Wiltron 54 A Series User manual

SERIES 54XXA
SCALAR MEASUREMENT SYSTEMS
MAINTENANCE MANUAL
P/N: 10410-00123
REVISION: A
PRINTED: AUGUST 1992
COPYRIGHT 1992 WILTRON CO.
490 JARVIS DRIVE ● MORGAN HILL, CA 95037-2809

WARRANTY
The WILTRON product(s) listed on the title page is (are) warranted against defects in
materials and workmanship for one year from the date of shipment, except for YIG-tuned
oscillators, which are warranted for two years.
WILTRON’s obligation covers repairing or replacing products which prove to be defective
during the warranty period. Buyers shall prepay transportation charges for equipment
returned to WILTRON for warranty repairs. Obligation is limited to the original purchaser.
WILTRON is not liable for consequential damages.
LIMITATION OF WARRANTY
The foregoing warranty does not apply to WILTRON connectors that have failed due to
normal wear. Also, the warranty does not apply to defects resulting from improper or
inadequate maintenance by the Buyer, unauthorized modification or misuse, or operation
outside of the environmental specifications of the product. No other warranty is expressed
or implied, and the remedies provided herein are the Buyer’s sole and exclusive remedies.

MANUAL CHANGES
MANUAL:
Title: Series 54XXA Scalar Measurement Systems Maintenance Manual
Part Number: 10410-00123
Rev. Ltr/Date: A / November 1992
CHANGE PACKET
Part Number: 10900-00106
INSTRUCTIONS
1. Make the manual changes listed below. These changes are listed in numerical order by page number.
2. The replacement pages provided in this change package are for technical changes and errata to the
manual. The black bar or bars in the replacement page margins show the area in which the changes were
made.
CHANGE 1, February 1993:
1. Page 2-4:
Replace with enclosed pages 2-3 and 2-4, Changed: February 1993.
2. Pages 2-5 and 2-6:
Replace with enclosed fold-out pages 2-5 and 2-6, Changed: February 1993.
3. Pages 6-24 and 6-25:
Replace with enclosed pages 6-23 through 6-26, Changed: February 1993.
4. Pages A-5 and A-6:
Replace with enclosed appendix pages A-5 and A-6, Changed: February 1993.
54XXA OM C-1

TABLE OF CONTENTS
Chapter 1 — General Service Information
This section provides a general description of series 54XXA Scalar Measurement Systems, system
serial numbers, and frequency ranges. It explains the level of maintenance covered in this manual
and provides preventative maintenance procedures. It also contains static-sensitive component han-
dling precautions and a list of recommended test equipment.
Chapter 2 — Replaceable Parts
This Chapter lists all replaceable subassemblies and components for all 54XXA models. It explains
the WILTRON exchange assembly program and provides parts ordering information.
Chapter 3 — Troubleshooting
This chapter provides information for troubleshooting 54XXA Scalar Measurement Systems. The
troubleshooting information and fault location tables contained in this chapter support fault isola-
tion down to a replaceable subassembly.
Chapter 4 — Functional Overview
This chapter provides descriptions of the functional operation of the major assemblies contained in
54XXA series Scalar Measurement Systems. The operation of all major circuit blocks is described
so that the reader may better understand the function of each major assembly as part of the over-
all operation of the 54XXA.
Chapter 5 — Removal and Replacement Procedures
This chapter describes how to gain access to the major 54XXA assemblies and parts for trou-
bleshooting or replacement.
Chapter 6 — Adjustments
This chapter provides adjustment procedures for all models of series 54XXA Scalar Measurement
Systems. These procedures are used after replacement or repair of one or more critical subassem-
blies, or as indicated by the Performance Verification Procedures (which are contained in Section V
of the Series 54XXA Scalar Measurement Systems Operation Manual).
Appendix A — RF Detector Diode Replacement Procedures
This appendix contains rf detector diode replacement procedures for 5400-71XXX and 560-7XXX se-
ries RF Detectors.
54XXA MM i

Appendix B — Fabrication of RF Detector Simulator
This appendix contains information for fabricating the T1492 RF Detector Simulator test aid. This
test aid is used in the calibration procedures contained in Chapter 6.
Appendix C — Fabrication of Dummy Thermistor Test Aids
This appendix contains information for fabricating the T38300 Dummy Down Converter Thermis-
tor and the T38301 Dummy Directional Coupler Thermistor test aids. These test aids are used in
the Temperature Compensation Adjustment Procedure for series 54XXA Scalar Measurement Sys-
tems contained in Chapter 6.
Table of Contents (Continued)
ii 54XXA MM

Table of Contents
1-1 SCOPE OF THE MANUAL . . . . . . . . . . . . . . . . . . . 1-3
1-2 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-3 IDENTIFICATION NUMBER . . . . . . . . . . . . . . . . . . 1-3
1-4 DESCRIPTION OF 54XXA SYSTEM . . . . . . . . . . . . . . 1-3
1-5 LEVEL OF MAINTENANCE . . . . . . . . . . . . . . . . . . 1-4
Troubleshooting and Repair . . . . . . . . . . 1-4
Replaceable Subassemblies and Parts . . . . . 1-4
Adjustments . . . . . . . . . . . . . . . . . . . 1-4
Preventive Maintenance . . . . . . . . . . . . 1-5
1-6 RELATED MANUALS . . . . . . . . . . . . . . . . . . . . . . 1-5
1-7 PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . 1-5
1-8 STATIC SENSITIVE COMPONENT HANDLING
PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1-9 RECOMMENDED TEST EQUIPMENT . . . . . . . . . . . . 1-6
Chapter 1
General Service Information

