Well, Cliff Plavin and I have uncovered the procedure for accessing the service menu in the NEC LT150:
- Press in sequence: help help help enter menu
- A dialog box will pop up prompting for a password. Press in sequence: down up right up, then press enter
- The existing menus will now be enhanced with additional menu items until the projector is turned off[/list=a]
It may take several tries to get the password dialog to pop up. It seems to help to push the five buttons equally spaced in time over about 3-4 seconds.
Here is what changes when the service menu is activated:- The Source Select menu now has an Entry List showing all of the source formats supported by the projector
- Numerical values appear alongside all adjustable sliders, making it easy to share configuration values with other owners
- Under Picture->Advanced Options, a "more..." selection appears, leading to a menu with adjustments for: VD delay, Sync protection, Clamp timing, Y/C delay, YTR adjustment, and CTR adjustment
- Under Projector Options, after Setup, there's a Setup 2 where you can enable or disable the projector ID (described in the serial protocol documentation ). You can also arrange to make the projector switch between two different sources based on whether or not pin 8 of the serial connector (on the LT150 side I assume???) is shorted to ground.
- A new Test Patterns menu appears at the bottom of the main menu
I don't believe any of the new menu items can harm the projector, but the new parameters under "Advanced Options" can indeed mess up your picture or make the projector lose sync. You should make a note of these settings' values before changing them and experiment methodically.
Let's try to keep all discussion of the service menu in this one thread for reference purposes.
[This message has been edited by Mark Fontana (edited 10-08-2001).] - The Source Select menu now has an Entry List showing all of the source formats supported by the projector