Sanyo MCDZX220m cassette desk no sound

[carolmaille]

Hello
Please can anyone help and give me some ideas?
Sanyo MCDZX220m cassette desk no sound except a buzz/drone but the mechanism works. I tried to trace the route of the sound and see some kind of wave seems to be on the chip TC4052B - a multiplexer - when cassette is selected - this is on the board with the output to the speaker. The speaker has a low resistance so I don't suppose it is faulty.
There is a TA8227 I dont know what this does and cant see a data sheet about it. Thank you
The LCD ? display for the CD player is blank and the CD controls dont work and no radio output either
It is for an elderly lady who wants to listen to her cassettes.

 

[Nigel Goodwin]

Thank you so much I will get and replace it with the 2.2 ohm when I can, I am not sure about this 16V input to the Voltage regulator when it ought to be 12V but I can see if it works and I guess not to leave on and go out. Run too hot? So that is overloading it - too much current going through it

It's a nominal 12V, and will be unregulated, so 16V is perfectly normal - the regulation is done after the 2.2 ohm resistor, although the high power circuits (like the output amplifiers) are fed directly from the incoming 12/16V supply, so as to give the most power. When it's turned up flat out, the 16V will probably drop closer towards 12V.

 

[carolmaille]

Thank you so much that is really good to know and reassuring - I will see if I can see that on the diagram too.