{"id":1035,"date":"2017-04-18T00:51:20","date_gmt":"2017-04-18T05:51:20","guid":{"rendered":"http:\/\/www.ssec.wisc.edu\/aeri\/?page_id=1035"},"modified":"2024-09-25T21:41:07","modified_gmt":"2024-09-25T21:41:07","slug":"laser-replacement-procedure","status":"publish","type":"page","link":"https:\/\/www.ssec.wisc.edu\/aeri\/kb\/procedures\/repair\/laser-replacement-procedure\/","title":{"rendered":"Laser Replacement Procedure"},"content":{"rendered":"<h3>Tools and Equipment Required<\/h3>\n<ul>\n<li>Replacement laser<\/li>\n<li class=\"p1\">Anti-static wrist strap<\/li>\n<li class=\"p1\">Phillips screw driver<\/li>\n<li class=\"p1\">Pliers for tensioning the laser brackets (optional)<\/li>\n<li class=\"p1\">Small bags\/cups for loose screws<\/li>\n<li class=\"p1\">Tape for stabilizing laser power supply<\/li>\n<li class=\"p1\">Lens tissue + 95% ethanol, for laser cleaning, if necessary<\/li>\n<\/ul>\n<div style=\"background-color: #fcf8e3;\">\n<h3>Precaution<\/h3>\n<ul>\n<li>This procedure is for replacing lasers in Standard Range AERI instruments that do not have hygroscopic (humidity sensitive) optics. \u00a0For Extended Range (ER) AERIs, see the alternate <a href=\"https:\/\/www.ssec.wisc.edu\/aeri\/kb\/procedures\/repair\/aeri-laser-replacement-procedure\/\">Laser Replacement Procedure with Purge<\/a><\/li>\n<li>The laser and other electronics inside the AERI are static sensitive. \u00a0Wear a grounded anti-static wrist strap when handling the laser and components inside the AERI.<\/li>\n<\/ul>\n<\/div>\n<h3>Procedure<\/h3>\n<ol>\n<li class=\"p1\">Power OFF the AERI instrument (either using the power bar in the back-end, or by unplugging AC power, or using the iBootBar).<\/li>\n<li class=\"p1\">Remove the laser access panel in the middle of the back of the instrument &#8211; it&#8217;s held on by 8 Phillips head screws (see Fig. 2).<\/li>\n<li class=\"p1\"><span class=\"s2\">Wear a grounded anti-static wrist strap when handling the laser and components inside the AERI.<\/span><\/li>\n<li class=\"p1\">The laser inside the access panel may still have charge on it and needs to be discharged.<span class=\"Apple-converted-space\">\u00a0 <\/span>Using a screw driver with an isolated handle, discharge the laser tube by making short-circuit between the laser terminal (red wire) and the metal case of the instrument: \u00a0T<span class=\"Apple-converted-space\">ouch the screwdriver tip to the terminal, and the side to the instrument case. \u00a0<\/span>Usually a small spark will be visible at the terminal (see Figs. 3, 6).<\/li>\n<li class=\"p1\">Unscrew the laser power supply: it&#8217;s secured with two Phillips head screws located above the power supply (see Fig. 3).<\/li>\n<li class=\"p1\">Remove the laser power supply, being careful not to strain the wires going to the laser.<span class=\"Apple-converted-space\">\u00a0 <\/span>The power supply needs to be secured near the instrument.<span class=\"Apple-converted-space\">\u00a0 <\/span>One option is to hold the power supply against the AERI case using tape (see Fig. 4).<\/li>\n<li>Confirm that that laser has been discharged, by repeating step #4, now that the laser terminal is more clearly visible and accessible.<\/li>\n<li class=\"p1\">Unscrew the two screws that hold the straps that keep the laser tube and ballast resistor (inside white plastic tube, on red wire) in place (see Figs 5, 6).<\/li>\n<li class=\"p1\">Carefully remove the laser tube from the interferometer. \u00a0It&#8217;s easiest to remove the red side first. \u00a0Carefully remove the red and black leads from the terminals, taking care not to strain the solder joints on the wires.<\/li>\n<li class=\"p1\">Note the serial number of the old laser (e.g. 1234AB), wrap up the tube, and label with the date removed and the site.<\/li>\n<li class=\"p1\">Inspect the new laser.<span class=\"Apple-converted-space\">\u00a0 Remove the small black cap from the lasing surface if needed (and cap the old laser).\u00a0 <\/span>The lasing surface should be clean. \u00a0Clean with 95% ethanol if necessary. \u00a0Note the serial number of the new laser begin installed.<\/li>\n<li>Attach the red and black leads to the laser terminals. \u00a0Make sure the connectors make a good connection with the terminals. \u00a0The connector on the black lead in particular may need to be squeezed to ensure good contact with the terminal. \u00a0Take care not to strain the solder joints on the wires.<\/li>\n<li>Carefully install the laser tube onto the v-groove mount. \u00a0The pin on the right ring must slide into the alignment hole on the back of the right mount.<\/li>\n<li class=\"p1\">Secure the two straps around the laser tube and attach with the two screws.<span class=\"Apple-converted-space\">\u00a0 <\/span>The ballast resistor assembly also gets secured with the right screw.<span class=\"Apple-converted-space\">\u00a0 <\/span>The resistor assembly should be oriented with the red wire going to laser coming out from the top, and should be completely vertical (see Figs. 5, 6).<span class=\"Apple-converted-space\">\u00a0 <\/span>Snug the straps against the laser tube, either by gently pushing down from above, or by gripping the bottom with tweezers\/pliers and pulling down gently.<span class=\"Apple-converted-space\">\u00a0 <\/span>Tighten the two screws holding the straps.<\/li>\n<li class=\"p1\">Ensure that the laser tube is secure.<span class=\"Apple-converted-space\">\u00a0 <\/span>Gently grip the glass laser tube, and test if it can be moved with respect to its bracket.<span class=\"Apple-converted-space\">\u00a0 <\/span>If the laser tube can be moved, then the strap holding it down needs to be re-tightened: loosen the screws and retighten the straps, as described in the step above.<\/li>\n<li class=\"p1\">Take a photo of the configuration.<\/li>\n<li class=\"p1\">Re-install the laser power supply.<span class=\"Apple-converted-space\">\u00a0 <\/span>The two Philips head screws have limited access, so it is best to use a captive screwdriver, or simply use electrical tape to tape the head of the Philips screw and the shaft of the screwdriver, then remove once the screw has caught.<span class=\"Apple-converted-space\">\u00a0 <\/span>Be careful not to catch and squeeze the red and black laser wires behind the power supply.<span class=\"Apple-converted-space\">\u00a0 <\/span>It is best to get both screws of the laser power supply loosely into their thread, then route the laser wires so that they are free, then fully tighten the laser power supply screws. \u00a0Neatly pack the laser power supply input power cord on the right side.<\/li>\n<li class=\"p1\">Re-install the laser access panel with the 8 Phillips screws.<\/li>\n<li class=\"p1\">Power ON the instrument.