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| Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack |
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| TheSteve:
My 54845A arrived yesterday, picked it up and cracked it open today. Many of the cables were disconnected - once I got them reconnected and it looked safe I powered it up. It was advertised as having no display, and that was correct, no video at all on the LCD, just a backlight. I connected an external monitor and it gets to the BIOS screen. At the same time I could hear the harddrive clunking like mad - very much dead. I found another 20 gig HD and connected it up. The scope had the original pouch on top and inside was the original floptical recovery media. I removed the floptical drive cleaned it and reinstalled. The disks are from 1999 but so far are still working. Recovery is in progress. Updates as they happen. edit - only had a PS2 keyboard so I made an adapter using an 8 PIN din with pins removed and a PS2 socket. Got to 25% recovery and the floptical drive doesn't sound very healthy but is still going. edit2 - The sucker has an American Megatrends Atlas PCI-III motherboard, a K6-2-/300 CPU and a whopping 64 megs of ram! edit3 - recovery succeeded and self tests pass. The HD was making too much noise though so I dug out a couple IDE 2.5 inch flash drives, one of them seems to work fine so I am recovering to it. Once I determine how much is working I will be pulling the front off to have a look at the LCD. |
| TheSteve:
Well this is encouraging: |
| TheSteve:
Pulled the entire front off the scope. There was a place to push the autoprobe front panel off but the location doesn't match any pictures posted in this thread or the service manual. After getting the front off I determined the ribbon cable wasn't even plugged into the LCD panel. There were also many missing screws. I reconnected the LCD and am very pleased to see it come to life. Now I bought this as a parts unit with no display, no other info was known other then it "appeared complete". Several of the case screws were missing in the picture. It was obviously taken apart for some reason and it looks like someone shoved it back together in hurry being so much was disconnected internally. So far many screws and one of the BNC locking nuts is also missing from the front. I did notice some of the vertical encoders do miss/jump steps - maybe that was the original fault someone was planning to work on and not the LCD panel itself? They are all covered in heavy dust and likely need a good cleaning. I do see a little pulsing/flicker on the LCD panel as it is warming up - maybe it will get worse, or there is a power supply issue. |
| tautech:
--- Quote from: TheSteve on August 06, 2017, 04:15:26 am ---I do see a little pulsing/flicker on the LCD panel as it is warming up - maybe it will get worse, or there is a power supply issue. --- End quote --- On the screen info or the backlight ? |
| Tony_G:
Nice, glad to hear it seems to basically work. As an aside, I've wondered how HP expected you to clip the probe ground to gnd socket for compensation. Seems really easy for it to pop off. |
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