{"id":18544,"date":"2026-05-04T13:41:08","date_gmt":"2026-05-04T11:41:08","guid":{"rendered":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=18544"},"modified":"2026-05-04T13:52:59","modified_gmt":"2026-05-04T11:52:59","slug":"cdm-2-radial-servo-whining-loudly-in-cd-150","status":"publish","type":"post","link":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=18544","title":{"rendered":"CDM-2 Radial Servo Whining Loudly in CD 150"},"content":{"rendered":"

Spent a bit of time messing around with a defective CD 150 I received, one of whose servos is whining loudly. \u00a0The player has a CDM-2 and there are a lot of variants of that, and heard there were some challenges during production of the CDM-2’s<\/span><\/p>\n

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First checked the disc height; due to wear, the disc height drops because of a small indentation where the spindle rests.<\/p>\n

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measuring with a test CD and within +\/- 100 mV<\/p>\n

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If the player plays normally, the radial signal looks like this.<\/p>\n

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here in oscillation<\/span><\/p>\n

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then search in mountain CMD-2 service manuals<\/p>\n

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After reading the datasheet and other documents, I adjusted the resistor ( 3151 ) value on Pin 9 cLag. \u00a0A\u00a0lower value\u00a0<\/span><\/p>\n

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After a few attempts, it worked; no more oscillating radial servo. The eye looks neat too.<\/p>\n

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We are going to keep an eye on it for a while. <\/span><\/p>\n

Another problem is the wear of a small rubber stopper; it limits the minimum and maximum position of the swing arm. I suspect that if this small rubber stopper is missing, the swing arm moves too far towards the inside of the CD and sometimes just fails to find the TOC\/lead-in track.<\/span><\/p>\n

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\n","protected":false},"excerpt":{"rendered":"

Spent a bit of time messing around with a defective CD 150 I received, one of whose servos is whining loudly. \u00a0The player has a CDM-2 and there are a lot of variants of...<\/p>\n","protected":false},"author":1,"featured_media":18526,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[265,252,121],"tags":[],"class_list":["post-18544","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cd-150","category-cdm-2","category-philips"],"yoast_head":"\nCDM-2 Radial Servo Whining Loudly in CD 150 - Bram Jacobse<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=18544\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CDM-2 Radial Servo Whining Loudly in CD 150 - 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