User Guide

PAMS
Technical Documentation
NSE–1
Disassembly & Troubleshooting Instructions
Page 25
Original 03/98
Receiver Fault (7)
AFC
RSSI tuning working OK ?
Receiver
Fault
N250 pin 19,
voltage between 0.5 – 2.3V
N250 pin 19,
loading > 1 M
Ω
Check AFC–line(J520) for
short circuits, if OK change
Set SpectrumAnalyzer
Frequency: 13 MHz
Span: 10 kHz
RESBW: 3 kHz
Change N620
13 MHz in midst,
(Test point J 506)
Use sevice software to set AFC
to MAX
AFC–voltage(J520),
~2.3V
Main clock(J506),
> 13 MHz
Check R600 and C602, if
OK change N250
Change G600
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NOTE !
If DSP in MAD does not work
properly, supply voltages stays
down.