Temperature too low?

[Vinyldog]

I switched the ribbon cables on the blu/blk head of my SP540V to try and diagnose why black is not printing and when I fired it back up got the error: "temperature too low". It's 71deg. with 38% humidity in here right now so I don't think that should be a problem.
I swapped the cables back at the control board end, meaning now the connections are back as before but with a different cable connecting them. The result was a nozzle check with no cyan or black.
Previously there had been CMY but no K in the nozzle check.

 

[Ragnabrok]

every head has a thermostat on it, but it only uses the measurement from the black head. If the connection is incomplete from a bad cable, or broken head or board, it wont get a value for temperature, and probably give you that error.

 

[Vinyldog]

Interesting. Might be time to replace that cable. Ready to do some more test today.

 

[Vinyldog]

After pulling fluid from the cleaning cartridges through the lines today it is obvious that the C ink was much easier to pull through than the B. So I think there is a feed problem between the dampers and cartridge.


Concerning the ribbon cables that travel from the board to the heads, I noticed that on some the Sumitomo logo was facing a different direction than the other. Are these directional cables that have to be installed in a certain orientation?

 

[Ragnabrok]

Yes, they are directional. the contacts have a blue plastic cover on one side. all 4 of them should be facing the same direction.