6

A loud click at beginning/end of the sound, but faint sound inbetween might be caused by a failed DC blocking capacitor. According to the gameboy schematics found at http://www.devrs.com/gb/files/gameboy1.gif, there is a 100µF capacitor in series with the speaker. If this is indeed the case, sound should be working fine at the headphone jack, because it uses ...


3

The keyboard pictured is an AT&T KBD301, which uses Olivetti dome with slider key switches. This keyboard was recently covered in a YouTube video by Chyrosran22. These are going to be difficult to source as its not a common switch and key caps from other switch types aren't compatible. Other confirmed sources for compatible key caps are as follows: ...


3

There can be no one size fits all recommendation for all vintage computers. For example some DEC power supplies incorporate an over voltage circuit that short-circuited the output of the power supply. If you attempted to apply power with the power supply disconnected from the computer this circuit would trigger. If you made major changes to the internal ...


3

My advice for the first start: Let the computer slowly warm up to room temperature. Perform a careful "audio test" - I mean tilt the case or slightly shake and hear. If some strange noise appears, it would be better to open it and find a part making the noise. It could be a piece of plastic or something torn off - a wire or some other part. Check all ...


1

Check this out: http://www.vcfed.org/forum/showthread.php?43547-How-to-make-an-head-cleaning-kit-for-5-25-quot-floppy-drive-(my-way) This guy tells you exactly how to make your own cleaning floppy disk drive.


1

You need a contact cleaner. Wikipedia does mention isopropyl alcohol as being one, but I've found that the industrial products designed specifically for contact cleaning do a much better job. I currently use Kure Contact Spray; a quick spraw of it causes oxidation to visibly vanish. This exact product doesn't appear to be available outside Japan, but the ...


1

The "overheating" smell might emerge from the dust accreted on the heating components, if the device was off for a long time. So you could try to clean the dust off the PCB and components to get rid of the smell.


1

Commodore 128D has an internal PSU so you don't have the risk to have a faulty external PSU, typical for older C64 and C128. Se this other answer: What is the proper way to test the PSU output for a Commodore 128D? Commodore motherboard doesn't have an RTC battery and doesn't use tantalum capacitors so you don't have some problems that plaugue Amiga and ...


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