{"id":2216,"date":"2025-05-03T22:17:06","date_gmt":"2025-05-03T22:17:06","guid":{"rendered":"https:\/\/storycase.co.uk\/radio\/?p=2216"},"modified":"2025-06-24T20:47:25","modified_gmt":"2025-06-24T20:47:25","slug":"beogram-cd-3300-capacitor-fault","status":"publish","type":"post","link":"https:\/\/storycase.co.uk\/radio\/bang-olufsen\/beogram-cd-3300-capacitor-fault\/","title":{"rendered":"Beogram CD 3300 capacitor fault"},"content":{"rendered":"\n<p>Has your Beogram CD 3300 stopped playing discs? Maybe it starts running for a few seconds and then displays a red question mark instead of a track number? Is so, it could be easy to repair.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Warning: Disconnect mains power before attempting to access the internal circuitry. Dangerous voltages are exposed laser radiation can cause injury if the unit is powered with the case removed.<\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"754\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-1024x754.jpg\" alt=\"\" class=\"wp-image-2238\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-1024x754.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-300x221.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-768x565.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-1536x1131.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-2048x1507.jpg 2048w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-600x442.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-logo-945x696.jpg 945w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p>There are several common faults that affect the Philips CDM mechanisms Bang and Olufsen used inside their 80s CD players. I covered one such fault in&nbsp;<a href=\"https:\/\/storycase.co.uk\/radio\/bang-olufsen\/beocenter-9000-cd-fault\/\">BeoCenter 9000 CD Fault<\/a>.<\/p>\n\n\n\n<p>This post shows you where the suspect capacitor is located and how to replace the component with minimum effort. I&#8217;ll assume you have cleaned the lens, tried several CDs and the fault persists so the fault is most likely due to this usual suspect!<\/p>\n\n\n\n<p>You will need a small Torx driver bit to remove the fixings along with a soldering iron, solder sucker or copper braid and small flat bladed screw driver.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Suspect capacitor<\/h2>\n\n\n\n<p>The CDM-2\/10 drive and servo board manufactured by Philips uses their blue axial electrolytic capacitors that are prone to failure after 30 plus years. Many aluminium electrolytic capacitors suffer from electrolyte leakage, causing them to dry out and suffer from high series resistance. This 33\u00b5F device seems susceptible to failure and may be due to the higher pulse currents it&#8217;s subjected to in operation. <\/p>\n\n\n\n<p>The Philips original I removed had a high ESR of over 4\u03a9 &nbsp;which was causing the laser drive fault, even though its capacitance measured a healthy 40\u00b5F. There is no evidence of leakage under the PCB where it was mounted. The high Vloss of 9% is another clue the capacitor has aged.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"890\" height=\"1024\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-890x1024.jpg\" alt=\"Capacitor measurement reading ESR 4.1 \u03a9 and value 39.1 \u00b5F\" class=\"wp-image-2222\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-890x1024.jpg 890w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-261x300.jpg 261w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-768x883.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-1335x1536.jpg 1335w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-1781x2048.jpg 1781w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-600x690.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Faulty-cap-ESR-945x1087.jpg 945w\" sizes=\"auto, (max-width: 890px) 100vw, 890px\" \/><figcaption class=\"wp-element-caption\">Faulty capacitor ESR reading<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Servo Board Access<\/h2>\n\n\n\n<p>Access to the CDM servo board, where the suspect capacitor is located, first requires removal of the multiple screws from the base. There&#8217;s no need to undo the rear fixing which holds a cover in place.<\/p>\n\n\n\n<p>With the base removed, you can see the CD servo board below the mains transformer as indicated below. I found it possible to remove the suspect electrolytic without taking the CDM-2\/10 apart. To do this I unscrewed the PCB&#8217;s 4 Torx fixings and gently levered the three plugs, shown in the photo, to pull them free. Be very careful not to damage the ribbon cable opposite the plugs on the servo board. With the grey cables clear you can tilt the PCB to see the blue axial capacitor and locate the top connections to unsolder. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-1024x576.jpg\" alt=\"Internal PCB layout showing position of the CD servo board below the mains transformer.\" class=\"wp-image-2223\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-1024x576.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-300x169.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-768x432.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-1536x864.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-2048x1152.jpg 2048w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-600x338.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Internal-PCBs-945x532.jpg 945w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Beogram CD 3300 Internal PCB layout <\/figcaption><\/figure>\n\n\n\n<p>I marked each connection with a dot from a felt tip and replaced one fixing to anchor the board while I unsoldered the capacitor. This avoids any strain on the ribbon cable. The capacitor leads were bent over on my PCB, so once the solder was removed I used a small flat screwdriver to gently lift each lead to make it easy to pull free. Take care not to damage the copper pads so apply soldering iron to heat the lead as you lift each wire.<\/p>\n\n\n\n<p>Why not remove the ribbon cable and free the board to work on? Well that requires removal of the upper PCB assembly to access and remove 4 circlips  that hold the CDM in place. A bit like removing the engine to change a spark plug&#8230; <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Replacement capacitor<\/h2>\n\n\n\n<p>Replacement 33\u00b5F 16 or 25v electrolytic capacitors are readily available but finding one with axial leads can be more difficult. A radial lead replacement are more common and can be fitted if you can&#8217;t locate an axial part. You may read other forums suggesting low ESR capacitors are not suitable but I&#8217;ve found one with an ESR of 0.5 &#8211; 0.8\u03a9 works well.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"792\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-1024x792.jpg\" alt=\"\" class=\"wp-image-2226\" style=\"width:490px;height:auto\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-1024x792.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-300x232.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-768x594.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-1536x1188.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-600x464.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial-945x731.jpg 945w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-radial.jpg 1842w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Replacement radial capacitor<\/figcaption><\/figure>\n<\/div>\n\n\n<p>I selected a radial electrolytic with a height similar to others fitted so it cleared lower plate as shown.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-1024x576.jpg\" alt=\"\" class=\"wp-image-2227\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-1024x576.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-300x169.