[Techtoolslist] Recommend add a fuse upgrade for Fluke 9100 series

[Dave Riddle (Technical Dept.)]

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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