Synthesizer Troubleshooting Setup; Incorrect Pll Frequencies - Nokia 6255 Rf Description And Troubleshooting

6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting

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.
2. Select the following values on the RF Main Mode dialog box:.
Synthesizer
UHF
Rx VHF
Tx VHF

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)
Page 52
Figure 42: Phone Control dialog box
Table 14: RF Main Mode Dialog Box Settings
Band
Cell
PCS
(one band is enough)
Cell
PCS
©2005 Nokia Corporation
Nokia Customer Care
Mode Channel
Rx/Tx 384
Rx/Tx 600
Rx
Rx/Tx 384
Rx/Tx 600
Company Confidential Issue 2 05/2005