User Guide

NSW-4
Disassembly & Troubleshooting
PAMS Technical Documentation
Page 41
Issue 1 Final Draft
08/00
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19.44 MHz oscillator
Ty eYourNameHere Ty eDateHere
VCTCXO
OUTPUT :
19.44 MHz
G850
P:>0.8Vpp
Change G850
N
Check
AFC–signal from
G850, pin1
V
≅
1.05 V
Note!
Check all soldering and supply voltages
for VCTCXO and RFC–buffer.
Check also coil L850.
Check resistor
R851
Check 2G PLL
N880, pin 15
P: >0.8 Vpp
Change capacitor
C854
Check
RFC–buffer
output, C719
P: >0.3 Vpp
Check L762 and
C745.
Check 3X tank
N700, C745
P: >150 mVpp
N
Y
Y
N
Check EROTUS
supply voltages.
N
Start BB
troubleshooting.
N
Y
Y
N
Change
EROTUS.
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