Samsung SGH-S300 Service Manual
G
S M TELEPH O N E
S
GH-S300
Manual
SERVICE
G
SM TELEPHO NE C O N TEN TS
. Specification
1
2. Exploded View s and Parts List
3. Ele c tric a l P a rts List
4. B lock Diagram s
5. PC B Diagram s
6. Flow Chart of Troubleshooting and
CircuitDiagram s
1
. SGH-S300 Specification
1. G S M G en eral S pecifica tion
SM 900
G
Phase 1
Freq. B and[M H z]
Uplink/Downlink
A R FC N range 1~124
T x/R x spacing 45M H z 45M H z 95M H z 80M H z
M od. B it rate/
B it P e rio d
Tim e Slot
Period/Fram e Period
M odulation 0.3G M SK 0.3G M SK 0.3G M SK 0.3G M SK
MS Power 33dB m ~13dB m 33dB m ~5dB m 30dB m ~0dB m 30dB m ~0dB m
890~915
935~960
270.833kbps
3.692us
576.9us
4.615m s
EG SM 900
Phase 2
880~915
925~960
0~124 &
975~1023
270.833kbps
3.692us
576.9us
4.615m s
D C S1800
P hase 1
1710~1785
1805~1880
512~885 512~810
270.833kbps
3.692us
576.9us
4.615m s
PC S1900
1850~1910
1930~1990
270.833kbps
4.615m s
3.692us
576.9us
Pow er C lass 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
S e n sitiv ity -102dB m -102dB m -100dB m -100dB m
TD M A M ux 8 8 8 8
C ell R adius 35K m 35K m 2K m -
SAMSUNG Proprietary-Contents may change without notice
-1
1
SGH-S300 Specification
2. G S M T X p ow er class
XPower
T
control level
5 33
6 31
7 29
8 27
9 25
10 23
11 21
GSM 900
¡
dB m
2
¡
dB m
2
¡
dB m
2
¡
dB m
2
¡
dB m
2
¡
dB m
2
¡
dB m
2
TX Power
control level
0 30
1 28
2 26
3 24
4 22
5 20
6 18
D C S1800
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
TX Power
con trol level
0 30
1 28
2 26
3 24
4 22
5 20
6 18
PC S1900
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
12 19
13 17
14 15
15 13
16 11
17 9
18 7
19 5
¡
dB m
2
¡
dB m
2
¡
dB m
2
¡
dB m
2
¡
dB m
3
¡
dB m
3
¡
dB m
3
¡
dB m
3
7 16
8 14
9 12
10 10
11 8
12 6
13 4
14 2
¡
dB m
3
¡
dB m
3
¡
dB m
4
¡
dB m
4
¡
dB m
4
¡
dB m
4
¡
dB m
4
¡
dB m
5
7 16
8 14
9 12
10 10
11 8
12 6
13 4
14 2
¡
dB m
3
¡
dB m
3
¡
dB m
4
¡
dB m
4
¡
dB m
4
¡
dB m
4
¡
dB m
4
¡
dB m
5
15 0
¡
dB m
5
15 0
¡
SAMSUNG Proprietary-Contents may change without notice
1
-2
dB m
5
6
. SGH-S300 Flow Chart of Troubleshooting and CircuitDiagram s
.Baseband
1
1. P ow er O N
'
Pow er O n' does not
C
consum tion m ore than
work
heck the current
100m A
YES
O
N
Dow nloader again
Check the
Vbat(battery+O)
Voltag e m o re th an
15 of U 100 ismore
Check the clock signal
3.3V
YES
C heck the pin
than 2.8V
YES
U100 pin 46,39
=2.8V
YES
U 100 pin13
=1.8V
ES
Y
at
pin4 of U 801
Freq=13M H z ?
Vrms¡˘¡300m V ?
Vpp is around
900m V pp
O
N
O
N
O
N
O
N
O
N
Check the clock generation circu it
C
harge the Battery
C
heck U 100 and C113
C
heck U 114 and C116
C
heck U 112
(re late d to O SC 801 and U 801)
ES
Y
'
Pow er O n' does not
work
E
ND
SAMSUNG Proprietary-Contents may change without notice
-1
6
SGH-S300 Flow Chart of Troubleshooting and CircuitDiagram s
.Initial
2
I
n itial F ailure
C
he ck the sign al a t the
pin28ofU100is
"H igh" w hen the phone
isbooton
YES
Check the pin 22 of
U 100 is"High"
YES
C heck the pin4 of
OSC801 isaround2.8V
O
N
O
N
O
N
C heck U 100
C
heck the U 700
C
heck th e s o ld e re d s ta tu s o f
O SC801, R803, U 100
3. Sim Part
YES
C h ec k a nd re so lder LC D connector C N 200
ifthere is s older bridh e be tw e en the p ins
ES
Y
EN D
P
hone can't a cce ss S IM ca rd
C
heck the pin 1 of CN 100.
