PAMS
Technical Documentation
NSC/W–1/3
Disassembly & Troubleshooting Instructions
Page 26
Original 11/99
Check IN_rx level
Check Resistors R743
&R744
Check OUTP_rxif level
P:~–13 dBm
Change PLUSSA
Note !
Check all discrete components and
supply voltages of PLUSSA .
Check also AGC1 line.
Check COBBA_D IF2D
P:~–13 dBm
Change capacitors
C790 & R789
Check input of
IF amplifier
P:~–35 dBm
Change Z741
Note!
Check all components around of filter,
Measure IF–amplifier biasvoltage, should
be about 1.3 V if not change V741
N
Y
N
Y
N
Y
N
Check MXR IF level,
F= 116.19 MHz
P:~–38 dBm
Change N721
Note!
N
Y
Change N721
Start synthesizer
troubleshooting
Check input level fo
front end N721, pin 1
f=2076.21 MHz
V741
N750, pin 29, 30
N750, pin 51, 52
N250, pin 9, 10
Check all components
around N721
P:~–35 dBm