Vctcxo Troubleshooting - Nokia 6265 Rf Description And Troubleshooting

6265/6265i/6268 (RM-66)
RF Description and Troubleshooting

VCTCXO Troubleshooting

• VCTCXO frequency is 19.2MHz. Without 19.2MHz, the mobile terminal does not
power up. This signal goes to the N7100, N7000, D2800, and the UHF PLL. Check
the test points in
• Check for the presence of the signal at the following points:
• F_REF_TX, clock reference to TX RFIC, should be ~-9 dBm
• F_REF_RX, clock reference to RX RFIC, should be ~-9 dBm
• CLK19M2_TIKU, clock reference for BB, should be ~-9 dBm
• ~2 dB less in the other side of R7206.
• If there is no VCTCXO signal at any of these points, check the voltage at VR3. The
main supply line for VCTCXO should be 2.78VDC.
• The AFC voltage should be between 1 and 3 Volts and should be adjustable with
the AFC slider on the RF PDM Control in Phoenix.
• If the AFC voltage is missing, check the UEMEK.
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Figure 41 for the presence of the 19.2MHz signal.
©2005 Nokia Corporation
Company Confidential Issue 1 11/2005