Re: Phase 4 test measurements
- --- In GenesisRadio@yahoogroups.com, "Preston" <pdouglas12@...> wrote:
>Thanks for the reply and suggestions. I'll check that PDF and take those measurements when next I get a chance.
> Good work, narrowing the trouble down to the dividers. Now, the divider is just one IC, the 74AC74. You can see its hookup and function in the G40 assembly manual (the G3020 is basically a G40 with different oscillators) which you can download as a PDF on the Genesis site. Do so, and you will see how the 74AC74 works. From the schematic (it is in the top left side of the "core" schematic) it appears to need 5v on pins 1,4 and 10 and 13. I would look for that first, since it is easy to do with a multimeter. If it is getting proper volts, then look to see why your 4x signal isn't getting to that divider.
> That's where I'd start, anyway.
> Preston WJ2V