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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
Converter:
I hope this was not unexpected for you? You have already seen the posts about the same unsuccessful attempts?
https://www.eevblog.com/forum/testgear/agilent-54835a-scope-(4-channel-1ghz-4gss)-repair-uphack/msg1347104/#msg1347104
https://www.eevblog.com/forum/testgear/agilent-54835a-scope-(4-channel-1ghz-4gss)-repair-uphack/msg1347123/#msg1347123
https://www.eevblog.com/forum/testgear/agilent-54835a-scope-(4-channel-1ghz-4gss)-repair-uphack/msg1348009/#msg1348009
--- Quote ---Here you can see how close the dent in the aluminum frame came to breaking the acq. board, luck was on my side here:
--- End quote ---
And you can easily fix it. Simply use a hard, even base and some flat rectangles on the other side and hammer to align the dent. I often have to fix this.
alpher:
Of course I've seen them, but the more data we have the better chances of successful hack,
Obviously now we know that there are some differences between 846 and 845 attenuators.
So someone with access to both types can find out the differences.
alpher:
--- Quote ---
--- Quote ---Here you can see how close the dent in the aluminum frame came to breaking the acq. board, luck was on my side here:
--- End quote ---
And you can easily fix it. Simply use a hard, even base and some flat rectangles on the other side and hammer to align the dent. I often have to fix this.
--- End quote ---
That's exactly what I did:
Converter:
Believe me, this is all easily corrected. I came across more complex cases. Simply place another small flat bar at the height you want. I use ground metal parts. But you need to be very careful, because you can create new dents :). Before this, do not forget to remove all boards from the chassis.
Update: Now I see on your new photos that you have already successfully corrected everything. Congratulations.
Krzys:
--- Quote from: alpher on March 24, 2019, 05:57:18 pm ---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.
--- End quote ---
What do you mean by "BiOS sees the CD drive no problem"? Do you mean that autodetection detects CD drive?
By default, only first IDE channel is enabled in WinBios setup - you need to enable both in Peripherals. (And it is being reset to defaults on each change that prompts you to enter the BIOS - for example on memory size change. Quite annoying.)
Even though secondary IDE channel is disabled in WinBios setup, BIOS could autodetect devices on that channel - but it wouldn't work anyway.
Edit: I'm probably wrong about autodetection always working, as today it detected no drive - it turned out that the setting for IDE channels was set to "None". Autodetection started working just after changing it to "Both", saving settings and reboot. It seems inconsistent to what I've observed while trying to connect CD drive previously. (OTOH Windows 95 recognized both channels just fine.)
I don't know if enabling secondary IDE channel is enough to see it in Windows.
Also please note that some CD drives might not work.
In my case I've tried some PATA laptop DVD drives. First one ("modern", DVD-RW, Sony NEC Optiarc AD-7563A from 2008, rated 1,5A) , was detected as secondary slave (my desktop IDE <-> laptop CD adapter has no jumpers), but it wasn't working (at least it was not possible to boot from it).
Second one - old 20x/2x DVD-ROM (Panasonic SR-8171C, from 1998 (yay!), specc'd at 1,8A) was detected as primary master and worked just fine - I've went through full Windows XP repair install with it.
As for +5V power supply, I've used Vcc and ground from USB connector. Somehow it was enough.
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