Dcs Transmitter - Samsung SGH-A500 Service Manual

SGH- A500 Flow Chart of Troubleshooting and Circuit Diagrams

12. DCS transmitter

YES
OSC202
OSC202
CHECK/
PIN4=2.8V?
CHANGE
NO
U601
CHECK/
CHANGE
YES
OSC201
OSC201
CHECK/
PIN7=2.8V?
CHANGE
NO
U601
CHECK/
CHANGE
U201
CHECK/
CHANGE
YES
OSC101
OSC101
C H E C K /
PIN5=2.8V?
CHANGE
NO
U601 CHECK/
CHANGE
CN101 CHECK/
CHANGE
7&19=2.8V?
YES
OSC202
NO NO
PIN3=13MHz PIN25=1.3~
2.76Vrms? 1.5Vpp?
YES
OSC101
YES
PIN10>5
dBm(1747.4
OSC201
NO
YES
PIN1=1323.4
MHz(-5~3
dBm)?
PIN3>4
YES
dBm(1747.4
YES
U201
NO
PIN28>-14 PIN12=19~21
dBm(1747.4 dBm(1747.4
MHz)?
YES
YES
OSC101
NO
PIN10>5
dBm(1747.4 PIN7=19~21
dBm(1747.4
MHz)?
YES
YES
F105
CHECK/
CHANGE
PIN8=18~21
dBm(1747.4
YES
CON101
NO
PIN1=18~21
dBm(1747.4
MHz)?
YES
ANT1
CHECK/
CHANGE
SAMSUNG Proprietary-Contents may change without notice
U201 NO U601
PIN CHECK/
CHANGE
U201
NO
YES
NO
OSC101
PIN5=2.8V?
MHz)?
F102
NO F101
CHECK/
CHANGE
MHz)?
NO
U103 U103
YES
NO
PIN6&8=
3.4~4.2V
MHz)? ?
U601
F103
NO
F103 CHECK/
CHANGE
CHECK/
CHANGE
MHz)?
U101
U101
NO NO
PIN2=2.5~2.8V
&PIN11=0~0.5V
?
MHz)?
YES
U101
CHECK/
U104&U105
CHANGE
PIN4=2.8V
?
NO
YES
U104&U105 U601
CHECK/ CHECK/
CHANGE CHANGE
6- 10
CONTINUOUS Tx ON
CONDITION
CH : 698
Tx POWER LEVEL : 5
RBW : 300KHz
VBW : 300KHz
ATT. : 30dB
OSC101
CHECK/
CHANGE
U103
BATTERY
CHECK/
CHECK/
CHANGE
CHANGE
YES
U103
YES
U103
PIN14=
PIN16>2.5V
1.2~1.4V
?
?
NO NO
U201
CHECK/
NO
U102
CHANGE
PIN10=2.8V
?
YES
F104
F103
NO
PIN4>1747.4
CHECK/
MHz(-21dBm)
CHANGE
?
YES
NO
U102
F104
PIN5>1747.4
CHECK/
MHz(-30dBm)
CHANGE
?
YES
U102
CHECK/
CHANGE