@Amiwin:
If you have the DCE built scan-doubler, I know why it overheats.
I have the external model and it uses 3 by 12-5V regulators to power the electronics. When you drop from 12-5V using a linear power regulator, the unwanted volts get lost as heat. On the DCE boards, the regulators use the PCB as the heatsink. The Whole PCB would just be enough for the regulator that powers the fiels and line buffers but there are 2 more converters!
As a result, the PCB heats up, components around and in the case heat up. I measured an ambient temperature of 55C on my scandoubler before I added a fan. Once done, my screen bleeding problems disappeared. These scandoublers also dump a large amount of 15 KHz noise on the 5V power bus due to inadequate decoupling!
Bye,
Ian
