Afc Voltage Troubleshooting - Nokia 6255 Rf Description And Troubleshooting

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AFC Voltage Troubleshooting

Use the following steps to monitor the AFC voltage.
1. In Phoenix, open the RF PDM dialog box.
Figure 45 shows a partial schematic of 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
Issue 2 05/2005
Figure 44: RF PDM dialog box for AFC troubleshooting
Figure 45: Partial schematic showing the R7205
©2005 Nokia Corporation
6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting
Company Confidential Page 55