Thread
Flyback transformers - options for replacements
Hi I have a 512K that has a slight display jitter when the floppy drive is accessed and after being on for about an hour will start a nearly inaudible high pitched whine.
According to Larry Pina, these symptoms are of a failing flyback transformer.
What options do I have for seeking replacements for this? I assume that they cannot be purchased as new parts? I am worried if the only option is to transplant them from other machines that ultimately they will all fail.
Any advice?
According to Larry Pina, these symptoms are of a failing flyback transformer.
What options do I have for seeking replacements for this? I assume that they cannot be purchased as new parts? I am worried if the only option is to transplant them from other machines that ultimately they will all fail.
Any advice?
http://www.ebay.com/itm/157-0026B-Flyback-1570026B-Replaces-Apple-HR-42031-/400566688902?pt=LH_DefaultDomain_0&hash=item5d43a29c86
make sure to change all the big electrolytics. , and AC filter cap too.
and your issues should be solved, maybe refresh the joints as stated in DMS.
make sure to change all the big electrolytics. , and AC filter cap too.
and your issues should be solved, maybe refresh the joints as stated in DMS.
Yep, Ive been stocking up on these, once they're gone, they're gone...
When you refresh the solder joints, do not just heat them. Desolder the joint and remove as much of the solder as possible and then resolder with fresh solder for a clean joint. Just reheating the joint will cause the solder to muck up and start cracking.
well as stated in DMS, it says to use vacuum desoldering.
Thanks very much for the link and advice guys!
which models do that part work for?
all.
aye, well thats good to know thanks!!
well i should specify what i mean by all. 
128k 512k Plus.
Will also work in the SE and SE/30, The Classic and Classic II have a different flyback.
128k 512k Plus.
Will also work in the SE and SE/30, The Classic and Classic II have a different flyback.
AH! Even better!
"Will also work in the SE and SE/30" does that mean that it isn't the exact part but can be fitted to work in these models?
"Will also work in the SE and SE/30" does that mean that it isn't the exact part but can be fitted to work in these models?
Yes it will work.
Also the cracked joints on the A/B sometimes the connections get really bad, especially when people keep hitting their compact with the soul of a shoe and keep running it.
The Joints not only crack but they carbon up and fry as well.
So not only use vacuum desoldering, but scrub the pin with wick and flux to clean it. Before Soldering it back up with
fresh 60/40.
You could also desolder the whole header, and use a dremel (stone or wire wheel) if you want to be extra thorough.
Also the cracked joints on the A/B sometimes the connections get really bad, especially when people keep hitting their compact with the soul of a shoe and keep running it.
The Joints not only crack but they carbon up and fry as well.
So not only use vacuum desoldering, but scrub the pin with wick and flux to clean it. Before Soldering it back up with
fresh 60/40.
You could also desolder the whole header, and use a dremel (stone or wire wheel) if you want to be extra thorough.
looks like ARTMIX sells one as well.
but shipping is much more.
http://www.ebay.com/itm/Mac-128K-512K-Plus-SE-SE-30-Flyback-Transformer-New-Condition-/301556148137?pt=LH_DefaultDomain_0&hash=item463625a7a9
but shipping is much more.
http://www.ebay.com/itm/Mac-128K-512K-Plus-SE-SE-30-Flyback-Transformer-New-Condition-/301556148137?pt=LH_DefaultDomain_0&hash=item463625a7a9
yeah and it *looks* like artmix has only 1...?
Also check out this other thread:
https://68kmla.org/forums/index.php?/topic/21632-macintosh-plus-boot-problem-maybe-a-cracked-solder/page-4
https://68kmla.org/forums/index.php?/topic/21632-macintosh-plus-boot-problem-maybe-a-cracked-solder/page-4
I just thought, will it matter that I have a 240V (Australian) analogue board, it shouldn't matter for the flyback?
Yup the flyback is the same.
I'm wondering how much the Apple Techstep Diagnostic tool can help with these problems.. I got a techstep not too long ago, but havent had time to really play with it..Uni, do you happen to know if it can help diagnosis a/b problems?? I know it can analyze power supply voltages but....
Really to be honest when an A/B comes in.. I don't even diagnose it.
I just get right on into it... Clean, Do the caps, suck out all the cracked joints, then test. and from there, it either works fine or it does not, if not, from this point i can make a good estimate as to what its going to still need to work properly as far as time/costs.
As i said in this thread:
https://68kmla.org/forums/index.php?/topic/21632-macintosh-plus-boot-problem-maybe-a-cracked-solder/page-4
I just get right on into it... Clean, Do the caps, suck out all the cracked joints, then test. and from there, it either works fine or it does not, if not, from this point i can make a good estimate as to what its going to still need to work properly as far as time/costs.
As i said in this thread:
https://68kmla.org/forums/index.php?/topic/21632-macintosh-plus-boot-problem-maybe-a-cracked-solder/page-4
I did end up making a few of these up. after a couple revisions i realized that epoxy works out much better 
Very neat!I did end up making a few of these up. after a couple revisions i realized that epoxy works out much better
Screen Shot 2015-03-09 at 5.19.23 PM.png
Well, except it looks like Artmix's offerings are new production. At least, I've never seen one that looks like that until his came on the market. So I suspect that once they're gone, we'll still be able to buy them from Artmix, but at a higher price.
All that said, I stocked up a couple of years ago, when Dalbani was asking less than $10 each for them.
My advice is to vacuum-seal silica pack the unused flybacks, you need to keep the moisture out of the windings if they are going to last over the years. We are having a big big problem with this in the tube-type TV collecting world.
oh yeah i see... ARTMIX's Flyback solution is a re-worked new flyback, to where many of these others are NOS, new old stock, kinda thing.