renato.l
Posts: 11
Joined: Thu Jul 13, 2017 6:04 am
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Re: Prusa i3MK2S (pre assembled) 20hrs old and dead

Thu Sep 07, 2017 10:02 am

I had to move the images above off the server, so have re-attached them here for everyone's reference.

Update: the replacement Thermistor kit is on it's way, so once received will attempt to install it and improve the cable management to stop anything from breaking again.
Attachments
IMG_3660-1024x768.jpg
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IMG_3658-1024x768.jpg
IMG_3658-1024x768.jpg (85.77 KiB) Viewed 185 times
IMG_3657-1024x768.jpg
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stephen.l2
Posts: 53
Joined: Sat Sep 10, 2016 10:35 pm
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Re: Prusa i3MK2S (pre assembled) 20hrs old and dead

Wed Sep 13, 2017 6:40 pm

The temperature of your nozzle and heated bed should be about the same in ambient temperature. So obviously, you have a defected temperature sensor on your heated bed or pinched wire along the line on your thermistor of your bed.

renato.l
Posts: 11
Joined: Thu Jul 13, 2017 6:04 am
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Re: Prusa i3MK2S (pre assembled) 20hrs old and dead

Tue Oct 03, 2017 10:13 am

A quick update:

I received the thermistor from Prusa support and successfully replaced the component.

I did some more testing when I had the existing thermistor out and doing a simple continuity test I could see it dropping out when moving the wire in isolation.

So before installing the new thermistor I followed the advice of some other forum users; and covered the thermistor wire in heat-shrink, to help it from "work hardening" in the plastic sheath.

The install went well and I've completed my first print, 2h45m and everything went OK, so I hope this is the last issue I have.

Thanks to the community for their suggestions and input.

renato.l
Posts: 11
Joined: Thu Jul 13, 2017 6:04 am
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Re: Prusa i3MK2S (pre assembled) 20hrs old and dead

Sat Oct 28, 2017 11:21 am

Unfortunately I have had the power off issues again. In the last couple of days i've tried to do a couple of small prints (1 @ 25-mins, 1 @ 45-mins) and in both instances, the machine has just switched off mid print.

The machine just turns itself off at random times. I have removed the power supply and conducted power tests and when it is working, it provides a clean and constant 12-volts on both channels. However when it fails, there is 0-volts on both channels, with the full 240-volts being delivered into the PSU from the mains power plug.

It does not seem to be an issue with the actual power switch, as I’ve also tested continuity across the poles too. It seems to be an issue within the PSU, and I’m not going to pull that apart myself.

I've sent an email to Prusa support as in previous communications regarding the Thermistor fault, they said they would replace the PSU if it still happened.

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