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  Mephisto internal memory batt.
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   Author  Topic: Mephisto internal memory batt.  (Read 906 times)
TerryG
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Re:Mephisto internal memory batt.
« on: June 6, 2010, 03:21AM »
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  Tony,
            Yes that would be MUCH easier to deal with.
I thought that the battery was just tight and difficult to get off until I realised it was welded.

                          Terry
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TerryG
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Re:Mephisto internal memory batt.
« Reply #1 on: June 5, 2010, 05:15AM »
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Terry, on the Modena the CR2032 slides in and out of a little holder. no soldering required. I wonder why mephist didn't use this holder on all models that required the batt? go figure
regards, Tony
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TerryG
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Re:Mephisto internal memory batt.
« Reply #2 on: June 4, 2010, 01:05PM »
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Hi,
        The Mephisto Acacdemy (probably also Monte Carlo ??) has an internal battery.

see my post August 21 2009;

  ....... 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 glass case.

When all done reassemble, 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).

[b]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 reassembled the computer now functions perfectly and the game can be saved for presumably until the battery runs out.

            Terry
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TerryG
tony
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Re:Mephisto internal memory batt.
« Reply #3 on: June 4, 2010, 08:15AM »
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thanks Sascha, much appreciated.  regards, Tony
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Mythbuster
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Re:Mephisto internal memory batt.
« Reply #4 on: June 3, 2010, 02:56PM »
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Hi,
Mephisto Almeria, Portorose, Lyon, Vancouver, Genius, Magellan, Risc.

Regards,
Sascha
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Chess Computer Corner: The Community for old Chess Computers and PDA Chess. Please visit me at http://www.warnemuende.cc/forum/portal.php ...
tony
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Mephisto internal memory batt.
« Reply #5 on: June 3, 2010, 04:26AM »
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I know the Modena has internal disc batt. for memory. Does anyone have a list or know of the the other Mephisto's with a internal memory batt? Ihave several and would like to put new batteries in all that have them. The manuals never seem to mention this. thanks, Tony
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