Re: B92A no sweep


Brent Watson <brentleew2003@...>
 

Thanks Dennis,I did try the freeze spray, I though I had a result but then chalked it up to random, intermittent activity.I did try my heat gun attached to my reflow station and kept it all quite tame. Neither gave the response I was hoping. But I did run out of freeze spray before I could reach any solid conclusions, and I did not have the extender at that point. I thought I had a reaction to cold on the back ( covered by the sweep logic board) half of the interface board (B069999 and up) possibly Q902, Q912 or Q900, Q910. But I pulled and checked them and they test out OK.I will keep digging: the logic is thick though.

From: "'Dennis Tillman' @Dennis_Tillman_W7pF [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Tuesday, February 14, 2017 9:03 AM
Subject: RE: [TekScopes] B92A no sweep

  Hi Brent,
To get an intermittent to act up I reach for two things. I grab a can of
freeze spray, and a hair dryer. Use the hair dryer to warm up the entire
plugin. Do not use a Hot Air Gun - it gets too hot.

The freeze spray allows you to focus tighter on individual ICs or on small
areas of the PC board. More often than not the heat or the cold will trigger
an intermittent back to life.

Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, February 13, 2017 8:17 PM
Subject: [TekScopes] B92A no sweep

I forgot to mention that, initially last week the problem began with the
sweep working fine for the first 30 seconds and then quit. It might come
back for a few moments, even another 30 seconds on occasion before not
working at all: I assumed from a component warming up. This week however it
has not worked at all. I was able to use a thermal camera to look at heat on
the boards and found nothing unusual.Whatever it is, it isn't intermittent
any longer.
------------------------------------
Posted by: brentleew2003@...
------------------------------------

