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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Repair Jap Sega Saturn PSU?
Hi Folks,
I plugged my Japanese Sega Saturn into what I though was a step down convertor in to a UK power socket, only to be horribly shocked when I turned the thing on I have opened the case, and I can see a few components on the PSU that are damaged. These consist of: 1) A little green disc with legs, o5 220NA 53 is written on it, labeled VR1 on the board. This has cracked open. 2) A resistor with red, purple, yellow red colours on it, labeled R63 on the board. This may not be damaged, it might just be scorching from the little disc. 3) A fuse thats soldered onto the board, I can't really read the markings as I cant rotate the fuse, its a glass one and what I can see is V 1.6 - I presume this will be AC125V 1.6A which, is what the PSU expects to be plugged into. Sorry for my non-technical working, but its been years since I did any electronics! So - here are my questions! Can anyone confirm what the parts are? Does anyone think that anything else will be broken? Can anyone in the UK supply me with the parts to fix this, or can anyone reading this in the UK fix this for me? I have money/PayPal funds waiting. Thanks for the help in advance! Andrew McCall |
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"Andrew McCall" wrote in message oups.com... Hi Folks, I plugged my Japanese Sega Saturn into what I though was a step down convertor in to a UK power socket, only to be horribly shocked when I turned the thing on I have opened the case, and I can see a few components on the PSU that are damaged. These consist of: 1) A little green disc with legs, o5 220NA 53 is written on it, labeled VR1 on the board. This has cracked open. 2) A resistor with red, purple, yellow red colours on it, labeled R63 on the board. This may not be damaged, it might just be scorching from the little disc. 3) A fuse thats soldered onto the board, I can't really read the markings as I cant rotate the fuse, its a glass one and what I can see is V 1.6 - I presume this will be AC125V 1.6A which, is what the PSU expects to be plugged into. Sorry for my non-technical working, but its been years since I did any electronics! So - here are my questions! Can anyone confirm what the parts are? Does anyone think that anything else will be broken? Can anyone in the UK supply me with the parts to fix this, or can anyone reading this in the UK fix this for me? I have money/PayPal funds waiting. Thanks for the help in advance! Andrew McCall Hi Andrew, I have never worked on a Sega Saturn, but have seen other things that have been blown up in a similar way. Sometimes very little is blown other times lots! If you are lucky the green disc is connected across the mains supply, used to prevent mains surges from damaging the unit - in a similar way to the 'surge protector' mains sockets. These surges normally last microseconds during which time it absorbs the excess energy, something it can't do with a permanent 240V supply connected to it so quite rightly it explodes! Because this device is used to prevent surges it is non-essential therefore can be removed (start flame war) , and if luck is very much on your side the unit will work with just a new 1.6A fuse and VR1 removed from the circuit board.. The resistor is probably OK, its value sounds like 470K from your description, use a cotton bud lightly moistened with mehtalated sprits to clean it - if it looks perfect underneath the black soot it probably is OK. The other possibility for the green disc is that it is used to limit the switch on surge of the unit, if it does this job and has failed then there will be other devices faulty but probably nothing visible. The fuse should be easily obtainable from any stockist of electronic components (Maplin) look at the old one, usually it will be marked something like 1.6AT or 1.6T this denotes anti surge (which is normal for this kind of fuse) and is what you should be asking for. Don't worry about the voltage rating, this is the maximum voltage that the fuse can safely interrupt, any available here will be 250V but that will be perfectly fine. An even better option might be to buy a faulty but not dead (UK) Sega Saturn from Ebay and transplant the power supply unit complete - perhaps a Google on this subject will tell if this is likely to work. Of course this advice is given as is, with an assumption of electrical knowledge and regard for safety, if you are any way unsure please DONT DO IT! I will not be held responsible for any loss of life/limbs/major body organs/anything else.... Philip |
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"Electric dabbler" wrote in message ...
