Service Manuals, User Guides, Schematic Diagrams or docs for : Sony HiFi Service Bulletin HFP0341

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                                           CONFIDENTIAL                                                   CSA-13
Sony Service Company
National Technical Services                Service Bulletin
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656               Hi-Fi Products
Model:           TA-AV521, TA-AV621                                                    No.       341R1
Subject: Audio Cuts Out, Unit In Protect - R807 & R857                                 Date: August 9, 1996


Symptom:
  (51)                  When operating in the SIMULATED or HALL SURROUND MODE, the Rear level is
                        set to 50% maximum level or greater and the Master Volume is turned up, the unit
                        goes into protect.



Solution:               Verify that the unit is being operated with speakers rated at 8 ohms. If the unit goes
                        into protect with 8 ohm speakers then replace resistors R807 (Rear Board) and R857
                        (Center Board) with the resistors shown in the chart below.

                              REF                  FORMER                                        NEW
                                      DESCRIPTION           PART NUMBER            DESCRIPTION     PART NUMBER

                             R807     220 OHM, 5%,           1-249-409-11          560 OHM, 5%,        1-249-414-11
                                          1/4W                                         1/4W
                             R857     220 OHM, 5%,           1-249-409-11          220 OHM, 5%,        1-249-414-11
                                          1/4W                                         1/4W




Reference: FPR- O1105                                                                                     PRINTED IN USA

                                                       PRINTED ON RECYCLED PAPER

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