| Electronics > Repair |
| HP-8569 Spectrum Analyzer Repairs |
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| AF6LJ:
I am finishing off a project now that is taking up a lot of valuable bench space. (Heathkit HL-2200 linear amplifier). This amplifier has been giving me fits on the ten meter band. Looks like I have a bad input circuit cap, parts ordered and soon enough this project will be done. Status Update; We left off with the sweep time knob being stuck on the shaft. This was stopping the removal of the front panel dress plate. and the rest of the rebuild process of the second front panel. I picked up two left hand drill bits and a 4-40 (right hand) tap) I was able to free up the hex head set screws in the knob, with the threads in the knob insert suffering little or no damage. SO... This repair will begin with the remaining disassembly of the front panel module. I have learned a few things from the assembly of the last front panel module and this one should go with a minimum of rework to get things to align up right. Here is a sample of what is in store And the back side.... These were taken from the first rebuild. I do need to get the picture size down to something like 1024 X 768.... |
| bitseeker:
Interesting mechanicals back there. I wonder when 3D printing will become a staple of the bench to keep these vintage instruments going. |
| AF6LJ:
Quote from: bitseeker on Today at 12:02:51 PM Interesting mechanicals back there. I wonder when 3D printing will become a staple of the bench to keep these vintage instruments going. --- End quote --- The knobs are fragile, but the switch rotors inside are robust. The problem is the little metal contacts get lost. I would love to find a source for those little contact fingers. |
| bitseeker:
Yeah, not so easy replacing little metal bits of various kinds. I suppose one could learn to work with spring steel, but I have no idea what that involves to cut, form, etc. |
| WastelandTek:
are there pics up there that I am not resolving for some reason? |
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