Voltage=3V?
YES
C
heck the SIM
co nn ec tor's (CN100)
connector's to S IM card
YES
O
N
O
N
C he ck the circ uit relate d to
r
U 100
esolder or change C N 100
C he ck the circu it aro un d C N 1 0 0 inp ut
circ u itry
YES
C he ck the circ uit a ro un d U 60 1 o utp ut
and voltag e sup ply c ircu itry
ES
Y
EN D
SAMSUNG Proprietary-Contents may change without notice
O
N
O
N
6
-2
C
he ck the related circuitof
C N 100
C he ck the related circuitof
U 601 and U 100
. C harging Part
4
A
bn orm al c ha rg ing part
C
heck the pin 17,18 of
CN302 VEXT is > 4V?
YES
C heck the pin 2 of U 103
is"LOW"?
YES
C heck the pin 3 of Q 101
is"LOW"?
YES
S
GH-S300 Flow Chart of Troubleshooting and C ircuitDiagram s
O
N
O
N
O
N
C
heck U 100
C
heck the U 700
C
heck the Q 101
C heck the pin 5 of U 102
is"3.2~ 4.2"?
ES
Y
Check if ICHRG is1V
(du ring ch arging ) an d
arou nd 1 80 m V (full
ch arging )
ES
Y
EN D
O
N
O
N
C
heck the U 102
R
esolder or change R 111
SAMSUNG Proprietary-Contents may change without notice
6- 3
SGH-S300 Flow Chart of Troubleshooting and CircuitDiagram s
.M icrophone Part
5
M
icrophone does not w ork
O
C
he ck the asse m bled
sta tu s o f m icrop ho n e.
YES
C
heck the reference
voltage on m ic path
C418 =2.5V
YES
Ismicrophone ok?
N
O
N
O
N
R e ass em blag e m icrophone
r
esolder or change
C400,R 428,R 409,R 405,R 406)
C
heck U 700
6. Speaker P art
S
peaker does not w ork
C heck the connection
statu s sp k to C N 20 0
Check U700,R201,R202
ES
Y
EN D
YES
Check the PIN 1 of
U402='High'?
YES
O
N
O
N
O
N
R e solde r and ch e ck th e bo ard
to board connector
C
heck U 601
C
ha ng e or re so lder
U 700, R201, R202
YES
Is s pe ak er o k?
ES
Y
EN D
N
C
O
SAMSUNG Proprietary-Contents may change without notice
6
-4
hange Speaker
.Back Light
7
C
B
ack light does not w ork
h eck th e so ld ere d sta tus of EL pad
YES
B
ack lig h t "O N " m o d e in
the m eue?
YES
Check the PIN 3 of
200-1 = 2.8V ?
YES
S
GH-S300 Flow Chart of Troubleshooting and C ircuitDiagram s
O
N
O
N
Select backlight "O N " m ode
C
heck the U 601
C heck the connection
fro m C N 2 0 2 to L C D
Module
ES
Y
LCD backlight on?
ES
Y
E
ND
O
N
O
N
R
ep lace FPCB CONNECTOR
C
ha ng e L C D M o du le
SAMSUNG Proprietary-Contents may change without notice
6- 5
SGH-S300 Flow Chart of Troubleshooting and CircuitDiagram s
.Alert T on e
8
A
bn orm al A lert tone
A lert ton e O n by p ush ing the key
*# 02 8 9#
C
heck the P IN 17, 18 of
CN200-1
Is there alert w ave?
YES
C
heck th e co nn ec tion
from CN 200-1 to LCD
Module
YES
A lert isok?
ES
Y
END
O
N
O
N
O
N
C he ck the circ uit relate d to
U 400,U 401
C
hange Speaker
C
ha ng e L C D M o du le
SAMSUNG Proprietary-Contents may change without notice
6
-6
.RF
2
1. G S M R eceiver
C
ONTINUOS RX ON
RF IN PU T : 62CH
Cell pow er : -50dB m
NORM AL CONDITION
ca tch the channel?
YES
F1002 CHECK
pin13 ¡ˆ -65dB m ?
YES
F1002 CHECK
pin1,2 ¡ˆ-65dB m ?
YES
U901 CHECK
pin21,22 ¡ˆ-65dB m ?
O
N
C1012,L 1015,C 1002 contact?
O
N
O
N
O
N
re s o lder or change
res olde r o r cha ng e
C
1007,L 1001,C 1011
re s o lder or change
S
GH-S300 Flow Chart of Troubleshooting and C ircuitDiagram s
CHECK
C
N1001
F
1002
YES
U
901
pin 1 2,13 ¡ˆ
20dBm ?
