2/22/2023 0 Comments Eventide h910 harmonizer manual![]() ![]() ![]() The board I worked on in the spring quickly turned into a hot mess until I finally benched it (I got it dirt cheap so it wasn’t much of a financial loss). When removing components, make sure your desoldering gun isn’t too hot or those pads and traces will come right off. The reason I failed the first time I worked on one of these is because the pads on the PCB are extremely brittle and come off easily. After replacing the chip, the unit works perfectly. I removed the chip, ran it through my digital IC tester and it failed. I started at the output of the DAC, moved my way back and found that one of the bits was distorted coming out of the 40174 latch IC but was crystal clear at the input. ![]() ![]() The pitch shifting “worked”, but it was heavily distorted. Side note, the Eventide Harmonizer employs two or three cards with a VCA compressor/expanded manufactured by DBX that’s not entirely dissimilar to the DBX 160. I replaced them all and the unit fired right up. I unplugged the top board from the unit and still found the continuity problem on the bottom board, so I checked the DBX cards and found a couple open tantalum capacitors. However, after replacing the caps, the 15v line was still hanging down and I was getting continuity between ground and 15v. This Harmonizer blew its fuse as soon as I turned it on I suspected there was a capacitor that shorted open in the power supply and I proved myself correct (I removed the three large caps and one of them had continuity between the leads). This was a redemption round for me as I had purchased a different H910 in the spring and failed to repair it. No, this isn’t a synth, but it is an amazing piece of digital processing gear that only the synth community can appreciate and sounds fantastic when used with synthesizers! ![]()
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