User's Manual

9-30 68P81093C75-A
8. Reinsert the receiver mounting plate and reattach the receiver
coaxial cable by reversing Steps 4 and 5.
9. If desired, power up the station while it is still out of the case to
make sure the module is securely in place.
If any of the LEDs do not light, are dim, or flash rapidly, one or
more of the modules are not seated properly.
10. For VHF and UHF stations, tune the preselector using the
procedure in the Maintenance subsection, Preselector Field
Tuning Procedure. Before continuing to the next step, be sure
to unplug the station.
11. Reassemble the station by reversing Steps 2 and 3.
After Installing the New
Receiver Module
Perform the following alignment procedures as described in the RSS
User’s Guide (part number 68P81085E35), or in the RSS section of
this manual, or in both:
• Squelch Adjust
• RSSI Calibrate
Preselector tuning is required for proper performance of the
Receiver Module and it should have been performed when installing
the module, as described under “Physical Replacement of the
Receiver Module.” If the tuning was not performed when the module
was installed, perform it now.
Exciter
Frequency Band
Considerations
When replacing the Exciter Module, it is important to remember the
frequency-sensitive nature of the Exciter/Power Amplifier
combination. The Exciter and the PA must match according to the
model breakdown table in this manual. If an Exciter with a new
frequency band is being installed, the corresponding PA must be
installed, as described in the Power Amplifier subsection of “Module
Replacement.”
Physical Replacement of
the Exciter Module
1. Turn off the station’s power by unplugging the AC and DC
power cords from the top panel.
2. Remove the eight Phillips screws from the edges of the station’s
top panel and lift the chassis out of the case.
3. Disconnect the coaxial cable running to a mini-UHF connector
at the front of the Exciter. For 800 MHz stations, also unplug
the SMB connector at the left end of the IPA (output to the PA)
and the 3-pin connector at the rear of the IPA module. If there is
not enough room to disconnect this cable, it may alternatively
be disconnected in the next step when the Exciter mounting
plate has been partially extracted from the chassis.