Tektronix FiberMaster TFP2A User manual

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Service Manual
TFP2A FiberMaster
Optical Time-Domain Reflectometer
070–9188–03
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to the Safety Summary prior to
performing service.
First Printing: April 1997

Copyright 1997 Tektronix, Inc. All rights reserved. Contents of this publication may not be
reproduced in any form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/
or pending patents.
TEKTRONIX, TEK, and FiberMaster are registered trademarks of Tektronix, Inc.
Printed in U.S.A. Specification and price change privileges are reserved.

WARNING
This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and
used in accordance with the instructions manual, may cause interference to radio communica-
tions. It has been tested and found to comply with the limits for a Class A computing device pur-
suant to Subpart J of Part 15 of FCC Rules, which are designated to provide reasonable
protection against such interference when operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause interference, in which case, the user, at his
or her own expense, will be required to take whatever measures may be required to correct the
interference.
EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
TFP2A FiberMaster
meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was demon-
strated to the following specifications as listed in the official Journal of the European Communities:
EN 50081-1 Emissions
EN 55022 Radiated, Class B
IEC 1000-3-2 Mains Current Harmonics
EN 50082-1 Immunity:
IEC 1000-4-2 Electrostatic Discharge
IEC 1000-4-3 RF Radiated
IEC 1000-4-4 Fast Transients
IEC 1000-4-5 Surge
IEC 1000-4-11 Dropout

Introduction
Contacting Tektronix
Phone [phone]*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Servicesupport 1-800-833-9200, select option 2*
Technical support Email: [email protected]
1-800-833-9200, select option 3*
1-503-627-2400
6:00 a.m. – 5:00 p.m. Pacific time
*This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.

TFP2A FiberMaster Module-Level Service Manual v
TFP2A FiberMaster
Module-Level Service Manual
Table of Contents
Safety Information ............................................................................. xi
1 Introduction: the FiberMaster OTDR......................................1-1
Product Description......................................................................................1-1
Using this Manual..........................................................................................1-4
Strategy for Servicing................................................................................1-4
Manual Structure.......................................................................................1-5
Manual Conventions.................................................................................1-5
Warranty Information....................................................................................1-6
Tektronix Service...........................................................................................1-7
Specifications................................................................................................1-8
Electrical Characteristics...........................................................................1-8
Operational Characteristics.....................................................................1-11
Physical Characteristics..........................................................................1-11
Environmental Characteristics ................................................................1-12
FS1300 Singlemode Optical Module ......................................................1-14
FS1500 Singlemode Optical Module ......................................................1-15
FS1315 Singlemode Optical Module ......................................................1-16
FG1300 Singlemode Optical Module......................................................1-17
FG1315 Singlemode Optical Module......................................................1-18
FL1300 Singlemode Optical Module.......................................................1-19
FL1500 Singlemode Optical Module.......................................................1-20
FL1315 Singlemode Optical Module.......................................................1-21
FM8500 Multimode Optical Module ........................................................1-22
FM1300 Multimode Optical Module ........................................................1-23
FM8513 Multimode Optical Module ........................................................1-24
Accessories and Options ...........................................................................1-25
Mainframes.............................................................................................1-25
Accessories.............................................................................................1-25
Options....................................................................................................1-26
Unpacking and Preparation for Use ..........................................................1-29
Preparation for Use.................................................................................1-29
Storage ...................................................................................................1-35
Repacking for Shipment..........................................................................1-35
Recalibration................................................................................................1-36
2 General Operating Instructions.............................................. 2-1
Overview of FiberMaster Operation.............................................................2-2
The Acquisition Screen.............................................................................2-4
Basic Operating Procedures........................................................................2-8

