Nokia NEM-4 Series Troubleshooting Instructions page 86

NEM-4
RF Troubleshooting
Antenna Switch Control Line During EGSM Transmission
Antenna Switch Control Line (CONT3) During EGSM Transmission
EGSM Tx fault finding flow chart
The first flow diagram assumes the following:
• Phoenix has been set up as shown on page 24 (the Tx power level may be
increased using Phoenix if it makes the Tx pulse easier to see).
• Relevant components have been visually inspected for orientation, placement,
etc.
• The transmit signal has been checked with a spectrum analyzer at RF connector,
X602 and was found to be too low or non-existent.
• The VCO is running correctly.
Page 6(b)-82
Company Confidential
Transmit Timing
Copyright  2003 Nokia Corporation.
Company Confidential
CCS Technical Documentation
TXIOUTP
TXC
VTXB_900
Antenna Switch
CONT 3
Issue 1 09/2003