19.44 Mhz Osc. Troubleshoolting - Nokia NSW-5 Series Service Manual

NSW-5
Disassembly and Troubleshooting Instructions

19.44 MHz Osc. Troubleshoolting

VCTCXO
N
OUTPUT :
19.44 MHz
G850
P:>0.6Vpp
Y
Check
N
AFC–signal from
G850, pin1
V ≅ 1.05 V
Y
Check
N
RFC–buffer
output, C719
P: >0.3 Vpp
Y
N
Check 2G PLL
N880, pin 15
P: >0.6 Vpp
Y
Check 3X tank
N
N750,C745,L762
P: >150 mVpp
Y
Change
EROTUS.
Page 46
Note!
Check all solderings and supply voltage
Change G850
for VCTCXO.
Check also coil L868.
Y
Check resistor
R850
Check capacitor
C851
Check L762 and
C745.
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Start COBBA_D
trobleshooting
Check EROTUS Check
N
OSC input,pin 24 capasitor C883
P:>0.6Vpp
Y
Check EROTUS Start BB
N
supply voltages troubleshooting
Y
.
Issue 1 10/00