Hi all,
hope life is treating you well.
I have a question, as I am genuinely puzzled.
There is this old Tektronix 2215 scope which has been laying around for some time, that I knew had some issue, but couldn't remember what...
Anyways, last night, I thought I'd give it a look, as space is needed, so put it on the bench and plugged it in.
The CRT had a terrible trace which only filled half the screen and didn't seem to respond much to any of the controls, so I decided to give it 15 minutes to warm up whilst I cleared up the bench a bit.
After maybe ten minutes, I heard the dreaded 'pffft-pfssss-pop' followed by the most almighty amount of smoke!
Even though I'd yanked the plug from the socket, there was so much smoke coming from the HV section, that I was expecting to see flames.. But no, just plumes of smoke.
I mean, I have an impressive record of toasting electronic components but I honestly don't remember such a dramatic event without flames.
As it sank in that that was a major fuck-up, I realised that at least the toasted component would indicate in which circuit the problem lay, so set about opening the HV section which is sandwiched between the main board and another smaller board which sits above.
Anyway... the point is, there was nothing burnt!
None of the caps had exploded, no resistor had roasted, no damage was done to any component or trace on either board. Not even the slightest scorch mark.
Weirder still, is that now the scope (almost) works fine. The intensity and beam finder aren't quite right and the display judders and jiggles around, but the CRT now shows full waveforms.
So what the fuck???
What am I missing?
hope life is treating you well.
I have a question, as I am genuinely puzzled.
There is this old Tektronix 2215 scope which has been laying around for some time, that I knew had some issue, but couldn't remember what...
Anyways, last night, I thought I'd give it a look, as space is needed, so put it on the bench and plugged it in.
The CRT had a terrible trace which only filled half the screen and didn't seem to respond much to any of the controls, so I decided to give it 15 minutes to warm up whilst I cleared up the bench a bit.
After maybe ten minutes, I heard the dreaded 'pffft-pfssss-pop' followed by the most almighty amount of smoke!
Even though I'd yanked the plug from the socket, there was so much smoke coming from the HV section, that I was expecting to see flames.. But no, just plumes of smoke.
I mean, I have an impressive record of toasting electronic components but I honestly don't remember such a dramatic event without flames.
As it sank in that that was a major fuck-up, I realised that at least the toasted component would indicate in which circuit the problem lay, so set about opening the HV section which is sandwiched between the main board and another smaller board which sits above.
Anyway... the point is, there was nothing burnt!
None of the caps had exploded, no resistor had roasted, no damage was done to any component or trace on either board. Not even the slightest scorch mark.
Weirder still, is that now the scope (almost) works fine. The intensity and beam finder aren't quite right and the display judders and jiggles around, but the CRT now shows full waveforms.
So what the fuck???
What am I missing?
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