<div>Hi Mike and Randy,</div><div dir="auto">I’d also like to toss in my two cents regarding the age of these systems and the condition of the power supplies in each chassis.</div><div dir="auto"><br></div><div dir="auto">When you check them, check for voltage level and condition. Aging power supplies can begin to show drop offs in linear supplies, becoming unable to sustain a consistent voltage due to dry capacitors. Check the voltage with an oscilloscope in AC mode for your best visual on this.</div><div dir="auto"><br></div><div dir="auto">G~</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 7, 2020 at 4:21 PM Randy Ellsworth <<a href="mailto:randyellsworth18@gmail.com">randyellsworth18@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div><span style="font-family:UICTFontTextStyleBody;font-size:17px"></span><div dir="ltr" style="font-family:UICTFontTextStyleBody;font-size:17px">Hi Mike,<div style="font-family:UICTFontTextStyleBody"><br></div><div style="font-family:UICTFontTextStyleBody">Nice to meet you!</div><div style="font-family:UICTFontTextStyleBody"><br></div><div dir="auto" style="font-family:UICTFontTextStyleBody">Like Shawn says we’ve very familiar with the GCA steppers, but have very limited experience with PG’s. Some things like stages and the laser are the same and we could potentially help you out. </div><div style="font-family:UICTFontTextStyleBody"><br></div><div style="font-family:UICTFontTextStyleBody">It would be helpful if you can measure the laser power to see if that confirms your suspicions about losing laser counts. A weak laser could definitely cause trouble like you’ve described. </div><div style="font-family:UICTFontTextStyleBody"><br></div><div style="font-family:UICTFontTextStyleBody">Do you have a meter to measure the power output of the He-Ne laser? <br><br>We can lend you our meter and send it to you quickly if you provide a FedEx number. </div><div style="font-family:UICTFontTextStyleBody"><br>Reseating the interface and servo chassis PCB’s can sometimes resolve laser count issues. <br><br><br><div dir="ltr" style="font-family:UICTFontTextStyleBody">Take Care,<br><div style="font-family:UICTFontTextStyleBody"><br></div><div style="font-family:UICTFontTextStyleBody">Randy Ellsworth </div><div style="font-family:UICTFontTextStyleBody">CEO/Owner</div><div style="font-family:UICTFontTextStyleBody">Stepper Care Services, Inc</div><div style="font-family:UICTFontTextStyleBody">(512)913-2781</div></div></div></div></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 7, 2020 at 11:10 AM Shawn Wright <<a href="mailto:wrightsh@lnf.umich.edu" target="_blank">wrightsh@lnf.umich.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div style="word-wrap:break-word;line-break:after-white-space">Hi Mike,<div><br></div><div>You could contact <a href="mailto:rellsworth@austin.rr.com" target="_blank">Randy Ellsworth</a> with Stepper Care Services. We have a service contract with them for our AutoStep 200 and they have a lot of experience with these tools, and have parts. They even got us back in tip-top shape after a pretty serious flood that filled up the environmental chambers HEPA filter and rained over the whole system.</div><div><br></div><div>Thanks,</div><div>Shawn Wright</div><div>Lead Research Engineer</div><div>Lurie Nanofabrication Facility</div><div>University of Michigan</div><div><br></div><div><div><br></div><div><br><blockquote type="cite"><div>On Dec 4, 2020, at 9:31 AM, Michael Call <<a href="mailto:michael.call@maine.edu" target="_blank">michael.call@maine.edu</a>> wrote:</div><br><div><div dir="ltr"><div>We have an issue with "Focus Signal lost" and "time out" errors on our pattern generator. Sometimes the column will attempt to focus off of the glass plate(laser system losing counts?). I've cleaned and oiled the stages, changed plates and all of the usual, but with no luck. I know that Bob Scruton passed away a few years ago. Has anyone taken over the service of these machines?</div><div><br></div><div>Thanks,<br></div><div><div><br>-- <br><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>Mike Call <br>Research Engineer<br>University of Maine <br></div><div>Frontier Institute for Research in Sensor Technologies (FIRST)</div><div>Coordinated Research entities Cleanroom </div><div>ESRB Barrows Hall room 294<br></div><div>207-581-3382</div><div><span id="m_-322453577088404159m_-7156543052484685157cid:ii_k36d2cvb1"><image.png></span></div></div></div></div></div></div></div></div></div></div>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><span style="font-size:12.8px">Greg Mullins</span></div><div>R&D Engineer 4</div><div> </div><div>Marvell Nanofabrication Laboratory<br>University of California at Berkeley</div><div>520 Sutardja Dai Hall, MS 1754<br>Berkeley, CA 94720-1754<br>Office: (510) 809-8625<br></div><div>Email: <a href="mailto:gregmullins@berkeley.edu" target="_blank">gregmullins@berkeley.edu</a></div></div></div></div></div></div></div></div>