LENS MEMORY RECALL EPSON RESPONSE AND SOLUTION
All, important update here from Epson today regarding the inaccurate lens memory recall that we have been experiencing. Here is a copy paste of their response. Please read in detail...
The gist of it is, you should move your lens shift in One Direction only, and never step back for final adjustments. I have yet to test this.
Sorry for our late reply on this matter, we were checking with our engineers.
Here is the reply from the engineers on this matter;
We have done the test of lens shift position memory in the QC process on multiple units.
The recalled position accuracy of the units tested were each within spec.
SEC engineers confirmed that the shift amount between recalled position and original position is within 5.5 mm or less as actual measurement value.
There is a possibility of bad accuracy caused by the procedure for fitting in the screen when customers memorizes the different positions.
As a precaution, when you fit the display position to the screen, you should avoid moving the lens shift in the opposite direction.
Please refer to the attached file named “Epson PC 4040-6040UB HC 5040UB-5040UBe Lens shift position memory.pdf" for a better explanation, and try to use this method when setting lens memory positions.
If you move the lens shift "step by step" to opposite direction for fine-tuning, the moving amount will not be counted correctly by sensor. As a result, a memorized position will be shifted from target, and the bad accuracy of recalled position occurs.
This is caused by a factor coming from the mechanical structure and the position monitoring method by sensor.
Unfortunately, SEC hasn't been able to find a better solution for accuracy improvement.
Thank you again for your patience in this matter.
We hope this helps!