This page is dedicated to describing my "new" PJ, an Ampro Esprit 4200G which is a nice 9 inch, EM focus & Liquid Coupled CRT projector, performancewise it's in the best class of projectors, but it has a few problems that I've solved and described here.
The cure for all the of the fanrelated trouble is to exchange the 80mm fans with low noise 120mm fans and replace the PSU fan (60mm whiner) with a papst 80mm, in general all filters and fingerguards will be removed, if people want to keep their fingers they will have to keep them away from my PJ.
The two 120mm belly fans have been mounted so they suck hot air out of the case and they don't have to fight convection.
The PSU fan has also been reversed, so it exhausts and to further aid cooling the PSU I have moved the 60mm fanguard to a new hole in the fuse-hatch, so the PSU can get air from inside the PJ.
The new fans have been mounted with weather stripping between themselves and the case and they are held in place with rubber bands to remove vibrations in the case.
To further help cooling of the convergence boards (the heatsinks get too hot to touch after a short while) I have also made a vent over the entire area with the heatsinks and covered it with 4 120mm fanguards.
I've uploaded a bunch of pictures here.
This is a quick list of statistics for the Ampro compared to my old Electrohome ECP 3500:
|Feature||ECP||Ampro||What it's good for.|
|Chassis||Digital||Digital||Both machines are menu-driven and very easy to set up once you have tried it a few times, unlike the old analog machines that were very hard.|
|CRT size||5.5"||9"||Larger tubes mean better focus and more light, 5.5 is the smallest ever made, 9 is the largest except for very rare barco 912 machines.|
|Focus||Electro Static||Electro Magnetic||EM focus allows tighter focus than ES and it is ajustable for different parts of the image.|
|Coupling||Air||Liquid||With LC there are no reflections from the lens to the tubeface that means that a bright spot doesn't leak onto the black surroundings.|
|Color filtering||Glycol||c-elements.||Removes unwanted colors from the output of the tubes for more accurate colors, coloring the glycol doesn't work for LC machines, though.|
|Max resolution||1280x1024||2000x2000||The 4200 is being strange about the resultion it is supposed to be able to run at much higher resoltions than it wants to for me, I guess I need to tweak the modes.|
|Weight||49kg||80kg||The Ampro is much lighter than 80kg once the lenses are removed, yay.|
|Optics||USPL Delta-HD6, plastic+acrylic||USPL HD10, aluminium+glass|
|Tubes||Sony 07ms (+ sd187b)||Sony 09MI||The 9 inch sony tubes are expensive as they cannot be rebuiltd and very few machines ever used them, luckily there are compatible MEC tubes that can be used in stead.|
The two belly fans have been changed, the PSU fan has been changed and the PSU fuse hatch door got the 60mm fangrill.
The red, green and blue tube have gotten new glycol, the damaged green c-element has been changed to the fresh one from Graham and the red c-element has been exchanged with the new one from VDC.
The covers have gotten the 4 coats of jet black paint, it looks pretty bling bling with the golden wireguards I don't normally like shiny crap, but I have to admit I like the look.
It has been put together and when it has warmed up it's around 45 deg at the probe which is on a large capacitor near the center of the focus heatsink, which is the hottest part of the PJ.
I've been able to drop the peak temperature from 45°C to 39°C by blocking the two large holes that are on the outside of the red and blue tube, thus forcing more air past the top boards.
I have the Ampro 2000 technical reference manual, but only on dead wood, I'm scanning it as I need it and putting up the pages here along with schematics from other sources (read: if you have any ampro docs, I'll be happy to host them here):
|ampro-service-manual/1-8.png [1.3M]||Description of CPU, Quad decoder, RGB 1 modules.|
|ampro-service-manual/1-9.png [1.3M]||Description of Test/text, CRT Amplifier, Vertical Deflection and Horizontal deflection modules.|
|ampro-service-manual/1-10.png [1.3M]||Description of H.O.T., LVPS, HVPS, Registration & Registration Amp modules.|
|ampro-service-manual/2-26.png [1.4M]||CRT amplifier (aka. neckboard) schematics with TFB51 modifications inked in.|
|ampro-service-manual/2-28.png [1.2M]||Vertical deflection module schematic.|
|ampro-service-manual/2-39.png [1.6M]||SMPS module schematic.|
|ampro-service-manual/2-40.png [488K]||SMPS regulator (80742X1) schematic.|
|ampro-service-manual/emfocus-sch.pdf [68K]||Schematic of the Ampro 4200/2300 EM focus board (posted by tse to The AVS CRT forum in rajdudes valuable thread about his '4200.|
|HVPS-G2-schematic||Schematic of the G2 part of the HVPS.|