{"id":1493,"date":"2019-10-26T10:12:20","date_gmt":"2019-10-26T09:12:20","guid":{"rendered":"http:\/\/www.randomorbit.co.uk\/?p=1493"},"modified":"2019-10-26T10:12:20","modified_gmt":"2019-10-26T09:12:20","slug":"consolidated-computer-inc-pdp-8-clone-part-4-2nd-psu-refurbishment","status":"publish","type":"post","link":"https:\/\/www.randomorbit.co.uk\/?p=1493","title":{"rendered":"Consolidated Computer Inc. PDP-8 Clone \u2013 Part 4 2nd PSU refurbishment."},"content":{"rendered":"\n

The second PSU is the same model as the first and I went about its refurbishment in the same way.<\/p>\n\n\n\n

Firstly, I removed the capacitors. Here was the first problem. One of the smaller capacitors was leaking. Straight over to RS components to see if I could find a replacement. Bingo, next day delivery! Amazingly I found a capacitor of the same diameter with the screw terminals on the same centres with the same screw thread. Marvellous.<\/p>\n\n\n\n

\"\"<\/a>
The faulty capacitor from the second CCI power supply. The new capacitor is on the right.<\/figcaption><\/figure>\n\n\n\n

I tested the other caps with my capacitance meter and they all looked feasible. I then brought the up, one by one on my bench suply with the current fixed at < 20ma. As each one stabilised at it correct working voltage, I noted the leakage current and this was typically around 0.6-0.8ma. That’s not bad at all for 40 year old caps.<\/p>\n\n\n\n

Next the whole unit got a good dust, the terminals and fuses were cleaned with a wire brush and everything was reassembled prior to testing.<\/p>\n\n\n\n

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The second CCI power supply after refurbishment. The new capacitor is on the left.<\/figcaption><\/figure><\/div>\n\n\n\n

On of the wires running from a rectifyer was showing signes of bad corrosion so I made a new cable up with new connectors and fitted that.<\/p>\n\n\n\n

I went through the same tests with car tail-light bulbs as I had for PSU1 and they lit up beautifully.<\/p>\n\n\n\n

Two down, one to go.<\/p>\n","protected":false},"excerpt":{"rendered":"

The second PSU is the same model as the first and I went about its refurbishment in the same way. Firstly, I removed the capacitors. Here was the first problem. One of the smaller capacitors was leaking. Straight over to RS components to see if I could find a replacement. Bingo, next day delivery! Amazingly … Continue reading Consolidated Computer Inc. PDP-8 Clone \u2013 Part 4 2nd PSU refurbishment.<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[47,135,136,33],"tags":[139,144],"class_list":["post-1493","post","type-post","status-publish","format-standard","hentry","category-c93-blog-posts","category-cci-pdp-8-clone","category-retro-computing","category-c84-retro-tech","tag-cci","tag-computers-dec-pdp-retro"],"featured_image_src":null,"author_info":{"display_name":"andy","author_link":"https:\/\/www.randomorbit.co.uk\/?author=1"},"_links":{"self":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1493"}],"version-history":[{"count":1,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1493\/revisions"}],"predecessor-version":[{"id":1494,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1493\/revisions\/1494"}],"wp:attachment":[{"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.randomorbit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}