TDS3034B repairs

[hitecelec]

Hi All

I have 2 nos of TDS3034B. Both had a defective power supply

I managed to repair one of the power supplies  ie artesyn NAN40-7615-01. and is working ok.
However in the other unit  the optocoupler IC A1- TCDT1103G( there ia a triangle logo). that was defective. I ordered a new 782-tcdt1103G from Mouser and replaced the IC . the power supply switches on but gives only 2 V dc. I tried another 782-tcdt1103G still same result.
Strangely I pulled out IC A1 - TCDT1103G  from the working unit and replaced it in the defective unit. bingo it started working. As someone had posted in this forum tried by replacing CNYF17-03 too still does not work. How do i source the Original opto coupler IC

Thanks in advance

Regards

Anand

[hitecelec]

Hi All

I replaced it with an optocoupler TCDT1101G of the same mfr. the power supply worked with the fan load.
Yet to assemble and  test the unit as a whole. I hope this helps for folks who are having a similar problem with TDS3034b

thanks

Regards

Anand

[testpoint1]

optocoupler is a problem for change, since as the circuit design, the optocoupler has the certain trigger current, but after several years, the old optocoupler  type you can not find it, even you can buy same type, but they all dismounted from old PCB, I ever tried to buy same optocoupler six times, each time, the test parameter is different.

[hitecelec]

thanks