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UART transmission issue

Dear nordic,

I try to build BLE application everything works fine expect the UART. The UART has transmission issue.

it has no problem in receiving. but when i tried to transmitting nothing will see on terminal but receive from uart has perfectly done. ie,when it transmitting some time it print junk or printing some part of data . i am struggling here i need a urgent help from you. this is my custom board

Is any voltage issue?

I tried my application in nrf52832 (development board) board its perfectly works but its not work in my nrf52840 custom board any one know why this happens i need urgent help. 

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