DarkSide
New member
Hi guys.
Im trying to figure out what is wrong with my power supply from my Jurassic Park, the bridge rectifier died, and the high voltage died, bridge rectifier has been changed and +5 volt is back, found a few dead zener diodes in the high voltage D9/D10/D11, and a dead TR4 (MJE15031) transistor, checked everything else and its within specs.
Also changed a few caps, including C10/C11, changed TR6 and TR2 no change at all.
Problem is now that +68 is +67 volt, -98 is -130 volt and -110 is -150 volts. (Wihout load, im not risking my dmd to test with load.)
Whats going on here ?
Checked the voltage going in to the power supply and 90 volt ac is at 90 volt ac, and 100 volt ac is at 111 volt, a bit high maybe, but i don't think thats why the other voltages are so high.
Im trying to figure out what is wrong with my power supply from my Jurassic Park, the bridge rectifier died, and the high voltage died, bridge rectifier has been changed and +5 volt is back, found a few dead zener diodes in the high voltage D9/D10/D11, and a dead TR4 (MJE15031) transistor, checked everything else and its within specs.
Also changed a few caps, including C10/C11, changed TR6 and TR2 no change at all.
Problem is now that +68 is +67 volt, -98 is -130 volt and -110 is -150 volts. (Wihout load, im not risking my dmd to test with load.)
Whats going on here ?
Checked the voltage going in to the power supply and 90 volt ac is at 90 volt ac, and 100 volt ac is at 111 volt, a bit high maybe, but i don't think thats why the other voltages are so high.