Changing the processor fo duet wifi v1.03!
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Is it possible that due to firmware erase clock may not work? I came to the conclusion that processor is dead, as the pc was not detecting the board, also the x1 clock was not working!
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I think the clock should work even if the firmware is erased, because without it the USB port wouldn't work. But I've never checked. If looking for the clock with an oscilloscope, look on XOUT not XIN, and use a x10 probe. Otherwise, connecting the scope probe may stop the clock.
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Changed the processor and the WiFi chip! It still did not generate clock, so not detected in the pc! What to do?
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Do you have clock signal now?
Are all the supply voltages present?
Is the reset line high? -
Yes all supply is there 3v 3.3v, also the 12v works fine! But clock is not generating
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@hedis how to check if the reset line is high?
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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.
