GreyHobbit Posted August 24, 2019 Share Posted August 24, 2019 I just recently purchased my first 800XL and was looking inside to see if any of the ICs were socketed. Most of the big ICs are, apart from the 6520 PIA, but the OS and Basic ROMs are soldered along with all of the smaller chips on the board. Anyway, while I was checking the other components, I noticed that C48 down at the front left side of the motherboard, next to the trim pot, is cracked and appears to have broken in two. There was a slight brown stain round one of the solder joints, like corrosion but it doesn't seem too bad. The 800XL appears to be working fine, the composite output is better than my 130XE, but my question is what C48 does and could running the computer with C48 damaged cause problems down the line? The Service Manual says it's an axial ceramic .1 uF capacitor. As it's next to the trim pot, is it related to the video circuitry? I will probably replace it as soon as possible it but I want to know if it's an urgent fix as I don't have any caps of that description handy! Thanks Geoff Quote Link to comment Share on other sites More sharing options...
Rybags Posted August 25, 2019 Share Posted August 25, 2019 Looks to be part of the colour adjust circuit. Maybe it's just for noise suppression and not vital. 1 Quote Link to comment Share on other sites More sharing options...
DavidMil Posted August 25, 2019 Share Posted August 25, 2019 10 hours ago, GreyHobbit said: I just recently purchased my first 800XL and was looking inside to see if any of the ICs were socketed. Most of the big ICs are, apart from the 6520 PIA, but the OS and Basic ROMs are soldered along with all of the smaller chips on the board. Anyway, while I was checking the other components, I noticed that C48 down at the front left side of the motherboard, next to the trim pot, is cracked and appears to have broken in two. There was a slight brown stain round one of the solder joints, like corrosion but it doesn't seem too bad. The 800XL appears to be working fine, the composite output is better than my 130XE, but my question is what C48 does and could running the computer with C48 damaged cause problems down the line? The Service Manual says it's an axial ceramic .1 uF capacitor. As it's next to the trim pot, is it related to the video circuitry? I will probably replace it as soon as possible it but I want to know if it's an urgent fix as I don't have any caps of that description handy! Thanks Geoff .1uF caps are the most common caps on all Atari computers. If you want to PM me with a mailing address I can send you a couple. I have hundreds of them. If not then Best Electronics has them too. David 1 Quote Link to comment Share on other sites More sharing options...
GreyHobbit Posted August 27, 2019 Author Share Posted August 27, 2019 Thanks Rybags and DavidMil for the advice. I have some equivalent caps on order and am reassured that it's not going to cause damage to the computer if I continue to use it in the meantime. Quote Link to comment Share on other sites More sharing options...
tjlazer Posted September 9, 2019 Share Posted September 9, 2019 Is C56 missing on your 800XL? Quote Link to comment Share on other sites More sharing options...
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