XEGS capacitor question

[atari-dna]

Can someone confirm the value and type of capacitor located at C26 on theAtari XEGS? In the photo, mine is missing. I'd like to get this repair done, and want to get the correct part. Google searching for schematics, no luck on my end. Help is greatly appreciated.

Additionally, my Sally 6502C is toasted, I find Best has replacements at $8. If anyone has stock at or near that price point I am interested.

[Kyle22]

.1 uF decoupling cap.

 

EDIT: Attached schematic. Look at the first pic in the zip file.

 

xesys.zip

Edited April 7, 2015 by Kyle22

[atari-dna]

Much appreciated! I've cleared out the CPU and capacitor slots, ordering product today. Will post again once the install is complete.

[atari-dna]

These schematics are very helpful, thank you. I rendered them as PDF files (using a Mac on my end) and wanted to re-post them for others to access if the PCX format was proving difficult

XEGS System Schematics.pdf

[Marius]

Much appreciated! I've cleared out the CPU and capacitor slots, ordering product today. Will post again once the install is complete.

 

That is a very nice desolder job you did there atari-dna!

I'd use a precision socket now, in stead of soldering in a new 6502. Are you sure it's only a defect 6502 btw?

 

Amazing machines those XEGS. I have a few NIB PAL, and the video output out of the box is excellent.

[atari-dna]

Thanks for the compliment, ProWizard. My soldering has come a long way. I intend to install a dual-wipe socket to the board and then install a new 6502C.

I've already replaced the RAM (socketed) and the Sally was the only chip getting hot, I figure it's the root of my problem. I'll post results when the parts come in and I get a chance to fire up the XE once more. This picture is the video I currently get (scrambled, jagged yellow lines) which I hope clears up once Sally gets switched.

Sally (the old chip) was getting hot to the touch and I presume it's shorted internally. No other chips are warm and no other signs of damage to the board...I am planning on purchasing a logic probe at some point, but I don't have any other sophisticated diagnostic tools other than my fingertips (heat sensors) and soldering iron at present...

[gozar]

Thanks for the compliment, ProWizard. My soldering has come a long way. I intend to install a dual-wipe socket to the board and then install a new 6502C.

I've already replaced the RAM (socketed) and the Sally was the only chip getting hot, I figure it's the root of my problem. I'll post results when the parts come in and I get a chance to fire up the XE once more. This picture is the video I currently get (scrambled, jagged yellow lines) which I hope clears up once Sally gets switched.

Sally (the old chip) was getting hot to the touch and I presume it's shorted internally. No other chips are warm and no other signs of damage to the board...I am planning on purchasing a logic probe at some point, but I don't have any other sophisticated diagnostic tools other than my fingertips (heat sensors) and soldering iron at present...

 

Looks like RF but on the wrong channel. But you're using the AV connection, aren't you?

[atari-dna]

I'm using RF, actually. The other channel was a screen filled with a dark rusty/orange color-- no video. Any more advice? Ordering a Sally this weekend. I'll post results when the chip and capacitor arrive.

[Kyle22]

The channel with the dark orange picture is the correct one. After you replace Sally, the screen should become normal. It is orange because the GTIA isn't being initialized by the CPU.

[atari-dna]

Parts arrived, got a brand new ceramic decoupling cap @C26, and a new dual wipe 40 pin dip socket freshly installed, just need to plug a new Sally in and fire it up for the moment of truth. Fingers crossed😄

[atari-dna]

Success!😀 my XE is back from the dead!

 

[Caterpiggle]

Congratulation to atari-dna !

 

Your XEGS come back to alive again !

 

My currently XEGS has dead video display with "snowing" white effect on the screen ! In 1 day, I will take a photo on my XEGS here and guide me how to fix or repair. Thank you for read out. So is possible to repair mine based on "snowing" white screen ?