CPC 6128 FAULTY RAM

unay · 17:15, 27 February 25

Hi mates,

Does any one tell me which one is the faulty ram? Or is it more than that?

St-BeidE(DE/GB) · 06:49, 28 February 25

If you open the Cpc, you'll have a look at the chips.
In case the brand of your RAMs is µT, replace em all.

Stefan

McArti0 · 07:41, 28 February 25

And isn't this a typical conflict with amsdos?

Check if pin22 40015 is low. When the test is performed.

Rabs · 08:30, 28 February 25

Quote from: unay on 17:15, 27 February 25Hi mates,

Does any one tell me which one is the faulty ram? Or is it more than that?

See Amstrad Diagnostics Wiki

McArti0 · 09:47, 28 February 25

IC212 74LS74 pin5 is Hi. AMSDOS is ON.

Audronic · 23:43, 28 February 25

Quote from: unay on 17:15, 27 February 25Hi mates,

Does any one tell me which one is the faulty ram? Or is it more than that?

The Number 07 at the bottom of the Photo indicates it is "BIT 7"

Keep Safe

Ray

unay · 13:49, 04 March 25

Quote from: McArti0 on 09:47, 28 February 25IC212 74LS74 pin5 is Hi. AMSDOS is ON.

I couldnt find IC212 or 74LS74. And if i find them, i have no idea what am i gonna do with them.

Edit: Btw i tried to piggyback on every single upper side, there is no change on test. The result is the same.

McArti0 · 14:38, 04 March 25

~~And Could You find 40226?~~

I find IC212 on your photo in other topic

unay · 13:12, 10 March 25

Finally change the IC126 and it works

McArti0 · 16:56, 10 March 25

Only one RAM from second bank?

Rabs · 17:02, 10 March 25

Quote from: McArti0 on 16:56, 10 March 25Only one RAM from second bank?

Can happen but best to run a soak test, as I have had a second IC fail sometime later.

eto · 17:32, 10 March 25

Quote from: McArti0 on 16:56, 10 March 25Only one RAM from second bank?

why not?

McArti0 · 18:38, 10 March 25

the warmest place ... nearest keyboard and 2 capacitors on left and right.

Bryce · 12:27, 11 March 25

Quote from: McArti0 on 18:38, 10 March 25the warmest place ... nearest keyboard and 2 capacitors on left and right.

Could of course just be a random failure. They don't need much convincing to fail!

Bryce.

unay · 09:18, 12 March 25

Quote from: McArti0 on 16:56, 10 March 25Only one RAM from second bank?

Yeap, just one ram. Before changing i try the piggyback method, check the heat of rams etc but non of them works.
As a final resort i change the IC126.
And i also run the soak test as well.
There's no problem.

News:

CPC 6128 FAULTY RAM