Just to follow up, here are the lamp ballast (B-module) part numbers for the PT-AE projectors:
The 1/2/3000 projectors all use the same ET-LAE1000 lamp, so the ballasts are interchangeable from the lamp's point of view. The last two digits of the ballast part number that changed are probably just a revision code.
Specifically, between the 1000 and 2000 the ballast schematics show the following changes:
___1) a connector got additional pins so that a temp sensor could be added (making the ballasts not interchangeable between projectors)
___2) a switch (interlock?) was removed
___3) one inductor (EMI filter) was added and one changed
___4) a couple capacitor and resistor values changed
___5) all but one of the diodes changed to new part numbers
___6) two transistor part numbers changed
___7) the output transformer part number changed slightly
but otherwise the circuits are the same.
Between 2000 and 3000:
___1) all of one diode part number changed
___2) the same transistors again changed
but otherwise the circuits are the same (because the ballast connects to other elements of the projector to report health, etc., and there’s no info on form factor, I am not making any claim as to their actual interchangeability).
So between the first three ballasts, I see what amounts to little more that the addition of the temp sensor, plus some minor refinements to optimize performance, reduce costs, increase reliability, and/or account for component availability.
Once we get to the 4000, the bigger difference in part number would certainly suggest
that the red-rich lamp indeed requires a significantly different ballast. HOWEVER, upon comparing its ballast schematic with the 3000 I find ZERO differences electrically. So either there is a change in form factor, the schematics are not correct, or the two ballasts are actually interchangeable and Panasonic is just trying to confuse folks with the new part number.
My feeling is the 4000’s red-rich lamp will run
just fine with a 1/2/3000 ballast. But as stated initially, the reflector could be different and not provide the same end-to-end optical performance such as illumination uniformity, etc. There is also a chance that the red-rich lamp could have electrical characteristics (current, voltage) that are different enough to trigger a fault condition in a projector that was programmed for the 1/2/3000 lamp. And I don’t know anything about the form factor of the 4000 lamp module to say whether it would plug directly into a 1/2/3000, or if the lamp would need to be swapped into the correct housing, and whether or not that would be physically possible.
Anyway, I hope somebody finds this interesting besides me, and I’ll report if I happen to experiment with this further. I suppose if anybody has an ET-LAE4000 lamp, working or not, that they would send me for a reasonable price, I’ll at least compare form factors of the complete module and the individual lamp. If the module does fit, or if the lamp can be swapped, I’ll try powering it up. (I'm in Pasadena CA, if you have a lamp and want to tinker)
FYI, here is a free source of Service Manuals: http://servicemanuals.pro/servicemanuals/panasonic/projector.html