- 98 -
Voltage at pin9 of
U205 1.5~1.9V?
Resolder or replace U205.
No
Earphone sending path
problem
Yes
Yes
No
Does it work well?
Re-download software.
Change the main board.
Is the
signal level across L201
about 1.5 to
1.9V?
Yes
Resolder L201.
③
Is the
signal level at pin9, pin11
of U205 about
1.5 to 1.9V?
No
Is the
both signal level at pin9,
pin11 of U205 about
1.5 to 1.9V?
Yes
Yes
No
Does it work well?
④
No
Yes
4. TROUBLE SHOOTING
Summary of Contents for G3100
Page 32: ... 34 3 TECHNICAL BRIEF Figure 3 20 TX IQ Signal Figure 3 21 RX IQ Signal ...
Page 40: ... 42 Figure 3 26 1 Voice band circuit diagram Headset Hands free kit part 1 3 TECHNICAL BRIEF ...
Page 42: ... 44 Figure 3 27 AD6521 circuit diagram 3 TECHNICAL BRIEF ...
Page 73: ... 75 4 3 8 Receiver RF Level Figure 4 1 Test Points of Rx Level 4 TROUBLE SHOOTING ...
Page 74: ... 76 4 3 9 Transmitter RF Level Figure 4 2 Test Points of Tx Level 4 TROUBLE SHOOTING ...
Page 81: ... 83 The Receiver part Circuit Diagram C203 C207 C206 4 TROUBLE SHOOTING ...
Page 87: ... 89 R202 MIC201 R204 C204 C201 R208 R206 C208 Q203 4 TROUBLE SHOOTING ...
Page 93: ... 95 Test SIM Connector Check J301 4 TROUBLE SHOOTING ...
Page 97: ... 99 J201 R240 C234 L201 R241 4 TROUBLE SHOOTING U205 U203 U204 ...
Page 101: ... 103 CN302 U203 U204 4 TROUBLE SHOOTING ...
Page 102: ... 104 U205 4 TROUBLE SHOOTING ...
Page 117: ... 119 9 PCB LAYOUT 9 1 Rear Part ...
Page 118: ...9 2 Front Part 120 ...
Page 134: ... 137 13 EXPLODED VIEW REPLACEMENT PART LIST 13 1 Exploded View ...