"Andrew McCall" wrote in message oups.com... Hi Folks, I plugged my Japanese Sega Saturn into what I though was a step down convertor in to a UK power socket, only to be horribly shocked when I turned the thing on I have opened the case, and I can see a few components on the PSU that are damaged. These consist of: 1) A little green disc with legs, o5 220NA 53 is written on it, labeled VR1 on the board. This has cracked open. 2) A resistor with red, purple, yellow red colours on it, labeled R63 on the board. This may not be damaged, it might just be scorching from the little disc. 3) A fuse thats soldered onto the board, I can't really read the markings as I cant rotate the fuse, its a glass one and what I can see is V 1.6 - I presume this will be AC125V 1.6A which, is what the PSU expects to be plugged into. Sorry for my non-technical working, but its been years since I did any electronics! So - here are my questions! Can anyone confirm what the parts are? Does anyone think that anything else will be broken? Can anyone in the UK supply me with the parts to fix this, or can anyone reading this in the UK fix this for me? I have money/PayPal funds waiting. Thanks for the help in advance! Andrew McCall Hi Andrew, I have never worked on a Sega Saturn, but have seen other things that have been blown up in a similar way. Sometimes very little is blown other times lots! If you are lucky the green disc is connected across the mains supply, used to prevent mains surges from damaging the unit - in a similar way to the 'surge protector' mains sockets. These surges normally last microseconds during which time it absorbs the excess energy, something it can't do with a permanent 240V supply connected to it so quite rightly it explodes! Because this device is used to prevent surges it is non-essential therefore can be removed (start flame war) , and if luck is very much on your side the unit will work with just a new 1.6A fuse and VR1 removed from the circuit board.. The resistor is probably OK, its value sounds like 470K from your description, use a cotton bud lightly moistened with mehtalated sprits to clean it - if it looks perfect underneath the black soot it probably is OK. The other possibility for the green disc is that it is used to limit the switch on surge of the unit, if it does this job and has failed then there will be other devices faulty but probably nothing visible. The fuse should be easily obtainable from any stockist of electronic components (Maplin) look at the old one, usually it will be marked something like 1.6AT or 1.6T this denotes anti surge (which is normal for this kind of fuse) and is what you should be asking for. Don't worry about the voltage rating, this is the maximum voltage that the fuse can safely interrupt, any available here will be 250V but that will be perfectly fine. An even better option might be to buy a faulty but not dead (UK) Sega Saturn from Ebay and transplant the power supply unit complete - perhaps a Google on this subject will tell if this is likely to work. Of course this advice is given as is, with an assumption of electrical knowledge and regard for safety, if you are any way unsure please DONT DO IT! I will not be held responsible for any loss of life/limbs/major body organs/anything else.... I have run a few tests, and it started out good, then went bad, and then went good again Basially, I already had a UK Sega Saturn, but it was a MK2 version. I took the PSU out and tried it in the Jap MK1 Saturn. The UK MK2 PSU is a slightly different shape, so it didn' fit in the case right, but when powered on the Saturn chimed to life! However... on further investigation I found that as soon as the CD started to spin up the Saturn crashed. I am presuming because the UK MK2 PSU gives slightly different power than the Jap one, or becuase the motherboard is also fried. So I was still worried all was lost at this point :-/ I ended up buying another Jap MK1 Sega Saturn, which I tested the new working Jap MK1 PSU in the broken Saturn - and it does indeed all work! I have bought a cheap MK1 UK Sega Saturn, which I will test the PSU in the Kap MK1 Sega Saturn - if this works I will just put label over the 110V on the back of the unit. If it doesn't, I am going to swap the fuse and VR1.... however - how can I find out what to replace VR1 with? Is there anyway I can identify this part? Thanks, Andrew McCall |
#4
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"Andrew McCall" wrote in message om... "Electric dabbler" wrote in message ... "Andrew McCall" wrote in message oups.com... Hi Folks, I plugged my Japanese Sega Saturn into what I though was a step down convertor in to a UK power socket, only to be horribly shocked when I turned the thing on I have opened the case, and I can see a few components on the PSU that are damaged. These consist of: 1) A little green disc with legs, o5 220NA 53 is written on it, labeled VR1 on the board. This has cracked open. 2) A resistor with red, purple, yellow red colours on it, labeled R63 on the board. This may not be damaged, it might just be scorching from the little disc. 3) A fuse thats soldered onto the board, I can't really read the markings as I cant rotate the fuse, its a glass one and what I can see is V 1.6 - I presume this will be AC125V 1.6A which, is what the PSU expects to be plugged into. Sorry for my non-technical working, but its been years since I did any electronics! So - here are my questions! Can anyone confirm what the parts are? Does anyone think that anything else will be broken? Can anyone in the UK supply me with the parts to fix this, or can anyone reading this in the UK fix this for me? I have money/PayPal funds waiting. Thanks for the help in advance! Andrew McCall Hi Andrew, I have never worked on a Sega Saturn, but have seen other things that have been blown up in a similar way. Sometimes very little is blown other times lots! If you are lucky the green disc is connected across the mains supply, used