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SONY MDRRF930
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY MDRRF930 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 5 (click to view)
SECTION 3 ELECTRICAL ADJUSTMENTS
Note: 1. The adjustments should be performed in the order given. 2. The transmitter (TMR-RF930) already checked and adjusted should be used.

3-1. Receiving Frequency Check and Adjustment
Preparation:

AF OSC ATT + + – – TMR-RF930 Transmitter MDR-RF930 Headphones

+ –

5m

600 Ω

AUDIO IN (Lch) 1 kHz 316mVrms

[RX-BASE board] – Conductor Side –

DC voltmeter

oscilloscope

+ –

Procedure: 1. Set the channel of the transmitter to CH2. 2. Turn OFF the noise filter switch on the transmitter. 3. Enter 1 kHz 316 mVrms signal only to the Lch on the transmitter. 4. Place the transmitter away from the headphone (MDR-RF930) more than 5 m. 5. Set the volume control (RV301) on the RX-BASE board to the minimum position. 6. Set the tuning control (RV302) on the RX-BASE board to the center position. 7. Connect a DC voltmeter and an oscilloscope between IC301 pin @¡ and ground on the RX-BASE board. 8. After confirming that demodulated 1 kHz waveform (about 13 mV) appears on the oscilloscope, check that the DC voltmeter indicates DC1 V to 1.2 V. 9. If demodulated 1 kHz waveform does not appear on the oscilloscope, or if the voltage is out of the specified value, adjust the air-core coil (L301) on the RX-BASE board so that the demodulated 1 kHz waveform appears on the oscilloscope, and under this condition, adjust finely the air-core coil (L301) so that the DC voltmeter indicates DC1.1 V. 10. Finally, check that signals are received when the channel is changed over to CH1/CH3 on the transmitter, then when the tuning control (RV302) on the RX-BASE board is rotated. Adjustment Location: RX-BASE board (See page 9.)

–5–

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