Recommend add a fuse upgrade for Fluke 9100 series
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 :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
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 :-#)#
-- Find us at http://home.windstream.net/enginr
John Robertson writes:
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.
89536 is the manufacturer code for Fluke. Many parts in the 9100A service manual are listed this way, even if Fluke wasn’t the actual manufacturer.
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!
The fuse on the 70V line is supposed to be .125A, not 1A. Maybe the original popped and someone put the 1A part in, and that’s why your transformer is wrecked. -- Ian
On 2018/08/19 10:29 PM, Ian Eure wrote:
John Robertson writes:
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.
89536 is the manufacturer code for Fluke. Many parts in the 9100A service manual are listed this way, even if Fluke wasn’t the actual manufacturer.
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!
The fuse on the 70V line is supposed to be .125A, not 1A. Maybe the original popped and someone put the 1A part in, and that’s why your transformer is wrecked.
-- Ian
It wasn't a 70VDC line issue, rather tantalum capacitor C101 shorted out, taking the Xformer as that cap was on the -12VDC output...hence my recommendation to add a 300MA fuse to the Xformer input at L2. Tantalums have a bad habit of shorting... Check schematics in Service manual, page 7-5 9100A-1001 (3 of 4), there are several that would take the Xformer if/when they short out. Thanks for the reminder about the 0.125A fuse for the display, I should have noticed that as it is clearly labeled on the schematic. John :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist
participants (3)
-
Dave Riddle (Technical Dept.) -
Ian Eure -
John Robertson