Transmitter Rf Troubleshooting Procedures - Nokia 6235 Troubleshooting Manual

6235/6235i/6236i (RM-60)
RF Description and Troubleshooting
14. Click Read Phone to update the values.

Transmitter RF Troubleshooting Procedures

After Phoenix is set up using either the AMPS, Cell, or PCS setup procedures, use the
following steps to troubleshoot the transmitter.
1. Using a voltmeter, check to see that all VR2, VR6, and VR1B are on the transmit
system. (See
• If any are missing, look for SMD problems around the N7000 and the UEME.
• If SMD is good, replace the UEME.
2. Once all DC voltages are present, check the AGC control voltages. (See
Setup" on page 11,
• If the voltages are incorrect, check the SMD around TX_AGC1 and TX_AGC2.
• If the SMDs are correct, replace the D2800.
3. Using an oscilloscope, check the input modulation BBIQ wave forms at R7021,
R7022, R7023, and R7024. They should all be present with an AC swing of about
500mVpp, with an offset of +1.2V.
• If one or more waveforms are missing, look for SMD problems around these
resistors.
• If the SMD is good, replace the UEM.
Page 18
Figure 13: RF PDM Control dialog box for PCS band
"Tx DC Test Points" on page 22.)
"Cell Tx Setup" on page 14, or
©2005 Nokia Corporation
"PCS Setup" on page 16.)
Company Confidential
"AMPS Tx
Issue 1 04/2005