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Up to now you are the BEST! Prompt-efficient and so reasonable ! I have been after SONY service manual for quite some time !Thank you very much ! I can recomend your service to
all my collegagues ! V.Bergfield .
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This is a very good quality print (scan) of the original SONY service manual. The original from Sony is on very thin paper. Nevertheless it is very clear and sharp and excellent readable. I'm very satisfied to have now this rare document. I've looking for it many years (infrequent). It contains very detailed circuit diagrams, exploded views, part lists, PCB view with good readable connection lines. Very recommended.
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A complete manual with all the needed details of calibrations and service instructions about the radio receiver.
A big deal.
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Fast delivery and good quality copy. To be recommended
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Excellent product, very clear print. Detailed circuit and assembly diagrams - this enabled me to repair my CD player with confidence. I highly recommend this site.
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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