Thank you for your input.
Let me describe the problem more.
After posting question here, I decided to go ahead and loaded big print for ten or so hours. All that time I was watching rear fan.
Normally, after switching printer on, third fan works constantly and starts to work making some noise and stops when printer switched off. Not like newer machines which needs 40C. I never updated firmware and done no electric/electronic modifications to printer. So there is no reason for different behaviour.
Yesterday I went for the big print anyway (needed it urgently). Back fan did not work. First hour – no visible spin. Second, third and so on. At the end of printing I gave up to watch it and was very surprised to hear noise when print was finished. Fan was working!
Today I loaded small print for few hours and back fan was working normally from first to last second.
Mystery!
What is happening to it? May be you came across with same problem before?
PS. When it was not working I traced all wire connections from mainboard to the fan and did find no fault. Voltmeter reading was 4.88V. I took 3xAA batteries to make 4.5V and connected to the fan – no spin.
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gr5 2,224
It's normal for it to be silent when you turn it on. Try heating up the nozzle and see if the rear fan (third fan on the back of the print head) comes on when the temp gets above 50C.
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