Toshiba 42H81 Blows Fuse at Random
This 2001 model projection set has a tough problem to track down, so I'm
hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. |
Toshiba 42H81 Blows Fuse at Random
Chris F. wrote:
This 2001 model projection set has a tough problem to track down, so I'm hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. Maybe you have the wrong fuse in there? Most likely requires a slow blow type.. http://webpages.charter.net/jamie_5" |
Toshiba 42H81 Blows Fuse at Random
It doesn't specify. If it always blew instantly, I would indeed suspect that
the inrush current was too much for it. But once the set is warmed up, it shouldn't be drawing anywhere near 5 amps (at least not on the B+ supply, which is where I assume this is). Some component must be shorting intermittently, and finding it isn't going to be easy unless someone can fill me in on a known issue with these sets. "Jamie" t wrote in message ... Chris F. wrote: This 2001 model projection set has a tough problem to track down, so I'm hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. Maybe you have the wrong fuse in there? Most likely requires a slow blow type.. http://webpages.charter.net/jamie_5" |
Toshiba 42H81 Blows Fuse at Random
"Chris F." wrote in message ... This 2001 model projection set has a tough problem to track down, so I'm hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. I've come across equipment before that has the wrong fuse specified. For various reasons the manufacturer uprated it later on. And of course, the manufacturer might not be in a hurry to point out its mistake ....... Gareth. |
Toshiba 42H81 Blows Fuse at Random
"Chris F." wrote: It doesn't specify. Naught, naughty. That alone is a CE / IEC fail. Graham |
Toshiba 42H81 Blows Fuse at Random
"Chris F." wrote in message
... This 2001 model projection set has a tough problem to track down, so I'm hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. What circuits does this supply line service? Monitor each circuit to see how much each is drawing. Fuse each circuit supplied by this fuse individually if the excessive current is intermittent. When that circuit blows its fuse you know where the problem is. Leonard |
Toshiba 42H81 Blows Fuse at Random
"Chris F." wrote in message ... This 2001 model projection set has a tough problem to track down, so I'm hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. You could temporarily substitute an AC ammeter for the fuse and watch the current. Alternatively, you could use a large fusible resistor, say 1 ohm at 10 watts or .1 ohm if you prefer, and monitor the voltage across the resistor. Should give you an idea what the current is doing. Mark Z. |
Toshiba 42H81 Blows Fuse at Random
"Mark D. Zacharias" wrote in message ... "Chris F." wrote in message ... This 2001 model projection set has a tough problem to track down, so I'm hoping someone can give me some advice. Fuse F850 (5A), in the power supply, will blow at random intervals - sometimes when trying to power up, or the set might run fine for hours, days, or even weeks. Just thought I'd check for any known issues with this set, before attempting what could be a long and frustrating job. You could temporarily substitute an AC ammeter for the fuse and watch the current. Alternatively, you could use a large fusible resistor, say 1 ohm at 10 watts or .1 ohm if you prefer, and monitor the voltage across the resistor. Should give you an idea what the current is doing. Mark Z. That's basically what I plan to do. I have a Fluke DMM that can record min/max readings, I plan to insert it at various points in the circuit and have it record any current spikes when and if they occur. Hopefully it should help narrow the problem down. |
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