electronics debugging 

finally something nice and solid to work on, i'm happy to not see that 2000s plastics everywhere for once

electronics debugging 

how is almost every single capacitor i measure in this thing bad

i found one good one so far 😑

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electronics debugging 

fixed it! sort of, it reads cds again, but kinda sluggish.
now running on a unholy mix of recycled chinese, east german and one soviet capacitor.
one day the audiophiles are going to hunt me down with pitchforks. 😅

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electronics debugging 

guess the sluggish thing was just the mechanics getting used to moving again after 20+ years. works perfect now without doing anything else. replaced all but one capacitor on the drive mechanism pcb (one was ok), all way out of spec (the 68µF in the laser focus circuit was measuring as 12µF, etc.).

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electronics debugging 

shoutout to the person that wrote the firmware for this thing back in 1981 and decided that the super slow movement of the laser mechanism should at least be accompanied by a nice led animation, i love it

electronics debugging 

and yes, that mechanism is loud as fuck, that noise is the laser focusing

cd mechanisms have come a long way since then

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electronics trivia 

fun fact about early cd players: in the early 80s there was a pending lawsuit in the usa that alleged the laser beam would pass through the case and give you cancer or whatever, since it was pointing upwards. some manufacturers panicked, fearing recalls, and switched production to an inverted mechanism: the laser was now pointing downwards, you had to insert the cd in the tray label down, shiny side up. when the lawsuit lost, production switched back to normal.

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electronics trivia 

as hardly anyone knows about this and there aren't that many affected models, there was a wonderful time when you could buy really cheap high-end cd players on ebay listed as "not working", insert the cd label down, and have a working cd player.
i think by now they have mostly been trashed (because "broken") or people know about them, i haven't seen one in years

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