Amiga 3000 acting up resistor

[rkidd7952]

One other thing to mention is to check the value of the resistor used to replace the burnt one.  R403 and R404 should be 10 ohms based on the Commodore schematics (A3000_19a.png in the A3000 service manual from http://www.devili.iki.fi/mirrors/4x4.hopto.org/).  The vector schematics from amigawiki (http://www.amigawiki.org/dnl/schematics/A3000.pdf) list those resistors as 1 ohm.

Robert

[rkidd7952]

I would go with the 10 ohm value from the Commodore schematic.  Both R403 and R404 have the same value.

From the seven resistors in a row, where #3 is the burnt one, it looks like #4 is a 10 ohm in series with a 2.7k (#6), which match the values of R403 and R407, respectively.  That makes the burnt one R404, which should be 10 ohms to match R403.

Robert