Question about Sony TA-E9000ES Amplifier
I noticed the protect display was on several times and now the power goes through but no display appears.
The power supply is the main culprit for most of the TA-E9000ES failures. Symptoms of this are no sound and a very dim or no display. Apparently the power board has several weaknesses which have caused Sony to supply a modified version in later production units. The circuit around transistors Q108 and Q109 are prone to oscillation, which will cause one or both transistors to break down, as well as resistor R124. This resistor is originally a surface mounted device capable of 1/10 watts of heat dissipation. The modification suggested by Sony is to replace this 4.7 k ohm resistor with a 1 watt rated version. Also, to prevent further oscillations a 100 pF capacitor is added in parallell with R153. (Some suggests that also transistor Q110 is a candidate for replacement.) The US issued service bulletin from Sony suggest that this fault may occur with units having a serial number in the range 800001 - 802746.
Serial numbers 80#### are for the US/Canadian version.
Serial numbers 50#### are for the european version."
Posted on Sep 10, 2008
I have a 9000 es with the same problem. R124 was in fact burnt. i will replace it with 1 watt resistor and put the 100pf cap across R153, but what type - ceramic/electrolytic etc and what voltage cap is needed. Also do we need to replace Q108, 109 and 110 if they are not bad ?
Posted on Oct 03, 2015
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Posted on Jan 02, 2017
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