Hi,
Sorry for this old story but there's some news about my TDS520.
Due to real life it waited since december 2023 for my attention. Last week only took it from its shelf, opened it and I removed the nearly 50 chemical caps on the acq board (A10).
Then A10 went in a friend's dishwasher. I then recapped with Nichicon and put it back. Remember it booted in 2023 and only failed on Acquisition & Attn/Acq interface. Now no boot.
I measured on the new caps and found one supposed +5V to be -0.6V. To make it short there's a through hole just near C1584 and of course it juiced there and now no more continuity. I soldered a small piece of wire and got back that 5V.
But still no boot and no 1kHz on the probe comp signal.
I followed the troubleshooting procedure which told me to "Change A12". Well, thanks but no. That procedure had me disconnect some connectors though and once reconnected the scope booted.
-Fail processor (pass in 2023)
-Pass acquisition (fail in 2023)
-Fail Attn/acq (as in 2023)
There I got myself a little snack away from the darn thing. Came back two hours later and rebooted
Now Fail processor and all the rest pass.
And : "Consult service manual for fault isolation. Press CLEAR MENU to continue" which I did but not with much hope.
I was wrong. I put a probe on CH1 and got the probe comp signal on screen.
I did not proceed recapping A11 (processor) because it booted and I wanted to test A10 first. Now I will.
Also I should "Consult service manual for fault isolation" ! There's still that Fail processor.
Here I am and, as usual, all criticism, comments or advices welcome.
Best
Renaud
