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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Fusible Resistors
We got a call from a customer the other day who asked if we would put
together some Fusible resistor sets for (TV) repair shops. We're a component supplier that specialises in selling sets of components e.g. resistors, capacitors, SMDS etc, the idea being that it a much easier way to stock the bench-top. From what he was saying, a kit of fusible resistors might go down quite well, especially because apparently minimum order quantities make these components expensive (at least in the UK) I wondered if you guys might have any thoughts about which values / wattages / packages are most commonly required when repairing equipment, and what characteristics (if any) we should pay special attention to. I noticed that some suppliers offer these upto 10k - surely they're most useful in lower voltages. Do values adhere to any particular E-series? We were proposing to put together a set to sell for around £10 / $18 with as wide a range of values as possible... Thanks, Tom. -- Thomas Arundel TL: +44 (0) 870 750 4468 FX: +44 (0) 870 137 6005 EM: ----------------------------------------- Fast Components Limited www.fastcomponents.co.uk |
#2
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some suppliers offer these upto 10k - surely they're most useful in lower
voltages. Sorry - meant resistances! Tom. |
#3
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Thomas Arundel wrote:
some suppliers offer these upto 10k - surely they're most useful in lower voltages. 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 -- Lune Valley Audio Public address system Hire, Sales, Repairs www.lunevalleyaudio.com |
#4
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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 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: ----------------------------------------- Fast Components Limited www.fastcomponents.co.uk |
#5
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Oh! Boy
"Thomas Arundel" wrote in message ... 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 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: ----------------------------------------- Fast Components Limited www.fastcomponents.co.uk |
#6
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"kip" wrote in message .. . Oh! Boy Come on - throw me a bone here! ;-) |
#7
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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. 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 -- Lune Valley Audio Public address system Hire, Sales, Repairs www.lunevalleyaudio.com |
#8
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"Thomas Arundel" wrote in message ... We got a call from a customer the other day who asked if we would put together some Fusible resistor sets for (TV) repair shops. We're a component supplier that specialises in selling sets of components e.g. resistors, capacitors, SMDS etc, the idea being that it a much easier way to stock the bench-top. From what he was saying, a kit of fusible resistors might go down quite well, especially because apparently minimum order quantities make these components expensive (at least in the UK) I wondered if you guys might have any thoughts about which values / wattages / packages are most commonly required when repairing equipment, and what characteristics (if any) we should pay special attention to. I noticed that some suppliers offer these upto 10k - surely they're most useful in lower voltages. Do values adhere to any particular E-series? We were proposing to put together a set to sell for around £10 / $18 with as wide a range of values as possible... Thanks, Tom. -- Thomas Arundel TL: +44 (0) 870 750 4468 FX: +44 (0) 870 137 6005 EM: ----------------------------------------- Fast Components Limited www.fastcomponents.co.uk 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 http://home.graffiti.net/diverse:graffiti.net/ |
#9
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That would be easier than re-using fusible resistors, or at least
silk screen marked safety resistors, from soon to be scrapped boards. for sure it would... Any hints on what sort of resistances / wattages are most commonly required? |
#10
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Thomas Arundel wrote:
That would be easier than re-using fusible resistors, or at least silk screen marked safety resistors, from soon to be scrapped boards. 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 -- Lune Valley Audio Public address system Hire, Sales, Repairs www.lunevalleyaudio.com |
#11
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"Thomas Arundel" wrote in message ... That would be easier than re-using fusible resistors, or at least silk screen marked safety resistors, from soon to be scrapped boards. for sure it would... Any hints on what sort of resistances / wattages are most commonly required? 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 http://home.graffiti.net/diverse:graffiti.net/ |
#12
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"
I would suggest 0.5W in resistor values 1,2/2.2 , 4.7 , 10 20,47,100 200,470 Great Thanks guys, we'll get sourcing :-) |
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