I have got a faulty NAD 310 which has given me sleepless nights.
Firstly the amp blew a mosfet (It was blowing the fuse on one channel)which I replaced and it worked fine and I run it in for a week without any problems. I sold the amp to save for a new only to be told it was not working when connected when the guy who bought it took it home.I was not worried thinking I would find the fault easily. How wrong I was.
The problem I have now is that the green LED comes on for a few seconds then off. The amp is not blowing any fuses at all. I am getting a weak and distorted output from both channels. I have checked and replaced many components even if they test ok. The only faulty ones I have found so far are R244 2.2OHM AND R220 3.3K. The only anomaly I can find with a meter is that the voltage on Q102 and Q104 base pins is 23V and not 10v and 23V again instead of 11.3V on the emitter pin of Q104. I have removed and tested the 2 transistors and they are ok. I replaced them with new ones anyway but still no joy.
Its not economical to have this repaired but I have virtually all the replacement parts so can still use this as practice for troubleshooting.
Any suggestions are very welcome. I have some schematics attached
Firstly the amp blew a mosfet (It was blowing the fuse on one channel)which I replaced and it worked fine and I run it in for a week without any problems. I sold the amp to save for a new only to be told it was not working when connected when the guy who bought it took it home.I was not worried thinking I would find the fault easily. How wrong I was.
The problem I have now is that the green LED comes on for a few seconds then off. The amp is not blowing any fuses at all. I am getting a weak and distorted output from both channels. I have checked and replaced many components even if they test ok. The only faulty ones I have found so far are R244 2.2OHM AND R220 3.3K. The only anomaly I can find with a meter is that the voltage on Q102 and Q104 base pins is 23V and not 10v and 23V again instead of 11.3V on the emitter pin of Q104. I have removed and tested the 2 transistors and they are ok. I replaced them with new ones anyway but still no joy.
Its not economical to have this repaired but I have virtually all the replacement parts so can still use this as practice for troubleshooting.
Any suggestions are very welcome. I have some schematics attached
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