MSefi.com read only forum (Jan.15,2018)

Got a V3 card that have been running a MS1 cpu but decided to go to a MSII cpu now, made the needed mods and started it up on the stim, everything seems to work except it wont give any signal to the injector channels?

Went back to MS1 cpu, injector channels work as they should.

I've got a scope and I'll try to scope the pins on the MSII cpu and the nand gate, damn those things are tiny...

Anything in particular I shuld look for? Can it be a software related problem? I flashed it witht he latest code from msefi but it still is the same.
Test mode wont give me anything either.
The odds for both channels going dead at the same time don't seem too high or?

U1 socket cpu card removed power on,
21 5V
22 5V
39 0V
40 0V

Card inserted, stim running, megatune showing about 10msec PW,

21 pulses between 4.25 and 5V
22 pulses between 4.8 and 5V, you can barely see the same pattern as on pin 20.
39 pulses between 3.75 and 5V
40 same as above

74HC00
pin 14 5V
1 they basically all pulses between 4 and 5V according to the required PW but why wont they go all the way down to 0V?
2
3
4
5
6

Update, removed the HC7400 and checked signals from the cpu, they now drops all the way to 0 as they should.

I guess the hc74 are toast for some reason, a new one comes tomorrow and we'll see what happens when a fresh one is put in.

It's up and running again