both sides of MDD01) are 155mVrms. MDR-RF450 7. Connect an digital voltmeter (AC range) and oscilloscope to the R-ch speaker outputs (both sides of MDD02) and measure Setting : the voltages.
  • Page 5 Connection points : digital voltmeter (AC range) [ RX BOARD ] (Conductor side) oscilloscope digital voltmeter (DC range) oscilloscope Adjustment Location : [RX BOARD] (Component side) RV302 Tuning Knob RV301 VOL Knob RV303 : Separation Adjustment L301 : Receive Frequency Adjustment –...

  • Page 6: Ic Block Diagrams

    SECTION 3 DIAGRAMS IC BLOCK DIAGRAMS IC301 CXA1611N-T4 FM•IF TUNING RIPPLE REGULATOR DISCRI METER FILTER DETUNE AM•FE AM•IF DET•AGC FM•FE IC302 LA4533M POWER MUTE 10 MT/SW P/SW SWITCH CIRCIUT AMP1 OUT1 BIAS PRE GND POWER GND AMP2 OUT2 – 6 –...
  • Page 8 MDR-RF430/RF450 3-2. SCHEMATIC DIAGRAM Refer to page 6 for IC Block Diagrams. Note: WAVEFORM • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. • All resistors are in Ω and W or less unless otherwise specified.

  • Page 9: Section 4 Exploded Views

    SECTION 4 EXPLODED VIEWS NOTE : • -XX, -X mean standardized parts, so they • The mechanical parts with no reference may have some difference from the original number in the exploded views are not one. supplied. • Items marked “ * ”are not stocked since they •...
  • Page 10 4-2. MDR-RF450 70 72 MDD01 MDD02 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-977-785-01 PAD, EAR 4-999-771-01 SUSPENDER X-4950-101-1 PLATE (R) ASSY, FRONT 4-978-518-02 BASE, SUSPENDER 4-999-768-01 COVER (L), HANGER 4-999-774-01 REGISTER, HOUSING 4-999-773-01 HOUSING (R)

  • Page 11: Section 5 Electrical Parts List

    SECTION 5 ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS When indicating parts by reference num- In each case, u : µ , for example : parts list may be different from the parts ber, please include the board.
  • Page 12 6.8K 1/16W R349 1-216-001-00 METAL CHIP 1/10W R350 1-216-823-11 METAL CHIP 1.5K 1/16W R360 1-216-837-91 METAL CHIP 1/10W Sony Corporation 98F027539-1 Printed in Hungary © 1998.6 9-924-917-11 Personal A&V Products Company Published by Quality Engineering Dept. – 14 – (Shibaura)

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