Re: Q501 burnt?
"ei9feb" <[email protected]> Sat, 07 May 2011 20:54:26 -0000
| Newsgroups | gmane.recreation.radio.hardware.yaesu.vr-500 |
|---|---|
| Message-ID | <[email protected]> |
--5V06l2bnE8AdGl5kdMJOLz7YjToBSpneldpoxY2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable --- In [email protected], "ei9feb" <watty@...> wrote: > > I think it's Q501 (looking at Alignment PCB overlay as I have no schemati= c or service manual). > Top edge connected to aerial via surface mount part that looks like induc= tor. >=20 > Only 1/2 of it there and the track at one pin burnt away. >=20 > I replaced that track with a fine wire to the resistor nearby. >=20 > I replaced the burnt part with surface mount dual diode, as I think logic= ally that is what it must be. Anyone know is this right? >=20 > I'm guessing I connected it via un-isolated T to a box powered over coax = as there is no DC blocking capacitor there? > I found the FCC zip file (might have been in the archives here, unlabelled)= . So indeed the "blown up" part at aerial is a pair of diodes wired back to= back. The FCC file with poor schematics is here too http://www.techtir.ie= /radio/yaesu_vr500 plus photos of a repaired VR500 --5V06l2bnE8AdGl5kdMJOLz7YjToBSpneldpoxY2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> </head> <body style="background-color: #fff;"> <span style="display:none"> </span> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id="ygrp-mlmsg" style="position:relative;"> <div id="ygrp-msg" style="z-index: 1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id="ygrp-text" > <p><br> <br> --- In <a href="mailto:VR-500%40yahoogroups.com">[email protected]</a>, "ei9feb" <watty@...> wrote:<br> ><br> > I think it's Q501 (looking at Alignment PCB overlay as I have no schematic or service manual).<br> > Top edge connected to aerial via surface mount part that looks like inductor.<br> > <br> > Only 1/2 of it there and the track at one pin burnt away.<br> > <br> > I replaced that track with a fine wire to the resistor nearby.<br> > <br> > I replaced the burnt part with surface mount dual diode, as I think logically that is what it must be. Anyone know is this right?<br> > <br> > I'm guessing I connected it via un-isolated T to a box powered over coax as there is no DC blocking capacitor there?<br> ><br> <br> I found the FCC zip file (might have been in the archives here, unlabelled). So indeed the "blown up" part at aerial is a pair of diodes wired back to back. The FCC file with poor schematics is here too <a href="http://www.techtir.ie/radio/yaesu_vr500">http://www.techtir.ie/radio/yaesu_vr500</a> plus photos of a repaired VR500<br> <br> </p> </div> <!--~-|**|PrettyHtmlStart|**|-~--> <div style="color: #fff; height: 0;">__._,_.___</div> <div id="ygrp-actbar" style="clear: both; margin-bottom: 10px; white-space: nowrap; color: #666; padding-top: 15px;"> <div> <a href="mailto:[email protected]?subject=Re%3A%20Q501%20burnt%3F" style="margin-right: 0; padding-right: 0;"> Reply to <span style="font-weight: 700;">sender</span></a> | <a href="mailto:[email protected]?subject=Re%3A%20Q501%20burnt%3F"> Reply to <span style="font-weight: 700;">group</span></a> | <a href="http://groups.yahoo.com/group/VR-500/post;_ylc=X3oDMTJvbmF1dm5tBF9TAzk3MzU5NzE0BGdycElkAzE3Mjk4NwRncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDMzY0MgRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEzMDQ4MDIxMTE-?act=reply&messageNum=3642">Reply <span style="font-weight: 700;">via web post</span></a> | <a href="http://groups.yahoo.com/group/VR-500/post;_ylc=X3oDMTJkMG5xdXMyBF9TAzk3MzU5NzE0BGdycElkAzE3Mjk4NwRncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDbnRwYwRzdGltZQMxMzA0ODAyMTEx" style="font-weight: 700;">Start a New Topic</a> </div> <a href="http://groups.yahoo.com/group/VR-500/message/3637;_ylc=X3oDMTMzbDgwYm0wBF9TAzk3MzU5NzE0BGdycElkAzE3Mjk4NwRncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDMzY0MgRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzEzMDQ4MDIxMTEEdHBjSWQDMzYzNw--">Messages in this topic</a> (<span style="font-weight: 700;">2</span>) </div> <!------- Start Nav Bar ------> <!-- |**|begin egp html banner|**| --> <div id="ygrp-vital" style="background-color: #e0ecee; font-family: Verdana; font-size: 10px; margin-bottom: 10px; padding: 10px;"> <span id="vithd" style="font-weight: bold; color: #333; text-transform: uppercase; ">Recent Activity:</span> <ul style="list-style-type: none; margin: 0; padding: 0; display: inline;"> <li style="border-right: 1px solid #000; font-weight: 700; display: inline; padding: 0 5px; margin-left: 0;"> <span class="cat"><a href="http://groups.yahoo.com/group/VR-500/members;_ylc=X3oDMTJldGFybnFlBF9TAzk3MzU5NzE0BGdycElkAzE3Mjk4NwRncnBzcElkAzE3MDUwNjMxMDgEc2VjA3Z0bARzbGsDdm1icnMEc3RpbWUDMTMwNDgwMjExMQ--?o=6" style="text-decoration: none;">New Members</a></span> <span class="ct" style="color: #ff7900;">1</span> </li> </ul> <div style="clear: both; padding-top: 2px; color: #1e66ae;"> <a href="http://groups.yahoo.com/group/VR-500;_ylc=X3oDMTJkNXVmN3VzBF9TAzk3MzU5NzE0BGdycElkAzE3Mjk4NwRncnBzcElkAzE3MDUwNjMxMDgEc2VjA3Z0bARzbGsDdmdocARzdGltZQMxMzA0ODAyMTEx" style="text-decoration: none;">Visit Your Group</a> </div> </div> <div id="ygrp-grft" style="font-family: Verdana; font-size: 12px; padding: 15px 0;"> <!-- |**|begin egp html banner|**| --> Post message: [email protected] <BR> Subscribe: [email protected] <BR> Unsubscribe: [email protected] <BR> List owner: [email protected] <BR> <BR> <BR> <BR> <BR> <BR> Ejoy the list!! <!-- |**|end egp html banner|**| --> </div> <div id="ygrp-mkp" style="border: 1px solid #d8d8d8; clear: both; float: left; font-family: Arial; margin: 5px 0 10px 0; padding: 0 10px;"> <div id="hd" style="color: #628c2a; font-size: 85%; font-weight: 700; line-height: 122%; margin: 10px 0;">MARKETPLACE</div> <div id="ads" style="margin-bottom: 10px;"> <div class="ad" style="color: #628C2A; font-family: Arial; font-weight: 700; padding: 0 0;"> <p><a href="http://global.ard.yahoo.com/SIG=15om3e165/M=493064.14543979.14365478.13298430/D=groups/S=1705063108:MKP1/Y=YAHOO/EXP=1304809311/L=3b5c872a-78ed-11e0-b108-4ff6e0663195/B=h7goTdBDRvQ-/J=1304802111980481/K=_fHFPp.wLT7dHRffsDd.Rw/A=6060255/R=0/SIG=1194m4keh/*http://us.toolbar.yahoo.com/?.cpdl=grpj">Stay on top of your group activity without leaving the page you're on - Get the Yahoo! 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