Figure 1-1. Model 5417A Scalar Measurement System with Detector and SWR Autotester (and Test Device)

Chapter 1
General Service
Information
1-1 SCOPE OF THE MANUAL This manual provides general service and preventative maintenance in-
formation, replaceable parts information, circuit descriptions, trou-
bleshooting procedures, and adjustment procedures for WILTRON se-
ries 54XXA Scalar Measurement Systems (SMS’s). Throughout this
manual, these systems are referred to as “54XXA”.
1-2 INTRODUCTION This chapter of the manual provides a general description of series
54XXA Scalar Measurement Systems, system serial numbers, fre-
quency ranges, and related manuals. Also included is information
about the level of maintenance covered in this manual, preventative
maintenance procedures, and static-sensitive component handling pre-
cautions. A list of recommended test equipment is also provided.
1-3 IDENTIFICATION NUMBER All WILTRON instruments are assigned a six-digit ID number, such as
“101001.” This number appears on a decal affixed to the rear panel.
Please use this identification number during any correspondence with WIL-
TRON Customer Service about this instrument.
1-4 DESCRIPTION OF 54XXA
SYSTEM
Series 54XXA systems are microprocessor controlled scalar measure-
ment systems. These systems are used to make scalar (magnitude)
transmission, reflection, and absolute power measurements. Atypical
model is shown in Figure 1-1 (facing page). All measurement functions
are selectable by using the front panel keys and controls in conjunction
with the display screen menus. Refer to the 54XXA Scalar Measure-
ment Systems Operation Manual for information about operation of
these systems. Refer also to that manual for information about system op-
tions, SWR Autotesters, detectors, and other accessories used with series
54XXASystems.
54XXA MM 1-3

The measurement frequency range of the 54XXA is determined by:
The range of the internal signal source of the particular model.
The external SWR Autotester and/or detector used with the
54XXA.
The table at left lists the frequency ranges of all 54XXA models. For in-
formation about the frequency ranges and characteristics of WILTRON
SWR Autotesters and RF detectors normally used with series 54XXA
models, refer to the 54XXA Scalar Measurement Systems Operation
Manual.
Option 3 to the 54XXA provides remote operation using the IEEE–488
General Purpose Interface Bus (GPIB). This option allows all 54XXA
front panel control functions (except POWER on/off) to be controlled re-
motely from an external computer/controller using GPIB commands.
Refer to the 54XXA Scalar Measurement Systems Operation Manual
for information about other options and accessories available for
54XXA models.
1-5 LEVEL OF MAINTENANCE Maintenance and troubleshooting of the 54XXA consists of:
Troubleshooting the 54XXA to a replaceable subassembly
Repair by replacing the failed subassembly
Adjustments
Preventive maintenance
Troubleshoot-
ing and Re-
pair
Most faults involving the 54XXA are field repairable
by replacing the subassembly that is at fault. The
procedures contained in this manual provide trou-
bleshooting to this level. Refer to Chapter 3, Trou-
bleshooting.
This manual also contains procedures for replacing
defective detector diodes for Series 560-7XXX RF De-
tectors and for 5400-71B75 RF Detectors. These pro-
cedures are contained in Appendix A.
Replaceable
Subassemblies
and Parts
Chapter 2 provides replaceable parts information for
all 54XXA models. It lists all field-replaceable subas-
semblies and parts. It also identifies all subasem-
blies that are presently covered by the WILTRON
exchange assembly program.
Adjustments Procedures for adjustment of the 54XXA after repair
or replacement of one or more subassemblies is de-
scribed in Chapter 6, Adjustments.
Model Frequency Range (GHz)
5407A 0.001 to 1.0
5409A 0.001 to 2.0
5411A 0.001 to 3.0
5417A 0.01 to 8.6
5419A 2.0 to 8.6
5428A 8.0 to 12.4
5431A 10.0 to 16.0
5430A 12.4 to 20.0
5436A 17.0 to 26.5
5437A 2.0 to 20.0
5447A 0.01 to 20.0
Table 1-1. 54XXA Model Frequency
Ranges
DESCRIPTION OF 54XXA GENERAL
SYSTEM SERVICE INFORMATION
1-4 54XXA MM

Preventive
Maintenance Fan filter replacement, described in paragraph 1-7.
1-6 RELATED MANUALS The 54XXA Scalar Measurement Systems Operation Manual (10410-
00118) describes the front panel operation for all 54XXA models. It also
contains general information, specifications, and Performance Verifica-
tion procedures for all models.
Operation of the 54XXA remotely via the IEEE-488 General Purpose
Interface Bus (GPIB) is described in the 54XXA Series Scalar Measure-
ment Systems GPIB User’s Guide (10410-00119). This user’s guide is
located at the rear of the 54XXA Scalar Measurement Systems Opera-
tion Manual.
1-7 PREVENTIVE
MAINTENANCE
The 54XXA must always receive adequate ventilation. Check and clean
the rear panel fan filter periodically. Clean this filter more frequently
in dusty environments. Proceed as follows:
Step 1 Remove the four capnuts holding the filter in place (Fig-
ure 1-2).
Step 2 Remove the filter.
Step 3 Clean the filter by flushing with compressed air.
Step 4 Replace the filter by reversing the previous steps.
Step 5 Ensure that the cap nuts are securely tightened.
GENERAL SERVICE LEVEL OF
INFORMATION MAINTENANCE
CAP NUTS (4)
FAN FILTER
FILTER GUARD
Figure 1-2. Fan Filter Removal/Replacement
54XXA MM 1-5