rapido uhf(old) Heater not heating properly

So i just finished a Print and I tried to print something New and I got this error. What I saw is that the temperature went backwards from 50 to 49 for example. us there anything I can do
No description
20 Replies
other-emerald
other-emeraldā€¢15mo ago
Not even asking what those other tabs are kekw did you restart the whole printer and tried again? checked the connection of the hotend cables is good? if yes - disconnect the connector and measure the resistance!
Achi447
Achi447ā€¢15mo ago
its an artist lol, but yeah i did restart and checked connections. guess ill measure when im home again thanks alot @seriosha so if I measured correctly i got 0.3ohm on both cables
other-emerald
other-emeraldā€¢15mo ago
You need to measure from one lead to the other, or even better, from one of the contact patches on the heater to the other patch the cables have to be disconnected in any case
Achi447
Achi447ā€¢15mo ago
@seriosha ok will do that did that and same thing I got 0 to 0.3ohm
other-emerald
other-emeraldā€¢15mo ago
That's bad unfortunately. If you do the Math - the Heating Element is rated at ?105Watts? at 24V that means you should measure UĀ²/P = R Ohms, so about 5,5 Ohms. 0 to 0.3 Ohms basically means that your heater shorted out
Achi447
Achi447ā€¢15mo ago
yeah i just did the mathe XD well no sure why or how. but i already ordered a new heating element thanks for your help
other-emerald
other-emeraldā€¢15mo ago
you're welcome! And measure the new one before you put it in - and post what you measure šŸ˜‰
Achi447
Achi447ā€¢15mo ago
will do that thanks
other-emerald
other-emeraldā€¢15mo ago
welcome šŸ™‚ and good luck!
Achi447
Achi447ā€¢15mo ago
i got the new heater block and only from heaterblock connection to heaterblock i got 6ohm on both but it still doesnt work. i guess the cable is fucked too somehow
other-emerald
other-emeraldā€¢15mo ago
What do you get only from pad to pad on the heater itself? And checking everything down the line to the board after having a short is a good thing anyway šŸ‘
Achi447
Achi447ā€¢15mo ago
from pad to pad pn the ceramic block 6.1
other-emerald
other-emeraldā€¢15mo ago
That sounds about right at least šŸ™‚
Achi447
Achi447ā€¢15mo ago
with a different cable it still doesnt work changed the slots for the thermistor and heater slot. do i have to change the thermistor ? it says 104NT-4 but i dont know from what company i fixed it
other-emerald
other-emeraldā€¢15mo ago
what was the problem?
Achi447
Achi447ā€¢15mo ago
@seriosha i have no clue. i restarted it for the 10th time(probably changed something that i cant remember)and then it worked, but now my prints have theese weird layer lines.
No description
other-emerald
other-emeraldā€¢15mo ago
that's a new help thread i guess šŸ˜… But if you printed well before. you should of course look into what changed. easier said than done ofc, but this looks mechanical
Achi447
Achi447ā€¢15mo ago
yeah I'm going to try to fix it on my own first
other-emerald
other-emeraldā€¢15mo ago
good luck man šŸ™‚
Achi447
Achi447ā€¢15mo ago
thanks i need it XD
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