HP 8970B - Service Manual

HP 8970B Option 020
Service Manual
Supplement

Summary

Block Diagram and Parts List

Block Diagram

Schematic representation of the HP 8970B Option 020 front end, showing key components and signal flow.

Front End Overview

Detailed schematic of the HP 8970B front end, illustrating component connections and signal paths.

Material List

List of parts and their respective part numbers for the HP 8970B Option 020, including differences.

Theory of Operation

General Operation Principles

Explains the input range, signal filtering, mixing, and oscillator functions of the HP 8970B Option 020.

Adjustments

General Adjustment Overview

Outlines the two primary adjustments required for the HP 8970B Option 020.

Input Power Detector Calibration

Procedure for adjusting the gain and offset of the input power detector.

600 MHz SAW Oscillator Frequency Tuning

Steps to adjust the frequency of the 600 MHz SAW Oscillator for optimal performance.

Board Differences

General Board Differences

Highlights key differences in boards between the standard HP 8970B and the Option 20 model.

Microprocessor Board Firmware

Details firmware part numbers for the microprocessor board, distinguishing between standard and Option 20.

20 MHz IF Assembly Modifications

Lists component changes for the 20 MHz IF Assembly (08970-60050) compared to the standard version.

Driver Assembly Modifications

Details component and wiring changes implemented in the Driver Assembly (08970-60089).

Fault-Finding Tips

General Fault Finding Approach

Recommends using a signal generator and spectrum analyzer for effective troubleshooting.

2050 MHz Low Pass Filter Troubleshooting

Provides specifications and testing methods for the 2050 MHz LPF (0955-0634).

Input Assembly Troubleshooting

Discusses common issues, repair philosophy, and testing procedures for the Input Assembly.

YIG Tuned Oscillator Diagnostics

Details testing procedures and specifications for the YIG Tuned Oscillator (0955-0630).

Mixer Performance Verification

Explains mixer configuration, LO port requirements, and conversion loss testing.

Isolator (0960-0638) Testing

Covers insertion loss and measurement methods for the Isolator (0960-0638).

4.5 GHz Low Pass Filter Specs

Lists specifications and verification methods for the 4.5 GHz LPF (9135-0169).

Second Convertor (5086-7909) Analysis

Describes the function, connections, and conversion loss of the Second Convertor.

600 MHz SAW Oscillator Check

Outlines how the 600 MHz SAW Oscillator supplies the second convertor and its adjustment.

Board Details

600 MHz SAW Oscillator Component Layout

Component layout diagram for the 600 MHz SAW Oscillator assembly.

600 MHz Schematic Diagram

Schematic diagram for the 600 MHz SAW Oscillator assembly.

Input Section Layout (Assembly 08970-60097)

Component layout for the Input Section assembly (08970-60097).

Input Section Schematic (Assembly 08970-60097)

Schematic diagram for the Input Section assembly (08970-60097).

Input Section Layout (Assembly 08970-60125)

Component layout for the Input Section assembly (08970-60125).

Input Section Schematic (Assembly 08970-60125)

Schematic diagram for the Input Section assembly (08970-60125).

HP 8970 B Option 20 Hardware Diagram

Visual representation of the hardware layout for the HP 8970B Option 20.

HP 8970B Specifications