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4 Replacement Procedures 4.31 LCD unit/Touch panel/Digitizer
4-86 [CONFIDENTIAL] PORTÉGÉ M780 Maintenance Manual (960-809)
CAUTION: Read the following instructions before handling the Digitizer.
Do not disassemble or modify the digitizer sensor unit; it may damage sensitive parts
inside the digitizer sensor unit, and dusts or scratches may mar the device.
Be careful of sharp edges of the sensor board; it may cause injury on fingers or skin.
Do not exceed the absolute maximum rating values under the worst probable conditions
caused by the variations in supply voltage, input voltage, parts constants, ambient
temperature, etc.; it may damage the digitizer sensor unit.
Appropriate protection circuit shall be applied to each systems design.
Turn off the power before connecting or disconnecting the digitizer sensor unit.
Scratching with sharp object may cause open circuit of the sensor board.
Do not use any water or chemicals except alcohols to clean the product.
The digitizer sensor unit shall be installed to the system tight by using the single-coated or
double-coated adhesive tape.
Be sure to design the enclosure for the digitizer sensor unit so that
pushing/bending/twisting forces are not applied to the digitizer sensor unit during and
after the installation into the system.
Power supply lines shall be designed as follows. Power supplies shall always be turned on
before the input signals are supplied to the digitizer sensor unit, and the input signals
shall be disconnected before power supplies are turned off. If the sequence does not
satisfy the specified conditions, it may cause the digitizer sensor unit to mis-operate.
Give some slack to the interface cable so that the connector will not permanently pulled
after assembly.
Do not let any bare conductive metal such as LCD metal bezel contact digitizer sensor
unit PCB directly. This may cause the digitizer sensor unit to malfunction.
Do not locate any object that emits magnetic flux such as a speaker magnet near the
digitizer sensor unit, it may cause the digitizer sensor unit not to operate properly.