Electronics > Repair
Tektronix DPO4104 self test errors. Repair attempt diary
cgz2001:
DEMUX0: NA DEMUX1: NA DEMUX2: 0 DEMUX3: 51
TRIGGER:0 DISPLAY: NA mia: 0
AMP0: 0 AMP1: 0 AMP2: 0 AMP3: 0
ADC0: NA ADC1: 72 AMBIENT: 48
Top Fan: 1 Hz Bottom Fan: 1 Hz PS Fan: 1 Hz
I'll look at your other request and get back to you.
cgz2001:
analogRF, please advise what exact commands did you use to get the log file out of the instrument? I would like to get this information out of my instrument but after a few hours or so studying this I am moving on to your other request.
cgz2001:
8 usec / div
1.25 GS/s
100k points
16 Average (Average Mode).
FULL Bandwidth (350 MHz, not limited to 250 MHz or 20 MHz)
I used a Rigol DG1032 signal generator, which maxed out at 30 MHz.
I used the mean function on the scope.
All data was rounded up to nearest uV. Largest reading was 42 uV. This scope passed SPC about a half hour before I ran this test. See attachment.
analogRF:
--- Quote from: cgz2001 on September 05, 2020, 06:42:47 pm ---DEMUX0: NA DEMUX1: NA DEMUX2: 0 DEMUX3: 51
TRIGGER:0 DISPLAY: NA mia: 0
AMP0: 0 AMP1: 0 AMP2: 0 AMP3: 0
ADC0: NA ADC1: 72 AMBIENT: 48
Top Fan: 1 Hz Bottom Fan: 1 Hz PS Fan: 1 Hz
I'll look at your other request and get back to you.
--- End quote ---
your scope does not have half of the ADC/Demux chips compared to mine and they run at lower clock frequency as well
so these numbers although inconclusive, but tell me that my temps are perhaps not source of concern. problem must be something else...
I'm gonna open the scope again tomorrow and this time play with the chips, poking at them, pushing them around and spraying with cold spray to see if something changes. I am beginning to think that this is a solder joint issue in one of those BGA chips :scared: :scared: :palm: :palm:
analogRF:
--- Quote from: cgz2001 on September 05, 2020, 08:49:20 pm ---8 usec / div
1.25 GS/s
100k points
16 Average (Average Mode).
FULL Bandwidth (350 MHz, not limited to 250 MHz or 20 MHz)
I used a Rigol DG1032 signal generator, which maxed out at 30 MHz.
I used the mean function on the scope.
All data was rounded up to nearest uV. Largest reading was 42 uV. This scope passed SPC about a half hour before I ran this test. See attachment.
--- End quote ---
just to make sure, these are GND state readings on scope when you applied a 1Vpp signal to input, right?
well, these are kick ass and almost close to what I get on my DPO7254 on which I get really zero.
However, there is a caveat and that is the front end of my scope is different than DPO4034 (I think quite a bit). So maybe the results are not
comparable but in any scope when you set to GND it should read zero! :o
In any case, since I am reading ""exactly"" the same on all channels and the error clearly refers to U271/U370 and also Ch3 fails in SPC,
I dont think this is the cause of my self test errors. Besides the scope actually works, so if something catastrophic had happened to all channels
causing the relays to blow up, then I should be having lots of issues with the scope I think
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