CurtPalme.com Home Theater Forum

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Guys!

Those with LC Marquees, Vision Ones and Madrigal MP9s will want to check their tubes on occasion so pressure does not build up in the fluid chamber; you don't need this:

If ceiling mounted, lay down some plastic sheet like five feet square.

The plate across all three tubes can be removed to access the vent holes. It will be necessary to spread the cabinet sides a bit, so remove a screw for the "spreader bar" or remove the bar entirely:

The metal plate holds the sides in, so remove those screws, one each side:

There are two screws in the back into the heatsink, remove those if necessary. It should not be necessary to pull the sides if the unit is ceiling mounted.

The plate is held to the tubes, and has xray shielding attached, so remove four allen head bolts, 3/16" wrench; pins stick out of the plate into the tube castings so some prying and maneuvering is needed:

With the plate removed, you can see the rubber bellows (black between the castings) and two fillholes on each tube. If the bellows is hard to the touch then some glycol should come out as a precaution. Glycol sucks water vapor right through the rubber, no joke!

The fillhole plugs are tiny allen screws and gaskets, 5/64" if I recall right:

Glycol can pressurize and shoot out with considerable force so watch out!!!!!!!!! Have a bucket directly underneath, and goggles are not a bad idea. Remove enough glycol so the rubber is spongey to the touch with the plug reinstalled.

This procedure is for ceiling (upside down) only. Table standing chassis are best vented with the tubes removed or you risk glycol going everywhere. If you want less work than that, remove the top plate and flip the unit upside down, very carefully, so the fill holes extend over the edge of a table. The unit is quite front-heavy so do this with helpers or some method to secure the back end against falling off the table.

Good luck!

**kal** · Posted: Sun Sep 02, 2007 12:44 am Post subject:

Question: When you vent something like this that is ceiling mounted and the fillhole plugs are on the bottom, once you remove the plugs doesn't the glycol just come pouring out until it's all gone? In other words, how do you just let out "some". Aren't you trying to put the plug back into the hole while liquid's pouring out?

Kal

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

**kal** · Posted: Sun Sep 02, 2007 1:29 am Post subject:

Thanks Tim - that's sort of what I figured. Just wanted to confirm.

I don't have a Marquee but will poke my bellows anyway. Smile

Kal

Brian Hampton · Joined: 22 Apr 2006 Posts: 1173

I wish I could do this today.

(But so far there's no LC marquees here Sad

)

(Soon, perhaps Smile

)

WanMan · Joined: 19 Mar 2006 Posts: 10270

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

So now the truth is known....

Those Marquees that have glycol leaks don't have a PROBLEM. That's a SAFETY FEATURE.

Very Happy

CJ

KennyG · Joined: 10 Feb 2007 Posts: 254

Since the glycol absorbs moisture through the rubber, would this be the reason they get fungus growth?
Moisture + warmth = fungus???

Dave Lister · Posted: Tue Sep 04, 2007 6:31 am Post subject:

Isn't what people keep referring to as 'fungus' actually aluminium salts from the glycol corroding the aluminium surrounding the glycol chamber in AC tubes and the LC chamber in LC tubes and depositing the salts in crystal form on the glass or C element?

**kal** · Posted: Tue Sep 18, 2007 7:22 pm Post subject:

Ok! I've added this procedure here: http://www.curtpalme.com/Marquee_LCvent.shtm

Thanks Tim!

Kal