{"id":1380,"date":"2020-12-05T21:08:31","date_gmt":"2020-12-06T02:08:31","guid":{"rendered":"https:\/\/paulcarbone.com\/blog\/?p=1380"},"modified":"2023-06-04T10:17:11","modified_gmt":"2023-06-04T15:17:11","slug":"akai-s900","status":"publish","type":"post","link":"https:\/\/paulcarbone.com\/blog\/akai-s900\/","title":{"rendered":"Akai S900"},"content":{"rendered":"\n

Taking a quick detour from oscilloscope repair to attempt to fix a RAM error on an Akai S900 sampler that I just scored for cheap. The two issues were a dim backlight, and RAM error “Bad RAM Bit DK09”<\/p>\n\n\n\n

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the logic board – check out that honkin linear power supply<\/figcaption><\/figure>\n\n\n\n

Thanks to DOSputin for compiling a reference of what codes refer to what chips here<\/a>.
The best copy of the service manual can be found at this page<\/a>, along with a wealth of other info on the S900.

DK09 refers to IC62. This thread<\/a> confirms that there’s no way to test them all at once; you only get one bad ram message at a time, which means you have to take the whole damn thing apart, change the ram, reassemble it, then do the test again to find out where the next problem is. <\/p>\n\n\n\n

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

Someone has been in this unit before. 3 of the 6 screws to attach the voice board were missing. It appears someone had dealt with a RAM issue before, as IC60 is now socketed. I’d planned on doing the same. After replacing IC62, I get another error: DJ12 – IC57. Fortunately, that was it, now the RAM test passes.<\/p>\n\n\n\n

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

The latest firmware is V1.2C. I have V1.2A. I don’t think this matters, as I boot to what’s either called OS2 or OS4 with a floppy.<\/p>\n\n\n\n

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

Taking a quick detour from oscilloscope repair to attempt to fix a RAM error on an Akai S900 sampler that I just scored for cheap. The two issues were a dim backlight, and RAM error “Bad RAM Bit DK09” Thanks … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"table_tags":[],"_links":{"self":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1380"}],"collection":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/comments?post=1380"}],"version-history":[{"count":5,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1380\/revisions"}],"predecessor-version":[{"id":1390,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/1380\/revisions\/1390"}],"wp:attachment":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/media?parent=1380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/categories?post=1380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/tags?post=1380"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/table_tags?post=1380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}