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 9-15
• Remove test equipment.
• Restore the station to normal service.
• Return to the trouble shooting flow chart to resume
the troubleshooting sequence.
Verifying Receiver
Circuitry
Introduction
While most module faults can be detected by running the station
diagnostics provided by the RSS, the following procedure provides
a more traditional method of troubleshooting the receiver circuitry.
This procedure is useful in the event that the RSS is not at hand, or,
for some reason, cannot be utilized (PC malfunction, etc.)
This procedure allows the service technician to make minor
adjustments and verify the proper operation of the station receive
circuitry, including:
• Receiver Module
• Power Supply Module
• 2.1 MHz Reference Oscillator Circuitry
• Receiver-related circuitry in the Station Control
Module (SCM)
In general, the receiver circuitry is exercised by injecting and
measuring signals using a Motorola R2001 Communications
Analyzer (or equivalent). Measured values outside the acceptable
range indicate a faulty module; values within range verify proper
operation of the above listed modules and circuitry.
Required Test Equipment The following test equipment is required to perform the procedure:
• Motorola R2001 Communications Analyzer (or
equivalent)
• Telephone-style handset with PTT switch
(TMN6164, or equivalent)
• RJ-11 to BNC cable
• Dummy Load (50Ω, station wattage, or higher)
IMPOR
TANT! If the station operates as a repeater, the transmit output from
the station must be connected to a dummy load to prevent over-
the-air broadcast during receiver testing.