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Need Help SP-540v Print heater not heating

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iaintnoprophet

New Member
Hello all, my Print heater seems to have stopped heating suddenly. The dryer heater still seems to work as expected. The print heater is looking for 42C but only reaches 29-30C. It is cold to the touch compared to the dryer. In the past, I've noticed it seemed cooler in the middle than the outsides...

Has anyone experienced this and can suggest where to start troubleshooting? There are heater control boards for sale all over the pace but does anyone know where to find a new heating element?

Thank you
 
R

Roland Certified Tech

New Member
iaintnoprophet said:
Hello all, my Print heater seems to have stopped heating suddenly. The dryer heater still seems to work as expected. The print heater is looking for 42C but only reaches 29-30C. It is cold to the touch compared to the dryer. In the past, I've noticed it seemed cooler in the middle than the outsides...

Has anyone experienced this and can suggest where to start troubleshooting? There are heater control boards for sale all over the pace but does anyone know where to find a new heating element?

Thank you
Click to expand...
Could be multiple things.
First the Heater Fuse in the chassis, like below the Main Board in the bottom corner.
Could be the Thermostat or Thermistor for the bed heater.
Could be the relay on the heater relay board in the belly of the printer.
You can swap the connectors for the bed heater with the dryer heater and see where the problem goes the determine id you have bad relays.
As alway, tap on the relays with the end of a screwdriver, as the switch inside can get stuck.
 
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damonCA21

Active Member
Hi, if you need them I have the heating elements, control boards, themistors, heater junction board in stock.
As RCT says, try swapping over the connectors first and see if the problem moves from the printer to dryer beds. It is unusual for the elements to burn out but can happen.
If it doesnt change then it is one of the other parts. They are a bit hard to test though, so often just swapping them for known working ones is easier
 
  • Agree
Reactions: 1 user
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iaintnoprophet

New Member
Alright so, tapping on the relays didn't make a difference. I swapped the heater and thermostat connectors from front to back and sure enough the print heater started working and the dryer cooled down. I swapped the thermistor connections and the temperature readings swapped front to back but the print heater stayed hot and the dryer kept cooling. The fuses look good and test for continuity. Made sure the other connections were seated. So i guess that narrows it down to one or both of the boards?
 
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damonCA21

Active Member
Normally if the control board fails neither will come on so most likely suspect is the junction board that has the relays on has failed which is more common
 
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damonCA21

Active Member
I have these in stock but beware some sellers sell the 300v one as being suitable for the 540v as they don't know the difference. They use different boards as the 540v has more heater elements than the 300v
 
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damonCA21

Active Member
OK when you turn the printer on do you hear any click from the relays on the board? The board is definitely working, so if that isnt the problem then it could be the actual heater control board isn't sending the signal to switch the relays
 
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iaintnoprophet

New Member
damonCA21 said:
OK when you turn the printer on do you hear any click from the relays on the board? The board is definitely working, so if that isnt the problem then it could be the actual heater control board isn't sending the signal to switch the relays
Click to expand...
I've tried turning it on and off a few times, even holding a rigid pick against the relays to see if i could hear anything through them. I can't hear either one clicking but there's quite a bit of noise at that end during startup as it is.
 
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damonCA21

Active Member
Yes it's not always possible to hear them come on with the other noise. The next step really would be to replace the heater control board as that is the only other likely thing to fail
 
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iaintnoprophet

New Member
damonCA21 said:
Yes it's not always possible to hear them come on with the other noise. The next step really would be to replace the heater control board as that is the only other likely thing to fail
Click to expand...
Alright, i wanted to double check the harnesses between the two boards but didn't find a break there so yeah, makes sense to me. Sending a pm.
 
C

cornholio

New Member
As far as my memory serves me right, there are no electromechanical relays in the heater control. Just two SSR that will not emit any sound. (Except maybe once, when they die and smoke...)
 
  • Agree
Reactions: 1 user
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damonCA21

Active Member
Ah possibly, I haven't checked them that closely. In any case they aren't getting the signal to switch so we ate trying the control board next
 
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