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Hi-Fi Products CSA-13
Service Bulletin
Sony Service Company - Technical Services
A Division of Sony Electronics Inc.
Sony Drive, Park Ridge, New Jersey 07656
Model: STRD311 No. 436
Subject: Output Transistor Failure Date: May 1, 1995
Symptom:
(11) Output Transistors fail, sometimes repeatedly, after replacement.
Solution: After replacing the defective output transistors, and any other defective components,
change the value of the resistors as noted below.
REF FORMER NEW
DESCRIPTION PART NUMBER DESCRIPTION PART NUMBER
R707 3.3K OHM 1/4 1-249-423-11 15K OHM 1/4 1-249-431-11
WATT WATT
R757 3.3K OHM 1/4 1-249-423-11 15K OHM 1/4 1-240-431-11
WATT WATT
Note: When replacing output transistors be sure to use a sufficient amount of heat
sink compound on the replacement device. Tighten the mounting screw with enough
force to firmly secure the transistor to the heat sink for adequate heat transfer.
In some instances the following 47uf 25V electrolytic capacitors, C709, 759, 704, and
754 were not mounted on the main board at the factory. Add these capacitors, part
number 1-124-477-11, before releasing the unit.
Reference: FPR-P PRINTED IN USA
Autoflagged - YES
PRINTED ON RECYCLED PAPER
Filename: HFP0436.SB
Directory: J:\SBDOC\MAY95
Template: C:\WINWORD\S_BULL.DOT
Title: STRD311 Service Bulletin
Subject: Output Modification
Author: Hoyt Wing Lee
Keywords:
Comments:
Creation Date: 05/01/95 11:13 AM
Revision Number: 2
Last Saved On: 05/01/95 11:13 AM
Last Saved By: Hoyt Wing Lee
Total Editing Time: 0 Minutes
Last Printed On: 04/01/96 9:41 AM
As of Last Complete Printing
Number of Pages: 1
Number of Words: 203 (approx.)
Number of Characters: 1,158 (approx.)