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My Schneider CPC 464 don't work.

Started by twox, 15:07, 23 February 14

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Bryce

#25
Hi twox,
       sorry, must have missed your last post. Anyway. Can you post a picture of what's on the monitor screen when the computer is turned on (if it is now different)? The PCB looks to be generally in a bad way, so it's most likely just dirt on the sockets / switches that's causing the problems.  I doubt the ULA is broken. The Service manual is unfortunately a "part replacement guide" rather than a guide for actually fixing the electronics as we do today.

If you can't get any further with this, you can send me the PCB and power switch and I will fix it for you (I am in Germany so postage shouldn't be too much).

Bryce.

twox

No, the image on screen does not changed. But, sometimes it shows things, that can be resembled as characters (unfortunately i dont have photo of this) and they are very angular and they dont represent any actual words. Can you explain what is ULA? I may try to repair it myself.
And, monitor seems to minimally decreased screen refresh rate, but i think this will change back when i will repair my CPC completely (i must say that monitor was 100% fine before that). Thanks you for the offer of repair, but most likely i will dont use it. Cheers

Bryce

The ULA is usually referred to as the Gate Array. It's one of the 40pin chips on the PCB and it will be marked 40007 or 40010 depending on the revision of the board you have.

Bryce.

Edit: Just checked your pictures, yours is a 40010 (socketed IC at the bottom right of the PCB).

twox

#28
I will get it of its place and clean its socket, and mount it again. If this would not work, i will replace it.
EDIT: Btw, does the DEL key pressed make sound when ULA is broken?

TFM

Depends, if the broken ULA crashes the system.
TFM of FutureSoft
Also visit the CPC and Plus users favorite OS: FutureOS - The Revolution on CPC6128 and 6128Plus

twox

Looks like it does, because no startup message it shown.

TFM

Since your ULA is on a socket, you can try to replace it.
TFM of FutureSoft
Also visit the CPC and Plus users favorite OS: FutureOS - The Revolution on CPC6128 and 6128Plus

twox

#32
I may try firstly to get it of its place and mount it again because i thinked that the circuit right next to ULA  is ULA.(lol)
EDIT:
ARGH! I needed to glue my nail with sticky tape to my finger 4 times, because simply i cannot get ULA of it's socket. Can someone give me a method to do this without harming myself (and Amstrad)?

twox

#33
bump.
EDIT: I did get it  of socket myself with screwdriver, but ULA seems to be really not working, because i got it of it's socket, cleaned the socket and pins (three of them got a little curves but i repaired it) of ULA and pushed it back to it's place, without effect.
Can someone give me a good place to buy ULA? Because i don't want to spend 19,99 GBPto buy a chip, because it's too expensive (with payment on pickup please).

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