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<title>fritzm.github.io - PDP-11/45: AC power and cooling</title>
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<h1>PDP-11/45: AC power and cooling</h1>
Sun 07 June 2015
by <a class="url fn" href="https://fritzm.github.io/author/fritz-mueller.html">Fritz Mueller</a>
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<div><p>Spent a lot of time over a couple weekends cleaning and reconditioning all the muffin cooling fans for the CPU
cabinet and power supplies. As you can see in the photo below, there are a lot of these! All reassembled
now, and wired along with the back-of-cabinet power distribution board. Also did a clean on the big box fan
at the top of the rack, not seen here.</p>
<p>I have also completely torn down the H742s to give them a thorough clean, touch up a few last corrosion spots,
and replace the failing neon indicators.</p>
<p><img src='/images/pdp11/chassis-with-fans_thumbnail_tall.jpg' title='CPU cabinet with restored cooling fans' onclick='pswipe("pdp11",9);'/>
<img src='/images/pdp11/742-rebuild_thumbnail_tall.jpg' title='Deeper into the H742s for cleaning, sanding, and painting' onclick='pswipe("pdp11",10);'/></p></div>
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