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NEC Confidential & Proprietary
The majority of chip components are machine mounted using solder paste. Removal of
the solder is not sufficient for chip component removal. Each solder point must be
heated simultaneously and quickly (to prevent component and PCB damage). When the
solder has melted, remove the component with tweezers.
Short Circuits:
Care must be taken to avoid short circuits. Soldering, solder dust, screws, metal
clippings, metal wrist watches etc. can cause short circuits on PCBs which may result in
component damage.
Test Equipment Calibration:
Your test equipment should be calibrated before use. Frequent calibration is essential
to ensure high quality and reliable repairs.
Cleaning:
Before cleaning ensure that the telephone is switched off and disconnected from the
power source. Cleaning should be done using a soft dry cloth. If the equipment is
heavily soiled a soft cloth soaked in a mild synthetic detergent diluted in water may be
used.
Never use benzene or any other chemicals to clean the equipment.
RF Shielding:
It is advisable to carry out detailed measurements and repair (in particular RX) in a
shielded area to minimise RF interference.
AC Adapter and Battery Charger:
The AC adapter and battery chargers are for indoor use only. Ensure that the devices
are not exposed to rain or moisture.
Electrical Safety:
Electrical equipment is hazardous if misused. Any repairs must be carried out with care
and only by authorised personnel.
Ensure all power sources are switched off and power cords removed before undertaking
any repairs.
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Страница 3: ...NEC Confidential Proprietary Next Section Main Menu Section 1 Precautions for Repair Work 1 ...
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Страница 130: ...NEC Confidential Proprietary IC854 MAY YC0068 T001 MM1612FN BLOCK DIAGRAM OUTLINE DIAGRAM PIN INFORMATION ...
Страница 133: ...NEC Confidential Proprietary U111 MAY YY0020 T001 RF3110 BLOCK DIAGRAM OUTLINE DIAGRAM ...
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