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alazira		#1 Posted : Friday, November 11, 2011 3:40:26 PM(UTC)
Rank: Member Groups: Member Joined: 1/3/2010(UTC) Posts: 15 Location: Las Vegas		Hi, I changed the 80MHz clock with a CCHD 950-25-100 on my BufII. Install seemed to go well but on powerup lock LED stays on regardless of source attached or not. No sound output either. Any troubleshooting ideas?
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alazira		#2 Posted : Friday, December 2, 2011 3:36:48 PM(UTC)
Rank: Member Groups: Member Joined: 1/3/2010(UTC) Posts: 15 Location: Las Vegas		Ok, so I thought I had killed the DAC and purchased a Buf III. Installed the tridents from the old board and the same problem. Finally tracked it down to the 1.2V trident. The LED's light up so I didn't know anything was wrong with it. So, new problem: If the LED's light, what could be the issue?
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alazira		#3 Posted : Friday, December 2, 2011 3:39:39 PM(UTC)
Rank: Member Groups: Member Joined: 1/3/2010(UTC) Posts: 15 Location: Las Vegas		BTW, I noticed the AVCC has changed from the one on the BUFF II. Any significant difference here?
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Russ White		#4 Posted : Friday, December 2, 2011 3:40:36 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)		Could be any of the other active components. Opamp or either of the two transistors. You could try changing those or just get another 1.2V Trident.
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alazira		#5 Posted : Friday, December 2, 2011 6:32:41 PM(UTC)
Rank: Member Groups: Member Joined: 1/3/2010(UTC) Posts: 15 Location: Las Vegas		I'm always into rehabilitating old/broken boards (converted a legato II to III). However, I don't know the part#'s. I know you'd rather not post that information. Perhaps you could let me know privately?
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alazira		#6 Posted : Tuesday, January 3, 2012 4:36:12 PM(UTC)
Rank: Member Groups: Member Joined: 1/3/2010(UTC) Posts: 15 Location: Las Vegas		Okay, new 1.2V reg and the BufII is back in business. I also now have the Buf III and when I switch the two (same power supplies, regs, IV) the Buf III has a feint high pitch whine (oscillation?)on both channels, whereas the Buf II is silent. Anyone else come across this?
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Russ White		#7 Posted : Wednesday, January 4, 2012 6:02:13 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)		Sounds like a high speed ground loop. Try isolating things a bit.
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alazira		#8 Posted : Monday, January 9, 2012 1:11:56 PM(UTC)
Rank: Member Groups: Member Joined: 1/3/2010(UTC) Posts: 15 Location: Las Vegas		Russ White wrote: Sounds like a high speed ground loop. Try isolating things a bit. Thanks Russ. When you say isolating, do you mean shielding?
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