User's Manual
Table Of Contents
- Front Cover
- Contents
- 1 - Foreword 11
- 2 - Safety and General Information 21
- 3 - Introduction 31
- 4 - System Applications 41
- 5 - Models and Specifications 51
- 6 - Approved Accessories 61
- 7 - Setup and Connections 71
- 8 - Operation 81
- 9 - Troubleshooting 91
- Introduction 91
- Recommended Test Equipment 91
- Troubleshooting Procedures 91
- Module Replacement Procedures 925
- General Replacement Information 925
- Anti-Static Precaution 925
- Care of Gold-Plated Connector Contacts 926
- Power Down Station Before Removing/Inserting Modules 926
- Validating Repairs 926
- Module Replacement 926
- Wireline 928
- ASTRO Modem Card/V.24 Interface Card 929
- Receiver 929
- Exciter 931
- Power Amplifier 932
- Power Supply 933
- Backplane 934
- Preselector Field Tuning Procedure 935
- 10 - Functional Theory of Operation 101
- 11 - Block Diagram, Schematics, Electrical Parts List, and Circuit Board Detail 111
- List of Tables
- List of Figures
- Parts Lists
- Foreword
- Safety and General Information
- Introduction
- System Applications
- Models and Specifications
- Approved Accessories
- Setup and Connections
- Operation
- Troubleshooting
- Introduction
- Recommended Test Equipment
- Troubleshooting Procedures
- Module Replacement Procedures
- Preselector Field Tuning Procedure
- Functional Theory of Operation
- Schematics
- Back Cover
9-30 December 1, 2000 68P81093C75-O
3. Remove the cover plate on the left end of the front of the station
by removing two Torx screws from the front of the plate.
Remove the four Phillips screws from the side and bottom
edges of the plate. Remove two more Phillips screws from the
bottom of the chassis under the preselector.
4. A coaxial cable runs from the receiver’s preselector, through the
center wall of the chassis, and to the top panel UHF connector.
Disconnect the cable from the preselector and push the loose end
of the cable through the center wall so that it is completely clear
of the receiver.
5. Pull the old receiver out by gripping the tabs protruding past
each end of the preselector.
6. Insert the new module. Make sure it fits under the metal rails
inside the chassis. Push it firmly into the chassis until it seats
into the card-edge connectors on the backplane. (Do not slam
the board against the backplane or push any harder than
necessary to seat the connectors.)
7. 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.
8. 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.
9. Feed the coaxial cable detached in Step 3 back through the
opening in the center wall of the chassis and reconnect it to the
mini-UHF connector on the preselector.
10. 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.