Before Working Inside Your Tablet - Dell Latitude 7230 Service Manual

NOTE: Ambient temperature: - Range as under Ratings.
NOTE: Temperature code - T4A
WARNING: Explosion hazard - Do not use these external connections in a hazardous location: POGO ports,
smart card reader, SIM-card slot, mini-RS232 port, USB 3.0 port, DC-in Jack, audio jack, mini-HDMI port,
microSD-card reader, antenna pass-through port, or USB type-C port.
WARNING: Explosion hazard - The tablet is to be only powered from the battery pack while in hazardous
locations. The power adapter is not certified for use in hazardous locations and not to be used in hazardous
locations.
WARNING: Explosion hazard - The battery must only be changed or charged in an area free of ignitable
concentrations.
WARNING: Explosion hazard - Do not remove or replace the microSD-card and/or battery pack while the circuit
is live unless the area is free of ignitible concentrations.
NOTE: To avoid risk of fire or explosion, replace battery manufactured by Simplo Technology Co., Ltd. only. Use of any
another battery can cause risk of fire or explosion.

Before working inside your tablet

About this task
To avoid damaging your tablet, perform the following steps before you begin working inside the tablet:
Steps
1. Ensure that you follow the
2. Ensure that your work surface is flat and clean to prevent the tablet cover from being scratched.
3. Turn off your tablet.
4. If the tablet is connected to a docking device (docked) such as the mobile keyboard or a docking station, undock it.
5. Disconnect your tablet and all attached devices from their electrical outlets.
6. Press and hold the power button while the tablet is unplugged to ground the system board.
NOTE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an
unpainted metal surface simultaneously as touching a connector on the back of the tablet.
7. Remove any media card and optical disc from your tablet, if applicable.
8. Enter the service mode, if you are able to power on your computer.
Service Mode
Service Mode is used to cut-off power, without disconnecting battery cable from system board prior conducting repairs in
the computer.
CAUTION: If you are unable to turn on the computer to put it into Service Mode or the computer does not
support Service Mode then proceed to disconnect the battery cable. To disconnect the battery cable, follow
the steps in Removing the back-cover
NOTE: Ensure that your computer is shut down and the AC adapter is disconnected.
a. Hold <B> key on the keyboard and press the power button for 3 seconds or until the Dell logo appears on the screen.
b. Press any key to continue.
c. If the AC adapter is not disconnected, a message prompting you to remove the AC adapter appears on the screen.
Remove the AC adapter and then press any key to continue the Service Mode procedure. The Service Mode procedure
automatically skips the following step if the Owner Tag of the computer is not set up in advance by the user.
d. When the ready-to-proceed message appears on the screen, press any key to proceed. The computer emits three short
beeps and shuts down immediately.
e. Once the computer shuts down, it has successfully entered Service Mode.
Safety Instruction.
assembly.
Working inside your computer 7