To suck or to blow, that's the question !

[Level42]

Well....I finaly connected my new 12 V fan on top of the LOPT of my Double Axle monitor (think it's a Hantarex MTC-9000). However, I was wondering the following:

The fan that was originaly fitted was blowing air from the top towards the LOPT (and the very large resistor near it). Wouldn't it be better to do it the other way and let it suck up the hot air coming from the LOPT and the resistor ? This would also "add" to the natural "chimney effect" airflow inside the cab, instead of working "against" it.

All CPU fans I know work that way, PSU fans work that way, you name it.

What do the expirienced Arcade monitor experts think ?
I have the MTC-9000 pdf file, but that one doesn't show a fan at all...

Also, gonna run this thing on 7V, cause it's way to loud for me at 12V....

[censei]

If you made the fan do suction, then the components that are producing heat are still producing the same amount of heat and there would be almost no temperature change to the components. Also CPU fans use a system of cocurrent/countercurrent exchange for air to maintain temperature.

[Ken Layton]

This monitor generates lots of heat in the flyback and large resistor area. The fan absolutely positively must blow air on these components. The capacitors there must be forced air cooled also by that fan. Don't even think of lowering the voltage to the fan!

If your fan is too noisy then it's shot and should be replaced with a new 12 volt DC one.

[Level42]

Oops..you guys got me convinced 

Thanks ! I actualy ran this game without the fan connected for a while. Never for more than half an hour but still 

Actualy, this fan is brand new, since the old one was the cause of my Hantarex US250 power supply blowing up. It was connected to the 5V fan output of this PSU but it WAS a 12V !!!!! This output is normaly used on the US250 for a 5V fan that is on top of the PSU itself. (My bet is that the 250 and 300 are exactly the same with only the extra cooling making it able to deliver more amps).

What I know from PC's is that 12V fans will run at 7V but NOT at 5V. There's been more bad workmanship on this cab however (mains protection switch was removed and connected through) so it wouldn't surprise me this was all non-standard.

So either the old fan was defective or jammed, or either it got to low power to run. I didn't care and got a new one anyway. It is quite noisy though, even with cab back closed. But this is probably also because it is now in my living room. I will keep it on 12V as Ken suggests, because after adjusting (focus !) and cleaning the monitor and glass, the picture looks like brand new, so I hope to keep this baby alive and well running for a very long time.

Thanks for your replies !