DIY Stompboxes => Digital & DSP => Topic started by: on September 07, 2019, 01:40:33 AM

Title: Help with boss hr2 Harmonist erratic voltage guitar pedal on an ic
Post by: on September 07, 2019, 01:40:33 AM
Hello, in advance I thank people who can help or provide any comments that can help me.

The question is this, I have a boss hr2 Harmonist guitar pedal. the pedal turns on, but it sounds like a very unpleasant and inaudible oscillation, I have checked the voltages as the diagram indicates and everything is correct except for the voltages in an ic (which by the way I cannot find to replace in case it is damaged this one) I attached the diagram and the voltages on the pins that I find with erratic voltage.

The problem is in IC8 and IC9 the pins of the IC8 with erratic voltage are pin 10, 13 and 15 presents an erratic reading that varies from 2.4 to 4 vol. but quickly, I also notice that the ic5 gets quite hot but I measured it and it is in good condition in the same way the ic9 on pins 13 and 15 its voltage is erratic

Any idea that I could be giving these problems? And if anyone thinks it is possible that the ic8 has to be replaced, where could he get that ic or some replacement?
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