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PGM charging circuit question

Thanks, I was worried i did offend you :-) Glad that's not the case...

I have 3 new videos i did in just this week, if your interested :-)

Tim.
 
Is that a re-chargeable coin cell?? The circuit is built for a NiMH / NiCAD cell. NOT a Lithum or any other battery... So even if you left the resistor... it wouldn't work properly.. and could easily over charge it and make the cell leak.

For me.. i think its easy enough to remove the resistor and just use a non-rechargable coin cell :-)
 
I have a revision 1 board here and it still looks absolutely clean. Strangely there's a battery holder with a 3032 Battery inside. Looks like the battery holder was soldered in from somone. I have no idea who i bought this from, years ago. Could it be that this mod is correct or should i better remove the battery and live without saving my high scores?
 

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You can see quite a few tracks that has corossion on them. You really should clean that up. It may be even a good idea to remove the battery holder and clen under it as well. Just to make sure.
 
And then leave the battery completely away? Because i can't use normal baterries like the one which is in now, as i understood.
 
To resurrect this thread a bit, I also have a revision 1 board that someone worked on before, and had a battery holder installed, and sure enough there's like 4.7 volts across it so the charging circuit was not disabled. What is the proper mod for this revision? This thread mentions both adding a diode and also removing a diode/resistor, I also found a guide linked below which mentions removing both the resistor R24 and a diode D2 (which seems to actually match what's on my rev 1 board).

https://www.jamma-nation-x.com/jammax/tutorials.html#pgmbat
 
Hey mate I am working on a battery blaster for my PGM similar to the one I made for the MV1c here:

B

Post in thread 'MVS MV1B/1C battery replacement'

MaRC said:
console
Click to expand...
This battery solution lasts ages, months? years?

The super cap solution is totally different and still a work in progress.
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Otherwise just put a diode 1N5817 or 19 between the positive battery terminal and the board to block the charging circuit rather than remove anything.
 
PGM Motherboard Charging Circuit disable.

All you have to do is remove R28 Parts side (REV 8 to REV 12) (REV14 Already has a proper CR2032 from factory. R13 does NOT exsist)

OR R24 on a REV1 to REV 7. Then just fit a normal CR2032 holder where the NI-MH battery was. Simple! :-)

Tim.
 
Thanks you both for the answer, I opted for removing R24 since it seems simpler (and well, I don't have that diode at hand), but with the PGM turned on I'm still measuring 2.5V across the battery holder (so lower than before but still not zero), is this expected? Doesn't this indicate that it's still trying to charge it?
 
@GC8TECH knows these better than I do. I would think that a logic level MOSFET is attached to the old charging circuit, probably a safety thing for battery charging.
 
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