Author Topic: fixing the power switch.  (Read 6096 times)

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Offline arnoldemu

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fixing the power switch.
« on: 19:46, 23 October 10 »
If the CPC doesn't switch on and the power led doesn't light then it's likely to be the power switch.
This has been discussed before.

I've cleaned and replaced one, so now I can explain in more detail.

On CPC464 and CPC664 the power switch is screwed to the case. It also has a silver metal bracket on it.
First undo the screws and remove it from the case. (CPC464 and CPC664). For CPC6128 lift it out of the plastic bracket.
Disconnect it from the motherboard.
Now undo the screws to release the bracket (CPC464 and CPC664). You may find one screw is easy and the other is hard, so after first is removed, twist the switch and the other will release.

On the front of the switch there is a black plate which wraps around and clips on.
Gently prise the corners up using a flat head screwdriver. Then when you've done enough put the flathead screwdriver between it and the case and gently prise it some more. If you break this, then the switch is almost useless.

Once done, gently take it off and remove plastic switch part.

Inside there is a metal strip. Remove this careful and clean underneath it. You can sand it a little if the connections are dirty. One connection near the middle and a round one at the other end.

When you're done, fold some sandpaper and gently sand the two connectors inside the switch. Clean them with WD40 or similar too.
When you're happy, put the metal strip back in. Making sure it sits correctly (there are two notches in the metal strip, and these sit inside the middle connection bit.

Now hold the plastic switch bit in place so that it is in the off position.
Put the black metal plate think back on. Using needle nose pliers you can squeeze the sides so it starts to grip again.
Check the switch works and listen to it click.
Now put the bracket back on (cpc464 and cpc664).
Now fix back to the CPC case (cpc464 and cpc664) or put into it's plastic bracket (CPC6128).
Switch on CPC and see the power led come on. Lets hope that was all that was the problem ;)
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Offline Gryzor

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Re: fixing the power switch.
« Reply #1 on: 21:14, 23 October 10 »
Can I copy onto the wiki?

You didn't happen to take any pics, did you?
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Offline arnoldemu

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Re: fixing the power switch.
« Reply #2 on: 21:55, 23 October 10 »
Can I copy onto the wiki?

You didn't happen to take any pics, did you?
yes I did, but I haven't transferred them.
Yes you can copy it to the wiki.
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Offline Gryzor

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Re: fixing the power switch.
« Reply #3 on: 09:53, 24 October 10 »
Thanks, will do, if you can up the pics so I can incorporate them :)

I mean, even if you zip them all together and send them to me.
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Offline redbox

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Re: fixing the power switch.
« Reply #4 on: 14:49, 24 October 10 »
Haha, I replied in the other thread about this before I read this one.
 
My 6128+ powers up fine but randomly crashes, any ideas?  I think it might be a dry joint and will look for them, but I'm assuming after that it could be the RAM...?
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Offline arnoldemu

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Re: fixing the power switch.
« Reply #5 on: 16:09, 24 October 10 »
Haha, I replied in the other thread about this before I read this one.
 
My 6128+ powers up fine but randomly crashes, any ideas?  I think it might be a dry joint and will look for them, but I'm assuming after that it could be the RAM...?
Well the power switch is an easy think to take apart and clean. But if it was this then the computer would not switch on and no power led, or would be difficult to turn on.. I suppose crashes could happen if it was dodgy, but I am suspecting it's something else.

It could even be that the acid needs resoldering on your cart. Does it happen with any cart or just the basic one?

It definitely sounds like a bad joint you have there.
Sorry I can't help more.

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Offline Gryzor

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Re: fixing the power switch.
« Reply #6 on: 18:38, 24 October 10 »
I've had a 'dodgy' switch in the past, it never caused any crashes. It would just, you know, reboot very fast if you touched it. So I guess that indeed it'd be something else...
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Offline redbox

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Re: fixing the power switch.
« Reply #7 on: 20:13, 24 October 10 »
It could even be that the acid needs resoldering on your cart. Does it happen with any cart or just the basic one?

Will try another cart and see what happens, thanks for the pointer.

It definitely sounds like a bad joint you have there.

Yes I agree - will just have to take it apart and if anything looks dodgy, re-solder it (yikes!).
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Offline fano

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Re: fixing the power switch.
« Reply #8 on: 20:54, 24 October 10 »
My 6128+ powers up fine but randomly crashes, any ideas?  I think it might be a dry joint and will look for them, but I'm assuming after that it could be the RAM...?
I had the problem with my 6128+ too , power plug on 6128+ side is very fragile and was damaged.the problem stopped when i changed monitor with a good plug.I suspected that caused micro cut in power supply.
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Offline redbox

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Re: fixing the power switch.
« Reply #9 on: 22:59, 24 October 10 »
I had the problem with my 6128+ too , power plug on 6128+ side is very fragile and was damaged.the problem stopped when i changed monitor with a good plug.I suspected that caused micro cut in power supply.

I tried another cartridge and it does the same thing, artifacts on the screen and some other random things happening  :(

What do you mean about the power switch?  Is the only way to fix this to get another monitor as that supplies the power?  Or do I simply change the plug that goes into the power socket on the wall?
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Offline arnoldemu

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Re: fixing the power switch.
« Reply #10 on: 23:01, 24 October 10 »
I tried another cartridge and it does the same thing, artifacts on the screen and some other random things happening  :(

What do you mean about the power switch?  Is the only way to fix this to get another monitor as that supplies the power?  Or do I simply change the plug that goes into the power socket on the wall?
I think fano means the circular 5v power socket on the 6128 pcb.
You could try resoldering it into place, turning the pcb over and being careful to solder it.
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Offline fano

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Re: fixing the power switch.
« Reply #11 on: 08:25, 25 October 10 »
That's what i meant , thx kevin , sorry i forgot to say it is the 5V connector.
You may check the plug itself too.
« Last Edit: 08:46, 25 October 10 by fano »
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Offline redbox

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Re: fixing the power switch.
« Reply #12 on: 11:36, 25 October 10 »
That's great, thanks guys, will have a look.
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Offline Lux

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Re: fixing the power switch.
« Reply #13 on: 23:36, 20 April 12 »
This did for it me!
My dusty cpc464 has come alive thanks to your advice.
Thanks a lot!
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Offline Gryzor

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Re: fixing the power switch.
« Reply #14 on: 16:50, 03 May 12 »
Wo
This did for it me!
My dusty cpc464 has come alive thanks to your advice.
Thanks a lot!



Wow, at first I thought whoever started the thread only resolved the problem now, but... welcome, glad to be of help :)
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Offline Shredder11

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Re: fixing the power switch.
« Reply #15 on: 01:19, 14 April 15 »
Wow I am so glad I found this topic!  I was so down to find my CPC6128 dead as a door nail the other day,  but now it is back to its' best!  Also as a result of this,  I somehow got in the right frame of mind to figure out another problem I had with an external 3.5" floppy drive....and now that is working!  ;D




Thank you so much!
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Offline Vorian

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Re: fixing the power switch.
« Reply #16 on: 16:21, 24 August 17 »
Thank You, A simple fix for an apparent dead machine.

I applied this fix to a 6128 plus, I checked the switch beforehand by using the top cover (with my working switch from my 464 plus), the 6128 plus powered on so I then knew switch needed the TLC as described in OP.

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