{"id":3972,"date":"2024-01-08T14:39:52","date_gmt":"2024-01-08T22:39:52","guid":{"rendered":"https:\/\/www.rbdinstruments.com\/blog\/?p=3972"},"modified":"2024-01-08T14:39:54","modified_gmt":"2024-01-08T22:39:54","slug":"model-99-abs-current-preamplifier-no-signal-problem","status":"publish","type":"post","link":"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/","title":{"rendered":"Model 99 ABS Current Preamplifier no signal problem"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The Model 99 Current Preamplifier is used on the older PHI (Physical Electronics) 660 scanning Auger electron spectrometers.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><a href=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"3973\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/20240108_134700_resized\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"20240108_134700_resized\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/plugins\/jquery-image-lazy-loading\/images\/grey.gif?w=584&#038;ssl=1\" data-original=\"https:\/\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized-1024x1024.jpg\" alt=\"99 ABS preamp\" class=\"lazy wp-image-3973\"\/><noscript><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"584\" height=\"584\" data-attachment-id=\"3973\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/20240108_134700_resized\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"20240108_134700_resized\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?resize=584%2C584&#038;ssl=1\" alt=\"99 ABS preamp\" class=\"wp-image-3973\" srcset=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?w=1512&amp;ssl=1 1512w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134700_resized.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/noscript><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">There is a fairly common problem with this design of preamplifier where the input JFET can get damaged from sample arcing which results in a total loss of ABS (absorbed current) image.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common solution to this issue is to replace QN2 which is a 2N5546 dual JFET.  These parts are obsolete but readily available on Ebay. You can also find equivalent replacement JFETs such as the EXR461.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To replace QN2, first remove the cover from the 99 ABS preamp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The picture below shows the location of QN2.  <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"3974\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/location\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"location\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/plugins\/jquery-image-lazy-loading\/images\/grey.gif?w=584&#038;ssl=1\" data-original=\"https:\/\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location-1024x1024.jpg\" alt=\"\" class=\"lazy wp-image-3974\"\/><noscript><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"584\" height=\"584\" data-attachment-id=\"3974\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/location\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"location\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?resize=584%2C584&#038;ssl=1\" alt=\"\" class=\"wp-image-3974\" srcset=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?w=1512&amp;ssl=1 1512w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/location.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/noscript><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Use a tweezers to pull up each leg of QN2 as you heat it with a soldering iron and then use a solder sucker or copper braid to remove all the solder from the holes on the circuit board.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"3975\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/20240108_134630_resized\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"20240108_134630_resized\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/plugins\/jquery-image-lazy-loading\/images\/grey.gif?w=584&#038;ssl=1\" data-original=\"https:\/\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized-1024x1024.jpg\" alt=\"\" class=\"lazy wp-image-3975\"\/><noscript><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"584\" height=\"584\" data-attachment-id=\"3975\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/20240108_134630_resized\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"20240108_134630_resized\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?resize=584%2C584&#038;ssl=1\" alt=\"\" class=\"wp-image-3975\" srcset=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?w=1512&amp;ssl=1 1512w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/noscript><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Note the location of the tab that is on the circuit board and then bend the leads on the replacement 2N5546 so that the leads line up with the holes in the board. Press the 2N5546 down so that the pins are firmly in the holes, then remove the 2N5546 and cut the ends of the leads so that they are shorter.  You only want about 1\/8&#8243; of the leads going into to the holes as otherwise the leads might short to the chassis. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Insert the 2N5546 into the holes and solder the lead wires to the board. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing QN2 will likely restore the ABS image.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The schematic below shows that QN2 is the first thing that sees the input signal and so it makes sense that QN2 would likely be damaged from an arc.  Also, JFETs are susceptible to arc damage more than a lower impedance device such as an op amp.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"3976\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/20240108_134845_resized\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"20240108_134845_resized\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/plugins\/jquery-image-lazy-loading\/images\/grey.gif?w=584&#038;ssl=1\" data-original=\"https:\/\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized-1024x1024.jpg\" alt=\"\" class=\"lazy wp-image-3976\" style=\"aspect-ratio:1;width:614px;height:auto\"\/><noscript><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"584\" height=\"584\" data-attachment-id=\"3976\" data-permalink=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/20240108_134845_resized\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?fit=1512%2C1512&amp;ssl=1\" data-orig-size=\"1512,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"20240108_134845_resized\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?fit=584%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?resize=584%2C584&#038;ssl=1\" alt=\"\" class=\"wp-image-3976\" style=\"aspect-ratio:1;width:614px;height:auto\" srcset=\"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?w=1512&amp;ssl=1 1512w, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134845_resized.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/noscript><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For help with repairs or maintenance on your PHI 660 (or other older PHI surface analysis systems) please contact RBD Instruments here &#8211; <a href=\"https:\/\/rbdinstruments.com\/contact.html\">https:\/\/rbdinstruments.com\/contact.html<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to repair a 99 ABS preamp <a href=\"https:\/\/www.rbdinstruments.com\/blog\/model-99-abs-current-preamplifier-no-signal-problem\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3975,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"How to repair a 99 ABS preamp that is not giving an image. ","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[162],"tags":[441,438,439,440],"class_list":["post-3972","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operation-and-calibration-procedures","tag-2n5546","tag-99-abs-preamplifier","tag-absorbed-current","tag-no-image-in-abs-mode"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2024\/01\/20240108_134630_resized.jpg?fit=1512%2C1512&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p2DEXo-124","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/posts\/3972","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/comments?post=3972"}],"version-history":[{"count":1,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/posts\/3972\/revisions"}],"predecessor-version":[{"id":3977,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/posts\/3972\/revisions\/3977"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/media\/3975"}],"wp:attachment":[{"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/media?parent=3972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/categories?post=3972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rbdinstruments.com\/blog\/wp-json\/wp\/v2\/tags?post=3972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}