Battery Replacement Method For Icp Board (English) - NEC NC900C Installation Manual

5-3. Battery Replacement Method for ICP Board (English)

The coin battery (Panasonic BR2330) mounted on the ICP board provides electrical power for maintaining tamper detection,
time, and date information while the power to the projector is off. If the battery voltage drops, the tamper detection circuit is
activated and the security key is erased. Once the security key has been erased, the projector requires repair at the factory.
WARNING:
• Before replacing the battery, thoroughly read the content of this section, and perform the work by following the procedure
correctly. If you make a mistake while fitting the new battery, there is a risk of explosion and damaging the projector.
• When replacing the battery, use the same model of battery.
• Dispose of the used battery by following the directions of your local government agency.
• Always adhere to the instructions given in this section.
NOTE
• Make sure that the AC power supply is turned off while removing the ICP board from the projector.
• Although data is maintained while the battery is being replaced for approximately 3 hours by the sub-battery
built into the ICP board (when the sub-battery is fully charged), please replace the battery quickly. To ensure
that the sub-battery is fully charged, turn the projector power supply on for 30 minutes or more before replacing
the battery.
• If you remove the side cover, the following error message is displayed on the LCD screen of the main unit
operating panel by the tamper detection circuit of the signal input board.
"Tamper Fail", "Service Door Tamper"
Also, if you remove the closing panel or device from slot, the following error message is displayed on the LCD
screen of the main unit operating panel by the tamper detection circuit. Furthermore, since the marriage is
cleared, re-marriage is necessary.
"Marriage Tamper Fail", "Physical Marriage Tamper", "Marriage Not Active"
Encrypted contents cannot be displayed while an error message is being displayed. Refer to "3-2. Recovering
from Tamper Errors" (page 47) for the recovery procedure.
Appendix
87