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Introduction:
Because the QuanSheng UV-K5/K6 amateur radio has more and more functions, and the size of the firmware that can be used is also increasing, QuanSheng has also released a large-capacity model with 4Mbit (512K Bytes). The standard K5/K6 versions only have a smaller 64Kbit (8K Bytes).
Furthermore, the larger-capacity models, in addition to having a larger EPROM, have the same components as the standard K5/K6 models, which led to the idea of expanding the standard version into a larger-capacity version.
Working principle:
Currently (as of June 24, 2021), the largest IIC protocol EEPROM available on the market is 2Mbit (256K Bytes). This led to the development of a scheme that uses two EEPROMs in series (see diagram created by Ref in June – see image six).
Furthermore, due to the unsightly appearance of soldering two EEPROMs together with wires, I designed a double EEPROM board based on this principle.
Usage tutorial:
Making boards on a PCB fabrication platform
Thickness: 0.8 mm
Once you receive the PCB, if you notice any excess edges or corners similar to those highlighted in green in the image below, you will need to use sandpaper to smooth them out.
Remove the old EEPROM (since I didn't take a picture when removing it, I used the image from the LOSEHU video).
*Additionally, before disassembling the EEPROM, please back up the configuration data and calibration data according to the "QuanSheng K5K6 Expansion Operation Guide" to avoid unnecessary trouble.
As shown in the diagram, align the eight holes of the small board with the original eeprom pads, and ensure that the PCB silkscreen arrows are aligned with the PCB outline. Adjust the position of the small board and perform soldering.
The smallest panel should be placed at the bottom of the gold-plated frame, to avoid interference from the aluminum cover preventing it from closing.
I use a hot air gun for welding, but if you only have a soldering iron, you can try to heat the two parts together using eight solder holes filled with solder to achieve a strong weld.
Subsequently, weld two M24M02 components.
*For devices with an ST logo, there is only one pin. Please ensure it is not soldered incorrectly, as this could damage the EEPROM or even the radio (refer to LOSEHU's diagram for the EEPROM pinout).
The final welding result is as follows: after successful welding, the EEPROM of 512KB (4MB) can also be detected in the software.
Continue to follow the instructions in the "QuanSheng K5K6 Expansion Operation Guide" for subsequent actions.
Note:
If you have soldered a transfer board but only want to use one EEPROM, please solder your EEPROM at position 1 (marked with "BD4XNS" in silk screen) as shown in the diagram below. Leave position 2 (marked with "2" in silk screen) empty.
Enjoy your gaming!
BD4XNS, 2024-06-21
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