19STACK menu settings3M™ Digital Projector X56© 3M 2011. All Rights Reserved.3. Press the ◄ button to return to the previous menu, or press the ► button tocomplete the setting. (23)NOTE • If DUAL is selected, a menu to select MAIN or SUB appears onscreen when a button on the control panel of the projector or remote control ispressed. Select the projector that you want to operate. Refer to the examplesbelow.- When the MENU button is pressed, a menu to select MAIN or SUB isdisplayed. If MAIN is selected, EASY MENU or ADVANCED MENU of theMain projector is displayed.- When the KEYSTONE button is pressed, a menu to select MAIN or SUB isdisplayed. If MAIN is selected, KEYSTONE menu of the Main projector isdisplayed.• When DUAL is selected for LAMP MODE, there are operating restrictions asfollows.- AUTO POWER OFF andFREEZE functions on bothprojectors are disabled.- The test patterns for CUSTOM ofGAMMA and COLOR TEMP arenot displayed.- It takes slightly longer time toturn on the projectors. This is nota malfunction.Menu to selectMAIN or SUBMenu on Main projectorMenu to selectMAIN or SUB Menu on Main projector(continued on next page)3.3 Selecting lamp operation modeSelect the DUAL or ALTERNATE lamp operation mode.1. Highlight LAMP MODE in the STACK menu withthe ▲/▼ buttons, then press the ► button todisplay the LAMP MODE dialog.2. Use the ▲/▼ buttons in the dialog to highlight DUAL or ALTERNATE.DUAL: Turns on the projectors at the same time.ALTERNATE: Turns on the projectors alternately.