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Old 16th November 2009, 11:43 PM   #1
SS64 is offline SS64  United States
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Default Massive D400x

Ok I already have too many projects going but here's another... I just bought this d400x. I knew it was broke when I got it.. Its two seperate amps that bolt together in one chassis.. so here's the problem with one half.. The amp tries to power up but the protection light comes on immidiatly after the blue ( power) light comes on.. Pulled the outputs still does the same thing.. Pulled the supplys and checked them all.. they all seem good.. so i checked all the outputs they all seem good.. What do i need to look for next on this half?

Next half....
This side the power supply works.. 145 Volts on the rails.. But it has no output... the one side of the outputs I have checked tests good.. I have noticed that the relays do not activate.. Where do I go from here on this half?
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Old 17th November 2009, 12:26 AM   #2
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Is the board marked D200x?
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Old 17th November 2009, 12:42 AM   #3
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Click the image to open in full size.
This is what I'm working with..
only numbers on the board are ILSIM_D2000_v40, that I can find that is...
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Old 17th November 2009, 12:44 AM   #4
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Can you post a photo of the component side of the audio driver board?
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Old 17th November 2009, 01:01 AM   #5
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Click the image to open in full size.
Hope that is ok
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Old 17th November 2009, 01:15 AM   #6
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It looks similar to one of the 3s-tech boards but I'd expect to see 2 more 8 pin SMD ICs. Are there two ICs on the driver board that are hidden in this view?
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Old 17th November 2009, 01:32 AM   #7
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Click the image to open in full size.
There is also a smt 4558 right behind the rca jacks..
And also in the pic there is a smt 4558 under the black caps on the vertical mount board.
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Last edited by SS64; 17th November 2009 at 01:34 AM.
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Old 17th November 2009, 01:47 AM   #8
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The 13600 is for the remote level control. The one behind the RCA jacks is likely for the input noise canceling circuit. The ones I expected to see would have been on the long driver board.

On the 3s-tech board I referred to, there is a problem with bad solder joints. this one may have the same problems.

The driver transistors (both large and small) run at high temperatures and the solder joints fail. I've also seen several of the smaller transistors fail (open, not shorted). There are probably 4 individual groups of outputs on each side of the amp. Each group is driven by it's own driver transistors. If you find faults and the amp begins to work, don't immediately consider it repaired. You MUST check the gate signal for EVERY output transistor to confirm that it has a strong signal. The amps will operate without having all of the outputs working (some with insufficient or no drive signal). If it's put back into service without ALL of the FETs being driven, the amp will fail.

A strong lighted magnifying glass helps when looking for failed solder connections.

In the attached photo, you can see how each of the 4 driver circuits correspond to groups of outputs. Yours should be roughly similar.
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File Type: jpg IMG_4551b2.jpg (492.7 KB, 109 views)
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Old 17th November 2009, 01:52 AM   #9
SS64 is offline SS64  United States
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Ok Perry.. I have to take it back to the work bench to look alot closer at all the joints.. I did notice one thing though .. with music applied the clipping light does illuminate.. so does that mean that all the IC's are working before the drivers?
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Old 17th November 2009, 01:57 AM   #10
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I don't know what that means. You're probably correct.

Don't forget to confirm that the op-amps have ±15v regulated voltage.
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