Table of Contents
vi TFP2A FiberMaster Module-Level Service Manual
3 Theory of Operation ................................................................3-1
A1 - Control....................................................................................................3-1
Host Processor .........................................................................................3-1
Display Processor.....................................................................................3-1
Timebase..................................................................................................3-2
Signal Averager ........................................................................................3-2
A2 - Front Panel.............................................................................................3-3
Front Panel ...............................................................................................3-3
A3 - Power Supply.........................................................................................3-3
A4 - Interconnect...........................................................................................3-3
Interconnect..............................................................................................3-3
A5 - Module Support .....................................................................................3-4
Digital Interface and Cooler Power Supplies ............................................3-4
Mask Generator........................................................................................3-4
Strobe Continuation..................................................................................3-4
A6 - Printer Assembly...................................................................................3-5
Printer-Power Distribution.........................................................................3-5
A7 - Display Assembly..................................................................................3-5
Display......................................................................................................3-5
A20/A30 - Optical Plug-in..............................................................................3-5
4 Maintenance.............................................................................4-1
Product Service.........................................................................................4-1
Static-Sensitive Components....................................................................4-2
Inspection and Cleaning Procedures..........................................................4-3
Exterior Inspection....................................................................................4-3
Exterior Cleaning ......................................................................................4-4
Optical-Fiber Cleaning..............................................................................4-4
Interior Inspection .....................................................................................4-6
Interior Cleaning........................................................................................4-7
Lubrication ................................................................................................4-7
Terminal Interface..........................................................................................4-8
Functional Tests..........................................................................................4-10
Mainframe Checks..................................................................................4-10
Performance Verification............................................................................4-16
Equipment Required...............................................................................4-16
Clock Frequency.....................................................................................4-16
Verify Clock Phase..................................................................................4-17
Front-Panel Loss.....................................................................................4-18
Dynamic Range ......................................................................................4-20
Dead Zone (Attenuation).........................................................................4-32
Dead Zone (Event)..................................................................................4-34
Displayed Noise <0.030 dB (FS/FG series only) ....................................4-36
Zero Distance Accuracy..........................................................................4-38
Vertical System Linearity ........................................................................4-40
Optical Output Amplitude........................................................................4-56

Table of Contents
TFP2A FiberMaster Module-Level Service Manual vii
Adjustments.................................................................................................4-60
Control Board Adjustments.....................................................................4-60
Printer Board Adjustment........................................................................4-62
Display Adjustments ...............................................................................4-64
Troubleshooting and Diagnostics .............................................................4-70
Using the Diagnostics Menus .................................................................4-70
Troubleshooting Flowchart......................................................................4-71
Removal and Replacement Procedures....................................................4-75
Covers and Front Panel..........................................................................4-77
Back-Panel Assembly and Plug-In Optical Modules...............................4-79
Control Board..........................................................................................4-80
Printer Tray and Printer...........................................................................4-82
CRT, Color Shutter/Monochrome Filter, and Display Board...................4-83
PSI Power Supply (AC only)...................................................................4-87
IPD Power Supply and DC Power Option...............................................4-89
MDI Power Supply and DC Power Option ..............................................4-95
Disk Drive................................................................................................4-98
Module Support Board............................................................................4-99
Interconnect Board................................................................................4-100
Fan........................................................................................................4-101
Power Switch, Wire Set, and Line Filter................................................4-103
5 Replaceable Parts List ............................................................5-1
Parts Ordering Information...........................................................................5-1
Module Replacement................................................................................5-1
Using the Replaceable Parts List.................................................................5-2
Tektronix Part Number..............................................................................5-2
Serial/Model No. .......................................................................................5-2
Name and Description ..............................................................................5-2
Mfr. Code and Part Number......................................................................5-2
A Performance Verification Data Sheets...................................A-1
Optical Test Summary Data Sheet—FS1315 Singlemode ......................A-2
Optical Test Summary Data Sheet—FG1315 Singlemode......................A-3
Optical Test Summary Data Sheet—FL1315 Singlemode.......................A-4
Optical Test Summary Data Sheet—FM8513 Multimode........................A-5
B GPIB and RS-232 Connections...............................................B-1
C Firmware Features...................................................................C-1
D Error Codes..............................................................................D-1

