Specifications

connection can cause a drive phase problem on an RF
module. Substitution is the only way to troubleshoot this
problem.
G.7.6
Excessive Drain Phase Difference
a. Measure the drain phase on the RF Ampifier using the
procedure provided in Section V.
b. If a module is out of specifications on drain phasing, first
substitute a new module.
c. If the module is not the problem the drive phasing should
be checked.
d. The only other cause of drain phasing problems on a
module would be the MOSFETs themselves. Substitution
is the only way to troubleshoot this problem.
G.7.7
Open Fuse Sensing Failure
If the Control front panel displays an RF AMP fuse fault and it
has been traced to a failure in the module sensing, use an
ohmmeter and check diodes CR11, CR12, CR25, CR17, CR18,
CR19, CR20. Check C11 and C12 for a short if the diodes test
correctly.
CH1 P1-50
CH2 Q7 Gate
CH1 P1-50
CH2 Q8 Gate
CH1Q7Gate
CH2 Q8 Gate
CH1Q7Gate
CH2 Q8 Gate
(RFA OFF)
G-8 888-2339-002
WARNING: Disconnect primary power prior to servicing.