User Guide

PAMS
Technical Documentation
NSE–6
Disassembly & Troubleshooting Instructions
Page 24
Original 08/98
Receiver Fault (3)
2nd IF
13 MHz
N540 pin 8
SL: – 28 dBm
N540 pin 30,
SL: – 19 dBm
N540 pin 35
~2.8V
Check VRX supply voltage
N540 pin 36
~1.2V
Check RXC control voltage
from COBBA pin 18
Change N540
VHFLO
Z540 input
SL: –26 dBm
Check R540 and soldered
joints
Z540 output
SL: –28 dBm
Check soldered joints, if OK
change Z540
N540 pin 26, SL: –36 dBm
and pin 25 , SL: –33 dBm
N540 pin 25 and 26,
DC–level, ~1.4V
Change
N540
Check R541 and R542
N540 pin 23 and 24
SL: – 29 dBm
Change N250 (Cobba)
N540 pin 23 and 24
DC–level ~1V
Change N540
YES
YES
YES YES YES
YES
YES
YES YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Change N250 (Cobba)