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-768x432.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-1536x864.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-2048x1152.jpg 2048w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-600x338.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/New-cap-fitted-a-945x532.jpg 945w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Replacement capacitor fitted<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Capacitor kits<\/h2>\n\n\n\n<p>You may see capacitor kits available containing all the servo board electrolytics, with recommendations to replace every cap. I prefer to check the values first as it may be unnecessary and too easy to damage the PCB copper tracks when removing the old devices. Some PCBs have very thin copper pads that separate from the board when the connection is unsoldered so minimal heat and disturbance is best.<\/p>\n\n\n\n<p>I measured the remaining servo board  electrolytic capacitors, two 220\u00b5F and two 47\u00b5F &#8211; radial types &#8211; and all were within spec, so I left these in place.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DAC board<\/h2>\n\n\n\n<p>The digital to analogue board, which uses the acclaimed 16 bit TDA1541, also uses several blue Philips axial capacitors along with the usual black radial types. It&#8217;s tempting to replace all the blue ones, just in case, given the servo board failure. I checked the values and again all were well within specification so I left them in place so I can monitor.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-1024x576.jpg\" alt=\"\" class=\"wp-image-2221\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-1024x576.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-300x169.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-768x432.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-1536x864.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-2048x1152.jpg 2048w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-600x338.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-board-945x532.jpg 945w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">DAC board<\/figcaption><\/figure>\n\n\n\n<p>&nbsp;If I was servicing the Beogram for a client I would probably replace all the blue axial capacitors due to reliability concerns and reduce risk of further problems. Replacements don&#8217;t have to be axial &#8211; as you can see higher radials are also fitted as standard. Most of the blue capacitors are used for DC decoupling so don&#8217;t require an audio rating so it&#8217;s curious why B&amp;O chose the Philips parts. (The black and grey cased radials are not Philips components as far as I can see.)<\/p>\n\n\n\n<p>If you do replace the blue axials with radial types be carful with bending the wires close to the PCB as there&#8217;s a bare copper screen top side as shown above.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Audio rated capacitors<\/h2>\n\n\n\n<p>The Philips blue can series were very popular in the seventies and eighties and used in many audio applications. Along with their C280 &#8216;tropical fish&#8217; polyester capacitors they found their way into many hifi audio amplifiers. I made frequent use of them. <\/p>\n\n\n\n<p>Audio quality components should be sought for all electrolytic capacitors in an audio signal path such as the 100\u00b5F DC blocking capacitors  C2366 and C2367, rather than basic low ESR DC decoupling types. <\/p>\n\n\n\n<p>Note in my Beogram neither C2366 or C2367 appeared to be bipolar types although the circuit below shows the LM833 op amps have +\/- 15v supplies suggesting the capacitor&#8217;s positive terminal can swing negative which is not good for a standard polarised electrolytic. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"733\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-1024x733.png\" alt=\"Schematic showing 100uF electrolytic capacitors in the L &amp; R channel audio path\" class=\"wp-image-2233\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-1024x733.png 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-300x215.png 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-768x549.png 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-1536x1099.png 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-600x429.png 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps-945x676.png 945w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Beogram-CD-3300-DAC-Op-amps.png 1560w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">DAC board schematic<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"718\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-1024x718.jpg\" alt=\"Shows LM833 and associated audio components\" class=\"wp-image-2234\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-1024x718.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-300x210.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-768x538.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-1536x1077.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-2048x1436.jpg 2048w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-600x421.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/DAC-Board-Op-amps-945x662.jpg 945w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">LM833 and associated audio components (C2366 or C2367 top right)<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Listening tests<\/h2>\n\n\n\n<p>With the suspect capacitor replaced the Beogram plays CDs again without any problems. Sound quality via its matching Beomaster 3300 paired to the newly refurbished CX100s is very good.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"660\" src=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-1024x660.jpg\" alt=\"\" class=\"wp-image-2240\" srcset=\"https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-1024x660.jpg 1024w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-300x193.jpg 300w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-768x495.jpg 768w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-1536x991.jpg 1536w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-2048x1321.jpg 2048w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-600x387.jpg 600w, https:\/\/storycase.co.uk\/radio\/wp-content\/uploads\/2025\/05\/Play-fixed-945x609.jpg 945w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Beogram CD 3300 Playing again<\/figcaption><\/figure>\n\n\n\n<p>I will take another look at the question of bipolar audio coupling capacitors in another post. Meanwhile if any readers have thoughts on this please leave a comment.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Has your Beogram CD 3300 stopped playing discs? Maybe it starts running for a few seconds and then displays a red question mark instead of a track number? Is so, it could be easy to repair. Warning: Disconnect mains power&#8230; <a class=\"more-link\" href=\"https:\/\/storycase.co.uk\/radio\/bang-olufsen\/beogram-cd-3300-capacitor-fault\/\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":164,"featured_media":2239,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,38],"tags":[],"class_list":["post-2216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bang-olufsen","category-common-faults"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Beogram CD 3300 capacitor fault - Radio Retro<\/title>\n<meta name=\"description\" content=\"How to replace the faulty capacitor and restore CD operation in a Bang &amp; Olufsen Beogram CD 3300 that refuses to play a disc.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/storycase.co.uk\/radio\/bang-olufsen\/beogram-cd-3300-capacitor-fault\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Beogram CD 3300 capacitor fault - 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