19.44 Mhz Oscillator - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

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NSW-6
Disassembly & Troubleshooting

19.44 MHz oscillator

VCTCXO
N
OUTPUT :
19.44 MHz
G850
P:>0.8Vpp
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: >0.8 Vpp
Y
Check 3X tank
N
N700, C745
P: >150 mVpp
Change
EROTUS.
continues next page
Page 42
Note!
Check all soldering and supply voltages
Change G850
for VCTCXO and RFC–buffer.
Check also coil L850.
Check resistor
R851
Check EROTUS
N
supply voltages.
Change capacitor
C854
Check L762 and
C745.
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