Author Topic: HP-8569 Spectrum Analyzer Repairs  (Read 35904 times)

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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #50 on: May 04, 2017, 02:36:02 am »
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..............

Sue AF6LJ
 
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Online xrunner

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #51 on: May 04, 2017, 02:39:11 am »
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!  :-+
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Offline bitseeker

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #52 on: May 04, 2017, 06:40:22 pm »
I am properly tuned to this channel.
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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #53 on: May 04, 2017, 06:44:51 pm »
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............
Sue AF6LJ
 

Offline Radio Tech

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #54 on: May 04, 2017, 11:46:10 pm »
Exciting....  :-+

Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #55 on: May 04, 2017, 11:46:50 pm »
It's up and running, pictures coming soon....
Sue AF6LJ
 

Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #56 on: May 04, 2017, 11:54:27 pm »
It took some doing but I finally got the reference level switch and the attenuator to work well together.



Tear Down Pics coming..
Sue AF6LJ
 
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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #57 on: May 05, 2017, 12:06:56 am »
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.
Sue AF6LJ
 
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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #58 on: May 05, 2017, 12:09:59 am »







CPU board the 6502 in the upper left...





Sue AF6LJ
 
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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #59 on: May 05, 2017, 12:13:34 am »



















Sorry...
I think that is all of them.
Sue AF6LJ
 
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Online xrunner

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #60 on: May 05, 2017, 12:15:09 am »

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

Great work!
I told my friends I could teach them to be funny, but they all just laughed at me.
 

Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #61 on: May 05, 2017, 12:15:42 am »
There ya go 65 Pounds of LOVE :)
Sue AF6LJ
 

Offline bitseeker

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #62 on: May 05, 2017, 12:16:01 am »
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.
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Offline tautech

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #63 on: May 05, 2017, 12:22:51 am »
Isn't it great to see so few polarised timebombs caps on PCB's.  :-+
Might just see you out girl.  ;)
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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #64 on: May 05, 2017, 02:59:24 am »
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.
Sue AF6LJ
 

Offline VK5RC

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #65 on: May 07, 2017, 03:48:29 am »
Lovely work on a lovely machine - long may she reign!
Whoah! Watch where that landed we might need it later.
 
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Offline rdkrco

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #66 on: May 07, 2017, 03:46:51 pm »
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.
 

Offline Radio Tech

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #67 on: May 07, 2017, 06:07:30 pm »
So nice to see it come together Sue. Really nice work you performed on this unit.

 :-+ :-+

Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #68 on: May 07, 2017, 06:48:08 pm »
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.
Sue AF6LJ
 

Offline cncjerry

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #69 on: May 08, 2017, 06:31:12 pm »
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.
 

Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #70 on: May 08, 2017, 09:42:38 pm »
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.
Sue AF6LJ
 

Offline WastelandTek

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #71 on: July 14, 2017, 12:12:11 am »
oh man, when I heard about the photobucket fiasco I knew there would be really important threads that ended up like this

 :'(  :'(  :'(
I'm new here, but I tend to be pretty gregarious, so if I'm out of my lane please call me out.
 

Offline bitseeker

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #72 on: July 14, 2017, 09:48:13 pm »
Sadness, indeed.  :'(
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Offline AF6LJTopic starter

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #73 on: July 16, 2017, 02:15:45 pm »
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.
Sue AF6LJ
 
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Offline WastelandTek

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Re: HP-8569 Spectrum Analyzer Repairs
« Reply #74 on: July 16, 2017, 04:24:55 pm »
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.
I'm new here, but I tend to be pretty gregarious, so if I'm out of my lane please call me out.
 
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