@Allgaeuer - seeing you are doing a complete LD player list, have it crossed your mind about making a complete LD player parts list for comparison and to check whether parts can be salvaged from players to be re-used in other models? Something like Pioneer's own parts detail list, but for example create a sticky thread and chronologically list the VEB-part numbers and behind in parentes list the models using this specific part.
For all we know, Pioneers cross-reference schematics won't be there forever when all the new parts are gone.
I haven't any specific parts in my mind at the moment, but let us say part numbers for cogs, springs, etc. - mechanical parts that are the same size and worth the effort of keeping instead of dumping.
It is both eco-friendly and better use of parts that may have many years left on their back.

I know this is a huge task and not something one would do just for fun, but I think in the end that would have been something of effort to those who fix their own equipment and the forum would have been an even more complete database. I'm sure there are many here that would contribute to it and share knowledge!

In a Panasonic manual I saw that Panasonic distinguishes between e.g. a model LX-600U and LX-600CA, but to me it looks as if the only difference is that the one with the U is the model intended for the USA, and the one with CA is the model intended for Canada - I could not find any physical difference between these two models ...

The mains voltage is 120V/60Hz in both countries, and also the mains plugs are the same, so where is the difference?
Does somebody know what is the difference between these two models?

This could also add an additional "hardware" section to include MUSE decoders, AC3RF demodulators and Pioneer part numbers.

=> So not a "Player Database" but a "Hardware Dabatase" to complete the current one that is, in reality, a "Software Database"

Found a section of a website with ALL Pioneer Electronics parts numbers (more than 370,000!), catalog descriptions and most recent prices in USD (either sold out or not). Will retrieve them all to later filter the ones directly related to LaserDisc players.

About the only parts that can be swapped between players are the mechanical assemblies, even the LD-S9 and HLD-X9 use the same mechanical assembly as in the CLD-99/704/etc. All the electrical boards have some type of difference, differences are as little as the same boards where the IC's are programmed differently all the way to completely different component layouts. Older units CLD-D702 and older had common mechanical parts.

When I get parts units I keep a few parts and throw the rest away

On the surface, you might think the CLD-D703 and CLD-D704 are essentially the same player, with the exception of the addition of AC-3 on the AUDB board. However, if you take the front panel board from a D703 and try to use it in a CLD-D704 (which I did because of a broken board in the 704), the player plays great - as long as the disc is encoded with TOC. If there is no TOC, the player will just sit there spinning the disc forever. If you take the 56 pin IC out of the 704 board and put it in the 703 board, full functionality is restored.

1. First of all, I downloaded ALL (about 370,000+) Pioneer part references from ued.net.

Ex: https://www.ued.net/ued/viewItemAction.do?itemCode=PNRVNL1371 or https://www.ued.net/ued/viewItemAction.do?itemCode=PNRVEB1149

Of course I'll have to either remove the ones not related to LD Players (DVD, BD, car audio, speakers, A/V amps, etc.) or validate that they are indeed LD-related using the Service Manuals available today.

Next code to write: multiple selection of devices (to assign one looked-up part # to several devices, ex: VNL1700).