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|3rd December 2012, 11:58 PM||#1|
Join Date: May 2010
Soundstandard ES200 schematics anyone ??
I´m trying to repair an Soundstandard ES200 Pa amplifier (China made supposed).
Upon power up, both protect led´s go off, output relays close and one channel works as supposed. When I raise the input potentiometer of the faulty channel, just one or 2 degreees, instead of the green led, the red clip led illuminates and at the same time the protect led also. The channel relay doesn´t open as supposed to and no sound comes out on this channel.
Driver stage consisting of IRF640 on one side and IRF9640 on the other , also some MJE 350 / 340 pre-drivers ??
Many 2L and G1 smd transistors on board.
I´suppose the faulty output stage isn´t burned, since I have very little DC at the output (same on the other channel) , no pops on speaker no hum and i can hear a faint distorted signal at the output, but it can be just crosstalk. Voltages are there, fuses aren´t burned, no suspicious burns or schorts on board. I´ve checked the thermal protections Airpax 67F100 and they are open, but it seems something is muting the signal. I´ve changed input connectors on the output stages, so this rules out the pre-amp stage.
Since it is a mosfet amplifier, can it be that all mosfets are open, or do they usually burn short ??
If anyone could provide a shematic or give me some ideas, I´would be very gratefull.
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