EEPROM IC7 position (photo DF9EH)

This is where the dot is printed. Also the edge of the case is slanted near the 1-4 pins. See here

The MCU seems to have two (!) pin 1 marks. Watch text orientation on MCU to find „real“ pin 1.

Orientation of TXCO & MCU (photo DF9EH)

In case of missing audio out: just in case, please check the SW_12V connection. This is power supply connector for Audio power amplifier stage unlike the mcHF.

Typischer Stromverbrauch: mit Display 280mA und ohne Display sind es 190mA. Die 80mA waren ohne Display direkt nach der Inbetriebnahme.

• RTC clock crystal and TXCO are prerequisite for flash programming to work
• Check correct orientation of TXCO (see photo on this page)
• Check 3.3V at C95. If not present then L3 may be defective

With the kit resistors the LEDs are quite bright. DF9EH has reduced the values as follows:

• R36 22k6 (D1 green)
• R37 6k8 (D2 red)
• R116 6k8 (D3 blue)

In case you see this UHSDR error message please check +3V supply for codecs (WM8731) is ok. This +3V supply is generated on RF board.

First check that MCU is soldered in in correct orientation (see above „Pin 1“).

In order to boot the MCU needs:

• CPU clock (→ check TXCO clock)
• correct reset voltage over time at boot up (→ check voltage over time, check voltage levels at reset pin of MCU)

Only if thos pre-conditions are met will the MCU work with DfuSe or ST-Link/V2 and closed jumper „P6“.

Only after bootloader starts correctly will pin voltages for switches, LEDs and LCD be initialized to some extend., e.g. „Band+“ and „Band-“ switch.

Also check:

• Does PC recognize the OVI40 UI board connected via USB cable, as USB device in device manager?
• PC USB port working? USB cable ok?
• Check all MCU pins are correctly soldered and no shortcuts exist: Use a thin knife / scalpell / tweezer, go inbetween MCU pins and try to push the pins gently sideways one by one, check if all are soldered to PCB. If not the pin moves slightly.

Please check +8V supply from Rf-Board, JP1.