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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack

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Jwalling:

--- Quote from: free_electron on July 10, 2017, 02:37:58 pm ---here is the clip you need to press.

--- End quote ---

You can't. the CH3/4 attenuator assy. covers those.

nctnico:

--- Quote from: Jwalling on July 10, 2017, 02:45:49 pm ---
--- Quote from: free_electron on July 10, 2017, 02:37:58 pm ---here is the clip you need to press.

--- End quote ---
You can't. the CH3/4 attenuator assy. covers those.

--- End quote ---
Indeed but it seems to vary between the models. The attenuators in my one are fully enclosed in (bulky) metal shielding so there is no way I can get to the clips.

Jwalling:

--- Quote from: nctnico on July 10, 2017, 02:58:23 pm ---
--- Quote from: Jwalling on July 10, 2017, 02:45:49 pm ---
--- Quote from: free_electron on July 10, 2017, 02:37:58 pm ---here is the clip you need to press.

--- End quote ---
You can't. the CH3/4 attenuator assy. covers those.

--- End quote ---
Indeed but it seems to vary between the models. The attenuators in my one are fully enclosed in (bulky) metal shielding so there is no way I can get to the clips.

--- End quote ---

Exactly. The dual attenuators on the 54835A/45A cover them. On the 54825A and lower, they may be accessible since there's 4 separate ones.

nctnico:
Time for an update. On the PC part I added another 256MB (I bought 3 memory modules so why not) and disabled swap (virtual memory).

More importantly I received the replacement ADC hybrid today. After swapping it the self tests pass and channel 1 works so now I have 4 working channels. Woohoooo! Time to put everything together!

I bought some standard HP feet with tilt stands but I quickly found out the 54835A uses different feet. I tried to find the right feet on Ebay but couldn't so time to pull out the drill press and drill some extra holes to hold the most common HP feet:








The end result (200MHz signal with FM modulation):


What is interesting is that the probe interface board shows a lot of use on channel 1, a little bit on channel 2 and none on channel 3 and 4. Also the attenuator relay count is very low. Around 4000 on channel 1 and around 2000 on the other channels.

alm:
Thanks for the update. Great that replacing the hybrid turned out to be a complete fix (which was like 90% likely, but you never know until you try it).

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