Products > Test Equipment
Fnirsi -TC3
Georgdew:
Hello.
Sorry for the late reply..
In Figure 7, as you can see, I intentionally connected POINTS 1 and 1, to demonstrate that the reading does not change.
As for the capacitors I used in the measurement, they were new.
so the capacitors were not charged (only if they were not charged from ETRA. :-)
I opened the device (Fnirsi-TC3) and made measurements, so that I did not come across any bridges (short circuits).
As for the MCU, I couldn't find the datasheet because the so-called Fnirsi company removed the laser tag from the micro controller.
All large companies that manufacture electronic devices and that of top quality do not remove the markings from the components.
To me, Fnirsi products seem to work like (DIY).
This is the only and last toy I bought from them.
indman:
Georgdew, in your recent photos I see very unpleasant traces of Chinese flux near the ZIF connector.
I advise you to first rinse and clean these traces very carefully and thoroughly. This is important for the correct operation of the device. After washing off the traces, you should dry the device and after a while turn it on again and repeat the tests of the parts.
Active flux could also penetrate into the contacts of the ZIF panel itself, so it is very likely that you will have to temporarily remove this connector and wash this area thoroughly as well.
KungFuJosh:
The easiest way to fix that is to order a new one, and return the defective one.
indman:
--- Quote from: KungFuJosh on November 01, 2024, 08:37:14 pm ---The easiest way to fix that is to order a new one, and return the defective one.
--- End quote ---
This is indeed the simplest method, but it is not always possible for several reasons.
In any case, it was necessary to immediately open a dispute with the seller regarding this fault.
hve:
--- Quote from: kru.czekdb on January 04, 2024, 12:24:44 pm ---Hello, I damaged my dso tc3. charged capacitor 😔 I replaced u6., it works but I don't want to calibrate. can anyone help?
--- End quote ---
Interesting this unmarked chip.
Looking at the foto the processor seems like a LQFP100 package...
My bet is one of these ultra low cost WCH mcu's...
Looking at the mcu selection with LQFP100 we have two candidates: CH32V303 or a CH32V307
Looking at the datasheet the pins seem to match up:
https://www.wch-ic.com/downloads/file/325.html see datasheet CH32V307DS0.PDF
Pins 12 13 are connected to the XTAL...
Pin 72 SWDIO is connected to the pin header on the right...
The 307 has an extra a digital video interface and a 1000Mbit ethernet so I would guess its a CH32V303 ;)
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