Model 204B
TABLE
OF
CONTENTS
Table of Contents
List of Illustrations
List of Tables
Section Page
I GENERAL INFORMATION
........
1-1
1-1
.
Introduction
...........
1-1
1-4
.
Power Supply
..........
1-1
1-8
.
Accessories Available
......
1-1
1-10.
Instrument Identification
.....
1-1
1-6
.
Mercury and Rechargeable Batteries
1-1
I1
INSTALLATION
............
2-1
2-1
.
Inspection
............
2-1
2-4
.
Rack / Bench Instructions
.....
2-1
2-6
.
Combining Case
........
2-1
2-8
.
Adapter Frame
........
2-1
2-12
.
AC-Powered Oscillators
.....
2-1
2-16
.
Repackaging for Shipment
.....
2-2
2-10
.
Battery-Powered Oscillators
...
2-1
111
OPERATION
..............
3-1
3-1
.
Introduction
...........
3-1
3-3
.
Procedure
............
3-1
3-5
.
General Operating Considerations
.
3-1
3-10
.
Operation With Rechargeable
Batteries
...........
3-1
3 -16
.
Recharging Nickel-Cadmium
Batteries
..........
3-2
3-20
.
Cycle-Life of Nickel-Cadmium
Batteries
..........
3-2
3-26
.
Mercury Battery Replacement
...
3-2
IV PRINCIPLES
OF
OPERATION
......
4-1
4-1
.
Introduction
...........
4-1
4-7
.
Oscillator Circuit
........
4-1
4-13
.
Peak Detector
..........
4-2
V
MAINTENANCE
............
5-1
5-1
.
Introduction
...........
5-1
5-3
.
Required Test Equipment
.....
5-1
I
Section V (Cont'd) Page
5.5
.
Performance Checks
.......
5-1
5.7
.
Dial Accuracy Check
.....
5-1
Output Voltage Check
.....
5-2
5-9
.
Distortion Check
.......
5-2
5-10
.
Repair
.............
5-3
5-12
.
Cover Removal
........
5-3
5-14
.
Servicing Etched Circuit Boards
.
5-3
5 -16
.
Troubleshooting
.........
5-4
5-18
.
Adjustment and Calibration
....
5-4
5-19
.
AC Power Supply Checks
....
5-4
5-23
.
Battery Charger Current
5-4
5-26
.
DC Bal
.
Adjustment
......
5-5
5-28
.
Distortion Check
........
5-5
5-29
.
Frequency Calibration
5-31
.
Replacement Procedures
.....
5-6
5-32
.
Cam Cable Replacement
....
5-6
5-34
.
Frequency Potentiometer
5-36
.
Range Switch Assembly
5-38
.
Battery-Pack Power Supply
....
5-8
5-40
.
AC
Power Supply
.........
5-8
5-42 Rechargeable Battery Power
5-45
.
Replacement of Rechargeable
5-8. Frequency Response and
Adjustment
..........
Adjustments
.........
5-5
Replacement
.........
5-6
Replacement
.........
5-7
Supply
..............
5-8
Batteries
...........
5-8
VI
REPLACEABLEPARTS
........
6-1
6-1 Introduction
..........
6-1
6-2
.
Ordering Information
......
6-1
LIST
OF
ILLUSTRATIONS
Number Page
1.1
.
Model 204B Oscillator
..........
1-0
2.2
.
Combining Case
............
2-0
2.3
.
Adapter Frame Instrument Combinations 2-1
3.1
.
Front Panel Controls, Connectors
3.2
.
Rear View of Model 204B Showing
Mercury Batteries Installed
......
3-2
4.1
.
Block Diagram
..............
4-1
4.2
.
Simplified Schematic Diagram
......
4-2
4.3
.
RC Network Characteristics
.......
4-2
5.1
.
Distortion Checks
...........
5-1
5.2
.
and Output Voltage Check
.......
5-2
2.1
.
Combining Case
.............
2-0
Steps to Place Instrument into
2.4
.
TwoSubmodule Units inRack Adapter
...
2-2
and Operating Instructions
......
3-0
Test Setup for Dial Accuracy or
Test Setup for Frequency Response
Number Page
5.3
.
Cover Removal
..............
5-3
5.4
.
Model 204B. Exploded View
.......
5-4
5.5
.
Cams and Cable Relationship
.......
5-6
5.6
.
Range SwitchDetail
............
5-7
Model 204B
...............
5-8
5.8
.
AC Power Supply Installation
.......
5-9
Battery Power Supply
..........
5-10
Pack Power Supply
...........
5-11
Rechargeable Batteries
.........
5-12
5.7
.
Rear View of Battery-Powered
5.9
.
Rear Internal View of Rechargeable
5.10
.
Oscillator and Amplifier with Battery
5.11
.
Option 02 Power Supply with
5.12
.
Option
01
AC Power Supply
........
5-13
LIST
OF
TABLES
1
Number
Page Number Page
1.1.
Specifications
............
1-1
5.3
.
Troubleshooting Summary
......
5-5
5.1
.
Required Test Equipment
.......
5-1
6-1
.
Index by Reference Designator
....
6-2
5.2
.
Dial Accuracy
............
5-2 6.2
.
Replaceable
Parts
..........
6-5
01369-3
V
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