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20th September 2010, 08:52 PM
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#1 |
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diyAudio Member
Join Date: Aug 2010
Location: Leeds UK
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Arcam Alpha 8R Amp blowin fuses.......
Hi All
 As it says....the 8R amp (Conf. with an 8P in Bi Amp mode!) is blowing fuses ....2 so far!! Had a similar problem with a Mission Cyrus 1 recently, and cured it by replacing 4 X rectifier diodes in the PS....am hoping this might be a similar fix....?  I have a decent meter at hand....but have no idea how to test the O/P transistors.... What would members check first??  Ta Kev/Leeds/UK |
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20th September 2010, 09:46 PM
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#2 |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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You need to check for a short from CE or DS on the output transistors.
Sometimes the driver is wiped out as well.
__________________
http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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20th September 2010, 10:03 PM
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#3 |
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diyAudio Member
Join Date: Aug 2010
Location: Leeds UK
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....Now then.....what is ....'the driver'...?
Kev |
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20th September 2010, 10:31 PM
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#4 |
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diyAudio Member
Join Date: Aug 2010
Location: Leeds UK
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....testing MOSFETS......
With meter set for continuity...
....on LH both semi's show no shorting between pins ....on RH....one semi shorts between all 3 pins, and the other shorts between outer pins..... Farnell lists several replacements for the IRF540....some with different specs  ...... Browse for Products | Farnell United Kingdom which one would suffice??? (I may as well replace all 4...??!) Kev |
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20th September 2010, 10:47 PM
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#5 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Do you know what caused the amp to blow?
Avoid the IRF540N devices as they can't take the heat (literally). Use IRF540PBF or IRF540A. I do have some IRF540 made by ST for sale if you don't have enough to meet Farnell's minimum order.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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20th September 2010, 11:01 PM
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#6 |
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diyAudio Member
Join Date: Aug 2010
Location: Leeds UK
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Do I know what caused the amp to blow.....?
....MAY have inadvertently shorted o/p's while re-positioning speakers
(I know I should've turned off the amps before disconnecting and reconnecting) .......I'll learn in the end..... Of course....that could all be just couincidental...... Kev |
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21st September 2010, 12:14 PM
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#7 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Was music playing at the time?
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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21st September 2010, 07:43 PM
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#8 |
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diyAudio Member
Join Date: Aug 2010
Location: Leeds UK
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...4 X IRF540PBF's (at £1.00 each from local Farnell)....and a 10p fuse later,
and all is well!! Many thanks for your help.... Kev |
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