IFR FM/AM-500A Manuals

Manuals and User Guides for IFR FM/AM-500A. We have 1 IFR FM/AM-500A manual available for free PDF download: Maintenance Manual

IFR FM/AM-500A Maintenance Manual (320 pages)

COMMUNICATIONS SERVICE MONITORS

Brand: IFR | Category: Measuring Instruments | Size: 17.74 MB

Preface
7
Table of Contents
9
General
24
Section 1 - Introduction
24
FM/AM-SOOA Electrical Description
24
Frequency Selectors
24
Meters
24
Mode/Bandwidth Control
24
RF Output Level Control
25
FM/AM-SOOA Power Requirements
25
Frequency Standards
25
Reference Designators
25
Corrective Maintenance Procedures
26
Section 2 - Theory of Operation
29
Introduction
29
Simplified Theory of Operation
29
Intermodule Systems Theory of Operation
29
Block Modules
30
Simplified Theory of Operation
30
Operation as a Receiver
30
Intermodule Systems Theory of Operations
33
Reference Frequencies
33
Frequency Conversion Modules
33
Reference Frequencies Block Diagram
33
Audio System
34
Frequency Conversion Modules Block Diagram
35
Frequency Error Display
36
Audio System Block Diagram
37
Frequency Error Indicator Block Diagram
38
Phase Lock Indicator Circuit
39
Phase Lock Indicator Circuit Block Diagram
39
Section 3 - Performance Evaluation
40
General
40
Test Equipment Requirements
41
Mobile Performance Evaluation Procedures
42
Khz Tone Generator
43
Variable Tone Generator
44
Receiver
45
RF Frequency Error Meter
47
Audio Frequency Error Meter
49
Generate Mode and Modulation Meter
51
Modulation Meter
51
Ssb
53
Variable Tone Generator Lab Test Set-Up
56
Receiver Lab Test Set-Up
58
Frequency Error Meter Lab Test Set-Up
66
Modulation Meter Lab Test Set-Up
68
SINAD Meter
71
Power Meter 4 -2
75
Generate Output Level
75
General
75
Calibration Points
77
How to Use Tabular Flowcharts
100
Troubleshooting Hints
100
Safety Precautions
101
Test Equipment Requirements
101
Disassembly/Reassembly Requirements
102
Index of Troubleshooting Flowcharts
102
Troubleshooting Power Supply
103
Incorrect Output Voltages
103
Incorrect Battery Charging Rate
106
Troubleshooting Receiver
108
Sensitivity Low at Certain Frequencies
108
Sensitivity Low at All Frequencies
109
Improper Demodulation
111
Troubleshooting Generator
114
Incorrect Carrier Amplitude
114
Incorrect Carrier Frequency
121
Inadequate Response to Variable Generator Control
124
Tr O U B 1 es Ho O T I N G Phase lo C K S· y Stem
126
Lock Light Indicates System Is Not Phase Locked
126
High Loop Does Not Phase Lock
130
Low Loop Does Not Phase Lock
134
Section 8 - Disassembly/Reassembly Procedures
137
6- I Disassembly/Reassembly Procedures
137
Genera 1
137
Preliminary Considerations
137
Index of Module Disassembly and Reassembly Procedures
138
Case
138
Battery
138
Oven Oscillator
138
Frequency Standard PC Boa Rd
141
Power Supply PC Board
141
1120 Mhz Low Pass Filter
142
Speaker
142
Motherboard
142
Audio PC Boards
143
Enclosed Module Assemblies
144
Enclosed Modules
145
IF Module Assembly
150
IF Module
151
Dual VCO
153
Rear Panel
154
Attenuator Control Alignment
164
Power Supply Block Diagram
171
Reassembly
174
Preparation for Testing
177
Testing
178
Dual VCO Block Diagram
180
Dual VCO Test Connections
183
High Loop Synthesizer Block Diagram
187
Low Loop Synthesizer Test Set-Up
198
Receiver/Generator Block Diagram
201
Frequency Standard Block Diagram
207
Digital Module Input Signals
215
Audio 300
217
Reassembly
218
Receive Audio Module Block Diagram
221
Generate Audio Module Block Diagram
230
Output Amplifier Module Block Diagram
237
Generate Amplifier Block Diagram
247
Section 8 - Preventive Maintenance
249
External Cleaning
249
Internal Cleaning
249
Visual Inspection
249
Section 9 - Pc Board Assemblies
251
General
251
Modulation Meter Switch PC Board (FM/AM-500A)
251
RF Thumbwheel Switch PC Board
252
Variable Tone Thumbwheel Switch PC Board
252
Power Supply PC Board
252
(SN 1001 Thru 3224)
273

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IFR FM/AM-500A Maintenance Manual (320 pages)

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