Can se/30 flyback be replaced by a 157-026C flyback?

[Sjuul010]

I bought a 157-026C flyback, not realizing it is meant for a Macintosh Plus, and thus is an older type than the one that is used in the SE/30.

I have seen the 157-0042C, which is the one that is used for the SE/30, used as a replacement flyback in a Macintosh Plus, but I'm not sure it would work the other way around. Would things go horribly wrong if I use the 157-026C in my SE/30 anyway?

 

[AvadonDragon]

It SHOULD work just fine. The older part could be lacking the bleeder resistor. I don't recall which models included it. Everyone should discharge before working on a CRT anyway. Given the scarcity and cost of flybacks these days using less than ideal parts will probably become the norm.

 

[Sjuul010]

Yes, I figured this one lacks the bleeding resistor. But like you said, better something than nothing.

 

[JDW]

Wow. Those little guys have gotten nightmarishly expensive:

157-026C Flyback 157026C / Replaces Apple / HR 42031 | eBay

All credit cards are processed with Authorize.net. © 1982-2015 Dalbani. Serving the Electronic Industry Since 1982. Miami, FL 33166. 4225 NW 72nd Ave. Dalbani is a national and international distributor of high quality electronic components and parts.

www.ebay.com

$150

 

[Kai Robinson]

Just a word of warning - I purchased a flyback from Dalbani a few years ago - while it looked new, all the internal windings were melted/shorted together. I never got a refund either.

 

[Sjuul010]

Wow. Those little guys have gotten nightmarishly expensive:

Yes! I hope it will be worth it.

 

[Sjuul010]

Just a word of warning - I purchased a flyback from Dalbani a few years ago - while it looked new, all the internal windings were melted/shorted together. I never got a refund either.

I'm sorry to hear that. Did it damage the machine you installed it in?

Makes me a bit hesitant to swap the thing in right now, since my original one is not completely dead yet.

 

[Kai Robinson]

I never installed it because I checked the winding first.

 

[Sjuul010]

I never installed it because I checked the winding first.

Aha. Could you tell me how you did that? I tried using my multimeter to see if all the pins were shorted. I found some were connected one or more others, but I don't know which one should be connected, so I'm not sure what to make of that.

 

[Paolo B]

At page 94 and 95 of Larry Pina’s book “Macintosh Repair and Update Secrets” you will find an overview of the flyback transformer part numbers.
157-026C was originally supplied for Mac Plus. From Mac Plus on, all OEM flyback transformers should have the bleeding resistor, but it is always mandatory to discharge the CRT before proceeding further.
As far as my experience goes, all units designed for monocrome compact Mac’s will do the job.