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<title>fritzm.github.io - PDP-11/45: H720E teardown and inspection</title>
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<h1>PDP-11/45: H720E teardown and inspection</h1>
Sun 18 September 2016
by <a class="url fn" href="https://fritzm.github.io/author/fritz-mueller.html">Fritz Mueller</a>
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<div><p>Started in on the H720E power supply that is part of RK05 storage system. Just initial teardown, cleaning, and
inspection for obviously failed parts. Looks pretty good, though there is a lot of dust and grime because this
unit lost its top cover plate somewhere over the years (I'll have to build some sort of replacement).</p>
<p>There are a couple of 22,000 mFD 50v electrolytic caps here that I'll try reforming before hitting them at full power,
since they've been sitting idle for upwards of 30yrs! Also, one obviously leaking 330 mfd axial on regulator board, so
I'll replace this and all its identical twins. Parts on order...</p>
<p><img src='/images/pdp11/h720e-breakdown_thumbnail_tall.jpg' title='Tearing down the H720E power supply for the RK11 storage controller' onclick='pswipe("pdp11",38);'/>
<img src='/images/pdp11/h720e-leaking-cap_thumbnail_tall.jpg' title='Leaking tantalum cap on H720e regulator board' onclick='pswipe("pdp11",39);'/></p></div>
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