Changing the processor fo duet wifi v1.03!
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The reset line is pin 83 of the processor. It's also connected to one end of R106. the other end is connected to +3.3V. So both ends of R106 should be at +3.3V.
Have you checked for solder bridges between the pins of the processor, and for pins not soldered down properly?
I suggest you also check that both ends of L5 and L6 are at +3.3V.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
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Connect the negative lead of your voltage meter to gnd somewhere on the board/power supply and only move the positive lead to the desired test point when you make these measurements.
Just make sure that you have +3.3v on the reset line, then it should be in the correct state.
Does the computer react when you connect the USB now after the CPU swap?
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@hedis no computer does not detect the board!
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@dc42 I have checked thoroughly no R106 on my board! When I checked PDF schematic it showed internal 100k in processor for reset. My board is duet WiFi V1.03
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@dc42 my reset button is not moving properly once I press it doesn't move back! Can it be the reason? The voltage on the reset button is 3.03v
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Voltage at l5=3.3v, l6=1.2v
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@yatinsd said in Changing the processor fo duet wifi v1.03!:
Voltage at l5=3.3v, l6=1.2v
What do you mean by I5 and I6 ?
Which version Duet is it? I can't remember whether R106 has always been present or was added in a recent revision.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42, mine is Duet wifi v1.03, I Mean the L5 & The L6 you asked me to measure if at 3.3v, in your last reply in this post.
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@yatinsd, that's the correct voltage. i wondered whether one of those inductors/ferrite beads might have failed.
The NRST pin is active low, so +3V should be high enough to prevent it from resetting.
Perhaps you should check continuity between the data dna ground pins on the USB socket and the USB and ground pins on the microcontroller.
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@dc42 is L6 at 1.2v correct?
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@yatinsd said in Changing the processor fo duet wifi v1.03!:
@dc42 is L6 at 1.2v correct?
Yes, L6 is between VDDOUT (which is the 1.2V output from the on-chip regulator) and VDDPLL.
Are you sure that the connections between the USB pins of the MCU and the data pins of the USB socket are OK?
I'll try erasing firmware on one of my boards and check the clock.
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@dc42 i have checked the voltage on v bus the voltage is 1.02v. DDP & DDM are continuous with pin 137-36 respectively. usb ground is continuous with controllers ground.
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@dc42 did you see the clock after erasing the firmware?
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I see the clock whether or not the firmware has been erased. It's about 200mV peak to peak on C45.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 what should i check then? should ichange the clock? i have seen 0.2 mv across c45!!
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I suggest you check the soldering of the clock pins of the MCU, to make sure they are soldered to the pad and not shorting against each other or to adjacent pads.
You did fit the new MCU the right way round, didn't you?
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@dc42 the processor is in right orientation. I have got this thing soldered by a professional, and I myself have verified that its touching the right places! can the clock go bad in this??
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@dc42 I have tried everything! But not been able to resolve! Can I send it over to you? Or any other thing?
