Need Help: FS-A1ST stopped working

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Par Colemu

Hero (531)

Portrait de Colemu

26-03-2018, 14:03

Jipe wrote:

is your step-down converter realy adapted for 100v ?

I've been using a 110v step down converter with my ST for 6 years now with no issues.
My MFR also shows 512k when switched on, then 1024k when reset, so that's normal Smile

Par gdx

Prophet (3043)

Portrait de gdx

26-03-2018, 15:35

I also suspect the (old) welds that probably did not appreciate the vibrations during the transport.

"Colemu" wrote:

I've been using a 110v step down converter with my ST for 6 years now with no issues.

That's still bad advice.

Par Grauw

Ascended (8457)

Portrait de Grauw

26-03-2018, 15:41

Pencioner wrote:
sdsnatcher73 wrote:

I have the MFR with 512kB expansion. I did notice (when everything was still working) the ST booted on power on with 512kB in the boot logo and 1024kB after a reset. Not sure if that means anything...

I think it is some weirdness of Panasonic computers BIOS because it works this way with my A1WX too, so i suppose it is nothing to worry about.

I think that’s because the FPGA needs some time to initialise (a couple of tens of ms?), and the memory counting occurs before the FPGA is initialised. But the initialisation completes before the boot screen finishes and DOS2 bootstraps, so there should be no issues other than a wrong memory count sometimes being displayed on the boot screen.

Par gdx

Prophet (3043)

Portrait de gdx

26-03-2018, 15:37

Right, I had forgotten this defect.

Par Pencioner

Paladin (955)

Portrait de Pencioner

26-03-2018, 19:33

Grauw wrote:

I think that’s because the FPGA needs some time to initialise (a couple of tens of ms?), and the memory counting occurs before the FPGA is initialised. But the initialisation completes before the boot screen finishes and DOS2 bootstraps, so there should be no issues other than a wrong memory count sometimes being displayed on the boot screen.

Interestingly enough that Wavy 70FD and YIS503IIIR doesn't have this issue. And also that it show 512K on boot on Panasonic but nevertheless all the memory is still recognized by Nextor so it uses whole 1024K

Par sdsnatcher73

Hero (596)

Portrait de sdsnatcher73

26-03-2018, 20:41

I have been using a 110v stepdown converter, but that worked fine for almost 3 weeks, why would it change? Then again I can't rule it out but have nothing else a.t.m.

I have ordered a 100v stepdown from eBay from Japan but it is taking forever to arrive... I could not find any 100v step downs from a NL/EU retailer.

Par Meits

Scribe (5544)

Portrait de Meits

26-03-2018, 20:46

You'd better change the internal transformer. That ain't a surgeon's job.
Before mine got its internal transformer replaced I burnt two 110V/45W stepdown converters. They really stink. They're not made for Japanese equipment so please don't use them.
Be sure to have ordered a Japanese step down converter which is strong enough. There are those strong enough to charge a mobile phone and there are those strong enough to handle a game PC.
Somewhere in the middle would be fine Running Naked in a Field of Flowers

Par sdsnatcher73

Hero (596)

Portrait de sdsnatcher73

26-03-2018, 20:55

What is a good source for 100v step down?

Par Grauw

Ascended (8457)

Portrait de Grauw

26-03-2018, 21:22

I’m very happy with this one, if you can find it…

https://www.msx.org/forum/msx-talk/trading-and-collecting/lo...

Par Meits

Scribe (5544)

Portrait de Meits

26-03-2018, 22:07

Got one of those as well for the MSX2+'es. This stepdown converter should be able to run at least two MSXes at the same time.

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