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Joined: 2/16/2009(UTC) Posts: 35 Location: netherlands
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christensenleif@msn.com wrote:I resoldered the whole board best Leif What do you mean by saying this? Are your problems solved now, or not? regards, ed
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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no it was only a reply to exclude cold solder joint as possible/likely problem still minus 1,11-1,2 vdc on both se and bal out when hooked up with piggybacked BIII board best Leif
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Rank: Administration
Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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yes faulty on just one channel but whole board was resoldered/"soldered over" best Leif
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Rank: Administration
Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN
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Ok, well I supposed you could replace all the transistors on the dead side. You might be able to find the killed one if you have a semiconductor analyzer, but that may not work with the parts "in circuit".
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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first I´ll build the L3 that now waits in the norw customs and test if all well, I´ll either just cut them all out(easier) and order new ones, or test them in my multimeter with that feature and replace surprises me though, that the minus 1,1 vdc in one channel on both se and bal doesn´t give any indication
best Leif
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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second L3 inhouse and waiting to be assembled I´ll be back best Leif
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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hello new L3 is installed trimmed and singing what now with the faulty one? do I just replace all mosfets? best Leif
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Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times Was thanked: 70 time(s) in 69 post(s)
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Hi Leif.. Why don't you try running with only 1 FET per half channel. Then you can swap FET's until you find the faulty one(s). Edited by user Saturday, March 10, 2012 11:41:52 AM(UTC)
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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Rank: Member
Groups: Member
Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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what do you reckon Russ? should I just replace the Mosfets? the cost is close to nothing, and if I knew it would cure this shitty fault, it´s definitely worth it, instead of spending more time on this best Leif
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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all transistors replaced on LCH all works perfect case solved HURRAH! thxs guys have a nice weekend best Leif Norway
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Rank: Member
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Joined: 7/27/2008(UTC) Posts: 158
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So you use the LME 49600 buffer ! ? Maybe I will use the jumpers to avoid it. I use the Dexa discret opamp but think the Burson is better !
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Rank: Member
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Joined: 11/21/2008(UTC) Posts: 314 Location: Norway
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I don´t have the buffers at all best Leif
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