R205 100 ohm resistor in SR98 starting to get hot and smell

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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

Post by exxos »

Icky wrote: Fri Nov 16, 2018 11:14 am Question for Exxos - there is one cap left on the board C206 that does not have a replacement (see cap with dot on top in pic).
Does that also need replacing or is it worth replacing with a new one?
There is a huge thread on this somewhere, basically is purposely not changed..

I think the bottom line was, I tried ceramics, and all sorts on there, and mostly everything I did seem to make it worse if I remember rightly..

So oddly, it is actually better to leave that alone...
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

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exxos wrote: Fri Nov 16, 2018 11:18 am So oddly, it is actually better to leave that alone...
Thanks - "Don't fix what ain't broke" :)
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

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You got to watch those clips on the rectifier and heatsink. Mine just pinged off whilst applying pressure and hit the ceiling.
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

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Icky wrote: Fri Nov 16, 2018 11:23 am You got to watch those clips on the rectifier and heatsink. Mine just pinged off whilst applying pressure and hit the ceiling.
Sweet! :lol:
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

Post by Icky »

Just a note - the large rectifier the legs are a little too wide for the holes. Had to drill the original holes a fraction bigger to get the component in.
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

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Icky wrote: Fri Nov 16, 2018 11:46 am Just a note - the large rectifier the legs are a little too wide for the holes. Had to drill the original holes a fraction bigger to get the component in.
psu.JPG
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

Post by Icky »

exxos wrote: Fri Nov 16, 2018 11:48 am
Icky wrote: Fri Nov 16, 2018 11:46 am Just a note - the large rectifier the legs are a little too wide for the holes. Had to drill the original holes a fraction bigger to get the component in.
psu.JPG
Thanks Exxos - You are always one step ahead :)
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

Post by Icky »

DONE - Recapped and re-metal filmed

IMG_3283.png
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

Post by Icky »

Icky wrote: Tue Nov 13, 2018 11:10 pm Power lines under load before metal film resistor replacement:

+5V line= 4.85V
+12V line= 11.26V

Power lines under load after metal film resistor replacement:

+5V line = 4.84V
+12V line = 11.23V

More importantly R205 is not getting really hot and smelling. Thus have solved the heat and smell problem.
Finished measurements (under load) with metal film resistor replacement and recap:

+5V line = 4.92V
+12V line = 11.09V
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Re: R205 100 ohm resistor in SR98 starting to get hot and smell

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Icky wrote: Fri Nov 16, 2018 12:19 pm DONE - Recapped and re-metal filmed
:bravo:
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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People should find solutions to problems, not find problems with solutions.
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