BSSG Posted January 20, 2014 Report Posted January 20, 2014 I´m working now for a long time with my Sirius 250, but last week I switched it on and three buttons were not working anymore: Focus submaster buttons 2 and 10 and brightness submaster button 8. I changed every single IC on the related circuit board, but problem remains. They just do nothing, LED will also not light up. Switches are working electrically. Anyone with a good idea?
iank99 Posted January 21, 2014 Report Posted January 21, 2014 If you've swapped IC's and checked switches then there's not a lot else on those boards to go wrong, however having just looked at the circuit diagrams - each switch connects to the data lines of the 373's via a diode (probably a small signal diode like 1N4148) mounted alongside the switches. It would be worth prodding the diode's to see if all are being diodes and not gone open circuit. The Led's for those switches are not operated directly by the switch but via another 373 circuit depending on a code from the processor - if the LED isn't lighting then the processor isn't sensing the switch closure, which points back to the switch and it's diode. Ian Knight aka The Service Guy - www.serviceguy.co.uk
BSSG Posted January 21, 2014 Author Report Posted January 21, 2014 Thanks, I will check the diodes. Any chance to get the circuit diagram? Would be very helpful.
iank99 Posted January 22, 2014 Report Posted January 22, 2014 Send me an eMail to iank'at'centraltheatresupplies.co.uk and I'll send you the ones I have. Ian Knight aka The Service Guy - www.serviceguy.co.uk
BSSG Posted January 29, 2014 Author Report Posted January 29, 2014 Many thanks, desk is running perfectly again, with the circuit diagram we were able to detect exactly the error, it was one path defective which we replaced by a wire.
iank99 Posted January 30, 2014 Report Posted January 30, 2014 That's good news!!! Glad I could help. Ian Knight aka The Service Guy - www.serviceguy.co.uk
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