Author Topic: CPC 464 - Will not boot  (Read 717 times)

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Offline antpant7

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CPC 464 - Will not boot
« on: 19:27, 07 June 20 »
Hello, I have recently purchased a CPC 464 from Ebay. When I turn on the 464 I am getting a pink garbled screen with low volume noise from the speaker.



Pressing the DEL doesn't produce a Beep.


I have am using a 5v 3amp power supply (3rd party).
The board revision is MC0044d


Hoping someone may have experienced the same thing and found a solution.


Thanks.


Antony Myers.
« Last Edit: 19:45, 07 June 20 by antpant7 »

Offline Bryce

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Re: CPC 464 - Will not boot
« Reply #1 on: 21:18, 07 June 20 »
Hi and welcome to the forum,

You've defintely got a 464 with a failed RAM chip. You need to find out which chip has failed and swap it out. If that's beyond your ability, then let us know.

Bryce.

Offline antpant7

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Re: CPC 464 - Will not boot
« Reply #2 on: 14:47, 08 June 20 »
Hello Bryce, thanks for the warm welcome to the group.


I have piggy backed some km4164b ram that I had spare from repairing a C64.


Managed to get the CPC464 to boot, i will now solder in an IC Socket and replace the km4164


Thanks a million for your quick and accurate diagnostic  ;)


Next job for me is to strip down the tape unit and give it a good clean and re-grease .


Will post a pic of the finished results when its done !!




Offline Bryce

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Re: CPC 464 - Will not boot
« Reply #3 on: 14:50, 08 June 20 »
Congrats. That was a quick repair, but if you've already swapped RAM on a C64, then you probably know what you're doing (we won't talk about the fact that the C64 got fixed first or your retro computer tastes  :) ).

Bryce.