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STK IC Tester
I got one Sony FH-909R for service, with the complaint ‘no audio output’. On checking, it was found that the STK4152MkII was getting hot and high voltages were present in the speaker outputs, activating the speaker protection relay to shut it off. From my experience and after doing some preliminary check-ups, and also after noticing that the 34 V DC (dual supply) was dropping to 24V, I concluded that the STK is defective. So, ordered for one from UTSource and got it recently.
But on replacing the IC, the result was same! So, I suspected that it could be a fake IC, as is common in the market. Later, better sense prevailed in me and I thought why not I build one STK Checker, with a readily available assembled PCB made by Sri Guru, Delhi-6.This has all the leads etched in PCB pattern itself, and looked like a good one. Please see pictures below:
Now, the main draw back will be soldering the 18 pins on to this board every time and de-soldering it. As we all know, the board will not last longer. So, the next idea struck me as to why should I not provide an IC socket? But getting an 18 PIN single line IC socket is almost impossible. So, what I did was picking up an 18 pin dual line IC socket, cut it into two and solder it on to the board! Before that I checked whether the IC pins are properly aligned to go into this socket and found it was a perfect fit. Please see picture:
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You may check on his previous repair article below: