BOE VFD48-1202FN, Руководство по сборке

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4
then the rest sides' pins.
After finish soldering the MCU chip, double check all the pins,
make sure no short. Then solder two capacitors blow the MCU
chip(1uF and 0u1F), the 1uF one is the key component, must be
installed or the MCU won't work.
Step 2: RTC part
In this step, you need to solder the RTC (Real Time Clock) part
components, it contains 3 components, the major one is the RX8025
RTC all in one chip in SOP14 package, it may have the mark RX8025AC
or RX8025T mark on the surface depends on the kit's version. Please
solder the chip in the correct direction, please control the
iron's temperature, and solder it fast, and take care of the
ESD(Electro Static Discharge) control.
Then solder the diodes D1 in sot-23 package with [ 5C6 ] mark and
the 0u1F capacitor.
(*Please note that RX8025AC and RX8025T are not the compatible
chips, if damaged the chip ,please use the same mark chip to
replace).
You can try to plug the 5V USB power, if the RTC chip and the
MCU in working, you can find the 1Hz(or 2Hz) signal in the 1Hz
testing pad(you can use oscillograph if you have).
If you want, you can install the CR1220 Battery Socket too at
this step, recommend to cut the left&right pads of the socket
a little bit short for easy to solder.(Note: The straight metal
pad part in the socket is the [+] pad, do not go invert;