Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by exxos »

Globox wrote: Thu Sep 17, 2020 6:07 pm But the top right led (for floppy i think?) not working, and still not working after going back to stock doesn't ring a bell to anyone?
Yeah, normally a RAM or ROM fault. You can tell if ROM is running or not because the diagnostic cartridge should theoretically boot... Or you can use a oscilloscope and checked the ROM chip enables to see if they are switching power up or not...

If the ROM chip enables are pulsing several times at power up, then the machine is at least attempting to boot, which generally indicates the machine has a RAM fault... And of course the floppy LED will not blink unless the operating system is running which of course needs working ROM and RAM.
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by Globox »

OMG I feel so stupid now!
Didn't check for continuity on the shifter adapter before installing it onto the motherboard...
Now I did, and it seems like quite a bit of the connections aren't soldered well... :oops:
Used the the multimeter a few times to find out which pins, but measurements aren't consistent, I guess this is because touching them with the multimeter made some of them make/lose contact.
But these were the bad pins in the first measurement:
7, 13, 21, 22, 24, 25, 26, 35
But I don't know if this many connections were bad when I turned on the Atari...
I have no idea if this can cause damage to my Atari or not, but i suspect it can?
If so, how bad could the damage be?
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by exxos »

I shouldn't think it would have caused damage .. Probably you are missing the 16mhz output from the shifter which would explain why you have no valid video output as the entire board won't have any clocks..
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by Globox »

exxos wrote: Thu Sep 17, 2020 9:49 pm I shouldn't think it would have caused damage .. Probably you are missing the 16mhz output from the shifter which would explain why you have no valid video output as the entire board won't have any clocks..
But does that also explain why it still doesn't work after I put it back to stock?
Plugged in the shifter back in the original socket so problem should be solved then, no?
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by exxos »

Ah true.. You would have to check then clocks with a scope..
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by Globox »

exxos wrote: Thu Sep 17, 2020 10:05 pm Ah true.. You would have to check then clocks with a scope..
Don't have an oscilloscope :(
Why do i need to check them?
Is it a problem caused by the bad soldering on the shifter adapter after all then?
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by PhilC »

Do all the pins on the MMU and socket look ok? And have a look at the shifter socket, its possible due to age that the sprung connections are corroded or simply bent so that they don't make a good connection any longer.
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by exxos »

Globox wrote: Thu Sep 17, 2020 10:15 pm Don't have an oscilloscope :(
Why do i need to check them?
Because your machine is dead and you suspect a dead shifter ?
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by Globox »

exxos wrote: Thu Sep 17, 2020 10:29 pm Because your machine is dead and you suspect a dead shifter ?
Yeah like I said, my knowledge of electronics is way too low to attempt stuff like this, but at least it's a great learning experience!
Only hope I can get it fixed :p
So i guess there's no way to check for a dead shifter with a multimeter?
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Re: Questions regarding a 4mb update on 1040STF, motherboard C070523-001 REV. C

Post by exxos »

Globox wrote: Thu Sep 17, 2020 10:43 pm So i guess there's no way to check for a dead shifter with a multimeter?
Nope. Like I suggested, @Steve is the one to send your machine to figure it out.
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