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S CONFIDENTIAL CSV-1
Sony Service Company
National Technical Services Service Bulletin
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656 TV Products
Model: KV-20M42, KV-20S90 No. 535
Subject: Potential 30MHz Interference Date: May 17, 2001
Symptom:
(1341) When the TV is on; other devices may pick up interference from the TV.
Solution: In order to improve the slight possibility of interference at 30MHz a Ferrite Core has to
be added to the AC cord at the end closest to the rear cabinet. See fig 1
Ferrite Core
Fig 1
Loop the AC
cord around
the Core and
then snap it
Model Description Part Number Serial Number
range that need
this Ferrite Core
KV-20M42 Ferrite Core 1-500-386-11 4170001-4175650
KV-20S90 Ferrite Core 1-500-386-11 4000001-4000150
Reference: PCN 604299 PRINTED IN USA
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