Got a system 11 that recently fussed at me about an adjust failure. I put in new batteries and got it back up and running
Now getting IRQ failure but sometimes will boot to factory settings... only to starting blinking and finally drop the 2 right diagnostic LEDs (5 volt remains lit)

All tests done game off, in circuit -
I've tested the D2 diode and got 4.48V non-banded side and 4.15V band side
Ive tested the D1 diode and got 4.14V on the band side and (this might be a problem) .6 to .8 millivolts on the non-banded side

I don't think I should ready ANY voltage on the non-band side of D1

That means the batteries are trying to run the CPU board not just the ram

No big deal to replace the D1, but could this be causing my IRQ flakiness??