If I remember correctly, some 5.25 inch floppy drives get power from the floppy cable only - my uncle's Packard Bell had one of these. The floppy cable itself looked peculiar, a standard 34 pin connector with an extra 10 pin right next to it. Finding one of these cables will probably be difficult (haven't seen one since the late 90's).

Your Teac drive is indeed missing the 4 pin molex. Here are pics of mine to compare with:

You look to have the vias and pads for the Molex though, so you could solder one on.

Does it not have the Teac model information sticker on it? 😒

Yup but I didn't pull up anything useful by google-ing the model.

From the look of that ragged black plastic item with the 5 metal prongs,
looks as if a connection, maybe with a flat ribbon cable, was ripped out.
Well, no big problem - probe the prongs to see if there is 0 ohm continuity
with certain of the empty holes where the normal power connection should
sit, probably there will be, so source a normal connection from an unsalvage-
able other floppy, and solder that in.
A 7193 being the most desireable of the 5.25" floppy drives, even if you decide
not to keep it, if it is in operable condition, then someone else will buy it... 😀

Uh... what black plastic thing would you be talking about because there simply isn't one. The thing that looks like a black plastic thing is really some solder points in the foreground with light shining through the case in the back. 🤣

It's pretty apparent there never was a molex connector on here.

just add a molex connector.. quick search online says they cost less then $2

Yeah I'm going to, nice picture btw. I just scored two of those, waiting for the PSU to get here so I can test them. Love the way they look though.

OP said;"It's pretty apparent there never was a molex connector on here."
Mmmm, and where did I say it ever had a molex connector?
"what black plastic thing would you be talking about because there simply isn't one."
This is the object (black plastic item with the 5 metal prongs) I was referring to;

The action I suggested was;
"probe the prongs to see if there is 0 ohm continuity with certain of
of the empty holes where the normal power connection should sit"
A finding of continuity would tend to suggest that those prongs are associated with
the power lines of the floppy circuit board - and given their exposed position at the
back of the 5¼ floppy drv, could possibly have had something attached to them to
provide power to the floppy.
Anyway, don't worry about it.

(N.B. JayCeeBee64 , some models of Tandy computer systems fed the 3½ floppy drives
power (they used) through the 'data' cable, but I don't think any of those particular systems
powered the 5¼ floppy drives they used in any way other than through a power connector
separate from the data cable.)

What you are seeing is the base of the connector for the read write heads ribbons.

buyerninety wrote:

(N.B. JayCeeBee64 , some models of Tandy computer systems fed the 3½ floppy drives they used through the 'data' cable, but I do […]
Show full quote

(N.B. JayCeeBee64 , some models of Tandy computer systems fed the 3½ floppy drives
they used through the 'data' cable, but I don't think any of those particular systems
powered the 5¼ floppy drives they used in any way other than through a power connector
separate from the data cable.)

I know that the 1000 series that could fit a 5.25" drive always had a Molex connector just for that or a hard disk drive. It looks like there were weirder PC OEMs out there.

"What you are seeing is the base of the connector for the read write heads ribbons."
Well, you're right of course, and I'm embarassed - NOW I recall
seeing almost the same 'cracking' looking damage on the back of
another normal 5¼ drive...
Hey, here's a possibility to consider - I saw this pinout for a 3½
HewleTT Packard floppy drive and wondered if any of their
5¼ floppy drives used the same arrangement on their finger
contacts. (If that is a HP pinout then a test with a digital
multimeter should show no zero Ohm continuity between
the groups of 5V, 12V and GND contacts, but of course continuity
would exist 'within' the 5V group, within the 12V group, etc.).
http://www.retrotechnology.com/herbs_stuff/drive.html#35new
Something to test on your TEAC FD-55GFR 7193-U TT drive...