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Date
Re: 8702A service manual
Hello Wayne, I have an 8702A which IIRC is an 8753C with firmware to support the optical function by using the optical S parameter test set (which I do not have). Apparently one could mix optical and
By Sam Reaves · #145582 ·
Re: Conductive Paint for Microcircuit Repair...
I have the same kind of repair to do and have not found an acceptable solution. Would your paint work if a little extra solvent was added and mixed in? Peter
By Peter Gottlieb · #145581 ·
Re: Conductive Paint for Microcircuit Repair...
A form of silver print is what I used before, it came in little 1ml syringes. The problem is the solvent evaporates quickly enough that between dipping the one hair brush into the paint, and touching
By Chuck Harris · #145580 ·
Re: Conductive Paint for Microcircuit Repair...
I used to use General Cement Silver Print to repair conductive traces. I believe it was a lacquer with very fine silver particles in suspension. I don't know if it is still available, because my
By Michael A. Terrell · #145579 ·
Re: Conductive Paint for Microcircuit Repair...
Ok. I saw the arm-hair statement, but not the fact that that was the width of the trace. Thanks. DaveD KC0WJN ============================== All spelling mistakes are the responsibilty of the reader
By Dave Daniel · #145578 ·
Re: Conductive Paint for Microcircuit Repair...
As I stated in my original post, about 0.04mm, or one of my arm hairs. -Chuck Harris wrote:
By Chuck Harris · #145577 ·
Re: Conductive Paint for Microcircuit Repair...
What is the width of the flex cable trace under discussion? DaveD KC0WJN ============================== All spelling mistakes are the responsibilty of the reader (Rick Renz, STK, ca. 1994)
By Dave Daniel · #145576 ·
Re: Conductive Paint for Microcircuit Repair...
Hmmm? "Masking" tape is generally made of crepe paper that has crenulations that are bigger than my entire trace width. I suppose some kapton tape pieces could be arranged to make some sort of mask...
By Chuck Harris · #145575 ·
HP 8557A Start-Up Calibration & Linear Mode - Errors in Manual?
Hey y'all!? I was hoping to get some help or clarification on the start-up calibration procedure for the HP 8557A/8558B spectrum analyzer plug-in.? First, I did not get this unit in working order
By Frank Mashockie · #145574 ·
Re: Conductive Paint for Microcircuit Repair...
https://www.permatex.com/products/specialized-maintenance-repair/repair-kits/permatex-window-defogger-repair-kit/ Use masking tape to define your trace width. Dave Casey [email protected]> wrote:
By Dave Casey · #145573 ·
Conductive Paint for Microcircuit Repair...
Hi Gang, I need a workable conductive paint for use on repairing a really tiny flexible circuit board trace. Due to a flaw in manufacturing, a small bit (about the diameter of a human hair) of a
By Chuck Harris · #145572 ·
Re: 8702A service manual [SEC=UNOFFICIAL]
Yes I am getting that feeling. The 8702A uses a vector display and not RGB? like the later models. one of the Simmconn kits looks like it is the only way to go unless there are boards I can swap out
By Wayne Eckert · #145571 ·
Re: VNA calibration kit to 50 GHz
finding in addition that a 1-port Open, Short, Load (OSL) calibration is difficult in waveguide due to the problem of getting the Open, so this in waveguide seems to be replaced with SSL, where S=O= l
By neil · #145570 ·
Re: HP 83590A RF plugin EPROM image
Hi, The firmware for the 83590A I downloaded is not working I'm afraid. When installed the 8350B does not recognize the plugin and stops with a "E001" error. The first bytes of the firmware should
By Tony · #145569 ·
Re: HP 83590A - Help understanding frequency band switching
Hi Don, Yes, I've been going through the service manual reviewing both the theory of operation and detailed per-assembly explanations. Thanks for the confirmation re. Band 0/4. I'm still a bit puzzled
By Tony · #145568 ·
Re: 8702A service manual [SEC=UNOFFICIAL]
Found the service manual for the 8753, thanks ,didn't see anything regarding the video, will delve deeper into it today. One of the 8702's has arcing in the eht but haven't taken the covers off yet.
By Wayne Eckert · #145567 ·
Re: 8640B won't switch to highest +20 dBm range
Hello Dave, Your diagnosis suggests the attenuator knob and switch is out by one detent. 73 de Brian, VK2GCE
By Brian · #145566 ·
Re: 8640B won't switch to highest +20 dBm range
I had a problem on mine many years ago and found a bad reed relay, though my problem had to do with switching between the high and low halves of the frequency bands. There is a board with a bunch of
By John W Cress · #145565 ·
Re: 8640B won't switch to highest +20 dBm range
Hi:You can test the attenuator within the instrument. you can connect a SMA cable to attenuator input, check the level at N output connector . Test the attenuation correct or not. + 20dBm had a switch
By Yiu On Tony C · #145564 ·
Re: 8640B won't switch to highest +20 dBm range
Here is a weird idea: Has the power amp been bypassed or partly failed? I have worked on a few of these and never saw this. When you say wont switch: is the attenuator knob not set right, not sure I
By Jeff Kruth · #145563 ·