Samsung SGH-E300 User manual

GSM TELEPHONE
SGH-E300
GSM TELEPHONE CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded Views and Parts List
4. Electrical Parts List
5. Block Diagrams
6. PCB Diagrams
SERVICE
Manual

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1. SGH-E300 Specification
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1-1
GSM900
Phase 1 EGSM 900 Phase 2 DCS1800 Phase 1
Freq. Band[MHz]
Uplink/Downlink 890~915 935~960 880~915 925~960 1710~1785 1805~1880
ARFCN range 1~124 0~124 &
975~1023 512~885
Tx/Rx spacing 45MHz 45MHz 95MHz
Mod. Bit rate/
Bit Period 270.833kbps 3.692us 270.833kbps 3.692us 270.833kbps 3.692us
Time Slot
Period/Frame Period 576.9us 4.615ms 576.9us 4.615ms 576.9us 4.615ms
Modulation 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm
Power Class 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm
TDMA Mux 8 8 8
Cell Radius 35Km 35Km 2Km
1. GSM General Specification

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SGH-E310 Specification
1-2
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TX Power
control level GSM900
5 33±2dBm
6 31±2dBm
7 29±2dBm
8 27±2dBm
9 25±2dBm
10 23±2dBm
11 21±2dBm
12 19±2dBm
13 17±2dBm
14 15±2dBm
15 13±2dBm
16 11±3dBm
17 9±3dBm
18 7±3dBm
19 5±3dBm
TX Power
control level DCS1800
0 30±3dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
2. GSM TX power class

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2. SGH-E300 Flow Chart of Troubleshooting
2-1
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1.Baseband
1. Power ON
Check the current
consumption more
than 100mA
'Power On' does not work
Check the Voltage
more than 3.3V
Download again
Charge the Battery
Check the pin
11 of U102 is more
than 2.8V
Check U102 and C117
U102 pin 33,39
=2.8V Check U102 and C116
Check the clock
signal at pin4 of
OSC801
Freq=13MHz ?
Vrms≥300mV ?
Vpp is around
900mVpp ?
Check the clock generation
circuit
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
U102 pin 9
=1.8V
No
Yes

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-2
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2. Initial
3. Sim Part
Check the signal at the
pin19ofU102is
"High" when the phone
is boot on
Initial Failure
Check U102
END
No
Yes
Check the pin 25 of
U100 is "High"
Yes
Check the U701
Check the pin 4 of
OSC801 is around 2.8V
Check the soldered status of
OSC801,R801,U102
Yes
No
Yes
Check LCD connector CN201,
and resolder bridge
Yes
No
Check the pin 1 of
CN100. voltage 3V ?
Phone can't access SIM card
Check the SIM
connector's (CN100)
connection to SIM
card
Check the circuit related to
U102
Resolder or change CN100
Check the circuit around CN100
input
circuitry
END
No
Yes
Yes
Yes
Yes
No
Check the related circuit of
CN100
No
Check the circuit around U601
output
and vlotage supply circuitry
Yes
Check the related circuit of
U601 and U102
No

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-3
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4. Charging Part
Check the pin 17, 18
of CN300 is
TA_VEXT>4?
Abnormal charging part
Check the pin 2 of
Q102 is "low"?
Replace TA,Check CN300
Check the Q102
Check the Q100
END
No
Yes
Yes
Yes
Yes
No
No
Check the pin 3 of
Q100 is "low"?
Check the pin 5 of
Q102 is "3.2~4.2V"? Check the Q102
No
Yes
Check the ICHRG is
1V(during charging)
and around 180mV(full
charging)?
No
Resolder or change R102
Yes

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-4
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( Picture 1)

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-5
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(Picture 2)

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-6
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(Picture 3)

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-7
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5. Microphone Part
6. Speaker Part
check the soldered
status of microphone.
Microphone does not work
Check the reference
voltage on mic path
C431 ≒ 2.5 V
Resolder microphone
Resolder or change
R424,C431,R413,C410,R408,R411
END
No
Yes
Yes
Yes
Yes
No
Is microphone ok?
No
Check U701
Check the connection
from CN201 to LCD
module
Speaker does not work
Check the PIN 4 of
U401='High' and
U409='High'?
Check the circuit related to U401
Check U601
Is speaker ok?
Check U701
END
No
Yes
Yes
Yes
Yes
No
No
Is speaker ok?
Change Speaker
Yes
No