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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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#1
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Chemical vs standard glass fuses
I have an Audiovox flat panel in the shop for repair. There is an
open 7,0 amp chemical fuse on the power supply board which I am told may be the extent of the problem on this model. Of course it could also be the tip of the iceberg for sure. I won't know until I replace it. The problem is I have no chemical fuses, only glass. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? Thanks, Lenny. |
#2
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Chemical vs standard glass fuses
"klem kedidelhopper" I have an Audiovox flat panel in the shop for repair. There is an open 7,0 amp chemical fuse ** You mean a Polyswitch - right ? ( Polyswitch = a self re-setting, polymer based PTC device ) The term "chemical fuse" is a real stinker and vary rarely used by anyone. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? ** Not likely. ..... Phil |
#3
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Chemical vs standard glass fuses
On May 9, 10:03*pm, "Phil Allison" wrote:
"klem kedidelhopper" I have an Audiovox *flat panel in the shop for repair. There is an open *7,0 amp chemical fuse ** You mean a Polyswitch *- *right ? ( Polyswitch *= a self re-setting, polymer based PTC device ) The term "chemical fuse" *is a real stinker and vary rarely used by anyone. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? ** Not likely. .... *Phil I was under the impression that a polyswitch was a self resettable device, sort of like a circuit breaker.Lenny |
#4
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Chemical vs standard glass fuses
"klem kedidelhopper" "Phil Allison" "klem kedidelhopper" I have an Audiovox flat panel in the shop for repair. There is an open 7,0 amp chemical fuse ** You mean a Polyswitch - right ? ( Polyswitch = a self re-setting, polymer based PTC device ) The term "chemical fuse" is a real stinker and vary rarely used by anyone. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? ** Not likely. .... Phil I was under the impression that a polyswitch was a self resettable device, sort of like a circuit breaker. ** Did you bother to read what I wrote above ? Are you asking about a Polyswitch or not ?? ..... Phil |
#5
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Chemical vs standard glass fuses
klem kedidelhopper wrote: I have an Audiovox flat panel in the shop for repair. There is an open 7,0 amp chemical fuse on the power supply board which I am told may be the extent of the problem on this model. Of course it could also be the tip of the iceberg for sure. I won't know until I replace it. The problem is I have no chemical fuses, only glass. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? Chemical fuses like the 'Belfuse' series are coated with a chemical that burns when the fuse wire reaches a set temperature. They are very fast blow and a special class of fuse. I wouldn't recommend using a standard fuse, since you can cause major damage in the equipment before it blows. What type of power supply are you working with in that unit? If it's a linear supply, can you substitute a variable voltage, and current limited power supply for testing? -- You can't fix stupid. You can't even put a Band-Aid™ on it, because it's Teflon coated. |
#6
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Chemical vs standard glass fuses
On May 9, 10:33*pm, "Michael A. Terrell"
wrote: klem kedidelhopper wrote: I have an Audiovox *flat panel in the shop for repair. There is an open *7,0 amp chemical fuse on the power supply board which I am told may be the extent of the problem on this model. Of course it could also be the tip of the iceberg for sure. I won't know until I replace it. The problem is I have no chemical fuses, only glass. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? * Chemical fuses like the 'Belfuse' series are coated with a chemical that burns when the fuse wire reaches a set temperature. *They are very fast blow and a special class of fuse. *I wouldn't recommend using a standard fuse, since you can cause major damage in the equipment before it blows. * *What type of power supply are you working with in that unit? *If it's a linear supply, can you substitute a variable voltage, and current limited power supply for testing? -- You can't fix stupid. You can't even put a Band-Aid™ on it, because it's Teflon coated. Its a SMPS with several different outputs. There is a feed back circuit I believe that would make it risky to try to sub in a supply. Thank you Michael for the information you provided. Sorry Phil that I blew right past your response however I guess I'd have to wonder if YOU read what I wrote. I thought that I was clearly asking about a Chemical or "pico" type fuse, not a polyswitch. Lenny |
#7
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Chemical vs standard glass fuses
"klem kedidelhopper" Sorry Phil that I blew right past your response however I guess I'd have to wonder if YOU read what I wrote. I thought that I was clearly asking about a Chemical or "pico" type fuse, not a polyswitch. ** Where did you get the name " chemical fuse " from ? Did you invent it ? A "Pico" fuse is simply a wire fuse in a package like a resistor. ..... Phil |
#8
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Chemical vs standard glass fuses
"Michael A. Terrell" wrote in message
m... klem kedidelhopper wrote: I have an Audiovox flat panel in the shop for repair. There is an open 7,0 amp chemical fuse on the power supply board which I am told may be the extent of the problem on this model. Of course it could also be the tip of the iceberg for sure. I won't know until I replace it. The problem is I have no chemical fuses, only glass. Can it do any harm to replace the 7.0 amp chemical fuse with a 7.0 amp AGC type? Chemical fuses like the 'Belfuse' series are coated with a chemical that burns when the fuse wire reaches a set temperature. They are very fast blow and a special class of fuse. I wouldn't recommend using a standard fuse, since you can cause major damage in the equipment before it blows. What type of power supply are you working with in that unit? If it's a linear supply, can you substitute a variable voltage, and current limited power supply for testing? -- You can't fix stupid. You can't even put a Band-Aid™ on it, because it's Teflon coated. You can certainly use a more standard fuse for a quick check. Mark Z. |
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