NAD C300 Output is barely audible HELP! - Page 2 - diyAudio
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Old 5th April 2012, 08:39 AM   #11
jaycee is offline jaycee  United Kingdom
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Join Date: Apr 2004
Location: Norwich, UK
Hm, the internal layout doesnt look like whats described in the C320 service manual!

Check for the blown fuses. If they are blown, it is likely one or all of the output transistors have failed - these are the 4 square devices on the large heatsink to the right of the power transformer. The service manual says these are 2SA1943/2SC5200 (very popular in amplifiers), but your picture suggests they are not. I'd want to see the correct schematic before advising further.
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Old 6th April 2012, 02:54 PM   #12
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Join Date: Apr 2012
Quote:
Originally Posted by jaycee View Post
Hm, the internal layout doesnt look like whats described in the C320 service manual!

Check for the blown fuses. If they are blown, it is likely one or all of the output transistors have failed - these are the 4 square devices on the large heatsink to the right of the power transformer. The service manual says these are 2SA1943/2SC5200 (very popular in amplifiers), but your picture suggests they are not. I'd want to see the correct schematic before advising further.
Hi. The 5A fuses are blown and got blown again after I replaced them and the amp is still playing distorted and barely audible ,same from L and R. channel. Also, pictured in the photo is a C300 not a C320 .
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Old 6th April 2012, 03:17 PM   #13
Bill_P is offline Bill_P  United States
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Location: New York, the vampire state
The output transistors are P55NE06L. Service manual can be found on ElektroTanya | Service manuals and repair tips for electronics experts.
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