Harman Kargon AVI=150 Thermal shot noise - diyAudio
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Old 18th January 2007, 02:31 PM   #1
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Default Harman Kargon AVI=150 Thermal shot noise

Hi, i m a new member. I reside in Singapore. I got a AVI-150 months ago. When i turn it on, it works perfactly in the first 5 to 10 minute. But after that, it started with a loud "Poom !" from the right speaker. I knew that it's a kind of transistor failure & cause DC off-set on the right channel. Anyone could lead me to a link to get the circuit schematic? Or maybe just let me know what transitor is used on the differential circuits?
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Old 18th January 2007, 08:01 PM   #2
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Have you checked for bad soldering ??
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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
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Old 19th January 2007, 03:04 AM   #3
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Alreay checked & resolder all suspect joints.
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Old 21st January 2007, 09:08 AM   #4
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Default harman Kardon shot noise

Spend the who;e sunday afternoon to replace & swap some of the 2SC3200 (Swap) 2SA1268 (Replace new) problem is still on the right channel. But when I shake thr 2SC3206 before the protection circuit come into action. The right ch noise seems stop & then comes back. Will do a AB swap use the same transistor from left ch & see if the noise goes to the left.
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Old 4th February 2007, 02:48 PM   #5
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While i do a left-right swap of the 2SC3206. Accidentaly i cause some short circuit between the legs of transistors. Causing two resister burned. (R227-R & R229-R). I dicided to stop till I get all transistors & resister before I work on it again.
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Old 12th February 2007, 04:11 AM   #6
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Finally I got this AVI-150 sing again. The shot noise is from the 2SC 3206 (Driver).
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