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[Console Repair/Mod Center / Re: CDROM2 audio glitching and alternative laser request]

Is it a really really fast rhythmic sound almost like the sound is sputtering rapid fire like? Or does it almost sound like a scraping sound coming out of the speakers?

I guess it's the first kind: A brief peak that's repeated.
Do you have an idea about what would be causing it?

[Console Repair/Mod Center / CDROM2 audio glitching and alternative laser request]

Hello,
I have a white CDROM2 that seems to work OK, except for a small problem:
When playing the outer tracks from an audio CD, there's a glitch that can be heard and that seems to repeat rhythmically, it does seem to be in sync with the rotation of the disk...
Is this something that can be corrected with the pots? Or is it a mechanical problem? Or maybe the laser is dying?

Also I'd like to replace, or at least acquire a spare part for my laser; I can buy a KSS-225A but I don't know if it does work in the white CDROM2.
Can  someone confirm that the -225A is a fitting replacement for the -220A?
Does it need some tweaks/adjustments for the ribbon or is it an exact drop-in replacement?
Thanks!