[Premium-Rx] REGCO RG-5500 Restoration

[David Schofield]

Hi Boris,

On most UK circuit diagrams it means, safety critical component, do not 
substitute.
It's mostly used in mains power supplies Etc. to indicate a component 
that's value, or manufacturer should not be changed.

It's usually found on sacrificial components, I.E. a component that is 
designed to fail in the event of a problem further down the line and 
prevent any more damage occurring.

These are usually things like fusible links, or very low Ohm resistors, 
that are designed to "burn out" in the event of a short circuit further 
down the line.

For example, if you saw a 0R1 resistor on a schematic in series with the 
power feed to another part of the circuit, you may assume that you could 
replace it with a wire link if it had gone open circuit.
This would allow you to get the circuit going again, but you would loose 
your protection, and next time the rest of the circuit failed you could 
have a fire risk Etc.

This is the meaning of the triangle here in the UK anyway, so I'm 
guessing it's the same in the USA.

Cheers,
Dave.S.





On 12/09/2013 06:46, Борис Никитин wrote:
> HI All,
>
> If anyone knows whats mean special symbol-small triangle near some components (resistors) on circuit diagrams of  VHF/UHF receiver RG-5500 by REGCO company?
> I already asked my good friend in USA who got the Manual for that receiver, but no any information about there.
>
> For my opinion it's probably means two things:
> 1) Components marked with small triangle may require some selection and adjustment
> 2)  Components with very tight tolerance
>
> Any ideas?
> Thanks.
>
> Best Regards.
> Boris
>
>
>   
> Борис Никитин
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