Transmitter Principle And Troubleshooting - Philips CT6558 Tuning Up Procedure & Operational Manual

PHILIPS
Tuning Up procedure & Operational Manual
Step3: Measure the input signal and output signal of BPF. If the input signal is wrong, check on 2011: EGSM and
2015: DCS, 2014:PCS. If the output signal is wrong , check the filter 5010：EGSM，5014：DCS, 5012:PCS: 2014
Measure I/Q signal output from 7130. If the signal is not good, check if there are defects on
Step4:
7130. Also need check the working voltage of 7130.
Step5: Measure I/Q Signal input to CPU, Otherwise change 7300.

5.2.2 Transmitter principle and troubleshooting:

Transmitter circuit signal flowing chart:
Antenna
7300
CPU
I&Q
MIC
7010
U501
RF CONN RF_SW
Balun
7130
Balun
13
Revision :
Date :2004-9-7
Page No. : Page 13 of 13
DCS_PCS
PA
&
EGSM
Power Control Loop
EGSM
DCS_PCS
01
7011