This Teac is a 10.5" reel to reel
That was a high end machine, that included dbx noise reduction.
Setting up reel to reel machines is an art. I used to use them professionally and did my own maintenance and repair. However, I used Revox machines apart from one bespoke Brennel Mark VI. I avoided Far Eastern machines, because of the difficulties of repair and maintenance.
For reel to reel machines, you need to be a parts hoarder, as most crucial parts are NLA.
I did research that machine, and it is not modular, although there are some discrete boards. like the dbx board and the logic board is separate from the preamp board.
Can you tell me if the machine, will pass an input signal, to the direct out, with the tape monitor loop disengaged. If the answer is yes, then at least half or more of PCB 115 is working. If you can not pass a signal though the machine, then you almost certainly need to find a working 115 preamp board. The board would not be easily fixable, if at all.
I find these boards come up rarely and get snapped up right away, so that gives me a clue.
Vintage audio of Milwaukee WI does work on vintage reel to reel machines. Most reel to reel enthusiasts do their own repair, but you need scopes, signal generators, frequency counters and a distortion analyses, as well as lab certified alignment tapes. I do have all that, but honestly I don't have the stomach to work on a Far eastern machine. Compared to the Studer/Revox machines, the Far Eastern efforts are an absolute nightmare.
I should caution you that reel to reel service is very expensive, as you end up with hours into a machine.
If it is tapes you want to play, then you would be better off looking for a Revox machine on eBay. They were in most recording studios and every radio station I ever visited. So there are still lots of working machines, and you can usually scrounge a part on eBay.
If the preamp board is not functional then I would seriously consider looking for a machine with a better pedigree.
