| Electronics > Repair |
| HP-8569 Spectrum Analyzer Repairs |
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| AF6LJ:
Hardware from the bandwidth switch assembly. You should have all this. for that switch plus the rotor and spring. Here is the front view of the frequency span switch, note the position of our witness mark to the pin on the brass collar. also note the spring in its cup. Here are the pieces from the frequency span switch. You can add a witness mark to locate the pin position, or simply remember it is in the center of the rotor stop block. Moving on....... Next post........... |
| AF6LJ:
In the above picture you can see the top side of the switch rotor. One set of contacts remain, the outside set has fallen off and these can be found inside of the analyzer if you are careful it can be recovered. Above you will see the components from the frequency span switch. A collar that is held in place with a spring clip the spring, ball, spacers, screws, detent, and shaft. The missing contact finger set was recovered when the analyzer was opened. Here you can see where the missing contact finger set goes. We will go into reattachment in a later post, I have to deal with other obligations for the next few days. Any questions post them and I will answer them as I visit this site several times a day. |
| xrunner:
Great pics I'm sure they will help someone someday. :-+ |
| AF6LJ:
--- Quote from: xrunner on January 04, 2018, 11:08:37 pm ---Great pics I'm sure they will help someone someday. :-+ --- End quote --- Thee is an individual who has contacted me about the same repair, he may or may not post in this thread. If he does he will want to start his reccmonded reading on page 8-25 of volume three of the manual. |
| AF6LJ:
So after fending off life's oblations I now have a few hours to work on the switch rotor repair. Using my Redneck engineering talents I rigged up a holding fixture for the switch rotor. What I did next was to practice holding and landing the switch contact fingers in the proper position. (Keep a reasonable distance from the coffee pot before attaching these contacts.) A bottle of CA glue was opened and a test drop applied to the body of the fixture to prime the spout... Then a drop was applied to the location where the contacts would be attached, the bottle sealed and the contacts which were preloaded into tweezers were applied and held in position for two minutes. Tomorrow afternoon the surface of the glue joint will be scuffed and lightly cleaned. Epoxy will be applied to the joint to reinforce the joint, and provide enough bonding straight to allow for reassembly of the front panel module and installation this weekend. |
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