Synthesizer Troubleshooting; Synthesizer Setup - Nokia RH-77 Troubleshooting Manual

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Synthesizer Troubleshooting

Faulty synthesizers can cause both Rx and Tx failures during tuning, in addition to the
VCTCXO tuning. The following synthesizers are incorporated into the mobile terminal:
• UHF (cell) PLL inside N601 IC
• Tx VHF (457.2MHz) with PLL in N601 IC in Cell Mode
• Tx VHF (527.2MHz) with PLL in N601 IC in PCS Mode
• Rx VHF (367.2MHz) with PLL in N700 IC

Synthesizer Setup

Use the following steps to set up the mobile terminal for Tx troubleshooting in Phoenix.
1. Open the Phone Control dialog box.
Figure 20: Phone Control dialog box for Tx troubleshooting
2. Click the LOCAL button in the Phone State area to put the mobile terminal into
Local Mode.
3. Use the following settings for the Band, Channel, and Mode fields on the RF
Main Mode dialog box:
• UHF: Use the Rx/Tx mode and channel 384 in Cell band. This allows you to
check power in both the Rx and Tx circuits.
• Rx VHF: Use the Rx mode. One band is enough.
• Tx VHF: Use the Rx/Tx mode in Cell band.
Issue 01 04/2005
©2005 Nokia Corporation
RF Description and Troubleshooting
Company Confidential
2118 (RH-77)
Page 31