Motorola 17T21 Flyback & Schematic
 

Hello,
I am in need of the schematic for a Motorola 17T21/TS-418.
it is in Sams 269-9
I also need the flyback transformer cross reference as the one that is in it I suspect is bad.
Someone at a old time tv shop told me it is a Thoardarson FLY-33.
Thanks

I have Sams 269-9 here. I can scan it for you, but the fold out pages will be scanned in sections, which makes it kind of a pain to read. PM me your email if you can deal with that.

The OEM flyback number is 24K733106, which according to Sams crosses to:

Thordarison Fly-64
Merit HVO-28
Ram X106
Stancor A-8224

PM sent
My set does not have that flyback.
it has a 24K733646
Production change?

Hard to say. At any rate I just looked up 24K733646 in my Thordarson cross reference and it also crosses to Fly 64. What about your flyback makes you think it's bad? I'm in the process of scanning the Sams, should have it about an hour.

All the wax is melted off the coil and onto the phenolic board.
There is the remnants of a tube keyway stuck in the 1B3 socket.
It looks to me that someone had probably plugged it in and the filter caps shorted (one has black ooze on the bottom) as well as cracked bumblebee caps.
I can provide a picture if needed.

A picture might help. I wouldn't write if off just because of the melted wax, alone. Sometimes an old TV gets stored in a hot enough environment that the wax simply drips off without the set even being operational.

If I had a dollar for every melty or burned fly I've had or seen that still worked, I could buy a pretty snazzy TV. If your concerned you could try giving it a ring test.

People snap the locator pins off tubes a lot I never let that bother me...Unless I need to plug such a tube in.

Here are some pics of the flyback.
Looks to me like it had a literal meltdown.

That fly looks familiar....I think I have a parts chassis similar to that.

Hard to tell what was going on there. I see signs that at least some of that wax cracked and fell off. The wire winding's sure don't appear burnt.

Should I replace it?
The main primary coil is intact measures 233ohms schematic says 236.
I cannot test the other coils as the terminals are covered in the wax from the flyback.
How would i go about removing the keyway.

That fly is probably fine. It is not uncommon for them to molt their wax with age. You may need to clean the fly and coat it with sensor safe RTV silicone to prevent arcing/corona.

I can't see the top or bottom of your socket well enough to say for sure how to get the old key way out. If the bottom is open you could try to push it through, if the top is all you can access you may need to reach in and grab it with pliers, if it is trapped in a hollow you may need to remove the socket or partially dismantle the assembly to get at it.

Put a dab of super glue on the end of a wood dowel or something similar that would reach into the stub. Let it harden and then tug it out.

.

You might also be able to snag the key way by inserting something like a screw or tap thread into the center of key way(possibly drill a pilot hole), then carefully wiggle it out. Of course be careful not to jam something too big in there and destroy the socket.

I used a larger sheet metal screw. It shouldn't be hard to remove.
The Motorola flybacks were made to be disassembled and only the bad coil replaced. Try re-coating it first.