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Soundstream Rubicon 2500.1 part identification
Soundstream Rubicon 2500.1 part identification
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Old 12th August 2018, 04:56 PM   #1
rhempz01 is offline rhempz01  United States
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Default Soundstream Rubicon 2500.1 part identification

I just started to rebuild the power supply in a Rubicon 2500.1 and I found a burnt resistor. R8 anyone know the value of the resistor that belongs here?
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Old 12th August 2018, 05:06 PM   #2
Perry Babin is offline Perry Babin  United States
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See if SoundStream will help. Ask for the schematic or service manual as well. The rub1.2500d is different so make sure you ask for the exact model number.
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Old 12th August 2018, 05:18 PM   #3
rhempz01 is offline rhempz01  United States
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Ok will do thanks.
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Old 12th August 2018, 05:52 PM   #4
rhempz01 is offline rhempz01  United States
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Entire board
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Old 12th August 2018, 07:39 PM   #5
rhempz01 is offline rhempz01  United States
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The other problem is heat. Someone has added extra fans and an extra thermistor to the output section and there is this. Heat between these two. I checked the voltages across the diodes in the power supply section. They are all ok. I have my input 50hrtz at the output transistors.the complaint was it was over heating. I know that the amp comes with the one thermistor and 2fans. Could the extra load and thermistor be causing an issue with the kA3525, and the extra load from four extra fans over load the curcuit?
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Old 12th August 2018, 08:11 PM   #6
Perry Babin is offline Perry Babin  United States
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Where is the heat coming from (PS or output)?
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Old 12th August 2018, 08:22 PM   #7
rhempz01 is offline rhempz01  United States
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This is what the customer told me perry. The powersupply had two transistors that we're diodes and a mix match of transistors, I removed them all and the rectifiers. I would think from the power supply. I will just change the output transistors as well.
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Old 12th August 2018, 08:30 PM   #8
rhempz01 is offline rhempz01  United States
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Has almost no thermal paste applied and the four transistors in one bank, were replaced and they left the driver transistors the same....no new thermal paste? I'm going to check all the recifiers as well. I do have a good drive signal. I'm not sure how they thought that it doesn't have a thermal light just a protection led.
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Old 12th August 2018, 08:37 PM   #9
Perry Babin is offline Perry Babin  United States
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You need to talk to the owner to get more information.

He may have been running it into a very low ohm load.

He could have a bad speaker or a shorted wire.

Was the heatsink getting far too hot to touch and that why the think it's overheating?

Was it heating up at idle?

You may replace all of the FETs and the problem is not with the amp. Or, the problem could be on the driver board (too much current through constant current source).

If there is insufficient heatsink compound, the heat cannot be transferred to the heatsink efficiently.
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Old 12th August 2018, 08:57 PM   #10
rhempz01 is offline rhempz01  United States
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Ok thank you perry.
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