My neighbor (and client) is Heritage Transformer in Eastview, KY. Small enough to care and large enough to be capable! https://www.manta.com/c/mmsh8lv/heritage-transformer-co-inc On 8/14/2018 8:59 PM, John Robertson wrote:
I am now on the hunt for the small switching transformer on one of my 9100s as the original was cooked. Unfortunately it was not fused by Fluke and I am not sure where I am going to find this sucker. It is T1 and is called Transformer, Converter 775932 (manufacturers #89536) in parts listing.
Shy (@ Navatek) hasn't seen one before but is still checking...
This is a multi-winding sucker and provides the isolated voltages for the serial ports as well as the 70V for the display. Years ago I had a secondary cap (C101) short on this transformer and it let the magic smoke out. I had set it aside and forgotten, but now I am restoring a few 9100s and dug this out and found the smoked Xformer.
In the meantime I have modified all my 9100s lifting the furthest leg of inductor L2 (10uH) away from the power connector J15 and then add a GMA fuse holder in series from raised leg and the PCB. I find a 300ma fuse works just fine. Which is interesting as Fluke put a 1A fuse in the 70V output to the display...obviously overkill!
ftp://ttl.arcadetech.org//home/mirrors/flippers/TTL/Test_Equipment/Fluke/9100%20Series/Photos/Fuse_your_Converter_transformer/Fluke_transformer_converter_Add_Fuse_300MA.JPG
I may have to send this transformer core out to get rewound, anyone have a suggestion where? Or I may try my hand in it, I have lots of tiny magnet wire on hand - assuming I can't find the transformer.
More photos:
ftp://ttl.arcadetech.org//home/mirrors/flippers/TTL/Test_Equipment/Fluke/9100%20Series/Photos/Fuse_your_Converter_transformer/
John :-#)#
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