PT-VW350, PT-VW350D, PT-VW350T, PT-VX420, PT-VX420D, PT-VX420T, PT-VX421 (serv.man4) - Panasonic Projector Service Manual (repair manual). Page 79

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ADJ-23
SECTION 3 ADJUSTMENTS
4. Writing software  window will appear.
  Once disconnect the AC cord, press and hold the [v/b] and [ENTER] buttons at the same time and then connect the  
 
  AC cord. The LEDs will start blinking to show that the projector is in the writing mode.
5. Click [Choose...] button and choose the setting file [FlashAll.inf] in the extracted folder and click [Open].
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