| Electronics > Repair |
| HP-8569 Spectrum Analyzer Repairs |
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| AF6LJ:
--- Quote from: xrunner on March 27, 2017, 09:58:44 pm --- --- Quote from: AF6LJ on March 27, 2017, 07:09:55 pm ---I think that might be overkill, and I think I have found the right formula to make this happen. --- End quote --- Yea but my middle name is Overkill, that's what I'm known for LOL. ;) --- Quote ---If Keysight had the parts I would consider ordering them. --- End quote --- I bet you would be horrified at the cost though, even for that small part. I got an Agilent E4411B Spectrum Analyzer last year - great unit. It's B&W, but it actually can display colors if you go into the right menu and change all the assignments for traces and this and that different colors. Takes a while. 'Cept the problem is it won't store all those colors and next time you turn it on - it's back to B&W. I looked at what it would take to make it remember the colors. It takes a firmware upgrade - but to do that you have to get the software from Keysight, and then before that, you must upgrade the memory, and to do that would cost somewhere between $1k and $2k. All to make it display colors. The thing didn't even cost me that much. Grrrr. --- End quote --- I love overkill, I just don't have the money for this project... I am sure their parts carry a high degree of pride, therefore they most likely sell $5.00 panel screws... I have penetrating oil in the set screws of two knobs.... Hopefully tomorrow they will break free. |
| Radio Tech:
Looks like a lot of mechanical repairs are in the process Sue. :-+ I hate those hot stakes the HP uses in their older equipment. My HP 8640B had the same issue but was on a set of gears that were clear on color. Since I have been into RC planes for 30 years and had a supply of micro hardware I was able to drill mine and use a nut and tap to hold the fingers in place. But there was a major problem. I had no fingers left to bolt on. So I made them from scratch by using the contacts arms from a relay. Was a lot of work. Will be keeping an eye on your project. |
| AF6LJ:
I think I have enough parts to make two of them work. If not I will improvise. I'm going to have to see if I can talk Pat into a trip to Apex... You may have seen Dave's video on that place.... It's Disneyland for our kind of folk. :) |
| AF6LJ:
Time to get back to work... The removal of the reference level and attenuator switches are well explained in the manual. The 0-11DB fine level control leads are unsoldered. This stop mounted on the IF gain shaft stays in place. From here on out the disassembly is straight forward. Input Attenuator contacts. IF gain contacts Okay parts to clean up and time to start gluing contacts in place. More to follow in the upcoming days. |
| AF6LJ:
Work can continue, we have two usable rotors, this analyzer can be assembled without any major component level rework. The old dowel pin was removed and installed in the attenuator rotor They are ready for installation.... Time for a break and later today clean up will begin on the old parts. The PCB has some contact cleaner residue that will be removed with denatured alcohol. The only items that need grease are the detent ball and spring. |
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