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azafeiros		#1 Posted : Wednesday, January 26, 2011 1:43:41 PM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		I have a buffalo 32S for quite some time now and i have enjoyed it immensly until last week when it started to make a terrible sound from the right channel only. The sound started as a minor nuisance but it is deteriorating now and it is very bad now. I would be grateful if you could help me solve this. I realy like my buffalo. Alex
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back		#2 Posted : Thursday, January 27, 2011 3:04:31 AM(UTC)
Rank: Member Groups: Member Joined: 8/24/2008(UTC) Posts: 61 Location: greece		i had the same problem and the current at psu was too low. did you check it?
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azafeiros		#3 Posted : Thursday, January 27, 2011 6:33:36 AM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		THanks for the quick response. I will test the current as you suggessted and get back to you this afternoon with more details and photos. Although, I must stress out that the buffalo was working perfectly and suddently it started to make this noise. I did not touch it in any way.
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azafeiros		#4 Posted : Friday, January 28, 2011 1:22:30 AM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		The current at PSU is ok. Can i test anything else? Edited by user Friday, January 28, 2011 1:25:02 AM(UTC)  | Reason: Not specified
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Russ White		#5 Posted : Friday, January 28, 2011 9:01:01 AM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		I have only seen this occur twice for two reasons. One was an ESD damaged DAC, and one was a dead output stage (and replacing an op amp fixed it).
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azafeiros		#6 Posted : Friday, January 28, 2011 3:37:37 PM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		Russ White wrote: I have only seen this occur twice for two reasons. One was an ESD damaged DAC, and one was a dead output stage (and replacing an op amp fixed it). i am afraid i can`t put my hands on the module. i don`t have experience with smd parts. any suggestions how can i repair it? alex.
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Russ White		#7 Posted : Friday, January 28, 2011 4:34:36 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		You could start by checking voltages at the inputs and outputs of the opamps on the right side of the DAC. See if there is anything that looks out of place. Be very careful that you take care about ESD and proper grounding.
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azafeiros		#8 Posted : Saturday, January 29, 2011 6:43:02 AM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		Russ White wrote: You could start by checking voltages at the inputs and outputs of the opamps on the right side of the DAC. See if there is anything that looks out of place. Be very careful that you take care about ESD and proper grounding. i will check the opamps. what is ESD? grounding is ok. besides the dac was working and this started without touching anything.
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azafeiros		#9 Posted : Saturday, January 29, 2011 4:14:06 PM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		is seems that the problem comes deeper than the output opamps. i don`t know if it is the i/v opamps or the dac chip. it`s hard to take measurements while working. i am afraid about a shortcut since the legs are very close each other.
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pinnocchio		#10 Posted : Saturday, January 29, 2011 10:51:06 PM(UTC)
Rank: Member Groups: Member Joined: 11/3/2010(UTC) Posts: 169 Location: Quebec		ESD = Electro Static Discharge
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azafeiros		#11 Posted : Sunday, January 30, 2011 9:34:05 AM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		pinnocchio wrote: ESD = Electro Static Discharge thanks.
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azafeiros		#12 Posted : Monday, January 31, 2011 4:27:13 PM(UTC)
Rank: Member Groups: Member Joined: 1/26/2011(UTC) Posts: 8 Location: Greece		Russ White wrote: You could start by checking voltages at the inputs and outputs of the opamps on the right side of the DAC. See if there is anything that looks out of place. Be very careful that you take care about ESD and proper grounding. i don`t think i will manage to repair it myself. maybe i could sent it back for repair? i could pay of course since it`s one years old. alex
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