YvanJal

I've already checked the reset voltage from the power supply. It's stable at 4.87V which should be ok. Now I'm in the process of checking all Vcc to the all the IC's. I've checked IC21 and IC54 and everything is OK. I'm...

Thanks very much Agent 24, I finally got the service notes from this site. I'm sorry I didn't reply before to let you know I was able to download it. Now i'm in the process of troubleshooting the board like you suggested...

Thanks Agent24. I'm surprise getting an answer so fast ! I've replaced all the surface caps 10 microF on the board and tried to clean the corrosion but it still doesn't work. I'm starting to troubleshoot each IC to make...

I know this thread is very old but maybe someone will be able to help me. My KR-4500 doesn't show any lights on and no characters on the LCD screen, but the screen is on (lighted) green but completely blank. The CPU does...

Hi ! I also have to fix my KR-4500 motherboard. I replaced a lot of damaged surface mount caps but I'm afraid I accidentally induced a problem with the "Pitch Bend" that doesn't work anymore. If I could have the schemati...