I have a friend with an admirable ethos of old-fashioned thrift; she buys high quality items and tries to extract maximum useful service life out of them. The other day she brought me an Alpine CDA-7837 CD head unit from her car (the car itself has something like 300,000 miles and is beautifully maintained). CDs apparently load but immediately eject without playing.
I opened the case and put power to the unit. The loader is mechanically fine. Discs load, are clamped, and spin up to what looks like correct RPM. The laser does *not* illuminate, unless I am missing it lighting up after the disc has covered it. I can see a bit under the edge of the spinning disc, and there is no spillage of red light present underneath, as I would assume would be normal.
Checked with pacparts about the laser. They have a new pickup for a very reasonable $25. I'm certainly willing to put in the half hour it would take to install that for my friend. But I am unsure of the next step. Posts here about other CD units have implied that on those, after the new pickup goes in, it must be realigned with a scope and a test disc.
I have a scope. But the time/hassle to obtain a test disc, figure out its use, rig the scope and do the procedure would put this over the top to where I'd just suggest she buy a new player, thriftiness notwithstanding.
Conversationally, a technician had told me last year that many modern CD units no longer require a "realignment" per se. The servo and tracking mechanisms are capable enough to run well after simply popping in a new pickup, he said. His outfit are apparently still pleased to bill for "realign" jobs, but that usually just translates to cleaning the optics and turning up the bias current a bit.
Not sure how much credence to attach to that. Not sure if this Alpine (build date 8/98) is new enough to be self-reconfiguring after a pickup change.
Suggestions or warnings would be gratefully acknowledged!
Chris T