to prevent mains surges from damaging the unit - in a similar way to the 'surge protector' mains sockets. These surges normally last microseconds during which time it absorbs the excess energy, something it can't do with a permanent 240V supply connected to it so quite rightly it explodes! Because this device is used to prevent surges it is non-essential therefore can be removed (start flame war) , and if luck is very much on your side the unit will work with just a new 1.6A fuse and VR1 removed from the circuit board.. The resistor is probably OK, its value sounds like 470K from your description, use a cotton bud lightly moistened with mehtalated sprits to clean it - if it looks perfect underneath the black soot it probably is OK. The other possibility for the green disc is that it is used to limit the switch on surge of the unit, if it does this job and has failed then there will be other devices faulty but probably nothing visible. The fuse should be easily obtainable from any stockist of electronic components (Maplin) look at the old one, usually it will be marked something like 1.6AT or 1.6T this denotes anti surge (which is normal for this kind of fuse) and is what you should be asking for. Don't worry about the voltage rating, this is the maximum voltage that the fuse can safely interrupt, any available here will be 250V but that will be perfectly fine. An even better option might be to buy a faulty but not dead (UK) Sega Saturn from Ebay and transplant the power supply unit complete - perhaps a on this subject will tell if this is likely to work. Of course this advice is given as is, with an assumption of electrical knowledge and regard for safety, if you are any way unsure please DONT DO IT! I will not be held responsible for any loss of life/limbs/major body organs/anything else.... I have run a few tests, and it started out good, then went bad, and then went good again Basially, I already had a UK Sega Saturn, but it was a MK2 version. I took the PSU out and tried it in the Jap MK1 Saturn. The UK MK2 PSU is a slightly different shape, so it didn' fit in the case right, but when powered on the Saturn chimed to life! However... on further investigation I found that as soon as the CD started to spin up the Saturn crashed. I am presuming because the UK MK2 PSU gives slightly different power than the Jap one, or becuase the motherboard is also fried. So I was still worried all was lost at this point :-/ I ended up buying another Jap MK1 Sega Saturn, which I tested the new working Jap MK1 PSU in the broken Saturn - and it does indeed all work! I have bought a cheap MK1 UK Sega Saturn, which I will test the PSU in the Kap MK1 Sega Saturn - if this works I will just put label over the 110V on the back of the unit. If it doesn't, I am going to swap the fuse and VR1.... however - how can I find out what to replace VR1 with? Is there anyway I can identify this part? Thanks, Andrew McCall Hi Andrew, As I said in my previous post, you might not need to, VR1 is either just to protect against mains spikes (so you can live whithout it). If it were me I would remove VR1, replace the fuse and switch on. If VR1 is to protect against spikes and is the only thing fried then the unit will work. If VR1 has a differnt role then it won't work but I would put money on other components being faulty in a less obvious way. if you can take a good digital photo of both sides of the circuit board and email it to me - I might be able to say more. (email is spam-trapped - multiply the number in the address by 2) Philip |
#5
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Electric dabbler wrote: "Andrew McCall" wrote in message om... "Electric dabbler" wrote in message ... "Andrew McCall" wrote in message egroups.com... Hi Folks, I plugged my Japanese Sega Saturn into what I though was a step down convertor in to a UK power socket, only to be horribly shocked when I turned the thing on I have opened the case, and I can see a few components on the PSU that are damaged. These consist of: 1) A little green disc with legs, o5 220NA 53 is written on it, labeled VR1 on the board. This has cracked open. 2) A resistor with red, purple, yellow red colours on it, labeled R63 on the board. This may not be damaged, it might just be scorching from the little disc. 3) A fuse thats soldered onto the board, I can't really read the markings as I cant rotate the fuse, its a glass one and what I can see is V 1.6 - I presume this will be AC125V 1.6A which, is what the PSU expects to be plugged into. Sorry for my non-technical working, but its been years since I did any electronics! So - here are my questions! Can anyone confirm what the parts are? Does anyone think that anything else will be broken? Can anyone in the UK supply me with the parts to fix this, or can anyone reading this in the UK fix this for me? I have money/PayPal funds waiting. Thanks for the help in advance! Andrew McCall Hi Andrew, I have never worked on a Sega Saturn, but have seen other things that have been blown up in a similar way. Sometimes very little is blown other times lots! If you are lucky the green disc is connected across the mains supply, used to prevent mains surges from damaging the unit - in a similar way to the 'surge protector' mains sockets. These surges normally last microseconds during which time it absorbs the excess energy, something it can't do with a permanent 240V supply connected to it so quite rightly it explodes! Because this device is used to prevent surges it is non-essential therefore can be removed (start flame war) , and if luck is very much on your side the unit will work with just a new 1.6A fuse and VR1 removed from the circuit board.. The resistor is probably OK, its value sounds like 470K from your description, use a cotton bud lightly moistened with mehtalated sprits to snip Hi... Probably makes little difference, but sounds like closer to 270k to me Ken |
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