LG MX8550 Service Manual page 76

MX8550
4.2.2 PCS Tx
PCS_Tx
SAW filter
Press "##5473784236368" + "SEND" key + "000000" in
Phone idle state.
? Press "5" to enter FCC Test
? Press "2" to enter PCS FCC mode
- Set channel to 600 and AGC to 360
? Measure frequency domain waveform with Spectrum
analyser
? Measure time domain waveform with Oscilloscope
1. Check
DC Power Supply circuit
2. Check
VCTCXO
3. Check
RFT6150
LG Electronics Inc.
Mobile S/W
Dual PAM
VCTCXO
RFT6150
<VX8550 PCS Tx>
Circuit Diagram
Circuit Diagram
Start
Test Point
Test Point
Diplexer
PCS Duplexer
4. Check
RF SAW
5. Check
RF Dual PAM
6. Check
Duplexer
7. Check
Diplexer
NO
8. Check
Mobile Switch
Redownload S/W, Cal
- 75/148 -