- 101 -
4.14 HFK Trouble
SETTING : After initializing GSM test equipment, Connect PIF to the phone, and power on.
START
Change HFK.
Voltage at R337 is 0V ?
Can you hear your
voice from the HFK?
Yes
No
No
Change the HFK and
try again.
Resolder R337 & CN302.
Yes
Set the audio part of the test
equipment to echo mode.
Connect HFK to the phone.
No
Does the
audio profile of the phone
change to the car-kit
mode?
Redownload software.
HFK will be work properly.
Set the audio part of the test
equipment to PRBS or
continuous wave mode.
HFK detect problem.
Audio path problem.
HFK receiving path
problem.
HFK sending path problem.
Yes
④
No
Yes
Can you hear your
voice from the HFK?
Yes
Yes
Yes
Can you hear your
voice from the HFK?
②
①
No
HFK receiving path problem.
Yes
Check the HFK again.
No
Resolder or replace U203 & U204.
Redownload software.
Yes
Change the main board.
①
Is the signal
level at pin 9 & 10 of
CN302 a few tens or
hundreds
mV(AC)?
③
Is the signal
level at pin 5 of U203 & U204
a few tens or hundreds
mV(AC)?
No
Yes
Does it work well?
Yes
No
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 ...