Incorrect Pll Frequencies - Nokia 6235 Troubleshooting Manual

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The level of 19.2MHz is also important because the D2800 is very sensitive and
can pick up a weak 19.2MHz clock. This can result in intermittent problems, such
as constant phone reset.
• The synthesizers for 6235/6235i/6236i are:
Synthesizer
Dual Band UHF
Rx VHF
Tx UHF

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)
Issue 1 04/2005
Table 8: Synthesizers for 6235/6235i/6236i
Band Channel
Cell and AMPS 1009.62 MHz at CH384
PCS 2088.10 MHz at CH600
Cell, AMPS and PCS 256.2 MHz
Cell and AMPS 3298.16~3395.88 MHz
PCS 3700.00~3819.90 MHz
©2005 Nokia Corporation
6235/6235i/6236i (RM-60)
RF Description and Troubleshooting
PLL
separate LMX2310 PLL IC
inside N7100 IC
inside N7000 IC
Company Confidential Page 47