NEC VT440 Service Manual page 71

METHOD OF ADJUSTMENTS
2. Adjustment of the Polarizing Plate
It is unnecessary to adjust the polarizing plate.
If the polarizing plate is damaged, however, it is necessary to replace the polarizer and the mounting metal fitting
(POL).
<Replacement procedures>
2-1. Tools required
The following tools are required for this replacement:
<Tools to be used>
• Ball driver for polarizing plate fixing screw mounting and dislodgment : Opposite side 1.5mm
(Ball driver DB-15 (1.5mm) Part No. : 9N000001).
2-2. Preliminary arrangements before replacement
1) Remove the top cover Assy.
2) Remove the Main PWB Assy, the LCES or LCEX PWB Assy, and the Key PWB Assy.
3) Remove the Cover (suction air duct) Assy (Part No.: 24FT7461), the Suction air duct (SK) Assy (Part
No.: 24FT7451), and the Optical cover (SK) (Part No.: 24F32021).
Taking out the filter Assy B in advance facilitates the removal of the optical cover (SK).
2-3. Replacement procedures
1) Remove the polarizing plate Sassy.
Then start the work below for the polarizing plate sassy.
2) Take out the mounting metal fitting (POL) from the condenser lens Assy.
3) Mount a new polarizer on the new mounting metal fitting (POL).
If the mounting metal fitting (POL) is attached with double coated adhesive tapes (in 2 positions), the
mounting of the polarizer should be done after the removal of the peel-off paper.
4) For the item assembled as per 3) above, mount this item on the condenser lens Assy.
In this case, the mounting metal fitting (POL) shall be fixed at the right angles with the condenser lens
Assy. The fixing torque for the polarizing plate fixing screw shall be 1.5 to 2.0kgf·cm.
Note) In regard to the polarizing plate R sassy, the polarizing plate G sassy, and the polarizing plate B
sassy, the mounting angles for the respective polarizing plate fixing screws differ from each
other. Make sure not to confuse these angles. (See Fig. 2.)
5) Mount the polarizing plate sassy, each assembled as per 4) above.
5-24