Hi Guys
I have agilent 34401a with frontpanel damage. VFD display is broken and I buy a new one(clone ) from aliexpess. after install new VFD . my 34401a have two beep ( the first one is quiter a bit) and VFD display is bright all segments and suck in this. all buttons is not respond
I remove the display board and connect the mainboard to PC via GPIB and this mainboard working correctly . (just have one error 601) all functions are good
so I think display board had damage too . I have check LM339M but it normal. seem the MCU 80C51 is dead ?
thank you!