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
68P81093C75-O November 30, 2000 9-35
9. Lay the new backplane behind the station, and attach all the
wires as shown in Figure 10: Interconnect Diagram.
10. Hold the backplane in position behind the chassis. Ensure the
wires from the backplane do not bind against the Power Supply.
Slide the top of the board toward the chassis top panel, making
sure the two RJ-45 connectors fit into their cutouts.
11. Hold the Receiver Module from the front of the chassis, and
press the bottom center of the backplane into place against the
chassis. Snap the 80-pin connectors onto the Receiver and
Exciter.
12. While holding the top right portion of the backplane against the
chassis, press the Control Module, and then the Wireline
Module, into the chassis from the front, until they snap into the
backplane.
13. Using the six Phillips screws with lock washers, secure the
backplane to the chassis.
14. Finish reassembling the station by reversing Steps 2 and 3.
After Installing the New
Power Amplifier
Perform the following alignment procedures as described in the RSS
User’s Guide (68P81085E35), or the Setup and Connections
section of this manual, or both:
• Power Output
Using the RSS, run a complete battery of diagnostics to exercise all
boards and modules.
Preselector Field
Tuning Procedure
The VHF and UHF Receiver Modules comprise a circuit board and
a preselector assembly. Both are secured in a slide-in module
housing.
The preselector assembly is a 3-pole (UHF) or a 5-pole (VHF)
bandpass filter, equipped with tuning slugs to adjust the passband
corresponding to the operating frequencies of the station. The
preselector assembly must be field-tuned if replaced in the field, or
if the station operating frequency (or frequencies) is (are) modified.
The tuning procedure follows.
IMPOR
TANT! Tuning for best SINAD response DOES NOT result in optimum
tuning of the preselector assembly. You must use this field-
tuning procedure to obtain optimum preselector performance.