Fusible Resistors

Sorry - meant resistances!

Tom.

Altho a fusible resistor kit is a good idea, don't many manufacturers insist that ion the case of safelty components, the replacement part is the exact part number obtained from them in order to comply with safety regulations

Ron

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Yes, that might well be the case - though I wonder in practice how many of these parts are actually available from the original manufacturer - my understanding from our local repair shop was that most manufacturers were only interested in selling a complete replacement board. The shop isn't too keen on this, because it takes away their margins, and the boards are so expensive that most customers choose to buy a new product (which is exactly what the manufacturers want).

Interesting question though - if you (as a shop) repair something, don't you invalidate its warranty? That being the case, does a repair shop have to issue its own warranty?

Also whose safety regulations are you referring to?

Tom.

-- Thomas Arundel TL: +44 (0) 870 750 4468 FX: +44 (0) 870 137 6005 EM: snipped-for-privacy@fastcomponents.co.uk

----------------------------------------- Fast Components Limited

Come on - throw me a bone here! ;-)

Generally a warranty repair is carried out by a service dept who are nominated to perform such repairs. If an item is out of the manufacturers cover, then the repair should be guaranteed for a set period, generally 90 days here in the uk.

As for the regulations, off the top of my head I`m not sure of the relevant regulation number, but many service sheets carry a symbol next to components like transformers, fuses and fusible resistors etc. Basically it means that this is a safety component and must be replaced with the manufacturers exact replacement part. It also means that instead of paying something like 18 little pennies for the part, you end up paying £2.50 or more!

Ron

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wattages

that

as

That would be easier than re-using fusible resistors, or at least silk screen marked safety resistors, from soon to be scrapped boards.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

for sure it would... Any hints on what sort of resistances / wattages are most commonly required?

A quick scan through my resistor folder[1] shows R22, 1R, 2R2, 4R7,10R, & 47R in .25 watt 2R2 in 1 watt and 15R in 2 watt (probably for some once common psu) and some yellow sleeving covered R22 marked Phillips vcr...

[1] photographic 35mm slide album with the resistors in little poly bags that just fit in the slide pockets perectly.

Ron

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Lune Valley Audio
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I would suggest 0.5W in resistor values

1,2/2.2 , 4.7 , 10 20,47,100 200,470

Smaller than 1 ohm tend to be higher wattage 'emitter' resistors I don't remember coming across more than 470 ohm fusible resistors in any of the mainly domestic kit I repair.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Great Thanks guys, we'll get sourcing :-)