Electronics > Repair
HP-8569 Spectrum Analyzer Repairs
AF6LJ:
--- Quote from: VK5RC on December 08, 2017, 07:46:32 am ---I have a friend who is a dentist, he is a glue and material 'king', some wisdom he passed on was that he often uses a tiny sand blaster (about pencil sized) to lightly etch materials before gluing.
--- End quote ---
You almost have to ether chemically etch or manually etch the surface if you want success with glues. Making the surface a little tacky also helps.
AF6LJ:
Work has begun on the second HP-8569B front panel module. This one isn't as bad off as the last one, I think there is only one switch contact assembly that needs repair.
As you remember I had to drill out the two set screws in the sweep time / div knob and chase the threads with a 4-40 tap.
Today I have removed the PCB assemblies from the front panel plate and removed the dress plate.
So here is where we are at.
On this unit the Frequency span switch is missing a set of contacts. This requires the rotary switch on the right must be completely taken apart and the rotor prepared to have the switch contact (I managed to save several) glued in place.
With that switch removed I can inspect the input atten., and IF gain switches for missing contacts. There is an issue with the vernier knob, the pot works but the on screen readout isn't working reliably. The contacts for the rotary encoder are there, my thoughts are some adjustment of the wheel that holds the contacts may be in order.
More tomorrow, I need to dig the boxes of parts from the other front panels out of storage.
Be prepared for lots of fresh pictures.
xrunner:
Cool - pics are good eye candy. :-+
WastelandTek:
does anyone know which script is associated with these pics...I'm not resolving them and the rest of the site works fine
AF6LJ:
I am using FireFox and they look fine.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version