| Electronics > Repair |
| Tektronix DPO4104 self test errors. Repair attempt diary |
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| analogRF:
I finally received my DPO4104 that currently throws out Acquisition self test errors at power-on and cannot complete SPC. However, the scope seems to work fine on all channels. It shows correct amplitude both with 50 ohm and 1M input on all channels and seems to trigger properly (only checked Edge trigger). In 50 ohm there is a tiny offset which must be normal because the last SPC was run 2 years ago on this unit. So it seems to be working OK but it fails self test and SPC also fails to complete I have attached a picture of the error log so maybe somebody can help me to figure out what those error codes mean. The first column 1985 is the number of power cycles. There are 4 identical errors that occur during start up (maybe one for each channel??) and there are two identical errors that appear after running self test Anybody has any idea what they could mean? By the way, can somebody tell me where/how I can access the serial debug console on this machine? Maybe I can get a short description of these errors when they occur. |
| analogRF:
by the way my firmware currently is 2.15. is that why I cannot see any way to enter a license key or transfer license from app module to scope permanently? |
| analogRF:
I just tried to telnet to the scope as per instructions by "andyturk" I can telnet at port 1072 but I cannot connect at port 4000 which enables me to enter manufacturing mode anybody knows what port I should be using? If I open internet explorer, I can connect to the scope's web page and from there I can send commands to the scope but when I enter --- Code: ---:PASSW INTEKRITY :MFG:MOD 1 --- End code --- nothing happens, no extra menus appear in Cal menu. I also tried the same by using USB connection to my laptop and using Keysight Command Expert. I can communicate with the scope but the above commands don't do anything is there another mode for DPO4000? or the command is different? |
| analogRF:
in the DPO4000 backdoor commands published by "tv84" in DPO3000 thread, I can see there is a :MFG:MOD command and also a :DEV:MOD command. But :MFG:MOD 1 didn't do anything for me. Any hint? |
| analogRF:
OK, some progress here ;D :box: I updated the firmware from 2.15 to the latest 2.68 (probably a dumb thing when the scope is showing Acq errors) but to my surprise the scope passed self tests and also SPC finished successfully :) ;D I haD no explanation, maybe it's been on for a 1.5 hours and warmed up enough to pass or maybe it was because the last SPC was run 2 years ago and now something was corrupted or something and it couldn't pass but after firmware upgrade it completely wiped out the scope and in fact asked me to run SPC (it showed a huge amount of offset at first start up after upgrade) and it passed and offset is completely gone and several power cycles after that it was still ok. so I turned it off for about 10min (with a fan blowing at the scope) and when turned back on the self test again fails with the same error codes as before. :-BROKE :-BROKE Any idea what I should be looking at? Could it be some Elec caps on the main board are about to die or are bad? I know it can also be a solder joint but since it is a global thing that affect all 4 channels and also because the scope seems to work fine despite the error, my inclination is that it should be a bad cap perhaps, any idea is appreciated. If I had access to serial console, maybe there was a little bit of info about those errors |
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