EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Teknow on March 28, 2021, 07:12:01 pm
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No sooner I bought a Tektronix 2465B than I started reading and immediately imitating without knowledge!
I set out buying and replacing the caps, mounting a heat sink on the notorious U800 without knowing if there's deficiency at all, and how much pressure the Chip can withhold before cracking inside while mounting!!!!.
I had little experience at that time and later on as I acquired knowledge and fun in measurement, I discovered the appliance needed calibration and I got the notorious problem of the X10, mainly the magnifier not working where the trace started disappearing immediately after pressing it or as soon as the U800 got hot. Things went worse as the U800 wouldn't work at all.
I sought for a solution but all in vain. There was a bulky engineered replacement: https://www.davmar.org/TE/Tek2465/lafay.html (https://www.davmar.org/TE/Tek2465/lafay.html)
But that was too expensive and inconvenient for me lots of hard to order chips.
I read about the baking adventure and feeling frustrated that was the only choice I had. So I embarked on the task of baking the chip.
At the beginning I mounted the chip in zipped position using some metal piece or aluminum and a goldsmith hand vise (see image please) and heated both the spanner and the chip with a heat gun and cooled both immediately in water. It worked OK but the magnification got back to blurring and consequently the trace faded away.
There were a few attempts like this but with similar results. Fortunately, I had success! How?
I brought wood clips for their metal bar and heated the bar on a gas stove for almost 450 -500 degrees Celsius before glowing red.
I didn't have in mind video recording as I had little hope. As soon as the bar got the heat I "felt, hoped, thought!!" is OK, I placed the U800 belly to hot bar and I spanned it to the bar with another spanner firmly (how many Newtons??) and cooled it almost immediately.
It worked great the X10 works fine, even the readout intensity and position got better. The appliance needs only calibration.