Unable to use External J-link debugger with nRF52840-DK

[Jagbir]

I'm having trouble using an external j-link probe (J-Link plus compact) with the nRF52840-DK with Segger Embedded Studio. I am powering the DK from USB (Sw9 VDD) ,using the 10 pin P18 connector on the DK to connect to the J-link plus(20 pin).When I try to "Connect J-Link" in SES it pops with an error saying: "Failed to connect to target. No idcode detected. Please check connection and Target Interface Type". Here is my pin out.

P18_DK         J-link plus side

Pin1    ßà   Pin19(VDD)

Pin2    ßà   Pin7 (SWDIO)

Pin4    ßà   Pin9 (SWDCLK)

Pin6    ßà   Pin13(SWO)

Pin10  ßà   Pin15 (RESET)

Pin3,5,9 ßà   (GND)

I have tried cutting SB60 and shorting SB59 but it did not fix my problem. The on board J-link works fine.

Thanks!

[Simonr]

Hi

What do you mean by "I don't have enough space on my board"? Isn't this an nRF52840-DK which already has an on-board debugger? You say that you were able to use another DK as an external debugger, but not the other J-Link. Are you able to confirm that the J-Link Plus is working, as it seems that the setup is correct? 

Can you also upload a high-resolution picture so I can confirm that it is correct?

Best regards,

Simon

[Jagbir]

By space I mean the room on the new PCB which I am spinning with nRF52840. I have just purchased  the J-link plus last week and  the nRF programmer can display the J-link connected with J-link serial number.Hence, I am assuming that J-link plus is not the problem.

[pdpro]

May you attached a high resolution image of your whole setup as Simonr suggested?