| Products > Test Equipment |
| Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack |
| << < (56/80) > >> |
| Converter:
I think you should not worry. I, too, had it during the first boot, but I never saw any further problems during use. |
| alpher:
You're right, I'm going to leave it as it is for now, just try to update to 4.5 tomorrow. Bsods started after at the point windows asked me to choose drive for some intel ide controller, there were 2 choices some intel number and a generic one. Choose intel and bang bsod and hard lock >:( , had to power cycle, after that had around 3 more bsods an had to powercycle twice or trice. Wonder if I had chosen the generic controller things may have gone more smoothly :-// I'll try it on the final board that I'm getting from a guy from Ukraine from all places, funny. :) :) Thank you Converter for all you'r help. |
| alpher:
Just a quick update,wasn't able to update software to ver4.5 yet, somehow second IDE chanel doesn't even show up when the OS starts, BiOS sees the CD drive no problem, but in windows device manager there is only the primary IDE. I think I'm gonna wait for the 810 mobo before I try again, my idea now is to edit the GHO image, add a directory containing the 4.5 update and then use "subst" command in windows command prompt to point drive a: to the directory, in theory it should work, we'll see how it does in practice :) :). In the meantime removed the acquisition board and the motherboard to some "bodywork" on the frame as mine came with a big dent in one of the back corners, luck has it didn't damage the acquisition board. :) Since I have the board out , may try the 54846 uphack, we'll see. When I removed the acq. board I noticed that the service manual mentions 9 torx screws to be removed, I counted 13 :) :), overall removal is really easy compared to other scopes I worked on recently. Here are some pics for the curious minds: Here you can see how close the dent in the aluminum frame came to breaking the acq. board, luck was on my side here: Wonder what material is the RF shield made of, is quite heavy could it be Lead ? |
| alpher:
846A uphack didn't work for me as well, immediately fails calibration on all 4 channels. Something else is at work here. Maybe for 54846s they use a specially graded acq. boards or attenuators? |
| alpher:
Just consulted service manual for these scopes, and the acq. boards have a different part numbers for 1.5 and 2.5GHz scopes, namely: A13 54845-69527 1 4-CH ACQUISITION ASSEMBLY W/ATTENUATORS (Agilent Model 54845A) A13 54846-69527 1 4-CH ACQUISITION ASSEMBLY W/ATTENUATORS (Agilent Model 54846A) Even more telling is this: A13A1 A13A2 54845-66502 2 2-CH ATTENUATOR ASSY (54835A and 54845A) A13A1 A13A2 54846-66502 2 2-CH ATTENUATOR ASSY (54846A) So even though the acq boards themselves may look the same, the attenuators are not. What's significant here is that while 835A and 845A share the same attenuator assemblies, and people report successful uphack from 835 to 845. The same is NOT true going from 845 to 846, since they have different attenuators, according to service manual at least. |
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