Alright guys, I apologize for the newbie like questions here, but here goes:
I am trying to repair the board of an APC Smart-UPS 1500 that I recently acquired.
Firstly, the largest capacitor on the board is a 40V 2700uF 3 pronged snap-in style capacitor, Jianghai brand CD298 series. I've read that this brand is somewhat dubious quality, so I would like to replace it with something higher quality. But, I've been unable to source a replacement 3 pronged snap-in capacitor of similar specifications, so I am wondering if there is any intrinsic reason that I would have to use a snap-in capacitor? It seems like something along the lines of a Nichicon HE capacitor would easily exceed the specifications of the existing capacitor (and be considerably smaller), but isn't available as a snap-in capacitor, let alone a 3 pronged version. So, is there any intrinsic reason that I must use a snap-in capacitor, are capacitors simply snap-in for mechanical stability reasons, if so, I could probably shore up any mechanical instabilities with a healthy amount of silicone-rubber?
Next, I am having a hell of a time finding information on some of the chips on the board. There are 4 smallish transistor looking devices on the board. They have 3 leads, maybe 3-4mm square in shape, they are branded ST, and have the following writing on them:
MRC
D5NE
10
30A402
I have typed every possible combination of these letters and numbers into google and searched the ST website using every combination as well, and I've turned up absolutely nothing on them. I'd love to get a datasheet on them, but if that is unavailable, just knowing what they do would be fine too. I would have posted a picture of them, but using my cheap Nikon Coolpix camera, I've been unable to get a clear picture of them, I think I would have to use a manual SLR with a macro lens to capture them accurately.
Any help or advice on either of these problems would as always be most welcome.
Thanks,
Justin
I am trying to repair the board of an APC Smart-UPS 1500 that I recently acquired.
Firstly, the largest capacitor on the board is a 40V 2700uF 3 pronged snap-in style capacitor, Jianghai brand CD298 series. I've read that this brand is somewhat dubious quality, so I would like to replace it with something higher quality. But, I've been unable to source a replacement 3 pronged snap-in capacitor of similar specifications, so I am wondering if there is any intrinsic reason that I would have to use a snap-in capacitor? It seems like something along the lines of a Nichicon HE capacitor would easily exceed the specifications of the existing capacitor (and be considerably smaller), but isn't available as a snap-in capacitor, let alone a 3 pronged version. So, is there any intrinsic reason that I must use a snap-in capacitor, are capacitors simply snap-in for mechanical stability reasons, if so, I could probably shore up any mechanical instabilities with a healthy amount of silicone-rubber?
Next, I am having a hell of a time finding information on some of the chips on the board. There are 4 smallish transistor looking devices on the board. They have 3 leads, maybe 3-4mm square in shape, they are branded ST, and have the following writing on them:
MRC
D5NE
10
30A402
I have typed every possible combination of these letters and numbers into google and searched the ST website using every combination as well, and I've turned up absolutely nothing on them. I'd love to get a datasheet on them, but if that is unavailable, just knowing what they do would be fine too. I would have posted a picture of them, but using my cheap Nikon Coolpix camera, I've been unable to get a clear picture of them, I think I would have to use a manual SLR with a macro lens to capture them accurately.
Any help or advice on either of these problems would as always be most welcome.
Thanks,
Justin
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