The Sinclair QL Forum

Ah! So just solder a wire link from 1 to 3 on the regulator on the qubide? I think I can manage that It's strange because it works fine for a bit then just locks up. Many thanks!

Can I solder the wire to the bottom of the board rather than the top?

Pete,
probably the best method would be to remove the regulator completely and solder a thee-pin (female) pin header instead. Then you could easily change between the wire link and the original 7805.

Tobias

That sounds like a good plan Just as a temporary test I'll try the wire first

A 7805 regulator when fed with 5V at it's input will drop about 2V which results in the output being about 3V. Some chips will just about work at this voltage. my guess is that sooner or later a signal will not go high enough and will not be seen as a logic high. The system will then crash...

Mark

I managed it and the card is detected and works fine but the display flashes on and off. To a black screen then back to the desktop then back to off again. I could still type etc but it was flashing on and off so I quickly turned it off!

It's flashed off once or twice with the qubide removed I hope it's not zapped something. I've turned back on again after checking all the connections and it seems ok at the moment.

Well it's not gone off once since I turned it back on *fingers crossed* On a side note I took a picture of the solder job and this was before I tested it. Does the pin at the very top left look dodgy?



http://www.zen70509.zen.co.uk/ql/wire2.jpg

vanpeebles wrote:Well it's not gone off once since I turned it back on *fingers crossed* On a side note I took a picture of the solder job and this was before I tested it. Does the pin at the very top left look dodgy?

Maybe, could do with a better picture (using macro mode).

While on about quality soldering, the normal sensible way to add a wire to the track side of a PCB is to use solid core wire (e.g. single core 0.6mm copper 22AWG). Always use proper wire strippers, as stripping using wire cutters leaves a nick in the wire, causing it to fracture and break at that point (either sooner or later).

Also use some small round noise pliers to form the stripped end of the solid core wire into a hook or circle that you place over the component leg

I hope that helps a little

Mark

Hi,

It looks like you have shorted the 5v to the Ground Plane.

I would use smaller core wire for the jumper.

Strange I always thought the jumpers on the Qubide by-passed the voltage regulator. Maybe this is different n the clone... I will have a look on mine. As I was thinking about putting QL into a Black Tower Case that I have spare.

There is definitely nothing touching anything else apart from the two outer pins but I'll see if I can find some smaller wire.