ONKYO TX-RZ740 no fan


Novice Member
I recently bought a used ONKYO TX-RZ740 receiver and I want to ask if it is normal for the fan not to working at all even if I play a movie for 2 or 3 hours.
When I put my hand over the receiver after 2 or 3 hours working it is slightly warm.Not hot.I don't know if the fan is working properly and has higher temp enable point or not working at all.I searched on the net and I didn't find any reference about in what temp and above the fan is starting to work.
The speakers I have are the ONKYO-SKS-HT978THX.
Also I want to ask about the installation of extra 4 speakers I used for Atmos.I had a Logitech Z5500 speakers and I used the two front and two surround for height.
they work just fine but is it ok to use them without the fear of damage it? (or the receiver?).The Z5500 is 8 Ohms as I find and the ONKYO-SKS-HT978THX also are same Ohms.

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