viii TFP2A FiberMaster Module-Level Service Manual
List of Illustrations
Figure 1-1. Connector Options ..........................................................................1-28
Figure 1-2. Installing Optical Modules ..............................................................1-30
Figure 1-3. Interconnect Circuit Board Connectors.........................................1-31
Figure 1-4. Installing the Module Spacer: Two-Module Configuration...........1-32
Figure 1-5. Front-Panel Option Covers .............................................................1-33
Figure 1-6. Loading Paper into the Internal Printer .........................................1-34
Figure 2-1. Features on the Acquisition Screen.................................................2-4
Figure 2-2. Acquisition Screen Expansion—Overview (top),
and Expanded View (bottom)....................................................2-5
Figure 2-3. Front Panel Overview ........................................................................2-8
Figure 2-4. Back Panel..........................................................................................2-9
Figure 4-1. Cleaning and Changing the Universal Connector ..........................4-5
Figure 4-2. Terminal Interface Connector...........................................................4-9
Figure 4-3. The Start-Up Screen ........................................................................4-10
Figure 4-4. Front-Panel Loss..............................................................................4-17
Figure 4-5. Dynamic Range Measurements......................................................4-19
Figure 4-6. Measuring the Backscatter .............................................................4-27
Figure 4-7. Noise Acquisition.............................................................................4-28
Figure 4-8. Measuring the Noise Floor..............................................................4-30
Figure 4-9. Dead Zone (Attenuation) Measurement.........................................4-31
Figure 4-10. Dead Zone (Event) Measurement .................................................4-33
Figure 4-11. Loss Cursors Measuring Noise....................................................4-36
Figure 4-12. Zero Distance Measurement.........................................................4-38
Figure 4-13. Two Acquisitions with Loss Variations .......................................4-40
Figure 4-14. Waveforms Superimposed: Variation in Fiber............................4-41
Figure 4-15. Waveforms Superimposed: Variation in Vertical System..........4-42
Figure 4-16. Variation Superimposed on Linear Backscatter.........................4-43
Figure 4-17. Two-Point Cursors Parallel to Waveforms ..................................4-44
Figure 4-18. Measuring Positive Non-Linearity................................................4-45
Figure 4-19. Measuring Negative Non-Linearity...............................................4-46
Figure 4-20. Test Set-Up with Optical Attenuator ............................................4-47
Figure 4-21. Backscatter on Reference Waveform ..........................................4-48
Figure 4-22. Test Set-Up with Optical Attenuator ............................................4-51
Figure 4-23. VCO Tune Voltage Adjustment.....................................................4-60
Figure 4-24. Printer Board Adjustment .............................................................4-61
Figure 4-25. Display Board Voltage Adjustment..............................................4-64
Figure 4-26. CRT Ring Magnet and Yoke Adjustments ...................................4-66
Figure 4-27. Display Board Video Adjustments ...............................................4-68
Figure 4-28. Run Diagnostics Menu ..................................................................4-69
Figure 4-29. Set Options Menu ..........................................................................4-70
Figure 4-30. Connector Orientation...................................................................4-75
Figure 4-31. Removing Instrument Covers.......................................................4-76

List of Illustrations
TFP2A FiberMaster Module-Level Service Manual ix
Figure 4-32. Removing Front-Panel Assembly.................................................4-77
Figure 4-33. Removing the Back-Panel Assembly and Plug-In
Optical Module(s).....................................................................4-78
Figure 4-34. Removing the Control Board........................................................4-80
Figure 4-35. Removing the Printer Assembly...................................................4-81
Figure 4-36. Removing the Color Shutter .........................................................4-82
Figure 4-37. Removing the Monochrome Filter................................................4-83
Figure 4-38. Detaching the Display Board........................................................4-84
Figure 4-39. Detaching the CRT and Removing the
CRT/Display Assembly............................................................4-85
Figure 4-40. Removing the PSI Power Supply..................................................4-86
Figure 4-41. Disconnecting the PSI Power Supply ..........................................4-87
Figure 4-42. Removing the IPD Power Supply .................................................4-88
Figure 4-43. Disconnecting the IPD Power Supply..........................................4-89
Figure 4-44. Disconnecting the Line Filter Assembly......................................4-90
Figure 4-45. Removing the Line Filter Assembly.............................................4-91
Figure 4-46. Removing the DC Interlock Ring..................................................4-92
Figure 4-47. Removing the DC Filter Board......................................................4-93
Figure 4-48. Removing the MDI Power Supply.................................................4-94
Figure 4-49. Disconnecting the MDI Power Supply .........................................4-95
Figure 4-50. Removing the MDI DC Option......................................................4-96
Figure 4-51. Removing the Floppy-Disk Drive..................................................4-97
Figure 4-52. Removing the Module Support Board .........................................4-98
Figure 4-53. Detaching the Interconnect Board ...............................................4-99
Figure 4-54. Detaching the Air Baffle and Fan from the Back Panel............4-100
Figure 4-55. Detaching the Fan from the Back Panel ....................................4-101
Figure 4-56. Removing the Power Switch Coupler ........................................4-102
Figure 4-57. Removing the Power Switch Bracket.........................................4-103
Figure 4-58. Detaching the Ground Wires from the Chassis ........................4-103
Figure 4-59. Removing the Line Filter and Wire Set ......................................4-104
Figure 5-1. Electrical Module Overview ..............................................................5-5
Figure 5-2. Case ....................................................................................................5-6
Figure 5-3. Front Panel .........................................................................................5-8
Figure 5-4. Chassis with CRT and Circuit Boards ...........................................5-10
Figure 5-5. Power Supply: PSI ...........................................................................5-11
Figure 5-6. Power Supply: IPD...........................................................................5-13
Figure 5-7. Power Supply: MDI ..........................................................................5-14
Figure 5-8. Chassis-Mounted Electrical Parts..................................................5-16
Figure 5-9. Back ..................................................................................................5-17
Figure 5-10. Thermal Printer with Cables .........................................................5-18
Figure 5-11. Internal RAM...................................................................................5-19
Figure 5-12. DC Power: Option 17 (PSI and IPD)..............................................5-21
Figure 5-13. DC Power: Option 17 (MDI) ...........................................................5-23
Figure 5-14. Disk Drive Assembly .....................................................................5-24
Figure C-1. Firmware Version Number on the Start-Up Screen.......................C-1

