Samsung SGH-X430 Service Manual page 9

2 . S G H - X 4 3 0 C i r c u i t
3 . Ke ypad conne c tor
This is cons is te d of ke y inte rface pins in the tride nt, KEY_ROW[ 0~ 4] and
KEY_COL[ 0~ 4] . The s e s ignals compos e the matrix . Re s ult of matrix informs
the ke y s tatus to ke y inte rfac e in the tride nt. Some pins are conne cte d to
varis tor for ESD prote ction. And powe r on/off ke y is s e pe rate d from the
matrix .
So powe r on/off s ignal is conne cte d with PSC2106 to e nable PSC2106.
SVC_GREEN, SVC_RED and SVC_BLUE are from OCTL of CSP1093.
The s e s ignals de cide the c olor of LED, s e rvice indic ator.
Nine ke y LED us e the + VBATT s upply voltage . The s e are conne cte d to
BACKLIGHT s ignal in the PSC2106.
This s ignal e nable s LEDs with c urre nt control. FLIP_SNS informs the s tatus
of folde r (ope n or clos e d) to the tride nt. This us e s the hall e ffe ct IC,
A3 21 0ELH.
A magne t unde r main LCD e nable s A3210ELH which is on the main PCB.
4 . EMI Filte ring
This s ys te m us e s the EMI Filte r to re duce nois e from LCD part. Some
c ontrol s ignals are conne cte d to LCD without EMI filte ring.
3) IF conne tor
It is 23 - pin conne ctor, and us e s 18- pin at pre s e nt. The y are de s igne d to us e
SDS, DEBUG, DLC- DETECT, JIG_ON, VEXT, VTEST, VF, + VBATT and GND.
The y c onne cte d to powe r s upply IC, microproce s s or and s ignal proce s s or IC.
4) Audio
AOUTAP, AOUTAN from CSP1093 is conne cte d to the s pe ake r via analog
s witch. AOUTBP and AOUTBN are conne cte d to the e ar- mic s pe ake r via
e ar- jack. MICIN and MICOUT are conne cte d to the main MIC. And AUXIN and
AUXOUT are c onne cte d to the Ear- mic .
YMU762MA3 is a LSI for portable te le phone that is capable of playing high
quality mus ic by utilizing FM s ynthe s ize r and ADPCM de corde r that are
include d in this de vice .
As a s ynthe s is , YMU762MA3 is e quippe d 16 voice s with diffe re nttone s . Since
the de vic e is capable of s imultane ous ly ge ne rating up to s ync hronous with the
play of the FM s ynthe s ize r, various s ample d voice s can be us e d as s ound
e ffe cts .
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