Service Manuals, User Guides, Schematic Diagrams or docs for : Sony HiFi Service Bulletin HFP0436

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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.)

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