Well this is superb.
There is no real need for high res as the resolution is good enough, but... a flatbed scanner
would straighten it out, orientation and angles can always be fixed afterwards.
So if you just would scan it someday I could clean them up realigned them and make a nice PDF for you, it would probably take about 10-15 effective hours, but it would be so worth it, and it would never have to be done again...
http://www.retrosampling.se/Temp/TG16%20Service%20Manual%20Example%20(Before).tifhttp://www.retrosampling.se/Temp/TG16%20Service%20Manual%20Example.tifThat's how it could look minus the unevenness..
The test jig sounds particularly fun, all mass produced electronics have a test jig,
but it's usually a pull down design with pins connecting to different solder points on the SEC side.
and there's usually two also, one for the PCB makers so that the PCB is ok from the start
as the PCB is the most important component, you can change everything else afterwards
but if that's not ok from the start then it goes to the discard bin,
and then once it's mounted and soldered it's put in the main test jig.
But this seems to be a service jig, which also mean they existed in the states, the others would never left japan (manufacturer origin), and it's EXT based... I always suspected a test huey like the one for Atari Lynx (Diagnostic Cartridge), but that only tested colours and buttons, and this is totally automatic as it send the controller functions back with that controller endplug.
The first two jigs keeps laying around for a year or two after a product ends but then gets rebuilt with moved pins for other products, but a service jig has no other purpose, there might still be one out there, in the states...