Table of Contents
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8-1. INTRODUCTION
8-2.
This section contains theory of operation, a detailed troubleshooting procedure, and a schematic
diagram.
8-3. SCHEMATIC DIAGRAM SYMBOLS AND REFERENCE
DESIGNATORS
8-4.
Figure 8-1
shows the symbols used in the schematic diagram. At the bottom of
system for reference designators, assemblies, and subassemblies is shown.
8-5. REFERENCE DESIGNATORS
8-6. Theory of Operation
8-7.
The overall theory of operation for the 10811A/B starts with
operation starts with
8-8. OVERALL BLOCK DIAGRAM THEORY
8-9.
The 10811A/B Quartz Crystal Oscillator is an extremely stable, compact, low-power source of 10
MHz. The crystal, along with the oscillator, circuit buffer amplifier, and oven control circuits are all
mounted inside a thermally insulated housing.
8-10.
A detailed block diagram of the 10811A/B oscillator is shown in
8-11.
The 10811A/B oscillator is divided into three sections with each section connected by a .010-inch
thick flexible circuit. Three small circuit boards are bonded to the flexible circuit to provide support
in the areas where components are located. The arrangement allows the unit to be easily
disassembled and operated in the disassembled state on the service bench.
8-12.
The three sections can be divided into the following subsections
1. Main Oscillator
2. Automatic Gain Control
Voltage Reference (+5.7V and +6.4V)
Output Impedance Matching Buffer
3. Output Buffer Amplifier
Oven Controller
SECTION VIII
SERVICE
paragraph
8-13.
Model 10811A/B
Figure
paragraph
8-9. The detailed theory of
Figure 8-2.
(Figure
8-2):
8-1, the
39
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Table of Contents
Troubleshooting
