PT-TX400, PT-TX310, PT-TW340, PT-TX210, PT-TW250 (serv.man3) - Panasonic Projector Service Manual (repair manual). Page 16

This projector provides security functions such as "Key lock", "PIN code lock" and "Logo PIN code lock". When 
the projector has set these security function on, you are required to enter correct PIN code to use the projector. If 
you do not know the correct PIN code to the projector, the projector can no longer be operated or started. In this 
case, you must reset those functions first according to the resetting procedure described below and then check up 
on the projector.

1. Disconnect the AC power cord from the AC outlet. 
2. Keep pressing the INPUT/ENTER button and 

 button at the same time. 

    Connect the AC power cord into an  AC outlet again.  
3.  Release the 

 button and the INPUT/ENTER button.

    when the ON(G)/STANDBY(R) LED lights up in green.      
-  The PIN code lock and Logo PIN code lock will be reset as the initial PIN code at the factory and the key lock 

function is disabled.

Please refer to the owner's manual for further information of the security functions. 

Key lock

Locks operation of the top control or the remote control. 
If the Key lock is enabled with top control lock, the projector can no 
longer be started.
Initial setting: Key lock function is disabled 

Pin code lock

Prevent the projector from being operated by an unauthorized person. 
Initial code: “111”

Logo PIN code lock

Prevents an unauthorized person for changing the start-up logo on the 
screen.

Initial code: “111”