5-15
Troubleshooting
YES
YES
END
NO
YES
NO
NO
Check
TX VCO U202 pin 24
frequency & power.
Frequency = 1747.8 MHz?
Power -7dBm?
Check :
• U202 soldering
• U202 pin 26 = DC 2.85V
Replace U202 if defective.
Check :
• U101 soldering
• U101 pin 4 VBAT = DC voltage ( > 3.3V)
• U101 pin 3 PAON = high voltage
• U101 pin 2 BSW = high voltage
• U101 pin 6 PA_LEVEL signal
• U101 pin 7 1747.8 MHz freq & power
Replace U103, U101 if defective.
Check :
• U110 soldering
• U110 pin 2 = low voltage
• U110 pin 11 = high voltage
Replace U110 if defective.
Check
Power Amp Output C122
frequency & power.
Frequency = 1747.8 MHz?
Power 12dBm?
Check
U110 pin 8
frequency & power.
Frequency = 1747.8 MHz?
Power 15dBm?
YES
YES
Check :
• RF connector ANT101 soldering.
• Matching network L100, C121, C105 soldering.
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Содержание GSM ST11
Страница 1: ...GSM PHONE SERVICE MANUAL MODEL ST11 ...
Страница 2: ...Rev 1 00 ...
Страница 6: ...1 2 Introduction Memo ...
Страница 15: ...3 4 Exploded View and Parts List 3 4 1 Exploded View 3 5 ...
Страница 41: ...Troubleshooting Memo 5 20 ...
Страница 42: ...6 Block Diagram 6 1 BB Block Diagram 6 1 ...
Страница 43: ...6 2 Block Diagram 6 2 RF Block Diagram ...
Страница 51: ...7 8 Schematic Diagram Memo ...
Страница 52: ...8 PCB Diagram 8 1 Main PCB 8 1 Top View ...
Страница 53: ...8 2 PCB Diagram Bottom View ...
Страница 60: ...9 7 Electrical Parts List Memo ...