PT-VW350, PT-VW350D, PT-VW350T, PT-VX420, PT-VX420D, PT-VX420T, PT-VX421 (serv.man4) - Panasonic Projector Service Manual (repair manual). Page 60

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ADJ-4
SECTION 3 ADJUSTMENTS
1. 2. Polarizer adjustment
1. 2. 1. Preparation
1. Set the projection distance to 1.2 m or above.
2. Set the interlock switch(K8S) (on A-P.C.Board) to the ON state, and paste the adhesive tape.
  * Do not damage the interlock switch.
  * Please take this adjustment in the darkest room to perform preciously.
1. 2. 2. Adjustment
This adjustment should be taken in order of G-panel, R-panel and B-panel.
1. Turn the projector on and set the screen size to be maximum with zoom function.
2. Make a fine focus and project the "All black" pattern on the screen.
3. Loosen a screw-A on the polarizer holder. (Fig.2)
4.  Adjust the slot B to obtain the darkest brightness on the screen by using a slot screwdriver.
5 Tighten the screw-A to fix the polarizer holder.
6. Take adjustment for remaining polarizers.
A
Slot B 
Fig.1
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