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 9-23
• VHF: 0.29 µV (-117.7 dBm)
• UHF: 0.43 µV (-114.4 dBm)
NOTE: For VHF and UHF stations only, refer to
5. Preselector Field Tuning Procedure in this
section, for procedures to tune the receiver
preselector.
Step 4. Note the receiver BER reading. The BER reading
should be 5% or less. If not, and if a duplexer is being
used, repeat the BER test, bypassing the duplexer. If
the BER is 5% or less after bypassing the duplexer, the
station frequencies do not match the duplexer
frequencies, or the duplexer-to-top panel cables are
faulty.
If the BER, as tested straight into the top panel, is
greater than 5%, tune the preselector and re-check the
BER reading. If a reading of 5%, or less, cannot be
achieved, replace the Receiver Module.
Step 5. This completes the Verifying Receiver Circuitry test
procedure. If all displays and measurements are
correct, the receiver circuitry may be considered to be
operating properly.
1. Remove test equipment.
2. Restore the station to normal service.
3. Return to the trouble shooting flow chart to resume
the troubleshooting sequence.
Wiring Diagram Please refer to Figure 10 for a conceptual line drawing of the
motherboard, modules, and other components set flat outside of the
chassis and properly interconnected.
Please refer to Figure 11 on page 25 for a detailed diagram of the
connections from the AC inlet connector to the power supply and
chassis ground.