{{tag>review}}{{tag>english}}
===== UI Board Test & Trouble Shooting =====

==== EEPROM IC7 Pin 1 orientation ====
[{{:ovi40test:ic7_einbau.jpg?400|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 [[http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8828-SEEPROM-AT24CM02-Datasheet.pdf|here]]

==== Potential short cut next to battery holder ====
<bootnote> Also ganz wichtig: Wie auf dem Bild zu sehen unbedingt den einen Anschlußpin vor dem Einbau kürzen/abschneiden. </bootnote>
[{{:projekte:ovi40-sdr:batt_halter.jpg?400|Potential Shortcut (photo DF9EH)}}]

==== Attention: STM32 MCU Pin1 Mark ====
The MCU seems to have two (!) pin 1 marks. Watch text orientation on MCU to find "real" pin 1.
[{{:projekte:ovi40-sdr:ui-i40-cpu.jpg?400| Orientation of TXCO & MCU (photo DF9EH)}}]

==== Missing Audio out ====
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.

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

==== In case of problems to flash the MCU ====
  * 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

==== LEDs too bright ====
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)

==== "WM8731 not detected" ====
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. 

==== MCU does not work, DFU connection / DfuSe not working also ====
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.

==== USB Stick does not work ====
Please check +8V supply from Rf-Board, JP1.