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Help needed for replacing 5101 RAM for system 1 pinball?


mgjock

Question

Help needed for replacing 5101 RAM for system 1 pinball?

 

Hi,

 

I need to replace the 5101 CMOS RAM in the backbox of on my Sinbad pinball. I have already purchased some new RAM and the old RAM is still on the board. I have tried pulling the old RAM from the board by hand but it won't budge. Should the old RAM that exists on the board be easily removed by hand? Or is it soldered on? Can someone provide me with some simple steps on what I have to do on how to remove the old RAM and replace it with the new RAM?

 

Thanks

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Guest Burra749

You will only be able to remove it easily if it is socketed. You will still need to pry it from the socket carefully with a small screwdriver.You dont want to damage any of the tracks that may be under it.

 

If it is not socketed you will need to desolder the original one first. The easiest way I find is to cut each leg off the RAM & remove them individually with a soldering iron.

Replace it with a socket so it is easy to replace in the future if needed.

Make sure you put the new one in the correct way around, if you dont you will most likely fry it.

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If you know what you are doing, I apologise as I am not trying to be a condascending bastard:

 

Please, if you are unsure of what to do, there are people here who could do the work for you and fix that board up.

 

These boards are getting old and frail (the copper tracks can come off the PCB very easily) - and are exactly NOT the kind of board to practice or learn on.

 

If you are not sure, perhaps a new thread asking for someone who can do it for you, including testing the PCB thoroughly.

 

Can you upload a picture of the area where the chip is? Just to make sure if it is socketed or not?

----

 

Now with that said, if you are OK with an iron and know what you are doing, then yes, you should remove the old IC and replace it with a socket for easy repair in the future if needed. The old IC really needs to be destroyed to remove it safely - cut all the legs off it (as close to the chip body as possible), remove the chip body and desolder and remove each leg individually. This will minimise the heat stress on the PCB.

 

Remember the 5101 is very static sensitive and should be handled carefully...

 

----

 

PS Update your location in your profile, someone may be nearby to lend a hand.

 

Cheers

Jacob

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thanks for the latest info, help and concern.

 

i have decided to follow all the useful help that has been posted on here.

 

so far, i have bought the new 5101 ram and a new 22-pin ic socket. i have cut off the old original ram with a dremel cutting tool. the old ram has come off leaving the legs still soldered on the board. i will watch a couple of youtube videos on how to solder sokets onto boards and i will also practice on a couple of old pc boards first before attemtping it myself. i am still undecided if i will attempt it myself, i guess it will come down to how my practice runs go and how confident i will be after them. however, before giving it a go myself i am also happy to hear if anyone wants to help with the desoldering/soldering part of the process if you live near me. i live in the eatsern suburbs of sydney. happy to hear from anyone who lives near by willing to help? thanks again for all the great advice and help.

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im 99% sure its the ram. the battery pack and batteries are working fine. the pinball works fine except it can't hold any memory of scores, high scores, credits etc. the ram looks extremely old and rooted. is there anything else i need to check?

 

the ram i have purchased is PCD 5101 P (MRM8422 1 Y)? is this ram ok?

 

 

 

make sure it is a 5101-1L or it wont work

 

also what makes you think it is the ram to begin with

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im 99% sure its the ram. the battery pack and batteries are working fine. the pinball works fine except it can't hold any memory of scores, high scores, credits etc. the ram looks extremely old and rooted. is there anything else i need to check?

 

the ram i have purchased is PCD 5101 P (MRM8422 1 Y)? is this ram ok?

 

That ram is fine

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reading this thread is like hearing someone scratch a blackboard. its making me shiver!

 

dude, be careful, many boards are screwed up by inexperienced repairers. if you can't tell straight up if somethiing is socketed or soldered then conclusion is that you've never soldered before. i think its great you want to DIY but don't jump straight in on IC replacement, take the advice here and get some help...:)

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