Nokia RH-66 Troubleshooting Manual page 37

Nokia Customer Care
The Frequency Calculator dialog box appears.
Figure 28: Frequency Calculator dialog box for Cell (top) and PCS (bottom)
2. Check to see if the LO is locked. Set a channel and check the output of the UHF
LO at L502 within a very narrow span of 100 KHz. The LO should be virtually
immobile.
3. Measure for nominal UHF LO signal levels using an RF probe.
4. If you do not see the presence of any LOs, check the DC voltages at the following
locations:
• VR1A (R503), the supply line for UHF_PLL_IC, should be 4.76 VDC
• VR4 (R510), supply line for VCO_IC, should be 2.76 VDC
5. Check lock voltage at C514, which should be between 1 and 3 V.
6. Check the RF return at R504.
Issue 1 03/2005
©2005 Nokia Corporation
2115i/2116/2116i (RH-66)
RF Description and Troubleshooting
Company Confidential Page 37