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CONFIDENTIAL
Sony Service Company National Technical Services A Division of Sony Electronics Inc. Park Ridge, New Jersey 07656
CSA-13
Service Bulletin Hi-Fi Products
No.
Model:
TA-AV521, TA-AV621
341R1
Subject: Audio Cuts Out, Unit In Protect - R807 & R857 Symptom: (51)
Date: August 9, 1996
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 DESCRIPTION R807 R857 220 OHM, 5%, 1/4W 220 OHM, 5%, 1/4W PART NUMBER 1-249-409-11 1-249-409-11 DESCRIPTION 560 OHM, 5%, 1/4W 220 OHM, 5%, 1/4W NEW PART NUMBER 1-249-414-11 1-249-414-11
Reference: FPR- O1105
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