PAMS
Technical Documentation
NSC/W–1/3
Disassembly & Troubleshooting Instructions
Page 24
Original 11/99
Check IN_rx level
P:~–39 dBm
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. (TP10LU)
Check COBBA_D IF2D
N250, pin 9, 10
P:~–13 dBm
Change capacitors
C790 & R789
Check input of
IF amplifier
P:~–40 dBm
Change Z741
Note!
Check all components around of filter,
Measure IF–amplifier biasvoltage, should
be about x.x V if not change V741 (TP8LU)
N
Y
N
Y
N
Y
N
Change N701
Note!
Check MXR IF level,
F= 116.19 MHz
P:~–42 dBm
N
pin 14
Start synthesizer
N
troubleshooting
Check input level of
front end N701,
pin 1
f=995.19MHz
Y
Y
N750 Pin 29,30
N750, pin 51, 52
V741