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Need help to run a salvaged Amplifier board from samsung max dj 730
Need help to run a salvaged Amplifier board from samsung max dj 730
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Old 2nd September 2018, 11:53 AM   #1
bhrt is offline bhrt  India
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Default Need help to run a salvaged Amplifier board from samsung max dj 730

I salvaged a AMP board and the transformer from Samsung dj730 music system.
I also found the schhamatics of the Amp board from the service manual.
Is there a way to make this amp run stand alone?

I don't have the technical know how, If some one could help it would be great.
Please have a look at the attached schematics.


Thanks
Bharat Singh
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File Type: pdf samsung_max-dj730_dj650_kj730_zj730_zj650_sch - 1.pdf (331.3 KB, 33 views)
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Old 2nd September 2018, 02:15 PM   #2
JMFahey is offline JMFahey  Argentina
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On first sight, if you have everything shown in the schematic + the power transformer it looks like it might work on its own.

That said, it is a very complex amplifier, lots of muting/power sensing/protection/relay activation, etc. going on, so I guess that even if amp itself is fine, it might still "not work" because some of those protections I mentioned "do not allow it to".

And I think not only preamp but also crossover is on "the other board", the one you donīt have, you should follow STK power amps inputs (2 channels each) backwards towards the ribbon connectors and inject Audio there, I repeat I fear some preamp controlled (by a microprocessor?) signal must turn amp mute OFF or you will get no sound.

Problem is you claim "I don't have the technical know how" and a "paint by the numbers" detailed step by step guide may be very long and complex for a Forum answer.

But hey, maybe somebody does
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Old 7th September 2018, 11:54 PM   #3
MAAC0 is offline MAAC0  Portugal
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Study the STK datasheet and disconnect the pins regarding muting / protection in order to test. Then try to find out how those circuits work in order to mimic the signals.
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Old 24th September 2018, 08:16 AM   #4
bhrt is offline bhrt  India
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Thanks for your inputs. But seems like I neend the preamp board to run this sucker.
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