I've just trying to repair the power supply of PM1745. I obtained it with Q805, R805 and R819 burned, but my problem is the value of resistor which connects the base of Q804 with R810 and C809. It is not located at the component side of the PCB but under it, soldered just to the tracks, so it does not have its part number. It is totally burned, so I can not read out its value and I tried to calculate it. But after the first experiments the power supply is working unstable - the B+ seems to be O.K. but the auxiliary voltage (from the second winding of T802) is decreasing after the star-up.
Can anyone send me the schematic or the value of mentioned resistor ?
I've just trying to repair the power supply of PM1745. I obtained it with Q805, R805 and R819 burned, but my problem is the value of resistor which connects the base of Q804 with R810 and C809. It is not located at the component side of the PCB but under it, soldered just to the tracks, so it does not have its part number. It is totally burned, so I can not read out its value and I tried to calculate it. But after the first experiments the power supply is working unstable - the B+ seems to be O.K. but the auxiliary voltage (from the second winding of T802) is decreasing after the star-up.
Can anyone send me the schematic or the value of mentioned resistor ?
Best regards
send me your email by pm and ill send the schematic
it was passed to me as being "dead" after talking to the boys on the floor it seems the picture would collapse to a straight horizontal line so it looks like a vertical problem
checked caps and 1 was dead and 1 low so replaced and heres the bad part the monitor was hooked up to 240v (should have gone to check instead of reading the fuse rating) on the bench and popped the filter in cap (I hope thats all) now have a replacement but will fit next week when I return to work
no signs of dry joints and the LOPT looks good so thought id search out a schematic this week just in case
