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starr36
Platinum Member
Canada
1172 Posts |
 Posted - 10/25/2006 : 09:32:32
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DOes anyone know how where the VERY SNUG fitting internal clips are on teh PSA 120T.
I have one that the cable broke RIGHT at the edge of the strain relief. I carefully slit the strain releif and I have BARELY enough wire exposed to solder the plug lead back on. I would like to get inside and do an invisible repair.
Was wondering if anyone knows the trick to get the PSA case open without destroying the Transformer inside. (I destroyed the older style adapter once by trying to carefully drill around the strain relief. punctured teh TF inside and ruined it.) |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/25/2006 : 17:29:36
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Hi Starr36
While I don't own a PSA-120T, I have seen the PSA-240 & it's like most other plug packs (wall warts)
The seams are ultrasonically welded together.
I have opened many plug packs, with varying success. I crack open a few every so often at work, to replace the dried out caps.
Maybe I am incorrect; You talk about internal clips.
I will wait to see if anyone else post a reply,
and to see if you are correct about there being internal clips.
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FRANZONI
Double Platinum Member
Ireland
3543 Posts |
Posted - 10/26/2006 : 23:43:55
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i did a job on one of mine a while ago..but i didn't have to split it open..... it had some rubber caps covering the holes for the screws,i just cut the cable shorter and joined it back together and all was good....are the european models different..?? the psa in question is about 5 to 6 years old..... |
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starr36
Platinum Member
Canada
1172 Posts |
Posted - 10/27/2006 : 02:42:44
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a picture is worth a thousand words.
i don't know how it is assembled; i just thought there were magic spots to push and tabs inside would release, like childlocks for kitchen cabinet doors.
You can see that if I put the wires back in teh strain relief they will be hidden right inside, that's because that how far back I had to go because the wires inside were broken that far back.
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Edited by - starr36 on 10/28/2006 04:19:25 |
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ptero
Silver Member
Mexico
218 Posts |
Posted - 02/16/2007 : 05:46:11
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| I'm having a similar problem with my psa. The screws came out but the case is still assembled. I don't know how to open it without destroying the case or internal components. Can anybody help with this?? |
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ptero
Silver Member
Mexico
218 Posts |
Posted - 02/16/2007 : 06:40:15
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Problem solved!!
No internal clips. All I had to do is to insert the screwdriver between the rubber of the cable and the plastic of the terminal blades side and push out the case.
Here some picture of the inside.
Download Attachment:  psa opened1.JPG
57.43 KB
Download Attachment: psa backcase.JPG
55.48 KB
This is the terminal blades side of the case
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ptero
Silver Member
Mexico
218 Posts |
Posted - 02/16/2007 : 06:48:04
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More photos...
Download Attachment: psa case.JPG
56.07 KB
This is the sticker side of the case
Download Attachment: psa transformer.JPG
49.64 KB
The transformer
I used a 4mm hex ratchet socket for the screws.
Tell me if you have a question about it before I assemble it back. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/16/2007 : 07:31:37
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Hi ptero
Is the 3 pin regulator a LM317T
or is it something else?
What is the voltage on the big cap.
If you are carefully, you can cut- slit one side of the cable restraint.
I use a surgical type scalpel or very sharp - new blade, hobby knife.
and pull the old broken bit of wore out.
Cut the clamp along the seam on the edge.
If you stuff it up, just get another clamp off an old supply.
Like an old mobile phone charger, or something.
Then reuse & slip, the clamp, over the new cable, I then use a small black cable tie to clamp the cable restraint back together. (maybe 2 ties)
That way you can fix it another time.
I hope this makes sense?
I do about 10 or more of these, a month, or similar type of repairs, to plug packs, that we use at work.
Regards Dr. Bob 
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ptero
Silver Member
Mexico
218 Posts |
Posted - 02/16/2007 : 07:47:59
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The 3 pin regulator is a KA7809, here is a pdf file:
http://www.datasheetcatalog.com/datasheets_pdf/K/A/7/8/KA7809.shtml
Big cap 1000uF, 35V
Small cap 22uF, 25V
Thanks for the advices, makes sense.
In the first photo you possibly can see the damaged cable near the restraint. It was a potential short circuit, both cables of the pair were exposed. I'm going to unsolder (desolder, the opposite of solder?), cut the damaged part of the cable, do that restraint surgery, solder again and assemble it again. |
Edited by - ptero on 02/16/2007 08:03:58 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/16/2007 : 08:00:56
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quote:
Originally posted by ptero
The 3 pin regulator is a KA7809, here is a pdf file:
http://www.datasheetcatalog.com/datasheets_pdf/K/A/7/8/KA7809.shtml
Big cap 1000uF, 35V
Small cap 22uF, 25V
Still reading your post
Hi ptero & Guys
The 7809 is a very common, positive 9V regulator.
it's known under a lot of different numbers
but the 7809 is always common to the letters & numbers.
Regards Dr. Bob |
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Topic |
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Splitting open a PSA 120T
