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by rubber_jonnie
Fri Jul 10, 2020 4:59 pm
Forum: HARDWARE ISSUES
Topic: Mega st 2 boot problem
Replies: 10
Views: 237

Re: Mega st 2 boot problem

@czietz Cool, that's interesting and very good to know.

@Gotang I'd suggest you leave the diode in place then if it's necessary for the IMP Shifter.
by rubber_jonnie
Fri Jul 10, 2020 3:54 pm
Forum: HARDWARE ISSUES
Topic: Mega st 2 boot problem
Replies: 10
Views: 237

Re: Mega st 2 boot problem

The diod bodge job is factory. I have that fix in one of my Mega as well. Is there a 33ohm resistor on R71, R72 and R74? Why does it look like there is not enough solder on the new memory chips? Must be a bad connection somewhere on those. White screen, black border is often memory fault. Or ROM fa...
by rubber_jonnie
Fri Jul 10, 2020 3:31 pm
Forum: RAM UPGRADES
Topic: 4mb STFM SMD Ram upgrade - FAILS TO BOOT :(
Replies: 14
Views: 192

Re: 4mb STFM SMD Ram upgrade - FAILS TO BOOT :(

The black foam is conductive, so remove it.

Before you de-solder everything, flip the mainboard and test for shorts on that side, it could save you some work.
by rubber_jonnie
Thu Jul 09, 2020 11:29 pm
Forum: RAM UPGRADES
Topic: 4mb STFM SMD Ram upgrade - FAILS TO BOOT :(
Replies: 14
Views: 192

Re: 4mb STFM SMD Ram upgrade - FAILS TO BOOT :(

Hi @Lurch the black foreground is usually a sign of a memory issue, so id investigate that first. As PhilC says, a border with a black or black/corrupted central screen area is memory without much doubt. You could verify with a diag cart, but I've seen this enough times to be fairly sure. The colou...
by rubber_jonnie
Thu Jul 09, 2020 5:03 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari TT (Dual Fan) - Fan Flow
Replies: 12
Views: 133

Re: Atari TT (Dual Fan) - Fan Flow

@rubber_jonnie - second fan flow was pointing inwards which did not feel right. Trouble is, the arrows on the fan body that show direction of flow are generally not very visible, especially on fans with black plastic bodies. People then make assumptions and they're incorrect. If you have a thermome...
by rubber_jonnie
Thu Jul 09, 2020 3:27 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari TT (Dual Fan) - Fan Flow
Replies: 12
Views: 133

Re: Atari TT (Dual Fan) - Fan Flow

@rubber_jonnie and @Tomswork, thanks. My intuition is that it should be both out but wanted to know for sure how the original was setup. I downloaded some of the manuals from that link I sent you and all the pictures I could find show only a single fan. You say the other, non PSU fan was replaced a...
by rubber_jonnie
Thu Jul 09, 2020 3:16 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari TT (Dual Fan) - Fan Flow
Replies: 12
Views: 133

Re: Atari TT (Dual Fan) - Fan Flow

I think we could all do with more sleep!! :dizzy: @rubber_jonnie What is this 'sleep' which you all keep mentioning? All I ever seem to get at this time of year is a bit less ambient light & a short interlude in the birds' singing... :roll: :roll: :threadjacked: It's the bit when I close my eyes be...
by rubber_jonnie
Thu Jul 09, 2020 2:44 pm
Forum: CHAT FORUM
Topic: Household wiring regulations on external wall
Replies: 3
Views: 74

Re: Household wiring regulations on external wall

I can't find a answer to this but maybe someone here knows the regulations.. Basically, there is a single brick wall as part of a kitchen extension. Then plastic trunking with mains cables in it. Though I thought that couldn't be done as there is no damp proofing on this wall at all. I mean damp co...
by rubber_jonnie
Thu Jul 09, 2020 2:35 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari TT (Dual Fan) - Fan Flow
Replies: 12
Views: 133

Re: Atari TT (Dual Fan) - Fan Flow

Tomswork wrote:
Thu Jul 09, 2020 2:31 pm
Yes what rubber_jonnie said both pulling air out i should goto bed before 6am


Tom
I think we could all do with more sleep!! :dizzy:
by rubber_jonnie
Thu Jul 09, 2020 2:02 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari TT (Dual Fan) - Fan Flow
Replies: 12
Views: 133

Re: Atari TT (Dual Fan) - Fan Flow

Have a look in the TT section here, you may find documentation on it: https://docs.dev-docs.org/ My MSTE draws air out of the case at the PSU which follows your PSU arrangement, so that PSU as you say is likely correct. I'd expect both fans to exhaust air that's drawn in out the back to maintain a r...

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