My first attempt at speaker repair, need help!

[ageis1]

Hi AK,

I'm trying to learn a little bit more about speakers and how to repair them, so as a first project I've picked up some Technics SB-K22's that need some love. I'm sure these speakers aren't really worth fixing, but just doing this as a learning exercise. Before we get in, I am an audio lover, but know very little about repair. Some of my terminology is probably off, so apologies. Anyway, onto the issue!

On one of the speakers, the tweeter and mid driver don't work. I tried putting these suspected faulty drivers in the other speaker that does work, and the they worked perfectly fine when in the other cabinet. From my novice research, these would seem to mean that the problem is with the crossover? When I take a look at what's inside of the box, I don't actually see what I expected to find in a 'crossover'. There is the three wires that attach to the back of the plate where the speaker wires feed into, and there is also a small circuit on the inside of the box which appears to be an 'overload indicator'. Anyway, what do you guys think I should be checking next? I have attached pictures to illustrate my comments. I'm sure that this information has been covered many times over here on the forum, but I can't locate it by searching. I'm just a newbie looking to learn more about vintage audio, so would love anyone's comments or thought

Thanks!

 

[70's Rockfan]

have you tried resetting the overload.
there is a button you have to push in.

 

[TudorTurtle]

I see a coil in the picture, that's an inductor that filters out the high frequencies, so typically wired in series to the woofer. There's a blue cylindrical component at the top, that's a 4.7 uf capacitor, probably wired to the tweeter, it filters out the low frequencies.

Do you have a multimeter? You can use it to check the continuity of the wiring connections. Especially the circuit to the tweeter and mid. Easily be a bad solder or maybe a bad capacitor.

Drawing out the wiring diagram will help you a lot.