PAMS
Technical Documentation
NSC/W–1/3
Disassembly & Troubleshooting Instructions
Page 22
Original 11/99
Check IN_a level
Check Resistors R743
&R744
Check LIMOUT1
output pin 32
Change PLUSSA
Note !
Check all discrete components and
voltages around of PLUSSA
Check COBBA_D IF2A
Input (TP9L)
V:~250mVpp
Change resistors R788
& R789
Check input of
IF amplifier
P:~–20 dBm
Change Z741
Note!
Check all components around of filter,
Measure IF–amplifier biasvoltage (TP8LU)
, should be about x.x V if not, change
V741
N
Y
N
Y
N
Y
N
N750, pin 49, 50
V741
Check MXR IF level,
F= 116.19 MHz
P:~–22 dBm
Change N701
Note!
Y
N
Y
Change N701
Note!
Y
Check input level
of front end N701
pin 1
f=995.19MHz
Start synthesizer
troubleshooting
Check all components around of N701
V: ~250mVpp
pin 14
P:~–20 dBm