Identifying Broken Connections on an Extensional Viscosity Measuring Instrument

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Discussion Overview

The discussion revolves around identifying a component with two broken connections on an extensional viscosity measuring instrument. Participants explore the nature of the component, its potential function, and the implications of the broken connections on the instrument's operation.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant suggests the component is a fuse chip with two blown fuses.
  • Another participant proposes it resembles an old-fashioned DIL jumper, questioning its purpose.
  • Some participants express difficulty in finding replacement parts and seek suggestions for searching online.
  • Concerns are raised about the fuses blowing for a reason, indicating that replacing them without addressing the underlying issue may lead to further failures.
  • There is speculation about whether the jumpers were intentionally cut at the factory, with some suggesting the melted plastic indicates otherwise.
  • One participant argues that the shape of the broken connections could suggest a fuse design, while others counter that it is likely a programmable jumper block.
  • Participants discuss the possibility of rejoining jumpers and the various uses of such components in electronic systems.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of the component, with multiple competing views regarding whether it is a fuse or a jumper. The discussion remains unresolved with differing opinions on the implications of the broken connections.

Contextual Notes

There are limitations in the discussion regarding the assumptions about the component's function and the lack of definitive identification based on the provided descriptions and images.

watson.894
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What is this component in the middle with the two broken connections? It is on an instrument for measuring extensional viscosity that is not working. It looks like a power amp and a wire wound resistor on the same board got real hot. Don't know if there is any relationship to the two broken connections pictured.
 

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It's a fuse chip with four fuses, two of which have blown
 
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phinds said:
It's a fuse chip with four fuses, two of which have blown
Thank you very much! However, I am having a heck of a time finding similar parts on the internets. Do you have any suggestions on where to find it or how to search for it?

Regards,
Lucas
 
watson.894 said:
Thank you very much! However, I am having a heck of a time finding similar parts on the internets. Do you have any suggestions on where to find it or how to search for it?

Regards,
Lucas
Really? What did you try? Googling for "8-pin fuse chips" got a TON of hits
 
In an event, the fuses blew for a reason. If you replace them before fixing the cause, the new fuses will probably blow also.
 
phinds said:
Really? What did you try? Googling for "8-pin fuse chips" got a TON of hits
What Daz posted looked like an exact match. If it was a fuse, would the top blow off like that?
 
A Dil jumper was used as a low-cost alternative for a DIP switch. They were used for configuration settings that aren't expected to change after manufacture. You plug (or solder) the thing in and then punch or snip the straps as required.
 
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  • #10
very doubtful that it is a fuse.. it would be hard to make accurate current control in that structure
I believe that it t is a programable ( well one time) jumper block.
A cheaper version of a DIP switch
 
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  • #11
watson.894 said:
What Daz posted looked like an exact match. If it was a fuse, would the top blow off like that?
I assumed that it was topless so the fuses could be replaced, but it could be, as others have suggested, a jumper chip. If it IS a jumper chip then something REALLY drew too much current.EDIT: yeah, now that I look, I don't see any "topless" fuse chips so I guess it must be a jumper chip that really got overloaded.
 
  • #12
Is it possible those two jumpers were cut at the factory when it was made?
 
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  • #13
I would try tracing the circuit in that area. How thick are the PCB traces that connect to the jumpers?
 
  • #14
CWatters said:
Is it possible those two jumpers were cut at the factory when it was made?
The plastic looks melted under the two broken links, so that suggests probably not.
 
  • #15
Why would jumpers narrow down to a thin bottleneck shape like that? If I was going to make a fuse out of foil, a shape like that would be perfect. You could fine tune the amp rating of the fuse by how narrow the bottleneck is.
 
  • #16
My guess is that it is something that is one time programmable.
 
  • #17
phinds said:
EDIT: yeah, now that I look, I don't see any "topless" fuse chips so I guess it must be a jumper chip that really got overloaded.

no, specific jumpers are cut to provide a certain function
and when used in this fashion, jumpers can always be rejoined and other combinations cut

I have used this method often in PLL radio systems where I want to set the n=counter number to give the correct frequency

there are many other uses :smile:

Dave
 
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  • #18
davenn said:
no, specific jumpers are cut to provide a certain function
and when used in this fashion, jumpers can always be rejoined and other combinations cut

I have used this method often in PLL radio systems where I want to set the n=counter number to give the correct frequency

there are many other uses :smile:

Dave
Oh, it looked to me like a blown fuse. Guess you're right, though.
 
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  • #19
phinds said:
Oh, it looked to me like a blown fuse. Guess you're right, though.

a trap for young players :wink::-p ( tease, tease knowing you are my senior )
 
  • #20
davenn said:
a trap for young players :wink::-p ( tease, tease knowing you are my senior )
What? I can't be more than 30 or 40 years older than you :smile:
 
  • #21
hahaha --- one needs a sense of humour to survive this world
Thanks buddy :smile:

Friday is here and it's time to go home from the salt mine yipeee

here's part of one totally wrecked bit of gear I dealt with today ... $15,000 GPS receiver very wet and corroded
you can still see the water droplets on those ribbon cables

DSCF5965sm.JPG
 
  • #22
Well, just remember that Friday is POETS day.

Piss
On
Everything,
Tomorrow's
Saturday
 
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  • #23
I assumed they were programming jumpers and were opened with a hot soldering iron.
 

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