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Old 12th Aug 2017, 11:17 pm   #1
backflipper
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Unhappy 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
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Old 13th Aug 2017, 11:23 am   #2
MrBungle
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Default 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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Old 13th Aug 2017, 2:39 pm   #3
evingar
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Default 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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Old 13th Aug 2017, 6:47 pm   #4
vinrads
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Default Re: I could kick myself. Tektronix 603a

I say a lucky escape ! It could have been a lot worse , Mick.
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Old 13th Aug 2017, 7:42 pm   #5
backflipper
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Default Re: I could kick myself. Tektronix 603a

Quote:
Originally Posted by MrBungle View Post
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.
Cheers but yes it did drive home the importance of initial checks.

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Originally Posted by vinrads View Post
I say a lucky escape ! It could have been a lot worse , Mick.
I agree. Safety 1st!
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Old 13th Aug 2017, 8:39 pm   #6
dseymo1
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Default 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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Old 13th Aug 2017, 9:17 pm   #7
backflipper
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Default 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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