hifi engine


Nobeal's picture



I'm working on the restoration of an AKAI AM_U55. No sound and the led PCB does not work. I changed the two STK 3042 and 2155 then I ordered a TA7317 because the relay slams still not... I think that after would remain me a few transistors...
When I changed the STK 2, the relay well slammed but ca did not last long and no sound.
Someone have an idea? Thank you


karodimitrov's picture

Re: restoration

Is there 0 V at terminals 2 and 3 of TA7317? You should measure and if necessary-adjust it.If they cannot be adjusted-the problem may be elsewhere.For example a bad capacitor.Or bad STK.
All the voltages are given in the service manual:
Page 69.Compare them with your voltages.