Electronics > Repair

TDS6804B failed to power up repair

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pasta2018:
I was also very Confusion. At first, I left the power supply disconnected from anything, and the power supply could start up. But then I couldn't start it later. I suspect the power supply is unstable. It hasn't been repaired yet.

calibrationfixture:
Hi pasta2018,

" The chip on the right of Dallas is labeled Y540, which I guess is a crystal oscillator. "

Y is indeed Tektronix nomenclature for a X-tal Oscillator. See for example page 9-58 from the 070-6863-01 2465B and 2467B Series Service Manual.

By the way U520 is a Dallas DS1245W-100. This is a 3.3V Device contrary to DS1245Y's.

Calibrationfixture

pasta2018:
Thank you. The problem at the moment is that the psu does not start, there is no circuit drawing, and it is difficult for me to repair the power supply

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