Nokia 6015 Troubleshooting - Rf page 51

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The Frequency Calculator dialog box appears.
Figure 43: 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 100KHz. The LO should be virtually
immobile.
3. Measure for nominal UHF LO signal levels using and RF probe. (See Figure 42 on
page 49 and Table 12, "UHF Synthesizer Probe Point Values and Descriptions," on
page 50.)
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 08/2004
6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
©2004 Nokia Corporation
Troubleshooting - RF
Company Confidential Page 51