i've got here a brazilian famiclone, unfortunately it's broken. i couldn't find any decent info on internet, hope i can succeed here... there's one resistance burned out, i hope someone could tell me here which kind it is. i thought it looked the same as the resistance at section Q1?
yes i know, that is why this question, have to be sure that the 2 stripes in the middle are really black and not black from the burnout
This burned resistor , along with the transistor and zener diode near it are the most simple parametric stabilizer. It generally faulty and unreliable, so i recommend to swap it with 5v linear stabilizer, like LM7805 or its analog.
Even better would be one of these: http://tinyurl.com/6vt6xqo I ordered a few just to try them out and I think I'm in love. No heat sink to worry about and it's an exact replacement for a 7805.
Question, when we replace it for the LM7805, is that resistance then not required. We have no color code it doesn't show how many Ohms this part has. I do not think it is possible without this component, have no idiea to what points it to solder the stabilizer. Is there a outlining overview?
Show us the bottom of the PCB. If you install LM7805 or its analog, none of above mentioned components (transistor, zener diode etc.) are needed anymore.
