Hi, ???I also had a horrible noise from the fan in my hp5335A counter. What I did was to place 15 ohm, ? W resistors and 10 of them on a circuit board, in series with the fan, a total of 150 ohm. I placed the board on the inside of the counter on the right gable. This reduced the fan speed and also the noise substantially. I don¡¯t recall the temperature rise in steady state condition but it was uncritical.
G?ran
G?ran Krusell