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Old 25th January 2010, 07:03 PM   #1
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Default Problems with Nikko Alpha II Power amp (protection cuts off)

Hi!

I have an old Nikko Alpha II power amp which protection cuts off after about 1 minute..Then I turn it off and wait for 10 minutes and try again, and the same thing happens, only this time it happens after 30 seconds..And so on.. The amp acts normal until it cuts off, and all the speaker outputs work fine..

What can it be?

Thanks,

Tomzern (newbie from norway)
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Old 26th January 2010, 02:31 PM   #2
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Location: D-55629 Schwarzerden
This must be this power amp:
Nikko Alpha II Power Amp - Audiokarma.org Photo Gallery
either you have DC at the output after a minute and thus protection cuts off, or some faulty electrolytic caps arround the protection circuit itself - maybe Toshiba's TA7317 -
TA7317P Datasheet pdf - PROTECTION CIRCUIT FOR OCL POWER AMPLIFIER AND SPEAKER - TOSHIBA
are the cause.
Please order your copy of service manual about
Schaltpläne und Bedienungsanleitungen: Schaltungsdienst Lange oHG
info@schaltungsdienst.de
Schaltungsdienst Lange oHG
Zehrensdorfer Str. 11
12277 Berlin-Marienfelde
Tel.: ++49 (0) 30 / 723 81-3
Fax: ++49 (0) 30 / 723 81-500
All electrolytic caps - at least arround so called "hot spots" on the PCB - must be replace. Rifa, FTcap and EPCOS are good brands for replace, even by the small size devices.
Attached Images
File Type: jpg Nikko Alpha ll front.JPG (51.6 KB, 92 views)

Last edited by tiefbassuebertr; 26th January 2010 at 02:35 PM.
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Old 26th January 2010, 08:32 PM   #3
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That's the one yes

I'm delivering the amp to a local AV-technician, so that he can find out exactly which component(s) that causes the problem. I'm hoping it's no big deal, but we'll see

Thank you for your response!

-Tomzern
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