1024MAK wrote:The 7805 voltage regulator needs a heatsink in order for it to dissipate the heat it generates. If it does not have a suitable heatsink, it will shut down. However, running the QL like this risks damaging the 7805, as the sharp and rapid cool - heat cycle is not good for it.
Yep, the thing is that this QL came without a heatsink... Do you know where can I find one? Or could I build one with pieces?
1024MAK wrote:
As viewed in your picture, the left hand leg of the 7805 should be a DC voltage of at least 8.5V. The right hand leg should be between 4.75V and 5.25V. Both these voltages are respect to 0V which the centre leg and the heatsink tab on the 7805 are both connected.
I'll see if these volts are ok in this QL, but I think so as the computer boots, but not the OS. I heard once a serial of beeps
1024MAK wrote:
I assume that you are aware that the power input is a three pin connector and as well as 9V DC, the QL requires a AC line so that two further voltage regulators can generate +12V and -12V rails. These are mainly used by the serial ports, but IIRC one of them is also used for something else (could be a mod that was recommended).
OK,
1024MAK, I have no PSU for the QL so I had to build one for booting up at least. I thought that 12V were only used for microdrives, so I don't mind at the moment. I prefear now see if this QL works or not, I mean, if customs chips are dead or not.
1024MAK wrote:
Edit: there is some power supply information in this
thread. If you search you may well find more information.
Thanks,
1024MAK, first of all I'll check the voltage in the 7805
If something works... DON'T TOUCH IT!!! AT ALL!!!