Samsung SGH-E770 - DCS & PCS Transmit Path Diagnostics

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SGH-E770 Flow Chart of Troubleshooting
2-22
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2-2-5. DCS & PCS TX
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C100
=3.7V?
Change PAM101
NO
YES
F100 Pin#6
About 2~3 dBm?
F100
Pin#16 = High?
UCP301
Check & Change
NO
RFS100, C10
Check & Change
YES
F100
Check & Change
YES
Check the
Battery Block
Level of PAM101
Pin #30 is
1.2V?
Check
UCP301 TXP OK ?
UCP301
Check & Change
YES
YES
NO
NO NO
NO
PAM101 pin#19
About -5 dBm?
PAM101 pin#45
High ?
Check UCP301
YES
NO
YES
UCD100 Check
Pin#15,16,23,27,31
≥
2.8V ?
UCD100 Check
Pin #17 : 13MHz ?
Vpp : 1.1V?
R118 = 13MHz ?
Vpp : 1.2V?
R116 = 1.5V ?
NO
YES
NO
NO
NO
C141, R118
resolder
OSC101
Change or resolder
YES
YES
YES
NO
C17,18,114,152,UCP301
Check or resolder
UCD100 Pin
#4, = 1.7V?
YES
Change PAM101
Check UCD301
NO
YES
Level of
F100 Pin#7 is
4~5dBm ?