The Multimeter Junkie repairs a Sony STR-DE635 surround receiver.
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Sony Service Company - Technical Services A Division of Sony Electronics Inc. Sony Drive, Park Ridge, New Jersey 07656
Subject: Output Transistor Failure Symptom: (11)
Date: May 1, 1995
Output Transistors fail, sometimes repeatedly, after replacement.
After replacing the defective output transistors, and any other defective components, change the value of the resistors as noted below. REF FORMER DESCRIPTION R707 R .3K OHM 1/4 WATT 3.3K OHM 1/4 WATT PART NUMBER 1-249-423- -249-423-11 NEW DESCRIPTION 15K OHM 1/4 WATT 15K OHM 1/4 WATT PART NUMBER 1-249-431- -240-431-11
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 ...