Raspberry Pi Zero W prevents printer from booting  

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sascha.s2
(@sascha-s2)
Active Member

I bought a Rapsbery Pi and used the Octoprint image provided by Prusa. The Printer hat the latest Firmware 3.4.1.
I followed the instructions in https://manual.prusa3d.com/Guide/0.+Preparing+necessary+components/585?lang=en . I plugged in the Pi on the board and switched the printrer on.
The Pi bootet up and I saw on my WLAN router that the PI got a IP address via DHCP. The printer bootet normal and I could enable the RPI port.
But I wanted to properly close the enclose and turned of the printer once more.
When I switched the printer on again it did not boot. There are only those 2 bars on the screen.
I removed the Pi and everything worked again. So I thought the Pi might have died and powered it up by USB. The Pi boots and I can log in by SSH and access the Octopi WebUI.
When I put it back in the Printer, the printer wont boot and show only this screen again:

I removed it again and the printer works fine. Also the Pi works fine outside the printer.

Posted : 14/10/2018 11:53 am
tiago.c
(@tiago-c)
Reputable Member

Did you correctly connect the Pi to the board? Double check your connections

Posted : 14/10/2018 7:21 pm
sascha.s2
(@sascha-s2)
Active Member

After checking everything by eye, I could not find anything wrong. Then I decided to resolder every pin on the raspberry Pi. And hey, I did solve the problem.
But just from looking at it even with a magnifying glass I could not spot the bad welding.

Posted : 14/10/2018 11:32 pm
tiago.c
(@tiago-c)
Reputable Member

Nice you manage it. Maybe a bridge or short somewhere

Posted : 14/10/2018 11:35 pm
randolph.l
(@randolph-l)
Honorable Member

A cold solder joint can be hard to detect without experience and even then if I am working with a board of unknown provence I will touch each joint with a hot iron to observe proper wetting out of the joint.

They can also slip through QC and pas a bench check and fail in usage by the end user... one of the earsons high end electronics vendors will perform a "burn in" is to circumvent this sort of infant mortality.

Modern wave soldering has reduced the occurrence of this sort of failure in consumer electronics but it can still crop up and even present as an intermittent fault.

The pinda is a good example of how an item can be built to a price or service life... the vendor accepts that at a certain point it becomes uneconomic to reduce failure in their device to less than one in 10,000... as long as they pass the QC check at the end of production at that hat rate or better they continue to ship (for a proximity sensor like this I must assume they are also checking if it triggers within an acceptable range, in some places that make this sort of thing QC will actually be preforming a sorting function with devices that trip in a very narrow range close to a tight specification ) will be sorted into an AAA group for the fussiest customer and others would be sorted into A, B, and C batches. then the outfit must decide what level of performance he can afford to source for his machine or device.

Posted : 15/10/2018 12:05 am
john.p57
(@john-p57)
New Member

I have the same problem. I connect the Pi Zero and switch on the printer to get the same two bars on the LCD. I have tried re-soldering the GPIO pins on the Pi, but to no effect. I found a post https://manual.prusa3d.com/Answers/View/1053/Printer+doesn’t+work+when+Pi+is+attached where the cure was a replacement EINSY board. Is this the only real cure?

Posted : 16/10/2018 12:16 am
randolph.l
(@randolph-l)
Honorable Member

John, does removing the zero restore function to the Einsy? if so you might be better off just picking up a Raspberry π 3 B+ and plugging it in to the Einsy there are kits for them with a case and a wall wart to power it on Amazon
total cost less than $60 which is less than a new Einsy and you end up with a far better Raspberry π with load more processing and memory overhead at your disposal.
https://smile.amazon.com/gp/product/B07BFH96M3/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
https://smile.amazon.com/gp/product/B07C6DF8WW/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Posted : 16/10/2018 5:08 am
john.p57
(@john-p57)
New Member

Hi Randolph,

Yes, that is an option. I'm just a bit miffed that the Pi Zero solution doesn't work - when it is supposed to be designed to be a seamless option.

Posted : 17/10/2018 2:19 pm
Olef
 olef
(@olef)
Honorable Member

I do not waste my time on the Zero option. It is underpowered. The one I bought before my Mk 3 arrived is still in its box and both my machines now work very well with Pi3b's connected externally via USB. Another new Mk3 feature that was not fully tested and is in fact pretty useless.

Posted : 17/10/2018 2:38 pm
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