User:Akbkuku/projects

Current Projects
{| class="wikitable" !Device !Next Step !Notes
 * +Projects and Stages
 * Super Nintendo
 * Replacements
 * Sony TC-188SD
 * General
 * Tape player that needs belts found
 * IBM PS2
 * Order
 * Olivetti M24 and ATT 6300
 * Replacements
 * IBM PS2
 * Order
 * Olivetti M24 and ATT 6300
 * Replacements
 * 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 do not seem to have series markings
 * Caps do not seem to have series markings

Caps will likely not fix the issue I am having but I'm going to get them anyway
 * Toshiba T1600‎
 * Order
 * Atari SC1224
 * Order
 * 27-3V07 PSU
 * Replacements
 * Double check cap brands and series (get photos)
 * 27-3V07 PSU
 * Replacements
 * Double check cap brands and series (get photos)
 * Replacements
 * Double check cap brands and series (get photos)

Corrected mis-identified panasonic caps and determinued they were all SU series.
 * IBM 5150
 * Replacements
 * Caps do not appear to have series markings but do have two forms of date code markings
 * Abit BP6
 * Order
 * 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
 * Order
 * Check cap series again to fix axial cap
 * Ultra XConnect Modular PSU‎
 * Order
 * Check misread cap value
 * }
 * Check cap series again to fix axial cap
 * Ultra XConnect Modular PSU‎
 * Order
 * Check misread cap value
 * }
 * }

Long Term Projects

 * Data Generals
 * S-100 Systems

Completed Projects

 * Mac Classic II‎
 * SP9808 PSU‎
 * Voodoo 5‎
 * IBM 5153 CGA Display