{"id":1684,"date":"2018-02-17T11:11:58","date_gmt":"2018-02-17T10:11:58","guid":{"rendered":"http:\/\/www.pdp-11.de\/?page_id=1684"},"modified":"2024-06-02T16:25:39","modified_gmt":"2024-06-02T14:25:39","slug":"fan-overhaul","status":"publish","type":"page","link":"https:\/\/www.pdp-11.de\/index.php\/knowledge-base\/fan-overhaul\/","title":{"rendered":"Fan Overhaul BA11-A"},"content":{"rendered":"

Mostly all the Fans in my PDP-11\/24 and PDP-11\/44 systems placed in the L-Box (BA11-A<\/span>) are damaged, which is a big issue as they have an unusual voltage and frequency.<\/p>\n

There are 3 Fans in an BA11-A which are responsible to cool the Card Cage and the Power Supply.<\/p>\n

I was able to buy 3 NOS Fans, but they were so expensive, that I was searching for a way, to repair the old Blowers.<\/p>\n

In the last Haul were a version of the Fan, which can simply be opened to replace the ball bearings.<\/p>\n

This is great, as there is not much more than the ball bearing, which can be go bad.<\/p>\n

After some investigation and measurement I have found a reseller, where I can get some types of the bearings in two different qualities.<\/p>\n

I have chosen the SS R166 ZZ version, and have started to change the bearings. Each bearing costs about 1,50\u20ac.<\/p>\n

Here is the process in pictures:<\/p>\n

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