Here's something you don't get to see every day ... motor swap for an old CD-ROM drive. More about that in a second, but first let me give you a heads down.
I got couple of BTC BCD 24XH drives which didn't seem to work, or detect any media whatsoever. Whenever it's an audio CD or data one - doesn't make any difference. So long story short, I came across this 50X Acer unit which seems to share the same, Philips loader as BTC and I was hoping to do a clean swap. Old assembly out & new one in, end of story!
Unfortunately, things did not go according to plan ... do they ever? Acer (being a newer, faster model) has updated mechanism with newer firmware AND mechanical revision. Gear reduction for the servo mechanism has been changed to allow faster seek times, and there has been changes in wiring diagram, as servo motor & laser pickup now both have their separate connectors - where the older BTC does not, they share a single ribbon connector making them mutually incompatible.
Of course, I didn't ... and couldn't allow something like that to get in the way, so I started thinking... With a bit of drilling, hacking, grinding & fabricating new mounts, I could easily transfer JUST the motor alone, since the motor was the only thing I needed, in the first place. And so there you have it, one "Acer" motor mounted on "BTC" frame chassis
To be honest, mounting holes for this particular motor already existed before, but they hadn't been used on BTC, so it was mainly just a matter of hacking out the excess plastic & mounting the motor on the existing mounts.
Long story short, it didn't work ... unfortunately
Yes, the CD drive DOES appear to be working, and it even plays audio CDs just fine. Therefore I've already made a huge deal of progress because it was completely dead before, I couldn't read any discs. Data CDs on the other hand does not appear to be working ... it gets recognized and the unit spins it up but then gets confused & after several attempts to read the content gives up. Now sure what is going on, but I'm guessing this is due to RPM difference between the two motors. The old one was much slower (for 24X drive) where the new, replacement one is 50X and spins at noticeably faster RPM. If only I could limit the damn thing, prevent it from speeding up & allow the BTC firmware to actually read/access the content in time - would something like that even be possible?! Either way, I call this somewhat successful! No, it's not perfect, and it didn't work according to plan, but the unit is still more operational than it was before!
And so there you have it, BTC playing audio CD... You can even see that "invisible laser radiation" beam, looks pretty decent IMHO
Oh, and for those of you who are curious, this is actually Philips loader/mech, model number is ROL 1318/2. It was a somewhat common mechanism back in a day, used on many different drives including Philips, itself:
The easiest way to recognize these is by big, round LED and tray door flap, which folds down and reveals the actual tray inside. Rather than door flap/trip being a single piece and sliding out together.