Safety Precautions - Samsung SGH-E740S Service Manual

1. Safety Precautions

1-1. Repair Precaution
― Repair in Shield Box, during detailed tuning. Take specially care of tuning or test, because the
specification of cellular phone is sensitive for surrounding interference(RF noise).
― Be careful to use a kind of magnetic object or tool, because performance of parts is damaged by
the influence of magnetic force.
― Surely use a standard screwdriver when you disassemble this product, otherwise screw will be
worn away.
― Use a thicken twisted wire when you measure level. A thicken twisted wire has low resistance,
therefore error of measurement is few.
― Repair after separate Test Pack and Set because for short danger (for example an overcurrent
and furious flames of parts etc) when you repair board in condition of connecting Test Pack and
tuning on.
― Take specially care of soldering, because Land of PCB is small and weak in heat.
― Surely tune on/off while using AC power plug, because a repair of battery charger is dangerous
when tuning ON/OFF PBA and Connector after disassembling charger.
― Don't use as you pleases after change other material than replacement registered on SEC System.
Otherwise engineer in charge isn't charged with problem that you don't keep this rules.
― Background color for Navi-keys and 3*4 key pad of silver-coloured mold is 'silver'. Due to its
background color, white LED causes problems in daytime discrimination and brightness uniformity.
By applying Sky-blue LED, advantages both in discrimination and design can be satisfied.
― Be careful to classify
SUB PBA: Print
"BLUE
3*4 KEY FPCB: Stamp
― Colours of SGH-E740(Total of 8): Metal silver, Black dynamic, Light pink, Blue, Hot pink,
― Among above eight, only Metal silver needs Sky-blue LED, while the rest stay with White LED
LED" on the backside
"BLUE LED" on the frontside
Blue green, Yellow green, Emerald green.
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
(see picture attached)
1-1