Hello everybody,
I'm back with a new problem... on my audio-video system Yamaha DRX-730 that doesn't want to power on.
http://elektrotanya.com/yamaha_drx-7.../download.html
As I push the power button, the main relay that cliks (sticks) and 2 seconds later unsticks...
The relay is powered independently of the main system by a little transformer (T502) and its voltages are ok so I don't think there is a problem here with the relay command stage.
On the other side, the Q501 (main mosfet that powers the main transformer T501 that powers the system) doesn't chop the voltage (but the 350V on its drain is ok).
I suspect the mosfet driver (IC502, L6566BTR). But even its Vcc voltage isn't good (very fluctuant from 9V to 12V measured with my DC voltmeter).
About it : I don't understand on the schematic how it is powered ? It is at the secondary from T501 but if Q501 doesn't work... no secondary voltages isn't it ?
So... now I'm stuck... any idea ?
Thank you very much, regards, François.
I'm back with a new problem... on my audio-video system Yamaha DRX-730 that doesn't want to power on.
http://elektrotanya.com/yamaha_drx-7.../download.html
As I push the power button, the main relay that cliks (sticks) and 2 seconds later unsticks...
The relay is powered independently of the main system by a little transformer (T502) and its voltages are ok so I don't think there is a problem here with the relay command stage.
On the other side, the Q501 (main mosfet that powers the main transformer T501 that powers the system) doesn't chop the voltage (but the 350V on its drain is ok).
I suspect the mosfet driver (IC502, L6566BTR). But even its Vcc voltage isn't good (very fluctuant from 9V to 12V measured with my DC voltmeter).
About it : I don't understand on the schematic how it is powered ? It is at the secondary from T501 but if Q501 doesn't work... no secondary voltages isn't it ?
So... now I'm stuck... any idea ?
Thank you very much, regards, François.
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