I finally decided to go down the rabbit hole of the 3585a. Mine was giving me a trouble where it would boot up and give me a calibration error saying ¡°error 02¡± and it USED to give waveform outputs that looked like this;
Now, (months later once I finally got around to the project) it is not displaying any signal at all. It just displays the noise floor. There is no signal at 0Hz anymore, However I can see signal Spurs when the range Auto Range is being changed.
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Upon further investigation, it seems like the calibration error is due to the input section not detecting the 10MHz cal signal. From the steps that I took in the service guide, it's telling me that the issue lies within A17 Q1, Q2, Q3 or Q6. This testing was done with an external 10MHz reference input because while I was testing I also found the following,
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Yellow is the 10MHz REF output.
Purple is the internal OVEN REF output.
When I apply a 10MHz 5Vpp signal into the EXT REF IN (where the oven would normally connect to), the 10MHz output (Yellow) does not change at all.
So it would appear that I have three errors here and I am a bit stumped.
- It is unable to detect any signals anymore?
- The internal oven has no output?
- The 10MHz output looks super wonky and does not change regardless if there is a 10MHz EXT REF IN?or not.
I'm not necessarily looking for answers because I know this is extremely difficult to remote troubleshoot but if anybody has it any ideas or has seen anything like these before, please let me know!
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