| Electronics > Repair |
| HP-8569 Spectrum Analyzer Repairs |
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| mmagin:
--- Quote from: AF6LJ on March 22, 2017, 04:03:36 pm ---I do plan on exploring the possiability of using both glue and a small screw to anchor the contact fingers in place. Anybody know where I can get more of those fingers???? --- End quote --- Some of the high temperature hot-melt adhesives are amazing (and will stick to a lot of things), though you have to be careful when applying them to plastics with lower melting points (polyethylene, polypropylene, etc). Nylon may be okay, I dunno. |
| cncjerry:
two options: 1) Put the fingers on the posts and melt them around it with a soldering iron. Find some of the excess material and use it as filler mixing it around with heat. 2) Send the delrin/nylon material parts to me and I will drill them for you for the cost of return postage. Then use two small screws to hold them down. |
| AF6LJ:
--- Quote from: cncjerry on March 22, 2017, 06:12:45 pm ---two options: 1) Put the fingers on the posts and melt them around it with a soldering iron. Find some of the excess material and use it as filler mixing it around with heat. 2) Send the delrin/nylon material parts to me and I will drill them for you for the cost of return postage. Then use two small screws to hold them down. --- End quote --- I am going to give option two serious consideration. |
| AF6LJ:
Today I did a test drill in the one rotor I had already removed, I think I am going to drill, tap and install 0-80 retaining screws on the switch contacts that I can, a dab of Epoxy will secure the screw head to the edge of the contact base... This should work... Here is one of the good ones I pulled from the same module I am working over.. These contacts are working loose as can bee seen below. For those who may not be sure how these switches work the contacts slide across the plated tracks on the circuit board. On the left as seen above is the resolution bandwidth stationary contacts, the broken rotor and contact assembly came from that switch. The switch on the right is the sweep selector switch contacts. The wide contact in the center is the ground contact. |
| xrunner:
Looks good so far. Maybe put a smidgen of epoxy on the pair that are loose too. Good work. |
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