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Soundstream DTR1.2200D
Soundstream DTR1.2200D
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Old 8th April 2018, 07:34 PM   #1
Formas is offline Formas  Jamaica
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Default Soundstream DTR1.2200D

Iíve received 3 units of this amplifier to repair but my findings buy just inspection is the factory glue thatís used on the circuit board has corroded the circuit.
A quick test of the power fets and output fets reveals no direct short all units of the amps can be hooked up to 12v. The owner says they just stopped, no burn no funny sound. One is with power but no sound the others just no switching of power supply.
Iím going to remove some of the larger components so I can clean the board for start but does anyone have a schematic for this design as areas and components are rotted off the board. I should think itís same as the Precision Power or AudioPipe Dclass amps, if Iím not mistaken.
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Old 8th April 2018, 07:59 PM   #2
Perry Babin is offline Perry Babin  United States
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Try this:
http://www.bcae1.com/temp/SLA1500.pdf
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Old 9th April 2018, 11:28 PM   #3
Formas is offline Formas  Jamaica
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Ok, great Mr Babin. Two capacitor was corroded off the board Iíve circled it on the diagram, I would love to know the rating voltage (I see itís 1nf) also can they be replaced by disc capacitor, as I donít think I have these at hand as smd.
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Old 9th April 2018, 11:38 PM   #4
Perry Babin is offline Perry Babin  United States
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Other similar amps use 50v 2200pF caps. Higher voltage would be OK as well.

Disc would be OK.
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Old 27th May 2018, 04:09 PM   #5
Formas is offline Formas  Jamaica
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I’m not getting this amp to start up normally but protection, but when I remove the LM393 IC from the board (power supply section) it starts up. Is this chip defective/too sensitive I don’t have a new one now to try. Or is there any known factors to consider as I don’t want to be removing the chip back and fort and damage the solder pads.
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Old 27th May 2018, 04:31 PM   #6
Perry Babin is offline Perry Babin  United States
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Post the DC voltage on the pads for the LM393.
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Old 27th May 2018, 06:46 PM   #7
Formas is offline Formas  Jamaica
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The voltages are (ref gnd):
1. 4.1v
2. 2.5v
3. 3.7v
4. GND
5. 2.5v
6. 2.1v
7. 4.1v
8. 13.7v
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Old 27th May 2018, 07:08 PM   #8
Perry Babin is offline Perry Babin  United States
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Have you tried to get the diagram from soundstream?

From what I think I know about the circuit, the comparator would have to pull down pin 1 of pin 7. The voltages you posted would not cause either comparator to pull down.
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