12/24/07
888-2685-001
5-7
WARNING: Disconnect primary power prior to servicing.
Section 5 Replacement Procedures
Ranger Commissioning Manual
5.4
Circulator Removal/Replacement
The circulators are mounted on an adjustable plate behind the PA modules. It is very
important that when they are replaced that they are mounted correctly or the module
may not seat properly in the circulator. If mounted too far forward, the circulator could
actually hold the module out so that it does not seat properly in the lower module
connector which carries PS, signal and control causing the module not to operate or
become intermittent.
STEP 1
Shut the transmitter off along with the breaker on the power supply.
STEP 2
Pull the PA modules out a few inches to disengage them from the rear
connectors.
STEP 3
Mark the adjustable plate shown in Figure 5-5 for front to back position
(F) on the top as shown and on the bottom. This will make re-assembly
much easier and increase confidence that it is back in the correct
position.
STEP 4
Remove the RF output cables (D) and the reject cables from the
circulators. If necessary, mark them for proper installation later.
STEP 5
Remove the adjustable plate screws (C) and pull circulator assembly
straight back. This should provide access to the screws on the side of
either circulator. The heatsink screws pass all the way through the
heatsink and should only be removed if better access to the circulator
screws is required.
Figure 5-5 Circulator Assembly
A
B
C
C
C
C
D
A
B
D
A - Circulator
B - Circulator Heatsink
C - Adjustable plate screws
D - RF Output Cables
E - Heatsink screws
E
F - Mark plate here
F
F
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