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Print Page Chess Computer Community
    General Category => Discussions about Chess Computers => Message started by: TerryG on August 21, 2009, 09:49AM
	

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Title: Mephisto Academy Repair(s)
Post by: TerryG on August 21, 2009, 09:49AM

I recently changed an LED on my Academy and thought I'd share my experience. I have taken several photographs of the procedure but cannot see how I can upload them, can anyone advise?

First remove all (9) screws from the base. Then the 2 screws from the module cover. Taking care not to present any static charge to the components, carefully fold back the main computer pcb (away from you). It is handy to do this on a workbench or table with perhaps a newspaper to protect the surfaces. Remove the screws from the playing surface where the reeds etc are (I've forgotten how many there are - sorry) to remove from the wooden case.

Most of this procedure has been covered befor, however here it is again After identifying the the faulty square, place a chess peice above and listen to hear if the reed operates. Connecting a test meter across the reed will determine if the component is faulty - a high resistance then it is faulty but if a short circuit, then the reed is ok and the faulty component must be the LED or diode. In my case I proved the LED faulty. Unsolder the appropriate component taking care not to splash solder over the pcb. Insert component making sure LED or diode is correct orientation, test first if unsure. If changing a reed be very careful not to crack the gl(oops!) case.

When all done re(oops!)emble, the module cover is rather tricky to replace as the screws are very short (a few swear words could be heard coming from my workshop when I did this). Hopefully all will be well and the Chess computer works. In my case it had a new fault!

When I turned on my machine I got an 'Error' - if I reset the machine it would work ok, but after being switched off for about 10 minutes the error would reappear. (turning off then back on soon after, the machine was fine).

I got thinking that the memory backup battery must be faulty. I took the thing all apart (again!) then tested the CR2032 battery, which was only 0.4volts. Mephisto computer batteries are welded to the holder so the lot has to be removed and a new holder obtained (and new CR2032 battery). In the UK I obtained part number LOAC1 from Maplin supplies. I drilled another hole to take the new holder - making sure contact was ok to the + and - pcb tracks. The holder had small feet which I snipped off as the battery now sits higher on the pcb. Also to prevent any touching to the playing board pcb I stuck a few layers of insulating tape on the pcb. With it all re(oops!)embled the computer now functions perfectly and the game can be saved for presumably until the battery runs out.

regards
Terry


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Title: Re:Mephisto Academy Repair(s)
Post by: tony on August 22, 2009, 10:55AM

hi Terry, I am curious to know what other mephisto's have a welded in battery that may need replacing at some time. could this be particular to just that model? anyone know if this is done by other manufacturers or is it just mephisto? regards, tony


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Title: Re:Mephisto Academy Repair(s)
Post by: TerryG on August 22, 2009, 11:33AM

Tony,

The backup battery of Mephisto Vancouver and I think the Roma (I used to own one before trading in for the Vancouver) are welded as I think the similar Monte Carlo. I think this was done so that the battery would always be connected despite any considerable knocks. Mind you a considerable knock would probably render the thing useless!!
As for the other Meph's or any other makes I don't know. Maybe this one could go on and on?

Terry


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Title: Re:Mephisto Academy Repair(s)
Post by: bobosse on August 25, 2009, 07:40AM

Inside the RISC display module, there is also a welded battery.

[quote author=tony link=board=1;threadid=1848;start=0#msg12328 date=1250963754]
hi Terry, I am curious to know what other mephisto's have a welded in battery that may need replacing at some time. could this be particular to just that model? anyone know if this is done by other manufacturers or is it just mephisto? regards, tony
[/quote]



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