User Guide

Nokia Customer Care RF Description and Troubleshooting
6255/6255i/6256/6256i (RM-19)
Issue 2 05/2005 ©2005 Nokia Corporation Company Confidential Page 55
AFC Voltage Troubleshooting
Use the following steps to monitor the AFC voltage.
1. In Phoenix, open the RF PDM dialog box.
Figure 44: RF PDM dialog box for AFC troubleshooting
Figure 45 shows a partial schematic of the R7205.
Figure 45: Partial schematic showing the R7205
2. Measure the DC voltage at R7205. The following typical voltages are shown in
Figure 46.
• 1 = AFC PDM[-1024]=0V
• 2 = AFC PDM[0]=1.2V
• 3 = AFC PDM[1024]=2.4V