User Guide

6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting Nokia Customer Care
Page 52 ©2005 Nokia Corporation Company Confidential Issue 2 05/2005
Synthesizer Troubleshooting Setup
Use the following steps to troubleshoot the synthesizer using Phoenix:
1. On the Phone Control dialog box, click the LOCAL button in the Phone State
area to put the mobile terminal into Local Mode.
Figure 42: Phone Control dialog box
2. Select the following values on the RF Main Mode dialog box:.
Incorrect PLL Frequencies
Following are some possible causes for incorrect PLL frequencies:
• Power supplies to PLL portion
• Control line to VCO
• Loop filter or resonator components missing or incorrectly installed
• 19.2MHz reference clock missing or low
• Component failure (PLL IC, N7100, N7000, VCO, or VCTCXO)
Table 14: RF Main Mode Dialog Box Settings
Synthesizer Band Mode Channel
UHF
Cell Rx/Tx 384
PCS Rx/Tx 600
Rx VHF (one band is enough) Rx
Tx VHF Cell Rx/Tx 384
PCS Rx/Tx 600