Ok... thanks Acko.
Actually this value surprise me too... looking the schematic I can't see from where the XO can take 4.62V
Hi Enrico,
When you get a chance try powering the XO from an external 3.3V supply instead and see. Jumpers need to be changed accordingly
Hi Acko,
If I understand correctly you want to remove the K1 jumper and use the J2 connector instead if the J1. I have to install also the C9 and re-install the Q2 that we remove last night... correct?
Yes, this is right but you need not install C9 for the tests and Q2 can be left out permanently for the CCD575 XO.
Yes, this is right but you need not install C9 for the tests and Q2 can be left out permanently for the CCD575 XO.
Ok, thanks. I will do when I am back at home... around 7pm Korean time
Hi Acko,
I plan to cut the trace of the PCB just near the exit of the XO versus the pins 3 of the U3 and U5 to see if the 4.6Vdc are still there... I will do tonight if you don't have contraindications
Sorry, I missed your post earlier. Please do not cut any tracks at this stage but for your setup U5 is not necessary and can be removed.
Hi acko,
No problem... please don't sorry, you are kindly help me with this troubleshooting
To recap: I will remove U5 and move the psu to J2 with 3.3Vdc removing also K1. Correct?
Yes, go ahead with these
00.00 mA and 00.00 uA
Possible issue with the XO. Please desolder it carefully, attach wires to the pads of the removed XO and try powering it up separately with a 3.3V supply. Then check its output.
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