{"id":4969,"date":"2019-01-27T21:44:41","date_gmt":"2019-01-27T20:44:41","guid":{"rendered":"https:\/\/www.untergeek.de\/?p=4969"},"modified":"2019-02-03T12:21:55","modified_gmt":"2019-02-03T11:21:55","slug":"waldorf-blofeld-pitchbend-calibration-not-needed","status":"publish","type":"post","link":"https:\/\/www.untergeek.de\/de\/2019\/01\/waldorf-blofeld-pitchbend-calibration-not-needed\/","title":{"rendered":"Don’t go looking for a blofeld calibration routine to fix the pitchbend wheel."},"content":{"rendered":"
<\/div>\n
\"Waldorf<\/figure>\n\n\n\n

One day, my trusty Blofeld started drifting out of tune – pretty unusual behaviour for a digital synth. Even if it was in tune first, the drifting started as soon as I touched the pitchbend wheel, so I suspected that this was the culprit. <\/p>\n\n\n\n

\"Blofeld<\/figure>\n\n\n\n

Opening the Blofeld (all 18 screws on the bottom – remember?), removing the wheelbox, and measuring the pitchbend pot confirmed that the potentiometer was indeed damaged – while an end-to-end-measurement showed 9k, the end-to-mid-resistance could be virtually anywhere, screaming „Mechanical Damage!“ to me. <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The potentiometer is 10k lin with a knurled 6.3mm shaft and an M10x0.75 mount. Waldorf seems to have used a Piher T-21Y type (datasheet<\/a>). As I did not find something fitting in my parts boxes, I took it apart, cleaned it, adjusted the pickup spring, applied a bit of contact grease<\/a>, refitted the pot and closed the Blofeld<\/p>\n\n\n\n

And now for the good part… <\/h2>\n\n\n\n

Although I measured that the wheel now zeroed around the pot’s 5kOhm mark, it had most definitely shifted slightly, so I started looking for the calibration routine. There has to be a calibration routine, right? <\/p>\n\n\n\n

But the good Blofeld seems to calibrate on power-up and on the first usage of the wheel – no calibration routine for the wheels needed. Phew!
<\/p>\n\n\n\n

\"Waldorf<\/figure>\n\n\n\n

Important note:<\/strong> Be careful to ensure that the Molex connector for the wheelbox sits correctly – when I pulled the plug, the plastic holder for the pins got pulled towards the edge of the PCB so when I reattached the plug, it did not sit correctly. Rule of thumb: If the plastic of the connector is visible from the top, you might want to push it back under the PCB. <\/p>\n","protected":false},"excerpt":{"rendered":"

One day, my trusty Blofeld started drifting out of tune – pretty unusual behaviour for a digital synth. 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Even if it was in tune first, the drifting started as soon as I touched the pitchbend wheel, so I suspected that … Weiterlesen →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.untergeek.de\/de\/2019\/01\/waldorf-blofeld-pitchbend-calibration-not-needed\/\" \/>\n<meta property=\"og:site_name\" content=\"untergeek\" \/>\n<meta property=\"article:published_time\" content=\"2019-01-27T20:44:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-02-03T11:21:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.untergeek.de\/wp-content\/uploads\/2019\/01\/787fd402-1cc8-46a3-9a86-d964e8a23f91-3515-000001c5b09d1c15_file-e1548614718445.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"3558\" \/>\n\t<meta property=\"og:image:height\" content=\"2499\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"untergeek\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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