Quote from: Vitrolin on September 22, 2016, 04:49:31 PM
Hi could you take those measurements again with reference to GND at U301 pin4,
pin 6 should be around 15VDC (form D315)
pin 5 needs a scope to be measured see enzos and faheys posts
pin eight should be quite high +300VDC, be carefull it can kill you.!!
the optocoupler on pin 2 is a galvanically isolated feedbak from secondary side, this should be low to operate correctly.
Hey Vitrolin thanks for Ref point,I'm got confused as to where I should put my black DMM lead at. Done what you suggested.
U301 with pin 4 as ref.
Pin 6 has some Voltage fluctuation between 7 to 15Vdc
Pin 8 has from 229 to 300Vdc(yes it is dangerous)
I don't have an isolating transformer..I have a dumb question. If I snap off or dienggage the ground/earth leading out from this amp.Will it be safe for my scope to measure pin 5?