#yiv5792283176 #yiv5792283176 -- #yiv5792283176ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv5792283176 #yiv5792283176ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv5792283176 #yiv5792283176ygrp-mkp #yiv5792283176hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv5792283176 #yiv5792283176ygrp-mkp #yiv5792283176ads {margin-bottom:10px;}#yiv5792283176 #yiv5792283176ygrp-mkp .yiv5792283176ad {padding:0 0;}#yiv5792283176 #yiv5792283176ygrp-mkp .yiv5792283176ad p {margin:0;}#yiv5792283176 #yiv5792283176ygrp-mkp .yiv5792283176ad a {color:#0000ff;text-decoration:none;}#yiv5792283176 #yiv5792283176ygrp-sponsor #yiv5792283176ygrp-lc {font-family:Arial;}#yiv5792283176 #yiv5792283176ygrp-sponsor #yiv5792283176ygrp-lc #yiv5792283176hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv5792283176 #yiv5792283176ygrp-sponsor #yiv5792283176ygrp-lc .yiv5792283176ad {margin-bottom:10px;padding:0 0;}#yiv5792283176 #yiv5792283176actions {font-family:Verdana;font-size:11px;padding:10px 0;}#yiv5792283176 #yiv5792283176activity {background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}#yiv5792283176 #yiv5792283176activity span {font-weight:700;}#yiv5792283176 #yiv5792283176activity span:first-child {text-transform:uppercase;}#yiv5792283176 #yiv5792283176activity span a {color:#5085b6;text-decoration:none;}#yiv5792283176 #yiv5792283176activity span span {color:#ff7900;}#yiv5792283176 #yiv5792283176activity span .yiv5792283176underline {text-decoration:underline;}#yiv5792283176 .yiv5792283176attach {clear:both;display:table;font-family:Arial;font-size:12px;padding:10px 0;width:400px;}#yiv5792283176 .yiv5792283176attach div a {text-decoration:none;}#yiv5792283176 .yiv5792283176attach img {border:none;padding-right:5px;}#yiv5792283176 .yiv5792283176attach label {display:block;margin-bottom:5px;}#yiv5792283176 .yiv5792283176attach label a {text-decoration:none;}#yiv5792283176 blockquote {margin:0 0 0 4px;}#yiv5792283176 .yiv5792283176bold {font-family:Arial;font-size:13px;font-weight:700;}#yiv5792283176 .yiv5792283176bold a {text-decoration:none;}#yiv5792283176 dd.yiv5792283176last p a {font-family:Verdana;font-weight:700;}#yiv5792283176 dd.yiv5792283176last p span {margin-right:10px;font-family:Verdana;font-weight:700;}#yiv5792283176 dd.yiv5792283176last p span.yiv5792283176yshortcuts {margin-right:0;}#yiv5792283176 div.yiv5792283176attach-table div div a {text-decoration:none;}#yiv5792283176 div.yiv5792283176attach-table {width:400px;}#yiv5792283176 div.yiv5792283176file-title a, #yiv5792283176 div.yiv5792283176file-title a:active, #yiv5792283176 div.yiv5792283176file-title a:hover, #yiv5792283176 div.yiv5792283176file-title a:visited {text-decoration:none;}#yiv5792283176 div.yiv5792283176photo-title a, #yiv5792283176 div.yiv5792283176photo-title a:active, #yiv5792283176 div.yiv5792283176photo-title a:hover, #yiv5792283176 div.yiv5792283176photo-title a:visited {text-decoration:none;}#yiv5792283176 div#yiv5792283176ygrp-mlmsg #yiv5792283176ygrp-msg p a span.yiv5792283176yshortcuts {font-family:Verdana;font-size:10px;font-weight:normal;}#yiv5792283176 .yiv5792283176green {color:#628c2a;}#yiv5792283176 .yiv5792283176MsoNormal {margin:0 0 0 0;}#yiv5792283176 o {font-size:0;}#yiv5792283176 #yiv5792283176photos div {float:left;width:72px;}#yiv5792283176 #yiv5792283176photos div div {border:1px solid #666666;height:62px;overflow:hidden;width:62px;}#yiv5792283176 #yiv5792283176photos div label {color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}#yiv5792283176 #yiv5792283176reco-category {font-size:77%;}#yiv5792283176 #yiv5792283176reco-desc {font-size:77%;}#yiv5792283176 .yiv5792283176replbq {margin:4px;}#yiv5792283176 #yiv5792283176ygrp-actbar div a:first-child {margin-right:2px;padding-right:5px;}#yiv5792283176 #yiv5792283176ygrp-mlmsg {font-size:13px;font-family:Arial, helvetica, clean, sans-serif;}#yiv5792283176 #yiv5792283176ygrp-mlmsg table {font-size:inherit;font:100%;}#yiv5792283176 #yiv5792283176ygrp-mlmsg select, #yiv5792283176 input, #yiv5792283176 textarea {font:99% Arial, Helvetica, clean, sans-serif;}#yiv5792283176 #yiv5792283176ygrp-mlmsg pre, #yiv5792283176 code {font:115% monospace;}#yiv5792283176 #yiv5792283176ygrp-mlmsg * {line-height:1.22em;}#yiv5792283176 #yiv5792283176ygrp-mlmsg #yiv5792283176logo {padding-bottom:10px;}#yiv5792283176 #yiv5792283176ygrp-msg p a {font-family:Verdana;}#yiv5792283176 #yiv5792283176ygrp-msg p#yiv5792283176attach-count span {color:#1E66AE;font-weight:700;}#yiv5792283176 #yiv5792283176ygrp-reco #yiv5792283176reco-head {color:#ff7900;font-weight:700;}#yiv5792283176 #yiv5792283176ygrp-reco {margin-bottom:20px;padding:0px;}#yiv5792283176 #yiv5792283176ygrp-sponsor #yiv5792283176ov li a {font-size:130%;text-decoration:none;}#yiv5792283176 #yiv5792283176ygrp-sponsor #yiv5792283176ov li {font-size:77%;list-style-type:square;padding:6px 0;}#yiv5792283176 #yiv5792283176ygrp-sponsor #yiv5792283176ov ul {margin:0;padding:0 0 0 8px;}#yiv5792283176 #yiv5792283176ygrp-text {font-family:Georgia;}#yiv5792283176 #yiv5792283176ygrp-text p {margin:0 0 1em 0;}#yiv5792283176 #yiv5792283176ygrp-text tt {font-size:120%;}#yiv5792283176 #yiv5792283176ygrp-vital ul li:last-child {border-right:none !important;}#yiv5792283176



[Non-text portions of this message have been removed]

Join TekScopes@groups.io to automatically receive all group messages.