<\/li>\n<li class=\"p1\">Confirm the laser alignment: \u00a0Observe the <a href=\"https:\/\/www.ssec.wisc.edu\/aeri\/kb\/troubleshooting\/interferometer-startup-sequence\/\">startup sequence<\/a> of LEDs (visible as a reflection on the back wall on the right side of the instrument) (see Fig. 8).<span class=\"Apple-converted-space\">\u00a0 <\/span>After the startup sequence (~1 minute), the top green light should be solid, and the bottom orange light should be blinking rapidly.\n<ol type=\"a\">\n<li>If the bottom orange light is blinking then the laser is operating correctly and the replacement is complete. \u00a0The instrument can be returned to service.<\/li>\n<li>If the bottom orange light is not blinking, or if a red light is solid or blinking, then the laser detector may\u00a0not be aligned\u00a0correctly. \u00a0Power OFF the AERI promptly, particularly if the interferometer is making abnormal sounds, and consult the mentor team on further action.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/14b.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-299 size-large\" src=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/5-768x1024.png\" alt=\"5\" width=\"768\" height=\"1024\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/5-768x1024.png 768w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/5-225x300.png 225w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/5.png 842w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p style=\"text-align: center;\">Figure 2. \u00a0Interferometer back-end<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/14b.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-300 size-large\" src=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/7a-1024x768.png\" alt=\"7a\" width=\"1024\" height=\"768\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/7a-1024x768.png 1024w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/7a-300x225.png 300w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/7a-768x576.png 768w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/7a.png 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p style=\"text-align: center;\">Figure 3. \u00a0Laser access port<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2041 size-large\" src=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-power-supply-768x1024.jpg\" alt=\"\" width=\"768\" height=\"1024\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-power-supply-768x1024.jpg 768w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-power-supply-225x300.jpg 225w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-power-supply-1152x1536.jpg 1152w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-power-supply-1536x2048.jpg 1536w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-power-supply-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/p>\n<p style=\"text-align: center;\">Figure 4. \u00a0Power supply removed<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2042 size-large\" src=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-resistor-installed-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-resistor-installed-1024x768.jpg 1024w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-resistor-installed-300x225.jpg 300w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-resistor-installed-768x576.jpg 768w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-resistor-installed-1536x1152.jpg 1536w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-resistor-installed-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p style=\"text-align: center;\">Figure 5. \u00a0Laser tube secured with straps. \u00a0Ballast resistor assembly is on the right<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-2043\" src=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-tube-installed-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-tube-installed-1024x768.jpg 1024w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-tube-installed-300x225.jpg 300w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-tube-installed-768x576.jpg 768w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-tube-installed-1536x1152.jpg 1536w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/laser-tube-installed-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p style=\"text-align: center;\">Figure 6. \u00a0Laser tube, with straps removed<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-2049\" src=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/Laser1-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/Laser1-1024x768.jpg 1024w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/Laser1-300x225.jpg 300w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/Laser1-768x576.jpg 768w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/Laser1-1536x1152.jpg 1536w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2021\/02\/Laser1-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p style=\"text-align: center;\">Figure 7. \u00a0AERI metrology laser<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-305\" src=\"http:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/22-225x300.jpg\" alt=\"22\" width=\"500\" height=\"667\" srcset=\"https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/22-225x300.jpg 225w, https:\/\/www.ssec.wisc.edu\/aeri\/wp-content\/uploads\/sites\/21\/2015\/10\/22.jpg 240w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p style=\"text-align: center;\">Figure 8. \u00a0Interferometer status lights during startup<\/p>\n<p style=\"text-align: center;\">\n","protected":false},"excerpt":{"rendered":"<p>Tools and Equipment Required Replacement laser Anti-static wrist strap Phillips screw driver Pliers for tensioning the laser brackets (optional) Small bags\/cups for loose screws Tape for stabilizing laser power supply Lens tissue + 95% ethanol, for laser cleaning, if necessary Precaution This procedure is for replacing lasers in Standard Range AERI instruments that do not [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"parent":560,"menu_order":4520,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1035","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/pages\/1035","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/comments?post=1035"}],"version-history":[{"count":5,"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/pages\/1035\/revisions"}],"predecessor-version":[{"id":2485,"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/pages\/1035\/revisions\/2485"}],"up":[{"embeddable":true,"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/pages\/560"}],"wp:attachment":[{"href":"https:\/\/www.ssec.wisc.edu\/aeri\/wp-json\/wp\/v2\/media?parent=1035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}