What pins would you scope first on a simasimac SE/30 with no sound?

[smrieck511]

Simasimac.
No sound.
NMI switch functions mechanically but has no effect (does have continuity to GLUE pin 9 and RP8 pin 1).

What would you check first with an oscilloscope for the most basic, necessary elements to pass the POST?

 

[finkmac]

is this the same /30 you've been prodding at for years?

It would help if you kept all your diagnosis questions in one thread, instead of just making endless new ones.

anyways, i'd first make sure that there really is no sound. test speaker connector, test headphone jack, verify all connections on the sound circuit

then if that doesn't help, make sure the ROM traces are properly connected.

 

[robin-fo]

I‘d simply check for trace damage near places of capacitor leakage

 

[smrieck511]

is this the same /30 you've been prodding at for years?

It would help if you kept all your diagnosis questions in one thread, instead of just making endless new ones.

anyways, i'd first make sure that there really is no sound. test speaker connector, test headphone jack, verify all connections on the sound circuit

then if that doesn't help, make sure the ROM traces are properly connected.

Ah man, so sorry to offend...a year off and on yes. You are one world class grumpy ole codger though so congrats on that one. All the stuff you mention is fine.

 

[smrieck511]

I‘d simply check for trace damage near places of capacitor leakage

reloaded board so no cap leakage.

 

[mattsoft]

If you haven't already, get that SE/30 connected to your modern Mac/PC so you can troubleshoot through debug mode: https://recon-68k.github.io/

 

[smrieck511]

If you haven't already, get that SE/30 connected to your modern Mac/PC so you can troubleshoot through debug mode: https://recon-68k.github.io/

Definitely a great idea. I was going to look into Recon. Thanks.

 

[robin-fo]

reloaded board so no cap leakage.

Oh, in that case inspect every solder joint you did with a microscope. By far the most common issue (already did three reloaded boards)