Service Manual / Repair instructions wanted

[selco]

Hallo all,
I still try to awake my C=A4000T again after a sudden, silent and unmotivated death. (Died without any reason while running)

So I am currently looking for repair instructions or a Service manual. I hope to find there instructions to locate the problem (wich signal should be measurable on wich pin, if not what to test then...)

Does anybody have such literature (in electronical form if possible) or can point me to a good link?

Best regards selco

[selco]

Hi X-ray,
I posted a detailed description of my problems in another thread:

http://www.amiga.org/forums/showthread.php?t=16667

There I also wrote what I could check so far.

Voltages are OK, all clocks that I could find are OK, the screen remains black, The Power-LED does -NOT- flash after power ON, The Early Startup menu cannot be accessed. The computer does -NOT- try to access a floppy disk.

This all happed without any reason.

All cards and harddisks have been removed, nothing changed.

Power connectors to the mainboard are ok. I exchanged the power supply but also no change.

So I ask for instructions how to locate the problem.

BTW: I had a Cyberstorm 060/50 in the system when it died. I replaced the Cyberstorm by the original CPU board of the C=A4000T (and checked for the correct jumper settings on the mainboard) but nothing changed!

So I assume the problem is on the motherboard.

I checked the ROMs and they are OK and sit perfectly in their sockets. (I read-out the ROM-images and checked their checksum manually)

As I said: I did nothing that could be reason for the problem. The Amiga was running in that configuration for ages about 16 hours per day (as apache server). It was running when it suddenly crashed (and never came up again) without beeing tuched! And there was no lightning then, neither...

So any instructions what clocks/voltages/signales I could check to locate the problem would be very welcome!