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#11
24th February 2006, 11:41 AM
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Re: 845 Meltdown
When you say it was working OK, do you mean that it was still working when you switched it off?
I suspect a short not blowing the fuses tho...... The fuse in my 845 of similar ilk is only a 3A type at the plug and 1.5 slow blows per side inside......
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Who am I? Just another concerned citizen....  ONE LOVE 
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#12
24th February 2006, 07:39 PM
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Re: 845 Meltdown
Two diodes seem to have failed causing the transformer to burn out.
Any suggestions for a replacement? Supprisingly Ornec have not responded to my question about warranty! It is not for sale! I will not be daunted by a little fire! Back to listening to the Pogues, Rum Sodomy & the Lash on the 2A3. Lenco of course! 
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#13
24th February 2006, 08:34 PM
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Re: 845 Meltdown
Quote:
Way to go. I would guess that the rectifiers for the 840v supply to the 845s failed short circuit (they are the big, fat round ones at the back left of the power board)? Replace each of them with two 1000v FREDS (I used IXYS DSE112 from Farnell, p/n 9359389) in series. Regards mark
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#15
25th February 2006, 09:16 PM
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Re: 845 Meltdown
swap you for a dell battery.
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#16
26th February 2006, 12:01 PM
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Re: 845 Meltdown
Quote:
Mark
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#17
26th February 2006, 06:29 PM
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Re: 845 Meltdown
Nick or Global
Do you have the spec of the transformers? The two do not seem just to feed either side equally. Or am I not looking at it correctly? If I am to get new trannys what would be "Best" specification. Thanks ColinA :p
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#18
26th February 2006, 06:56 PM
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Re: 845 Meltdown
I can't remember what else that TX does, I know its 650-0-650 ish for the 845 B+, so I would suggest 250ma for that, it does power one of the 845 heaters, so that 10v @ 3A. I think it may also provide the voltage for the 845 bias, but not sure. That would make the other one provide the driver B+, the other 845 heater and the voltage to power the delay and relay circuit.
__________________
Just about everything I say has been in public use since the 1940's so no one owns the copyright on that. If by any chance its not prior art, then the copyright is retained by me.
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#20
26th February 2006, 10:14 PM
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Re: 845 Meltdown
You won't see anything on the TX's, but if you can see what the TX in question powers it will be a step towards producing a spec.
__________________
Just about everything I say has been in public use since the 1940's so no one owns the copyright on that. If by any chance its not prior art, then the copyright is retained by me.
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