Need Help: FS-A1ST stopped working

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Par sdsnatcher73

Hero (641)

Portrait de sdsnatcher73

25-03-2018, 17:19

So my recently acquired FS-A1ST was acting up today. First I got some garbled characters after correct text. Then I got a horizontal line above the boot logo. Then nothing, I was using it with a MFR SCC+ SD in slot 1. I gave it some light taps on the top besides the cartridge slot (no cart inserted) and turned it on and it seemed fine, then started it up with Nemesis 3 original cartridge and that also started. I then re-inserted the MFR SCC+ SD and started it up, only black screen..

Power light turns on, screen goes black (indicating there is a signal) but it does not appear the machine boots (there is also no beep sound).

The machine was upgraded to 512kB by the eBay seller.

Any thoughts on what could have gone wrong??? Some reassurance it is fixable will be very much appreciated!

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Par djh1697

Paragon (1410)

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25-03-2018, 17:42

Does the machine work ok with out the MFR SCC+ inserted? yes?
Does your MFR SCC+ work in other MSX machines? Have you tried the MFR SCC+ in the other slot?

Par sdsnatcher73

Hero (641)

Portrait de sdsnatcher73

25-03-2018, 17:50

It did work at some point without the MFR but then no more (not at home right now). The MFR did still work in the NMS 8245. ST does not boot without cartridge at the moment I left home. I will recheck (obviously) when I get back home.

I updated the first post, the machine was upgraded to 512kB by the eBay seller.

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...

Par Jipe

Paragon (1366)

Portrait de Jipe

25-03-2018, 18:05

check if battery for savingS-Ram is inserting on the ST , remove it and try
check the slot connector if a lyre connector is not breaking

Par sdsnatcher73

Hero (641)

Portrait de sdsnatcher73

25-03-2018, 18:28

So I came home, removed the batteries, powered on the machine and it has boot logo again (I had it disconnected from power for some time)! Reinserted MFR black screen again. Removed the power cable for a short while, reinserted and it boots again, tried Nemesis 3 and it also started up. Konami logo appeared, game logo, then the demo starts and after a couple of seconds I noticed the stars that are flowing in the screen are not round and appear flickering. Then the machine freezes again. Cartridge slot does not appear to have anything wrong with it. I am suspecting it is a RAM or VRAM issue (but I have no hardware knowledge).

Par sdsnatcher73

Hero (641)

Portrait de sdsnatcher73

25-03-2018, 18:35

And it has been warming up these days (spring has arrived in the Netherlands), it has been quite cold the last few months and the machine came from Russia. Could this be temperature related?

Par Jipe

Paragon (1366)

Portrait de Jipe

25-03-2018, 19:46

this ST have the original 100v Power Supply or other voltage ?
then boot have you : Main RAM : 512Kbytes ?

Par sdsnatcher73

Hero (641)

Portrait de sdsnatcher73

25-03-2018, 22:28

Yes 100V and have been using step-down converter. It was showing Main RAM 512 during boot, now of course black screen only. I had run a memory test program and that showed no errors at that time, but again it was colder then than it is now.

I have contacted the seller. He suspects soldering on the RAM chips. I will send the machine back to him so he can fix it, fingers crossed (and again couple of weeks without my beloved new toy). Hope it is just the RAM...

Par Jipe

Paragon (1366)

Portrait de Jipe

26-03-2018, 12:29

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

Par hamlet

Scribe (2605)

Portrait de hamlet

26-03-2018, 12:33

Jipe wrote:

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

Good point. My ST have the same issue with a 110V converter, not with 100V one.

Par Pencioner

Paladin (979)

Portrait de Pencioner

26-03-2018, 12:41

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.

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