I could kick myself. Tektronix 603a
I picked up a piece of Tektronix kit today from and ignored the golden rule before powering it up. Check some numpty hasn't replaced the 600mA fuse with something stupid like a 10A slow blow.
I couldn't wait to fire up the storage monitor and when I did I got a dot on the screen and was able to shift it around so I thought "Nice" then it went dead after 5mins with a puff of smoke. One of the Sprague 3300uF 25V caps had shorted and because it had a nail for a fuse both tracks feeding the bridge rectifier for the +20v rail instantly disintegrated. Well I can fix it but it was a reminder to do some initial checks before getting too excited. Cheers |
Re: I could kick myself. Tektronix 603a
Easy mistake to make. I found tinfoil in a Heathkit counter fuse holder before. Usually Tek bridge rectifiers make pretty good fuses themselves (I've lost count of how many I've replaced) so that's a bit unlucky.
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Re: I could kick myself. Tektronix 603a
Yes. I've had a handful of Tek bridges go open circuited as well. Odd really, most other types fail short :-/
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Re: I could kick myself. Tektronix 603a
I say a lucky escape ! It could have been a lot worse , Mick.
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Re: I could kick myself. Tektronix 603a
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Re: I could kick myself. Tektronix 603a
Interesting that such bodges are made by users of this sort of gear, who might be expected to know better.
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Re: I could kick myself. Tektronix 603a
I think it was a reseller who replaced it thinking it would fix the no image not realising that the dot was off screen.
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