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Well.. I'd searched for this manual and although I found many copies online I was pleased to find your website with a well balanced pricing system and easy to search and follow links. That together with the very quick response time was just what I was looking for.. being a very impatient tech.. ;-) I had the service manual in front of me within a short time.
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The service manual when downloaded and printed out was clear and easy to read. I would have liked to have been able to enlarge some details, but this was not possible as the file permissions did not allow this. The service was very good. The time taken from placing my order to downloading the document was only a few minutes.
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The manual is useful for trouble shooting for an old instrument. It saved money,and let me enjoy DIY.
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Perfect source of information for replacing the HDD and performing general diagnostics.
MDR-RF940R
Adjustment for Separation Preparation:
AF OSC AC voltmeter ATT + + � � TMR-RF940R Transmitter MDR-RF940R Headphones + �
600 �
input plug (Lch or Rch) 400 Hz 316 mVrms
speaker out (Lch or Rch)
Procedure: 1) Input a signal of 400 Hz 316 mVrms only to Lch of the adjusted transmitter. 2) Turn RV91 on the RX board so that the speaker out of Lch becomes 155 mVrms. 3) Turn RV61 on the RX board so that the speaker out of Rch becomes minimum. 4) At this time, confirm the separation between Lch and Rch should be over 18 dB. 5) Then, input a signal of 400 Hz 316 mVrms only to Rch of the transmitter. 6) At this time, confirm the separation between Rch and Lch should be over 18 dB. Adjustment Location: RX Board Confirmation without a spectrum analyzer Please confirm the units by following procedure shown below. Here a series of procedure which can be performed without a spectrum analyzer is introduced. Tuning frequency confirmation Preparation:
AF OSC DC voltmeter ATT + + � � TMR-RF940R Transmitter 5m MDR-RF940R Headphones RX Board TP2 + �
600 � input plug
Procedure: 1) Input any signal including music into TMR-RF940R and place the unit the point where is far from MDR-RF940R and place the unit in a location where is far from by 5 m. 2) Measure the DC voltage at the test point TP2 of RX board of MDR-RF940R. This DC voltage corresponds to the S-curve voltage of FM detection characteristics as shown below.
Spec. DC1.1 ± 0.1 V 0 f
AF signal or music
If tuned frequency is in the area covered by AFC, the center voltage changes when CT41 (channel 1) CT42 (channel 2) is turned. Adjustment Location:
[RX Board] � Side A �
PRINTED WIRING BOARD
� MDR-RF940R Service Manual page 5. (Location F � H, 4 � 6)
[RX Board] � Side A �
RV91 IC41 CT41 CT42 RV61
+ � DC voltmeter
Sony Corporation
9-923-238-81
Personal A&V Products Company
98E0539-1 Printed in Japan © 1998. 5 Published by Quarity Engineering Dept. (Shibaura)
�4�
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