bobbyrae

asked May 1, 2014 at 5:06am
Apple Apple LaserWriter LaserWriter

General printer fan question

I have an Apple LaserWriter 16/600, but I think this is just about printer fans in general.

this thing has 3 fans in it and one of them has gotten noisy, worn bearings no doubt, and so I was trying to find replacements. since it is a Nidec and I took it apart and got the model, I can get a fairly good idea of what I can replace it with.

The one problem is that it is a 3-pin fan and they come in two types: locked rotor alarm or tachometer. I am betting that printers normally use the latter type, but it would be great if someone could confirm that.

Also, in case it matters, the fans do go into a slow mode when not printing, then full speed later when printing.
Today I did a test regarding that fan. I was thinking it would tell me something if I prevented the fan from spinning and then the printer would fail to operate. That's what happened, but now I am not so sure this tells us much. If the third wire is a tachometer, then a speed of zero could give the same result as locked rotor.
by bobbyrae on May 2, 2014 at 12:51am Add comment
Here is a trick I use with most noisy fans. Remove the fan and then peel back the label which covers the shaft. Put a couple of drops of synthetic oil over the opening and work it in by turning the blade a few time. Put the label back over and put back in the printer and most times most of the noise will be gone.
by dmzcompute on May 2, 2014 at 4:52am Add comment
Hey dmzcompute... that sounds like a great idea. I had not been aware of any way to lube fans, but had been wondering about that for years. I will give it a try.

Recently I ran across someone on the net who had posted pics of taking his fan apart, but he also commented that it wasn't intended to be taken apart since it ended up broken! :-( - bobbyrae
This method does work. I just lubed one last week and got rid of the error.
by moe on May 11, 2014 at 1:20pm Add comment