Samsung SGH-E740S Service Manual

SAMSUNG Proprietary-Contents may change without notice1. Safety Precautions1-1This Document can not be used without Samsung's authorization1-1. Repair Precaution― Repair in Shield Box, during detailed tuning. Take specially care of tuning or test, because thespecification 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 bythe influence of magnetic force.― Surely use a standard screwdriver when you disassemble this product, otherwise screw will beworn 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 overcurrentand furious flames of parts etc) when you repair board in condition of connecting Test Pack andtuning 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 dangerouswhen 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 itsbackground 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 classifySUB PBA: Print "BLUE LED" on the backside3*4 KEY FPCB: Stamp "BLUE LED" on the frontside (see picture attached)― Colours of SGH-E740(Total of 8): Metal silver, Black dynamic, Light pink, Blue, Hot pink,Blue green, Yellow green, Emerald green.― Among above eight, only Metal silver needs Sky-blue LED, while the rest stay with White LED