Author Topic: FV-1 stops working when using EPROM  (Read 1146 times)

pruttelherrie

Re: FV-1 stops working when using EPROM
« Reply #20 on: January 26, 2022, 12:56:48 PM »
I think I found your problem. You're switching T1 (pin 12) for internal/external instead of T0 (pin 13). T1 must be grounded all the
time to work properly and T0 is the interal/external program pin. That's why works on internal but not on externals.
Try to cut the vias from pin 13, cut the trace from pin 12 and connect pin 12 to ground and 13 to the jumper/pullup resistor.
It seems you're right, and if you look at the schematic in the first post you'll see that the component definition is already wrong! What program was used and where did the pinout come from?

FantomXR

Re: FV-1 stops working when using EPROM
« Reply #21 on: January 26, 2022, 01:34:26 PM »
Damn! Great spot!

I'll give that a try!!

It looks like I made a mistake when creating the symbol for the FV-1 in KiCad...

I'll try that tomorrow and report back!

Thanks AGAIN!

FantomXR

Re: FV-1 stops working when using EPROM
« Reply #22 on: January 27, 2022, 03:06:04 PM »
Thanks thanks thanks....

I modified the PCB and et voila... it works perfectly!

Great chip! :-)

Sweetalk

Re: FV-1 stops working when using EPROM
« Reply #23 on: January 28, 2022, 04:10:08 AM »
Great to hear that, enjoy!