O
N
YES YES
U901 CHECK
pin14,23,26,32 :
3V ?
NO
YES
U 901 Pin3,4
V p-p:240m V ?
NO
YES
U 901 Pin1,2
V p-p:250m V ?
NO
YES
U 900
Pin 2 ,3 ,4 ,5
V p-p:100m V ?
YES
NO
U 902 CH EC K
pin5,25,28 : 3V ?
U 902 CH EC K
pin7:13MHz?
YES YES
U902
change or resolde r
U100,PIN 46,C114
res olde r o r cha ng e
U900 CHECK
pin 6 ,20 : 2.8V ?
YES
U900
res olde r o r cha ng e
NO
NO NO
U100,PIN 39,C116
ch ec k o r res olde r
OSC801 CHECK
pin3:13MHz?
V p-p : 950m V ?
C808, R805
re solde r
NO
NO
OSC801 CHECK
pin4:clean
3V ?
YES
OSC801
ch an ge
L1006,C 1015,C 1019
re s o lder or change
SAMSUNG Proprietary-Contents may change without notice
6- 7
SGH-S300 Flow Chart of Troubleshooting and CircuitDiagram s
.DCS Receiver
2
C
ONTINUOS RX ON
RF INPUT :698CH
Cell pow er : -50dB m
O
NORM AL CONDITION
c atch the ch an ne l?
YES
F1002 C H EC K
pin13 ¡ˆ-65dB m ?
YES
F1002 C H EC K
pin6 ¡ˆ -65dB m ?
YES
U901 CHECK
pin17,18 ¡ˆ-65dB m ?
N
C 1012,L1015,C1002 contact?
O
N
O
N
O
N
reso lder or change
re s o lder or change
C
1014,C 1017,L1002
re s o lder or change
CHECK
C
N 1001
F
1002
YES
U
90 1
pin 12,13 ¡ˆ
20dB m ?
O NO
N
YES YES
U901 CHECK
pin14,23,26,32 :
3V ?
NO
YES
U 9 01 P in3 ,4
V p-p:240m V ?
NO
YES
U 9 01 P in1 ,2
V p-p:250m V ?
NO
YES
U 900 Pin2,3,4,5
V p-p:100m V ?
YES
U902 CHECK
pin5 ,25 ,28 :3V?
U 902 CH EC K
pin7:13MHz?
YES YES
U 902
ch ang e or re so lder
U 100, PIN 46, C114
re s o lder or change
U 900 CH EC K
pin 6 ,20 : 2.8V ?
YES
U 900
re s o lder or change
U 100, PIN 39, C116
check or resolder
NO NO
O SC801 CH E CK
pin 3 : 13 M H z ?
V p-p : 950m V ?
C 808, R805
res olde r
NO
NO
OSC801 CHECK
pin 4 : clean 3 V ?
YES
O SC801
ch an ge
NO
L1006,C 1015,C 1019
reso lder or change
SAMSUNG Proprietary-Contents may change without notice
6
-8
. P C S R eceiver
3
C
ONTINUOS RX ON
RF INPUT :698CH
Cell pow er : -50dB m
N ORM AL CONDITION
catc h th e c ha nn el?
F1002 C H EC K
pin13 ¡ˆ -65dBm ?
F1002 C H EC K
pin6 ¡ˆ-65dB m ?
F1005 C H EC K
pin4,6 ¡ˆ -65dB m ?
U901 CHECK
pin17,18 ¡ˆ -65dBm ?
YES
YES
YES
YES
O
N
C 1012,L1015,C 1002 contact?
O
N
O
N
O
N
O
N
re s o lder or change
re s o lder or change
re s o lder or change
L
1006,C 1015,C1019
res olde r o r cha ng e
S
GH-S300 Flow Chart of Troubleshooting and C ircuitDiagram s
CHECK
C
N1001
F
1002
F
1005
YES
U
901
pin 1 2,13 ¡ˆ
O NO
N
YES YES
U 901 CH EC K
pin14,23,26,32 :
NO
YES
U 901 Pin3,4
V p-p:240m V ?
NO
YES
U 901 Pin1,2
V p-p:250m V ?
NO
YES
U900
Pin2,3,4,5
YES
U 902 CH EC K
pin5,25,28 : 3V ?
U902 CHECK
pin 7 : 13 M H z?
YES
U 902
ch ang e or re so lder
U 100, PIN 46, C114
re s o lder or change
U900 CHECK
pin 6 ,20 : 2.8V ?
YES
U 900
re s o lder or change
U 100, PIN 39, C116
check or resolder
NO NO
OSC 801
CHECK
pin3:13MHz?
YES
C 808, R805
res olde r
NO
NO
OSC801
CHECK
pin4:clean
YES
O SC801
ch an ge
NO
L1006,C 1015,C 1019
reso lder or change
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6- 9
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