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Old 15th September 2012, 04:49 AM   #41
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The board number is PC-3094-E

It is alot different from the 600a4. You have the same schematic I do. I believe its the same as the 551X 4 channel the silver with blue emblem. This is the older 2002 model grey heat sink with the red light in the badge.

I posted a pic of the board and the section giving me issues.

I dont believe I have the right schematic kinda the same set up as a 400a4 just a little different.
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Old 15th September 2012, 10:41 AM   #42
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Are the circuits for the output stage identical in the schematic we're using and your amp?

Did you measure the gate-source voltage for Q310/311 when they were in the circuit?
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Old 20th September 2012, 05:11 AM   #43
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Quote:
Originally Posted by Perry Babin View Post
Are the circuits for the output stage identical in the schematic we're using and your amp?

Did you measure the gate-source voltage for Q310/311 when they were in the circuit?
I did not measure the gate to source voltage before removing Q310/Q311 should I pu them in and check?

I am not 100% if the circuits are the same I have a few 600a4's laying around maybe I will pop one open and look. Seems it would be easier to tell that way.
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Old 23rd September 2012, 09:56 AM   #44
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Hmmmmm
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Old 23rd September 2012, 12:32 PM   #45
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The 550x schematic I have is labeled h400a4.
https://sites.google.com/site/brande...edirects=0&d=1

Not sure its much help.
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Old 23rd September 2012, 08:01 PM   #46
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Should I put Q310 and Q311 back in a measure voltages Perry?
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Old 23rd September 2012, 08:04 PM   #47
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#43:
Yes.
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Old 5th February 2013, 06:28 AM   #48
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Back to this amp.

They measure about the same as the rest of the FETS.

Q311 IRF9540 G-S: +2.967 vdc
Q310 IRF540 G-S: -2.438 vdc

Still have the -2.702 vdc on the bridging terminal.........but.......

IF I increase the bias for that channel just until the amp starts to draw current and leave it all the voltage on the bridging terminal goes away but the 2 fets in that channel start to get warm.

Wierd thing is if I am touching the bridging terminal with my meters probe and adjusting the bias at the same time, when I insert the small screw driver into the pot to adjust, touching the screw driver to the metal in the pot makes it draw current, like 8 amps. If I remove the probe from the bridging terminal it does not draw any current when using the screw driver.
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Old 5th February 2013, 06:39 AM   #49
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Do you see straight line DC on the output or do you see something else?
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Old 5th February 2013, 07:23 AM   #50
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If you are referring to what it looks like on the scope, its not straight line, its a big blur about 3" wide on my scope screen.

If I remove Q305 and Q306 the DC on the bridging terminal goes away.
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