{"id":13361,"date":"2024-04-15T09:25:05","date_gmt":"2024-04-15T08:25:05","guid":{"rendered":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13361"},"modified":"2024-04-27T08:50:18","modified_gmt":"2024-04-27T07:50:18","slug":"cd-80","status":"publish","type":"post","link":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13361","title":{"rendered":"CD 80 – 12 \/ 8 cm disc problem"},"content":{"rendered":"

This CD 80 japan version 100 v , has a strange problem , audio distortion after few minutes or hours<\/p>\n

\"\"<\/p>\n

Error Flag becomes high and \u00a0audio distortion is audible Audio Distortion<\/a><\/span><\/p>\n

\"\"<\/p>\n

Found something in PWM to motor , this is PWM in stop 50%<\/p>\n

\"\"<\/p>\n

Eye is moving a lot ?!\u00a0 <\/a><\/span>Disc speed ,<\/span> Here is the PWM when distortion \u00a0occours , Buffer overflow , disc is rotating to fast<\/p>\n

\"\"<\/p>\n

I think i found something , with 12cm Disc’s the player thinks its a 8 cm Disc<\/p>\n

\"\"<\/p>\n

Motor speed control (see Fig. 10)<\/em><\/strong>
\nThe motor speed control (MSC) output from pin 17 (24) is a pulse-width modulated signal. The duty factor of the pulse-width modulation is calculated from the difference in numerical value between the WRITE 1and READ 1addresses, the difference being nominally half of the FIFO space. The calculation is performed at a rate of 88,2 kHz.<\/em><\/strong>
\nThe duty factor of MSC varies in 62 steps from 1,6% (FIFO full) to 98,4% (FIFO empty). When a motor-start signal is detected (via SWAB\/SSM) the duty factor is forced to 98,4% for 0,2 seconds followed by a normal, calculated signal. After a motor-stop signal is detected the duty factor is forced<\/em><\/strong>
\nto 1,6% for 0,2 seconds followed by a continuous 50% duty factor. A change in motor start\/stop status occurring within the 0,2 second periods overrides the previous condition and resets the data control timer.”<\/em><\/strong><\/p>\n

\"\"<\/p>\n

if we make this point low, the players is working fine with normal 12cm discs<\/p>\n

\"\"<\/p>\n

PWM now about 50 % , no buffer overflow , could it be a firmware issue..?! this player has a P111 masked processor<\/p>\n

The processor is determing the disc size at start-up , \u00a0measuring the MC signal..<\/p>\n

\"\"<\/p>\n

i have seen CD80 with P123 masked processors.<\/p>\n

\"\"<\/p>\n

I check and check the circuit and measured all Resitors and Capicitor and i found 1 resistor that is not correct according to the diagram<\/p>\n

\"\"<\/p>\n

120 k instead off 110 k<\/p>\n

\"\"<\/p>\n

Change the 120k to 110k<\/p>\n

there is a change, \u00a0the player now work a little bit beter disc of 16 gram play fine , disc of 15 gram not<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

After i changed the resistor to 75k the player works correct with 12 and 8 cm Disc’s<\/p>\n

There must be a problem in de closed loop , but i cannot pinpoint the problem. i have checked the motorcircuit , capicitors ect ect. Maybe Firmware P111 is a liitle different then P123…<\/p>\n

Replaced 2 relais in audio path , some stranges level jumps.<\/p>\n

\"\"<\/p>\n

Replace small blue Philips Capicitors, drop to 25% in capacity.<\/p>\n

\"\"<\/p>\n

Working Fine playing 12cm and 8cm disc \ud83d\ude42<\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

This CD 80 japan version 100 v , has a strange problem , audio distortion after few minutes or hours Error Flag becomes high and \u00a0audio distortion is audible Audio Distortion Found something in...<\/p>\n","protected":false},"author":1,"featured_media":13357,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100,3],"tags":[],"class_list":["post-13361","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cd-80","category-repair"],"yoast_head":"\nCD 80 - 12 \/ 8 cm disc 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=13361\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CD 80 - 12 \/ 8 cm disc problem - 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