Soundstream Rubicon 604 not powering on - diyAudio
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Old 24th January 2012, 08:45 PM   #1
azvrt is offline azvrt  Netherlands
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Join Date: Dec 2010
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Default Soundstream Rubicon 604 not powering on

I tried to power up the Soundstream Rubicon 604 I bought with unknown malfunction.
It draws absolutely zero current. Fuses are good and do not blow.

Next time we work on the amp we'll check the schematics and follow the path, maybe check how the remote functions.

Any pointers where to look first ?
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Old 24th January 2012, 08:47 PM   #2
timwebb is offline timwebb  United States
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the voltage on the pwm.
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Old 24th January 2012, 08:49 PM   #3
azvrt is offline azvrt  Netherlands
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You're faster than your own shadow !

What does pwm stand for ? Pulse Width Modulator ? Would that be the SG3524 chip ? (just guessing)
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Old 9th February 2012, 02:40 PM   #4
azvrt is offline azvrt  Netherlands
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Alright, got the measurements from the SG3524 chip.
Got the datasheet from the web. I put the negative lead on PIN1, is that alright ?

Positive lead on PIN:

1 -
2 1.95 VDC
3 0.15 VDC
4 -6.8 milliVDC
5 -6.8 milliVDC
6 3.01 VDC
7 1.96 VDC
8 -6.8 milliVDC
9 3.86 VDC
10 -3.7 milliVDC
11 0.28 VDC
12 12.22 VDC
13 12.22 VDC
14 7.25 VDC
15 12.22 VDC
16 4.63 VDC

Afterwards I removed the board from the heatsink and noticed damage to the underside which I had not noticed looking from topside. Here are some pics:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I previously owned a 604 like this one, but can't remember for sure whether the parts indicated in the following picture were on it. Are they supposed to be ?

Click the image to open in full size.

Last edited by azvrt; 9th February 2012 at 02:42 PM.
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Old 9th February 2012, 02:43 PM   #5
azvrt is offline azvrt  Netherlands
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Damn, can't get the pics to show properly. Here are the links:

ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
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Old 9th February 2012, 04:19 PM   #6
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I see soot marks on the Kapton insulator this makes me think your mosfets are shorted and the gate resistors look fried also. it is likely that the gate driver transistors also failed
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Old 9th February 2012, 05:01 PM   #7
azvrt is offline azvrt  Netherlands
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I wish I knew what gate resistors and gate driver transistors are

Anyway, I was planning to replace all six of the transistors I already desoldered two of (Q145 etc).
I'll probably replace the four nearby tiny upright resistors, which are located between the transistors and group of five capacitors, as at least one of them showed it hat gotten hot, though that might have been caused by me touching it by accident (incompetence ) with the soldering iron
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