New battery for NMS8250

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By herres88

Rookie (25)

Аватар пользователя herres88

13-08-2021, 10:23

My msx doesn’t save time and date settings, because the battery doesn’t charge anymore. I found a replacement battery of this kind on this site. https://www.pilesminute.com/1060-sanyo-11-x-505-n-50-sb3-36v...

But before i fuck things up.. how do i replace it? Do i cut the wires, desoler the left-over wires, and put the new one in? Or do i desolder the old with the wires stil connected and and solder the new one on?

I’m asking this because i don’t have special solder stuff for small electronics and i don’t want to kill my msx.

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By edoz

Prophet (2385)

Аватар пользователя edoz

13-08-2021, 10:34

I think i should cut the wires and attach the battery to it without desoldering it from the motherboard to avoid damage on the motherboard.

By Augusteijn

Rookie (24)

Аватар пользователя Augusteijn

13-08-2021, 12:02

I personally would choose your first method, it is more solid. Don’t worry about the motherboard, but remember to have your soldering iron at medium temperature. Don’t use an iron without temperature control. I have soldered a lot on these 8250 series, just recently, and never experienced problems with damage

By Meits

Scribe (6446)

Аватар пользователя Meits

13-08-2021, 16:39

I've done quite a few of those just recently.

Be sure to cut out D130.
Be very careful with the solder pads. They come loose very easily.

By herres88

Rookie (25)

Аватар пользователя herres88

14-08-2021, 20:00

I’ll let it get done. I’m to scared i will ruin shit.

By SkalTura

Champion (331)

Аватар пользователя SkalTura

25-08-2021, 12:46

Where do you live herres88...?
Should you live near Tilburg in the Netherlands, I have over 35 years of experience soldering, and would be glad to help...

By Meits

Scribe (6446)

Аватар пользователя Meits

25-08-2021, 14:55

You can always mail the mainboard to someone Smile

By siddy6581

Master (175)

Аватар пользователя siddy6581

25-08-2021, 22:50

I'm curious. What could happen if you just cut out the battery but leave the space empty?

By S0urceror

Master (184)

Аватар пользователя S0urceror

26-08-2021, 20:43

The MSX still works but it doesn’t remember at startup the date/time, 40/80 column mode, colors, etc. I know because I have it removed myself. Better to be careful. Although I like Meits’s approach.

By Meits

Scribe (6446)

Аватар пользователя Meits

26-08-2021, 21:25

I took that method from hardware master Omega.

By siddy6581

Master (175)

Аватар пользователя siddy6581

26-08-2021, 23:25

Which one is the D130?

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