Ir para o conteúdo principal

Repair and disassembly information for amplifiers in home audio systems.

102 Perguntas Visualizar todos

shake 33 power amp in protect e01

I have a Sony Shake33.

It is stuck in protect e01.

The repair manual says that it could the main amp board or the power supply. Here is the description: "The overcurrent condition to MOSFET occurs by a defect of MOSFET or defect of PS output line."

So I want to check the power supply first. Since I cannot power up the amp as it disconnects on boot, I can unplug it as it is modular and it boots fine. The test procedure doesn't require high-end testing equipment just a multimeter. The readings on the pins that come from the power supply are all good with the exception of the 1 st pin. It shows -22V when it should be 16V~23V. The actual power supply schematic says "pin1: V3+ (DC+16V~23V) _ (ref-V1)".

My question is what is V3 and ref-V1 from the above formula? Am I testing this correctly?

Responder a esta pergunta Também tenho esse problema

Esta pergunta é pertinente?

Pontuação 1
Adicionar um comentário

1 Resposta

Pergunta Mais Útil

The most common failure would of one or more of the output MOSFETs. With the power disconnected and the unit opened up, check the MOSFETs with a diode checker looking for shorts. I suspect that you will find one or more outputs to be shorted. Change both for whatever channel is bad.

Let us know what you find.

Dan

Esta resposta foi útil?

Pontuação 1
Adicionar um comentário

Adicionar a sua resposta

Mark V será eternamente grato(a).
Exibir estatísticas:

Últimas 24 horas: 0

Últimos 7 dias: 13

Últimos 30 dias: 56

Duração total: 2,443