User:Akbkuku: Difference between revisions

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|[[Olivetti M24 and ATT 6300]]
|[[Olivetti M24 and ATT 6300]]
|Replacements
|Replacements
|=== Investigation Round 1: ===
|
=== Investigation Round 1 ===
I don't specifically need caps for this, parts were knocked loose but the video card may be bad.
I don't specifically need caps for this, parts were knocked loose but the video card may be bad.


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Power supply had broken solder joints in it on molex power connector and a large transformer.
Power supply had broken solder joints in it on molex power connector and a large transformer.


=== Investigation Round 2: ===
=== Investigation Round 2 ===
Video card is not outputting sync signals. CRTC chip is but signal gets held up in SN74S374 . Chip may be bad. Output filter disconnected as part of troubleshooting.  
Video card is not outputting sync signals. CRTC chip is but signal gets held up in SN74S374 . Chip may be bad. Output filter disconnected as part of troubleshooting.  


Revision as of 13:59, 24 February 2022

aka: Shelby

About

I am someone tired of not having a good text medium to share repair information. So I decided to start Caps Wiki as a solution to this problem. A central location where information about repairing devices can be cataloged and easily referenced by anyone.

Owner of content from the Youtube channel Tech Tangents

Current Projects Here

Projects and Stages
Device Next Step Notes
Sony TC-188SD General Tape player that needs belts found
IBM PS2 Order
Olivetti M24 and ATT 6300 Replacements

Investigation Round 1

I don't specifically need caps for this, parts were knocked loose but the video card may be bad.


Power supply had broken solder joints in it on molex power connector and a large transformer.

Investigation Round 2

Video card is not outputting sync signals. CRTC chip is but signal gets held up in SN74S374 . Chip may be bad. Output filter disconnected as part of troubleshooting.


Initially the computer would not turn on, after seemingly changing nothing it came back. There may be more bad solder joints in the PSU. There was no significant ripple on the voltage rails.


Video card can be disabled by pulling another chip and jumpering some of its pad, but the chip is not socketed. If the BIOS was a newer revision it may be possible to disable the video with motherboard jumpers. Then a CGA, MDA, EGA card could be put in for further evaluation of the rest of the system in the short term.


Requirements for further investigation:

  • sn74S374n 20 pin DIP(Need to confirm that chip from schematic)
  • 20 pin socket - socket 11C
  • 14 pin socket - socket 3G/the video disable option
  • ROMs that can be burned to upgrade to a newer BIOS revision
Commodore VIC-20‎ Replacements Caps will likely not fix the issue I am having but I'm going to get them anyway
Toshiba T1600‎ Order
Atari SC1224 Replacements
27-3V07 PSU Replacements Double check cap brands and series (get photos)
IBM 5150 Replacements
Abit BP6 Replacements I should document the recommended alternate sized caps from bp6.com in addition to the exact replacements
Roland MC-303 Order
Media Vision Pro AudioSpectrum‎ Replacements Check cap series again to fix axial cap
Ultra XConnect Modular PSU‎ Order Check misread cap value

Completed Projects Here

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