Fault Finding Chart For Bb Pll - Nokia NPM-2NX Troubleshooting Manual

CCS Technical Documentation
TDMA mode and 78 MHz in GSM mode. Next picture shows BB PLL working.
19.2 MHz
VCTCXO
Divider
65 or 80
* Data
RF-IC
*Data are related to vctcxo frequency and mode selections.

Fault finding chart for BB PLL

Measure oscillator frequency over L829 coil. Don't connect probe to pads!
TDMA -> BB PLL frequency 77.76 MHz
Issue 1 07/02
Freq/Phase
comparator
Divider
324 or 325
Divider 4 or 6
RFCLK to BB
GSM 13 MHz
TDMA 19.44 MHz
ãNokia Corporation
Troubleshooting
Charge Pump
Varactor
Active
Resonator
part
BB VCO
NPM-2NX
Loop Filter
Page 57