08_GT-C3350-TSHOO-7.pdf

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8. Level 3 Repair
8-1.Block Diagram
8-1
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Level 3 Repair
8-2. PCB Diagrams
8-2-1. Top
8-2
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Level 3 Repair
8-2-2. Bottom
8-3
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Level 3 Repair
8-3. Flow Chart of Troubleshooting
Equipments
Oscilloscope
Digital Multimeter
Power Supply
+ driver, ESD Safe Tweezer
8960 & Spectrum Analyzer
Soldering iron
8-4
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Level 3 Repair
8-3. Flow Chart of Troubleshooting
8-3-1. Power On
Power switch on
Check the current
consumption
>= 100mA?
Yes
Check the battery
voltage
VBAT >= 3.45?
Yes
Check the voltage
VDD_1.8V(C232)
= 1.8V?
Yes
Check the clock at
OSC201 = 26MHz
?
Yes
END
NO
Download
NO
Change the battery
NO
Check the Main Chip (UCP200)
Look over the Chip damage
NO
Resolder OSC201
8-5
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