PT-TW342, PT-TX402, PT-TX312 (serv.man2) - Panasonic Projector Service Manual (repair manual). Page 14

The WARNING indicator will light in red when the lamp runtime (corresponding value) reaches 6,000 hours.
This is to indicate that lamp replacement is required. The lamp runtime is calculated by using the below formula.
The displayed time in [Lamp counter] = "Lamp runtime of [    (Normal)]" × 1.2 +"Lamp runtime of [    (Eco 1)]"
                                                                  + "Lamp runtime of [    (Eco 2)]" × 0.6

 

Normal

 : used time in the normal mode

 

Eco 1

   : used time in the Eco 1 mode

 

Eco 2   

: used time in the Eco 2 mode 

Follow the procedure below to check the lamp runtime:

1

  Press and hold the 

 button on the projector or the remote control for more than 20 seconds. 

2 

 The projector runtime and lamp runtime will be displayed on the screen briefly as follows. 

Counter

Projector 

     110H

Lamp 

   

  

Normal                                       60H

Eco1                                           30H

Eco2 

     20H    

Corresponding value           114H

Total used time

Projector used time

Cumulative lamp 
runtime in each 
mode

● To make sure that the display of the [Lamp counter] is reset to [0 H].

● Please try step 2) again if the lamp counter has not been reset.

J

Be sure to reset the lamp counter after replacing the lamp unit.
1) Connect the power plug, press the power <

> button on the control panel or on the remote control.

2) While pressing the 

 button on the control panel, press and hold the <INPUT/ENTER> button on the control 

     panel for eight seconds or more.

    

● The lamp counter will be reset to 0. (At this time, there is displaying nothing.)

3) Press the <INFO.> button on the remote control .

    ● The [Info.] screen is displayed.