casimirj wrote:
...I went ahead and tweaked the trimpots for quite a while to no avail.
That included the two on the module as well as the three on the main PCB?
casimirj wrote:
I should warn you, basically the only thing I did was change the chips, I have not reflowed the switch, nor done any other troubleshooting steps. I do still plan on it, but figured id post my results here for now.
Working through the inspection & reflow process on the module is highly recommended. You can skip the footwitch stuff, since it is apparently working fine (looks aren't everything!
).
You might also want to check some DC voltage levels with your multimeter. Here's the basic procedure:
To measure DC voltage levels, set your multimeter to the DC voltage mode, indicated by a solid line above a dotted one. Use the 20VDC range setting if it's not an auto-ranging meter. Your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to each point that you want to measure.
I would start by measuring the +9 and -9V pins on the left side of the module to insure that it is getting the voltage levels that it should (they will probably be closer to +8 and -8V.) If those are OK, check the voltages on the #4 and #8 pins of the two TL072 op amps. The pins are numbered per the left side of the image below. Keep in mind that some of the values should be
negative.
casimirj wrote:
You guys are ridiculously helpful and professional. Can offer your team some good beer from a local brewery?
It's certainly nice of you (and appreciated by us!) that you would make such an offer, but we forum moderators are scattered all over the place--Scott (sjaustin) and I are in upstate NY (but 200 miles apart!), and "the Boss", Keith (byoc) is in Washington state. So unless you want to split up a case and mail it all over the US, I think we should just accept your gracious words and leave it at that!
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