Hi All
I have a GT64 Monitor (Green Screen) that won't Power the 464 that it comes with.
The Monitor Works well if I power the 464 from an external Power supply.
Are there any component that regularly go faulty for me to look at as a starting point.
Or any hints or Tests to cary out.
Thanks Ray
Hi All
The fault has been resolved.
It turned out to be a "Dirty" Potentiometer R501 which gave me about 2.7 Volts initially.
After cleaning the pot it is now set to 5.01 Volts.
Ray
Photos below
Hi All
Arggggggg I thought it was to easy ??
The + 5 Volt line sagged to about 2.74 Volts ( More Hair removed ).
BUT i remembered Bryce's comments a while ago about The Dreaded "" DRY JOINTS "" .
So an inspection of the Board indicated that 7 of the Diodes had " Annular " rings around the Pins.
So Soldered them back with " FRESH " Solder, also some of the Heavy interconnecting leads also had suspect solder joints.
I hope that this is the end of this Project.
If anybody can find where R511 120 Ohm 2 Watt is located on the mother board as i cannot find it ??
Ray
R511 is beside the fuses and the plug from the transformer, between the row of rectifier diodes and capacitors. It's not hard to miss, it's a pretty big resistor.
Bryce.
Hi Bryce
Thanks i will have an other look it appears to be not where the layout diagram indicates.
Oh well another look.
Thanks Ray
Now that you have the board out you can replace the caps and the thermal paste as well :)
@||C|-|E|| (http://www.cpcwiki.eu/forum/index.php?action=profile;u=1447)
Thanks I will have a look.
Ray