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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

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