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TV Products CSV-1
Service Bulletin
Sony Service Company - Technical Services
A Division of Sony Electronics Inc.
Sony Drive, Park Ridge, New Jersey 07656

Model: KV-27TS29, KV-27TS32, KV-27TS36 No. 204R1
KV27TW77, KV-27TW78, KV-27V10, KV-27V15
KV-27V55, KV-32S12, KV-32S10, KV-32TS36
KV-32TS46, KV-32TW67, KV-32TW6
KV32TW77, KV-32TW78, KV-32V15, KV-32V16

Subject: Circuit Change To Reduce Channel Popping Date: May 15, 1996
Sound


Symptom:
(654) Popping sound is heard from the speakers during channel Up/Down or Mute
On/Off activation.



Solution: In rare occasions, the popping sound heard during channel Up/Down or Mute On/Off
may be objectionable to some customers even though the unit is working as
designed. Please reset the customers bass level control back to the mid range
position if the setting is at high. Also, the following circuit change will minimize the
popping sound level.

Note: Model KV-32TS46 contains some of the changes below. In some cases only the wire
additions and removal of the jumpers are needed.

1. Add the Following Parts to the "M" board.




Reference Description Part Number


R010 220 ohm 1-216-033-00
(Chip Component)

C011 220 PF 1-163-125-00
(Chip Component)




Cont.




Reference: SB204 PRINTED IN USA

PRINTED ON RECYCLED PAPER
TV Products Service Bulletin No. 204R1




2. Add the Following parts to the UA Board.




Reference Description Part Number


Q402 2SD-601A (Chip Type) 8-729-422-28

Q403 2SD-601A (Chip Type) 8-729-422-28

D413 RD-3.3ESB 8-719-109-66

R428 3.3K ohm (Chip Type) 1-216-061-00

R430 3.3K ohm (Chip Type) 1-216-061-00

R438 0 Ohm (Chip Type) 1-216-295-00

C423 1.0 MF/50V 1-124-903-11

3. Eliminate the following components from the "D" Board.
TV Products Service Bulletin No. 204R1




Reference Description

C2202 Jumper Wire (5 MM)

C2204 Jumper Wire (5 MM)




4. Add the Following wires between the "D" Board and "UA" Board.

Description Length Location Location
(From) (To)

Wire, AWG 24 or 26 11 inches C417 (-) C2204 (-)
UA Board "D" Board

Wire, AWG 24 or 26 11 inches C418 (-) C2202 (-)
UA Board "D" Board




Note: When soldering a chip component, if the soldering iron is applied for too long a time, the
heat from the iron can damage the chip component. A low heat soldering iron is available
through Sony Parts. Part Number J-6080-801-A