Afc Voltage Troubleshooting - Nokia 3155 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 43
2. Measure the DC voltage at R7205. The following typical voltages are shown in
Figure
• 1 = AFC PDM[-1024]=0V
• 2 = AFC PDM[0]=1.2V
• 3 = AFC PDM[1024]=2.4V
ISSUE 1 07/2005
Figure 42: RF PDM dialog box for AFC troubleshooting
shows a partial schematic of the R7205.
Figure 43: Partial schematic showing the R7205
44.
©2005 Nokia Corporation
3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting
Company Confidential Page 51