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Rockseries 3000w gate output waveform
Rockseries 3000w gate output waveform
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Old 25th April 2019, 06:48 PM   #1
joselorenzo is offline joselorenzo  Mexico
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Default Rockseries 3000w gate output waveform

Hello
Someone in the forum has repaired or has a way to help me with a ROCKSERIES 3000w amplifier.
I have doubts about the correct and good waveform in output transistors .

I get in the gate pin transistor IRFP260N mosfet
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File Type: jpg 1.jpg (487.4 KB, 45 views)
File Type: jpg 2.jpg (260.8 KB, 44 views)
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Old 25th April 2019, 06:55 PM   #2
Perry Babin is offline Perry Babin  United States
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Please read the 'best initial settings' section on page 73 of my car audio site.

You have to center the trace before looking at the signal.

Use the ground position in the coupling switch to set the trace.

Use DC coupling when viewing/photographing the waveform.

Set the timebase so that you have about 3-4 cycles displayed.

Why are you questioning the signal you see?
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Old 25th April 2019, 07:06 PM   #3
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Rise time is clearly bad. Check drivers and resistors or diodes in the gate-driver path.
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Old 25th April 2019, 08:21 PM   #4
Perry Babin is offline Perry Babin  United States
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#3:
In some amps, they use a parallel resistor/diode to induce deadtime. I don't know if that's true for this amp.

joselorenzo :
Can you post a couple of good quality photos (in focus, no flare from the flash...) of the areas indicated in the attached photo?
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Old 25th April 2019, 11:14 PM   #5
joselorenzo is offline joselorenzo  Mexico
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The amplifier I have tried to repair twice.

Now this last attempt changes
U9, U11, Q3, Q4, Q6, Q7, Q8 and Q9.
All IRFP260N are also new.
I have doubts with the waveform because I have no experience in this amplifier design

EDIT : I have problems uploading pictures
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File Type: jpg U11.jpg (336.1 KB, 36 views)

Last edited by joselorenzo; 25th April 2019 at 11:39 PM.
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Old 26th April 2019, 12:51 AM   #6
joselorenzo is offline joselorenzo  Mexico
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More pictures
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File Type: jpg U-9.jpg (326.5 KB, 31 views)
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Old 26th April 2019, 03:12 AM   #7
Perry Babin is offline Perry Babin  United States
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After looking at the drive circuit, I'd suspect the NPN driver transistor (DK) but check the components listed in post #3.

The attached image is more what I'd expect. It was taken with the rectifiers removed from the amp.
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Old 26th April 2019, 03:55 AM   #8
joselorenzo is offline joselorenzo  Mexico
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I try to upload more photos but the high resolution does not allow me
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File Type: jpg 2DRL measure.jpg (199.2 KB, 16 views)
File Type: jpg 2pin2 6n137.jpg (153.2 KB, 15 views)
File Type: jpg 3pin6 6n137.jpg (193.3 KB, 14 views)
File Type: jpg 3baseQ4.jpg (209.0 KB, 15 views)
File Type: jpg 3collectorQ4.jpg (214.0 KB, 15 views)

Last edited by joselorenzo; 26th April 2019 at 04:04 AM.
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Old 26th April 2019, 05:42 AM   #9
Perry Babin is offline Perry Babin  United States
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I think I have a similar amp that I can repair to check the waveforms but if you get it repaired, post it so I don't have to fix that amp.
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Old 26th April 2019, 06:14 AM   #10
joselorenzo is offline joselorenzo  Mexico
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Quote:
Originally Posted by Perry Babin View Post
I think I have a similar amp that I can repair to check the waveforms but if you get it repaired, post it so I don't have to fix that amp.
I'll wait until I can compare the waveforms by getting another similar amplifier or with help from you or some other forum member.

Any advance I do know
Thank you
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