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Author Topic: AC Ripple in IREM N3 Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-22-2010 03:09 PM                        I have in IREM N3 power supply that is exhibiting symptoms of high AC ripple. My plan is to replace all 6 diodes and the output capacitor (c7 on the diagram). Is this a good starting point? Someone suggested I consider the RA board as a trouble spot as well, is this suggestion correct?  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 03-22-2010 03:23 PM                  Having done a shitload of dual projector 570 & 870 3D installs, I usually used the IREM N3's cuz one can easily adjust for equal left-eye and right-eye screen brightness via the hand wheel. BUTT! They are basically a shitty PS cuz of the HIGH RIPPLE. I always had to use the auxiliary filter choke accessory to control it....you might look into that.  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-22-2010 03:47 PM                        I will check that out Phil but this issue just started and it is a 2 machine changeover set-up and the other machine isn't showing the same slight strobing. I should add it is connected to a Super 80 on a simplex 1040 with a three blade shutter. We are running 4k lamps @ 140 Amperes.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-22-2010 10:16 PM                     If you are really getting ripple (and the lamp will show it on the anode), I would definitely change the Caps (Irem normally stacks several smaller caps). If you have N3 and not N3Xs...then you will likely find 4 caps forming the main filter with another cap used for boost. In the past 7-years, I've had 2 or three shoot their cookies in Irem N3s. I agree that the Aux filter is a good thing to have in the Irems...the N3-150 and above come with it, standard. Steve  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 03-23-2010 07:02 AM                        IREMs are well known for ripple which is normally not harmful in that design. I have never changed out an IREM capacitor, although I have in alomst every other brand. What I do find in IREM is that the 6 diodes must absolutely match or you will get the sympton you describe. (I never changed all six in my life until I found how touchy this is in IREM.) Louis  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 03-23-2010 09:29 AM                       I have had a capacitor failure with this model, with me in the room. Lots of white smoke, and amazingly, a picture was still on the screen when the dust settled.  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-23-2010 11:07 AM                        What I am getting is a very slight pulsing. This was after installing a new lamp, I tried the old lamp and it is still there. It is really not that noticeable but I want to rectify it before it gets worse. I really suspect it is a diode issue I just figured I should cover my bases and switch out the cap as well.  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 03-23-2010 01:37 PM                     quote: I want to rectify it before it gets worse. Now that's funny.  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-23-2010 01:48 PM                         |  IP: Logged

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