PT-DZ680U, PT-DZ680E, PT-DW640U, PT-DW640E, PT-DX610U, PT-DX610E (serv.man4) - Panasonic Projector Service Manual (repair manual). Page 17

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INF - 17
    5. 3. 4. Cleaning procedure for air filter unit
1. Power off the projector and disconnect the power plug from the power outlet.
    And wait at least one hour, and then check if the lamp unit has been cooled down.
2.  Loosen the lamp unit cover fixing screw (one screw) until it turns freely, and then remove the Air filter cover.
3. Hold the tabks on the air filter unit and pull out the air filter unit from the projctor.
4. Clean and dry the air filter unit.
1) Soak the air filter unit in cold or warm water and then lightly rinse it.
* Do not use cleaning tools such as brushes.
* When rinsing, fold the frame of the air filter unit without putting strong
  pressure on the filter unit.
2) Rinse the unit two to three times using fresh water each times.
3) Let the unit naturally dry off in a well-ventilated place where there is little
     dust and the unit is protected from direct sunlight.
* After clearing the air filter unit, make sure that it is sufficiently dry
  before reinstalling it to the projector.
* Do not dry using drying devices such as dryers.
(Please read the page 'Maintenance / Replacement' on the instruction book to know about diatils.)
5. After cleaing the air filter unit, install the filter unit and the air filter cover. 
* Perform the disconect step in the reverse order.
* Air filter unit has installed direction . (Check the mark on the Tabs of Air filter unit)
  5. 4. Initialization for menu lock password
Follow the procedure below to initialize the password to the default "AAAA".
1. While menu lock password is shown on the screen, press ‘AUTO SETUP’ button on remote controller or operation
     panel for more than 2 seconds.
2. Press  
  button for more than 2 seconds.
Air filter cover
Air filter cover screw
Air filter unit
Tabs
* Mark for direction of
the air filter unit
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