View Full Version : Amstrad PPC external PSU S

August 9th, 2012, 01:17 PM
Hello. :)
Sorry for the changes to this post, I had problems with the browser. :(
I recently recovered an Amstrad PPC 640 without the external power supply, but fully functional.
I need the schematic diagram of the external power supply, I've searched on the web but without results.
Can anyone tell me where I can find it online?
Thanks for your patience. :sigh:

August 9th, 2012, 02:49 PM
The technical manual describes the power connectors: http://www.seasip.info/AmstradXT/ppctech/section1.html#1.20

August 9th, 2012, 03:21 PM
The technical manual describes the power connectors: http://www.seasip.info/AmstradXT/ppctech/section1.html#1.20

Thanks John, I know the site. Unfortunately lacks what it takes to me.
If anyone has this PSU and take a look inside, I would be very helpful...
From what I remember, is a very simple power supply:
a transformer, a diode bridge and a pair of capacitors.
What interests me are the values of these components.

August 9th, 2012, 04:09 PM
PPC 640 service manual here (http://maben.homeip.net/static/S100/amstrad/systems/PPC%20512/serv1/index.htm) This is one of two versions.

The second version is here (http://maben.homeip.net/static/S100/amstrad/systems/PPC%20512/serv2/index.htm)

There is a power supply schematic listed on page 26 on both manuals.

****Edit: I should have done a thorough look at those service manuals prior to posting the links. They include the chassis schematics but not the external power supply brick.

August 10th, 2012, 02:00 AM
Hello RJBJR.
Thanks, but I already know both sites. As I said, I have not found anything on the internet.
I am afraid that the only solution is to open the external power supply of the PPC and see how it's made.
Can you help me in this way?

August 10th, 2012, 02:43 AM
I have an Amstrad PPC 640 power supply, and after rmoving the four screws found that it still does not open, as it has been glued shut.

Was there a point to knowing the internal content, or just curiosity? Knowing the voltage required and the tpe of barrel connector, surely a replacement can be sourced?


August 10th, 2012, 05:41 AM
Thanks Paul.
I want to recycle the power supply brick of an HP printer, but to do this I need some information, such as (eg.) the value of the capacitors used in the external PSU of the PPC (to have the right filtering), and the output voltage with no load (Vdc).
Only in this way. I can get the exact value of the output voltage (AC) and make the appropriate changes to my power supply.

If I remember correctly the Amstrad PSU is not glued, but there is a large piece of tape between the transformer and the top cover. The top cover should come off without forcing it too much...

The photo below is just to give an idea of what I am doing. Here is the HP external power supply brick, ready to be modified and reassembled. :lol: A task done many times in the past... ;)


August 14th, 2012, 09:04 AM
I think I'm done. My PPC is working with the new power supply, and aesthetically does not appear too bad. Judge for yourself. :cool: