My 106 was probably sitting for about 20 years, however it worked before I stored it. so I went through the normal overall: new chips, new filters and some other things. I checked all of the pre-volts checks on the board and they looked good. Had a horrible time calibrating. Thought it may had been my old pots so I replaced all of the pots to set calibration. I’ve made all of my setting for the correct banks as described in Rolands service notes before attempting settings. Some chips will adjust white others peak to peak volts go up and down like a roller coaster on the oscillopscope without being able to set to 4.8 volt or 6volt when required. I beginning to think it’s my new chips from Borish electronics which gets a high review on their AR80017A voice chips. one of the chips has a big fat wave unlike the others that are crisp and sharp. any recommendations on what I may be missing or need to consider?
If it wasn’t turned on for 20 years then you could have some bad electrolytic caps on the voice board. With regular use they tend to reform and last longer but when they go unused for a long time they have a higher chance of drying out. Look at them closely and see if any look expanded or like they’ve leaked for the voices that dont act right. Sometimes they look fine but aren’t so you may have to go around and desolder one leg from each and measure the capacitance and resistance of the component to make sure it’s healthy. Resistance should start around 0 then increase to OL or infinite. Capacitance should be the value printed on the capacitor.
Thanks Travis I will take a good look at those. I also need to double check all of my solders to the new chips.