Digest for sci.electronics.repair@googlegroups.com - 11 updates in 3 topics

8:40 AM Penedão
Cydrome Leader <presence@MUNGEpanix.com>: Nov 09 05:40PM

> Replacing thermal fuse in wall oven power supply.
> Does fuse measure temperature of ambient, or, temperature based on current through fuse?
 
It just measures heat, doesn't matter where it comes from. But-
 
Keep in mind heating the fuse with current will heat the inside to a
higher temp that just warming the outside as there is thermal resistance
of the device package to overcome.
 
Just be careful soldering the leads and you should be ok.
John Robertson <spam@flippers.com>: Nov 09 10:36AM -0800

On 11/09/2015 8:40 AM, Ivan Vegvary wrote:
> Does fuse measure temperature of ambient, or, temperature based on current through fuse?
> I ask because I would like to attach wire leads to fuse since I screwed up soldering directly to the board.
> Thank you.
 
Thermal fuses are supposed to open when their temperature rises above
their design failure point.
 
Certainly if you pass too much current through it will fail! Most
thermal fuses are on heat sinks or fans and open at relatively low
temperatures to indicate that the fan or cooling system has failed and
this helps to protect the electronics from heat failure.
 
Due to their sensitivity they are hard to solder without opening
internally! You MUST heatsink the leads to protect the element inside
the thermal fuse from getting too hot. A heatsink can be the jaws of
needle nosed pliers or similar clamp with lots of metal to absorb the
heat of soldering. I'm not certain that all types of thermal fuses can
even be soldered - most I've seen have metal clips clamping them to the
wires. You may have to experiment. You probably should get more than one
in case of failure...
 
Pigtail screw-on clips might work fine.
 
John :-#)#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
N_Cook <diverse@tcp.co.uk>: Nov 09 10:14PM

On 09/11/2015 18:36, John Robertson wrote:
> in case of failure...
 
> Pigtail screw-on clips might work fine.
 
> John :-#)#
 
Another tip is to freezer spray the body of the thermal fuse before
pre-tinning the wires and then repeat freezing before soldering proper.
Phil Allison <pallison49@gmail.com>: Nov 09 06:17PM -0800

Ivan Vegvary wrote:
 
> Replacing thermal fuse in wall oven power supply.
> Does fuse measure temperature of ambient, or, temperature
> based on current through fuse?
 
 
** Thermal fuses respond to the temperature of the case and are designed to have low self heating due to current flow. Makers specify the operating temp and also give a max continuous current rating at which self heating is not significant.
 
 
> I ask because I would like to attach wire leads to fuse since
> I screwed up soldering directly to the board.
 
** The thermal fuses I know have wire leads and look a lot like film capacitors or diodes. What have you got ?
 
 
.... Phil
Ivan Vegvary <ivanvegvary@gmail.com>: Nov 10 05:29AM -0800

Thanks everyone! Decided to crimp on some 2" leads and thereby keep soldering heat far away from the Thermal Fuse.
Your help is greatly appreciated.
John Robertson <spam@flippers.com>: Nov 09 10:44AM -0800

On 11/09/2015 5:22 AM, N_Cook wrote:
 
> I can't even find a sensible search structure, eg date-limitation, to
> https://groups.google.com/forum/?hl=en#!forum/sci.electronics.repair
 
> I probably took an image of the message sometime since 2000
 
I just found my earliest post on rec.games.pinball - September 9, 1992
by looking for my old email address jrr@jukes.wimsey.bc.ca
 
So, try looking for your earliest email address!
 
John :-#)#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
Michael Black <et472@ncf.ca>: Nov 09 02:07PM -0500

"Percival P. Cassidy" <Nobody@NotMyISP.net>: Nov 09 03:17PM -0500

On 11/09/2015 08:22 AM, N_Cook wrote:
 
 
> I can't even find a sensible search structure, eg date-limitation, to
> https://groups.google.com/forum/?hl=en#!forum/sci.electronics.repair
 
> I probably took an image of the message sometime since 2000
 
Would "the wayback machine" -- https://archive.org -- work?
 
Perce
N_Cook <diverse@tcp.co.uk>: Nov 09 10:07PM

On 09/11/2015 20:17, Percival P. Cassidy wrote:
 
>> I probably took an image of the message sometime since 2000
 
> Would "the wayback machine" -- https://archive.org -- work?
 
> Perce
 
I tried the supposed usenet archive bit of archive.org and could not
make it work, the same with this
https://www.crunchbase.com/organization/the-usenet-archive
perhaps its just my browser but I got knowhere with either.
I know that in may to august 2001 that google URL had it stored,
all 6 backup floppys of that time, only with email and my .htm files
backed up though, all 6 floppies were perfectly readable on a win98 m/c .
Its an excuse to power up my old IBM AT , to see if it still works, last
time a cap went bang somewhere but it worked ok
N_Cook <diverse@tcp.co.uk>: Nov 10 10:24AM

On 09/11/2015 20:17, Percival P. Cassidy wrote:
 
>> I probably took an image of the message sometime since 2000
 
> Would "the wayback machine" -- https://archive.org -- work?
 
> Perce
 
Putting the 2001 "groups" link of
<http://groups.google.co.uk/groups?selm=47khvl%24o1i%40alpha.aladdin.co.uk&output=gplain>
 
in archive.org gave a saved page with a redirect to
http://groups.google.com/d/msg//-/a0tpNKNr-8oJ
which also turns out to be duff, well in my browser anyway, no
explanatory from Google .
gregz <zekor@comcast.net>: Nov 10 07:23AM

>> circuits which are very sensitive.
>> Mark
 
> Something must be wrong. Nobody ever agrees with me.
 
I didn't even notice the wire.
 
Greg
 
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