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 9-11
Verifying Transmitter
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 transmitter
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 transmit
circuitry, including:
• Exciter Module
• Power Amplifier Module
• Power Supply Module
• 2.1 MHz Reference Oscillator Circuitry
• Transmitter-related circuitry on the Station
Control Module (SCM)
In general, the transmitter 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)
• In-line Wattmeter (Motorola Model S-1350, or
equivalent)
• Dummy Load (50Ω, station wattage or higher)
Verifying Transmitter
Circuitry Procedure
Step 1. Connect test equipment by performing Step 1 through
3 shown in Figure 6.
Step 2. Connect handset to RJ-11 connector on SCM front
panel, as shown. The cover plate over the SCM side of
the chassis must be removed to access this connector.
MEPF-27031-O
Handset
PTT
Button