HP 37717C fan location

[Srbel]

At work, we have an HP 37717C that is overheating. It gets so hot after 15 minutes of operation that plastic begins to smell, and the chassis is very hot. Otherwise, it is functional.

They say that cooling fan is gone. But the problem is that there does not appear to be any fan or fan location on the outside of the unit. There are just vent holes.
I have looked at some fotos from the internet, and they all look the same, no fan. So, the only possibility is that the fan is in the inside of the unit, but I can not find any information on it. None of documentation for HP 37717C mentions anything about fan.

So, does anyone knows something about it?

P.S. I can not open it up without permission, so I would need some evidence of the location/existence of the fan. I mean, if it was mine, I would just opened it up, but...

[jitter]

I may have worked with one of these a very long time ago ("OmniBER" definitely rings a bell), but I couldn't tell from experience where the fan is.

My assumption is that there is a fan inside since there are no vent holes on the top. Devices that produce a fair amount of heat but rely solely on convection would need holes on the top and the bottom.
Based on photos my guess is that the fan is at the rear left and the air exits from the left side.

Time to ask for permission. No point in overheating and destroying something this expensive because of just a failed fan.

Edit: typo corrected.

[mikerj]

I just nipped down to the lab to have a look at out OmniBER but it's a newer unit and there's no mistaking the five fans on the rear of it!  It also has the worst user interface of any HP/Agilent kit I have ever used.

I would certainly expect an instrument of this vintage with a CRT to have a cooling fan anyway.

[Srbel]

Yes, we also have couple of newer OmniBER models (with Agilent badge), and they indeed have a fan on the back. But on this model, it is buried somewhere inside, and I don't think that it is easy to open. It i supposed to slide out, or something, but it seems that some plastic caps on optical connectors will get in the way, and I feel that they will brake if I try to take them off.

I will see next week, but we are very busy at the moment.

P.S. The instrument just sits there unused.. Sometimes, colleagues (including me) would take it and use it, only to find out that it is overheating. So, that is why I would like to fix it.