Re: 5440 Still No Trace


Ryan Scott
 

Hi All,
I just fixed one of these and George is correct.  Remove the input to the HV multiplier and then check for -3kV.  The only way to discharge the CRT is to remove it to gain access to the suction cup connector to discharge with a screwdriver to chassis ground.  
Be sure to check the fuse/ resistor in series with the Transistor and also the tantalum cap to ground in the Horiz out section.  I had 2 of these and was able to pull the HV multiplier from the other one and swap.  You can't check them staticly as they seem to fail under load.
Regards, Ryan N7QJ

On Monday, December 4, 2017, 7:18:20 PM PST, rpbale@... [TekScopes] <TekScopes@...> wrote:

 
I have a BK HV probe and have checked it several times over the years as different things caused the HV to go down. I'm pretty comfortable except for one thing. I wanted to discharge the CRT before but was told they bleed off. Still I'd rather just discharge it to be sure, but don't see an easy way to get to the bare metal part at the CRT.

Thanks

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


#yiv3948813226 #yiv3948813226 -- #yiv3948813226ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv3948813226 #yiv3948813226ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv3948813226 #yiv3948813226ygrp-mkp #yiv3948813226hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv3948813226 #yiv3948813226ygrp-mkp #yiv3948813226ads {margin-bottom:10px;}#yiv3948813226 #yiv3948813226ygrp-mkp .yiv3948813226ad {padding:0 0;}#yiv3948813226 #yiv3948813226ygrp-mkp .yiv3948813226ad p {margin:0;}#yiv3948813226 #yiv3948813226ygrp-mkp .yiv3948813226ad a {color:#0000ff;text-decoration:none;}#yiv3948813226 #yiv3948813226ygrp-sponsor #yiv3948813226ygrp-lc {font-family:Arial;}#yiv3948813226 #yiv3948813226ygrp-sponsor #yiv3948813226ygrp-lc #yiv3948813226hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv3948813226 #yiv3948813226ygrp-sponsor #yiv3948813226ygrp-lc .yiv3948813226ad {margin-bottom:10px;padding:0 0;}#yiv3948813226 #yiv3948813226actions {font-family:Verdana;font-size:11px;padding:10px 0;}#yiv3948813226 #yiv3948813226activity {background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}#yiv3948813226 #yiv3948813226activity span {font-weight:700;}#yiv3948813226 #yiv3948813226activity span:first-child {text-transform:uppercase;}#yiv3948813226 #yiv3948813226activity span a {color:#5085b6;text-decoration:none;}#yiv3948813226 #yiv3948813226activity span span {color:#ff7900;}#yiv3948813226 #yiv3948813226activity span .yiv3948813226underline {text-decoration:underline;}#yiv3948813226 .yiv3948813226attach {clear:both;display:table;font-family:Arial;font-size:12px;padding:10px 0;width:400px;}#yiv3948813226 .yiv3948813226attach div a {text-decoration:none;}#yiv3948813226 .yiv3948813226attach img {border:none;padding-right:5px;}#yiv3948813226 .yiv3948813226attach label {display:block;margin-bottom:5px;}#yiv3948813226 .yiv3948813226attach label a {text-decoration:none;}#yiv3948813226 blockquote {margin:0 0 0 4px;}#yiv3948813226 .yiv3948813226bold {font-family:Arial;font-size:13px;font-weight:700;}#yiv3948813226 .yiv3948813226bold a {text-decoration:none;}#yiv3948813226 dd.yiv3948813226last p a {font-family:Verdana;font-weight:700;}#yiv3948813226 dd.yiv3948813226last p span {margin-right:10px;font-family:Verdana;font-weight:700;}#yiv3948813226 dd.yiv3948813226last p span.yiv3948813226yshortcuts {margin-right:0;}#yiv3948813226 div.yiv3948813226attach-table div div a {text-decoration:none;}#yiv3948813226 div.yiv3948813226attach-table {width:400px;}#yiv3948813226 div.yiv3948813226file-title a, #yiv3948813226 div.yiv3948813226file-title a:active, #yiv3948813226 div.yiv3948813226file-title a:hover, #yiv3948813226 div.yiv3948813226file-title a:visited {text-decoration:none;}#yiv3948813226 div.yiv3948813226photo-title a, #yiv3948813226 div.yiv3948813226photo-title a:active, #yiv3948813226 div.yiv3948813226photo-title a:hover, #yiv3948813226 div.yiv3948813226photo-title a:visited {text-decoration:none;}#yiv3948813226 div#yiv3948813226ygrp-mlmsg #yiv3948813226ygrp-msg p a span.yiv3948813226yshortcuts {font-family:Verdana;font-size:10px;font-weight:normal;}#yiv3948813226 .yiv3948813226green {color:#628c2a;}#yiv3948813226 .yiv3948813226MsoNormal {margin:0 0 0 0;}#yiv3948813226 o {font-size:0;}#yiv3948813226 #yiv3948813226photos div {float:left;width:72px;}#yiv3948813226 #yiv3948813226photos div div {border:1px solid #666666;min-height:62px;overflow:hidden;width:62px;}#yiv3948813226 #yiv3948813226photos div label {color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}#yiv3948813226 #yiv3948813226reco-category {font-size:77%;}#yiv3948813226 #yiv3948813226reco-desc {font-size:77%;}#yiv3948813226 .yiv3948813226replbq {margin:4px;}#yiv3948813226 #yiv3948813226ygrp-actbar div a:first-child {margin-right:2px;padding-right:5px;}#yiv3948813226 #yiv3948813226ygrp-mlmsg {font-size:13px;font-family:Arial, helvetica, clean, sans-serif;}#yiv3948813226 #yiv3948813226ygrp-mlmsg table {font-size:inherit;font:100%;}#yiv3948813226 #yiv3948813226ygrp-mlmsg select, #yiv3948813226 input, #yiv3948813226 textarea {font:99% Arial, Helvetica, clean, sans-serif;}#yiv3948813226 #yiv3948813226ygrp-mlmsg pre, #yiv3948813226 code {font:115% monospace;}#yiv3948813226 #yiv3948813226ygrp-mlmsg * {line-height:1.22em;}#yiv3948813226 #yiv3948813226ygrp-mlmsg #yiv3948813226logo {padding-bottom:10px;}#yiv3948813226 #yiv3948813226ygrp-msg p a {font-family:Verdana;}#yiv3948813226 #yiv3948813226ygrp-msg p#yiv3948813226attach-count span {color:#1E66AE;font-weight:700;}#yiv3948813226 #yiv3948813226ygrp-reco #yiv3948813226reco-head {color:#ff7900;font-weight:700;}#yiv3948813226 #yiv3948813226ygrp-reco {margin-bottom:20px;padding:0px;}#yiv3948813226 #yiv3948813226ygrp-sponsor #yiv3948813226ov li a {font-size:130%;text-decoration:none;}#yiv3948813226 #yiv3948813226ygrp-sponsor #yiv3948813226ov li {font-size:77%;list-style-type:square;padding:6px 0;}#yiv3948813226 #yiv3948813226ygrp-sponsor #yiv3948813226ov ul {margin:0;padding:0 0 0 8px;}#yiv3948813226 #yiv3948813226ygrp-text {font-family:Georgia;}#yiv3948813226 #yiv3948813226ygrp-text p {margin:0 0 1em 0;}#yiv3948813226 #yiv3948813226ygrp-text tt {font-size:120%;}#yiv3948813226 #yiv3948813226ygrp-vital ul li:last-child {border-right:none !important;}#yiv3948813226

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

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