Ron(UK) wrote in message
...
N Cook wrote:
N Cook wrote in message
...
For factory retro-fitted fans.
3 faults in one just fitting a fan and power bleedoff

For random fan stoppage - look for
Instead of 47R 5W W/W placed in line with the fan (dangling R
unsupported
at
one end) , 0.047R soldered-in so 21V across the 12V fan. Surprisingly
thousands of hours of unproblematic use like that.

Even without that , for any long term excessive wear on the bearing of
fan
,
the reaction force pushes the impeller towards the mounting bracket,
eventually touching it. You could see a slight trace of where one fan
vane
had rubbed the bracket and rubbed the plastic of that vane, ie clear of
usual gunge.


Replace with 47R, supported, and new fan with the centre section of the
mounting bracket hacksawed out.



Fourth mistake : the fan just circulates the air internally, no added
baffles to duct air in from outside.
So air heats up, softens fan's plastic vanes , vanes flex a bit, to the
extent of
touching the mount.

What do you expect? it`s a Trashdown!



Ron



Up till today I assumed they were no better or no worse than any other make.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/