4/27/2023 0 Comments Mes boogie schematicsBut it isn t indiference to the customer. i notice there is a trim pot on the board would it have anything to do with the heat or is it just for biasing the transistors.is it possible that the 10k resistor is an isolation resistor?wondering if mesa did any upgrades possibly a 5w 15k resistor or something larger.possibly a design flaw.where to go from here.any Īs a professional repair guy, I don't like that policy any more than you do. the amp was taken apart again and the 10 k resistor was replaced with an exact replacement 10k 3.75w wirewound.everything checks out component wise ,but the resistor get hot 300 degrees plus when checked with a infared temperature also has 90v+ on one leg and -89.7v on the opposite leg. the amp sounded good at the sound check then had noise and lower power so it was replaced with a different amp for the rest of the night. i replaced the transitor only as i didn't have a resistor at the same time i replaced the transitor.the resistor still checked good at 10k.the amp worked for a bit.then was hooked up to a single extention chord with the rest of an entire bands equipment.i guess a couple of other elcectronic items the band was using had problems also. someone previous to me must have gave it the push test and broke a couple of legs. Heres one for the pros!!!i replaced the 3.75w 10 k resistor on the output was getting hot due to a transistor having broken legs.
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