{"id":17506,"date":"2026-01-18T06:03:52","date_gmt":"2026-01-18T05:03:52","guid":{"rendered":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=17506"},"modified":"2026-01-28T19:35:36","modified_gmt":"2026-01-28T18:35:36","slug":"cd-16-wont-read-disc","status":"publish","type":"post","link":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=17506","title":{"rendered":"CD 16 CD loading Problem and DAC problem"},"content":{"rendered":"

When it reads CD’s it play flawless and audio is present\u00a0 on the digital output ,\u00a0 Analog won’t work ;-( ,<\/p>\n

The player has been in a repair shop for CD loading problems. then the said the is laser broken and the player could not be repaired ;-o<\/p>\n

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Lets check if the SM5803 is working<\/p>\n

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Okay what is this…?! why..?!<\/p>\n

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DOL Data Left channel when in stop , look okay<\/p>\n

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BCKO , the bit clock, okay<\/p>\n

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Play a CD , data on DOL & DOR<\/p>\n

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I see some strandes orange dots on safety resistors \u00a0, the are burned<\/p>\n

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7 in total all in the + & – 5 volt<\/p>\n

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Replaced the resisitos and now \u00a0we have a working right Channel.., left is still dead…;-( , aha Left channel TDA1547 has vREF of -0.5 instead of 4.7volt…the 560 ohm ressitor is fine ..<\/p>\n

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Carefully desoldered sDIL IC \u00a0, -5 volt for pin 8 & 25 \u00a0is correct now<\/p>\n

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bought <\/span>NOS TDA1547 ….New Old Stock \ud83d\ude09<\/p>\n

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Repaired DAC Board<\/p>\n

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Next CD Loading , New Belt and cleaning all pulleys .<\/p>\n

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Two things I noticed: an SM5852 for the SPDIF output, but only the mute input of the SM5852 is being used..?!<\/span><\/span><\/span><\/div>\n
The SM5852 has Digital Dynamic Bass Boost and Digital Dynamic Compression, but it’s not connected.<\/span><\/span><\/span><\/div>\n
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Datasheet : SM5852AS<\/a><\/span><\/div>\n
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The Digital filter the SM5803 has its own CPU that probably controls some of the volume or attention ,<\/span><\/span><\/span><\/div>\n
only ATSB is connected here as an input click-clack, possibly the CPU also sets the filter to the correct input and output mode.<\/span><\/span><\/span><\/div>\n<\/div>\n
Datasheet : SM5803AP<\/a><\/span><\/div>\n
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When it reads CD’s it play flawless and audio is present\u00a0 on the digital output ,\u00a0 Analog won’t work ;-( , The player has been in a repair shop for CD loading problems. then...<\/p>\n","protected":false},"author":1,"featured_media":17499,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[142,120,3,302],"tags":[305,285],"class_list":["post-17506","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cd-16","category-marantz","category-repair","category-tda1547","tag-sm5803","tag-tda1547"],"yoast_head":"\nCD 16 CD loading Problem and DAC problem - 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=17506\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CD 16 CD loading Problem and DAC problem - 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