I have found that the voltage values are correct:
Input: 9V
Output: 5V
(Before and after freezing this shows same results).
checking the surface of the motherboard, I found these weird things:
Shows an icy surface, crystallized.
Also a kind of plastic sheath attached to the pin of the capacitor.
And finally, the "icy surface" is repeated around the power connector.
That's all for now... Any ideas?
EDIT: Could you see resistor over L4? WTF?
Thanks!
Some problems with Dragon 64
Re: Some problems with Dragon 64
I have already made some progress in the analysis of failure of the Dragon.
A friend left me his Dragon 32 to exchange components and the result is this:
After...
- Change of external transformer
- Change CPU
- Switching Multiplexer
- Changing rectification "daughterboard" (Being Dragon 32, the voltage of the video wasn't present [no video signal generated], but checking operation with cassette relay, writing "cload" and listening to the reaction)
None of these changes makes no hang.
A glance to the motherboard is not seen nothing damaged. Next step: change 5 electrolytic capacitors on motherboard? Replace quartz crystals?
Thanks in advance for your help.
Joe Morgan
A friend left me his Dragon 32 to exchange components and the result is this:
After...
- Change of external transformer
- Change CPU
- Switching Multiplexer
- Changing rectification "daughterboard" (Being Dragon 32, the voltage of the video wasn't present [no video signal generated], but checking operation with cassette relay, writing "cload" and listening to the reaction)
None of these changes makes no hang.
A glance to the motherboard is not seen nothing damaged. Next step: change 5 electrolytic capacitors on motherboard? Replace quartz crystals?
Thanks in advance for your help.
Joe Morgan
Re: Some problems with Dragon 64
Hi guys!
I changed 5 electrolytic capacitors ... nothing.
The damn thing fails in the same way.
You have any idea?
Thanks in advance, again!
I changed 5 electrolytic capacitors ... nothing.
The damn thing fails in the same way.
You have any idea?
Thanks in advance, again!
Re: Some problems with Dragon 64
I know it's a pain to desolder the 6847, but maybe you should desolder it, solder a socket in its place and swap it with a known working 6847.
Maybe the ram?
Maybe the ram?