Roland cube 80xl repair help needed

[hoferrossouw]

Im new on here i hope someone can help.

I have a roland cube 80xl amp, had it for years looked after it well and it never gave me a problem until recently.

If i turn the amp ons all the lights are ons ( weird because all the lights must mot be on simultaneously)

I have disassembled the amp, i have some electronic experience, soldering etc

I also have the schematic of the amp i just need to know where to start and what to look out for.

Please help!!

[Kevina]

No, or misshapen reset pulse on pin 80 of the CPU?

[nickb]

To get a better response your should post the schematic.

[vintagekiki]

https://usermanual.wiki/Collections/magnet/files/9365%20Audio%20Schematics%20and%20Service%20Manuals/Roland%20Cube%2080XL%20Schematics.pdf.html
^{Roland Cube 80XL}

[nickb]

It's possible the processor on not running. Check the 3.3V power, check it ha s a clock on pins 139 or 140 of the processor IC16. Also, as suggested above check the reset in working and clean on pin 81. You'll need a 'scope to do this.

[grant-robinson]

Hoferrosoous - did you find a solution to
this problem. I have exactly this problem with 80gxl.