Fault Finding Chart For 13 Mhz Oscillator - Nokia NSB-1 Series Troubleshooting Instructions

NSB–1/3
Troubleshooting Instructions

Fault finding chart for 13 MHz oscillator

N
PLUSSA pin21:
13MHz
Vpp:0.6V
N
Check
AFC–signal from
C720:1.1V
N
Check
RFCLK–signal from
L701: f:13MHz
P:5dBm Vpp:0.84V
Check PLUSSA (N401)
pin 54 (SCLK):2.8V
pin 55 (SDATA):2.8V
pin 56 (SENA):2.8V
SENA is 0 during SCLK
and SDATA
Page 16
N
Check AFC–signal
from R714 and
C720:1.1V. Check
VVCXO–signal from
C721:2.8V.
Goto BB
troublesh.
Check C722. Check V710;
c:13MHz Vdc:0.95V Vpp:0.8V
b:13MHz Vdc:0.6V Vpp:0.1V
N
Goto BB
troublesh.
Technical Documentation
Goto BB
troublesh.
N
Check R717 and C721:2.8V
Check R707,R706 and C760
PAMS
Original 06/98