HP-8569 Spectrum Analyzer Repairs

[AF6LJ]

The front panel module is assembled and all that need be done is clean off a little flux.





After I clean up my bench tomorrow we shall do a tear down and inspection.

Stay Tuned..............

[xrunner]

Stay Tuned..............

Oh yea! I remember that green accent for certain buttons. And the gold traces too. Man I can't wait to see it in operation! 

[bitseeker]

I am properly tuned to this channel.

[AF6LJ]

I am properly tuned to this channel.

Getting close to the end of this project.
Pictures to come, I had to work over the Reference level control group and I have it properly aligned now and am engaged in reassembly of the front panel module.
Getting those hubs aligned properly is challenging but I finally have the knob engaging the input attenuator properly and returning to it's home position in the IF Gain rotor.

Stay Tuned............

[Radio Tech]

Exciting.... 

[AF6LJ]

It's up and running, pictures coming soon....

[AF6LJ]

It took some doing but I finally got the reference level switch and the attenuator to work well together.



Tear Down Pics coming..

[AF6LJ]

Tear Down pics...
I won't comment too much the board IDs are etched on the boards.
So here goes...

Mixer and YIGs are in the lower left..




High Voltage and deflection...


Everything is well labeled.




Main power supply...


Input attenuator in the upper left, relays for signal switching and lots of plumbing.

[AF6LJ]

CPU board the 6502 in the upper left...

[AF6LJ]

Sorry...
I think that is all of them.

[xrunner]

Beautiful green display - and look at all the blue pots! 

Great work!

[AF6LJ]

There ya go 65 Pounds of LOVE

[bitseeker]

Wow, quite a row of cans in the power supply, and trimmers on the current sensing board. Lots of neat stuff in there. Congrats on the repairs, Sue.

[tautech]

Isn't it great to see so few polarised timebombs caps on PCB's. 
Might just see you out girl. 

[AF6LJ]

Wow, quite a row of cans in the power supply, and trimmers on the current sensing board. Lots of neat stuff in there. Congrats on the repairs, Sue.

There are two boards in there one with the most pots on it controls the YIG tuned oscillator.
The other one os for the YIG preselector.

[VK5RC]

Lovely work on a lovely machine - long may she reign!

[rdkrco]

I also want to buy one of those rotor contact "fingers" if a source can be found. Otherwise I may buy an entire broken HP vintage Spectrum Analyzer just for the rotor contact fingers.

[Radio Tech]

So nice to see it come together Sue. Really nice work you performed on this unit.

 

[AF6LJ]

I also want to buy one of those rotor contact "fingers" if a source can be found. Otherwise I may buy an entire broken HP vintage Spectrum Analyzer just for the rotor contact fingers.

Until I realized I had enough I was looking at finger stock over at Mouser, and found some viable candidates.


To Everyone else thanks for the kind replies.

[cncjerry]

what's with all those pots on that one board?  looks like it would be a real hassle to align.  Nice job by the way.

[AF6LJ]

what's with all those pots on that one board?  looks like it would be a real hassle to align.  Nice job by the way.

That is to set the current going into the YIG osciallator tuning coil...
All those pots make for a linear change in frequency...
It is a current shaping network.

[WastelandTek]

oh man, when I heard about the photobucket fiasco I knew there would be really important threads that ended up like this

    

[bitseeker]

Sadness, indeed. 

[AF6LJ]

I'm not real happy about this, and will start using the Google Photos page...
I have another ongoing project over on the QRZ forums and Google photos will let you link to your photos.

[WastelandTek]

I'm not real happy about this

yeah, I bet

I am so sorry Sue.  I know it is a lot of work, but are you planning to relink the thread?  These kinds of threads are sooooo useful for people later trying to fix similar gear.