x TFP2A FiberMaster Module-Level Service Manual
List of Tables
Table 1-1. Display Range—Vertical System .......................................................1-8
Table 1-2. Display Range—Horizontal System...................................................1-9
Table 1-3. Display..................................................................................................1-9
Table 1-4. Keyboard..............................................................................................1-9
Table 1-5. Hardcopy............................................................................................1-10
Table 1-6. Mass Storage .....................................................................................1-10
Table 1-7. Operational Characteristics..............................................................1-11
Table 1-8. Physical Characteristics...................................................................1-11
Table 1-9. Environmental Characteristics.........................................................1-12
Table 1-10. FS1300 Singlemode Optical Module..............................................1-14
Table 1-11. FS1500 Singlemode Optical Module..............................................1-15
Table 1-12. FS1315 Singlemode Optical Module..............................................1-16
Table 1-13. FG1300 Singlemode Optical Module .............................................1-17
Table 1-14. FG1315 Singlemode Optical Module .............................................1-18
Table 1-15. FL1300 Singlemode Optical Module..............................................1-19
Table 1-16. FL1500 Singlemode Optical Module..............................................1-20
Table 1-17. FL1315 Singlemode Optical Module..............................................1-21
Table 1-18. FM8500 Multimode Optical Module................................................1-22
Table 1-19. FM1300 Multimode Optical Module................................................1-23
Table 1-20. FM8513 Multimode Optical Module................................................1-24
Table 1-21. Mainframe Options..........................................................................1-25
Table 1-22. Standard Accessories.....................................................................1-25
Table 1-23. Optional Accessories......................................................................1-25
Table 1-24. System Options ...............................................................................1-26
Table 1-25. System Multimode Options ............................................................1-26
Table 1-26. System Singlemode Options..........................................................1-27
Table 1-27. Option Accessories.........................................................................1-27
Table 4-1. External Inspection Checklist ............................................................4-3
Table 4-2. Internal Inspection Checklist..............................................................4-6
Table 4-3. Dynamic Range Pulse Width and Distance Span...........................4-30
Table 4-4. Distance Accuracy Tolerance ..........................................................4-38
Table 4-5. Small Linearity Pulse Width Settings ..............................................4-51
Table 4-6. Loss Measurement Accuracy Pulse Width Settings......................4-53
Table 4-7. Tools Required for Module-Level Maintenance and Repair ..........4-75
Table B-1. GPIB Connections .............................................................................B-1
Table B-2. RS-232 Connections (DCE)...............................................................B-2
Table C-1. Firmware Versions and Features .....................................................C-2
Table D-1. File System Error Codes ...................................................................D-1
Table D-2. Flash Memory Error Codes...............................................................D-3
Table D-3. LED Error Codes................................................................................D-4
Table D-4. Phase 1 Error Codes..........................................................................D-5
Table D-5. Phase 2 Error Codes..........................................................................D-5

TFP2A FiberMaster Module-Level Service Manual xi
Safety Information
The general safety information in these pages is for both operating and servicing
personnel. In addition, specific warnings and cautions appear throughout the manual
where they apply.
Definition of Terms and Symbols
In this manual, a CAUTION flag identifies a potential for equipment or other property
damage.
AWARNING flag identifies a potential for personal injury or property damage.
ADANGER flag identifies an immediate hazard to personal safety or property.
Symbols that may be marked on the equipment indicate the following:
DANGER—High Voltage
ATTENTION—refer to manual
Protective ground (earth) terminal
Power Source
This product is designed to operate from a power source that will not apply more than
250 volts RMS between the supply conductors or between the supply conductor and
ground. A protective ground connection by way of the grounding conductor in the
power cord is essential for safe operation.
!

Safety Summary
xii TFP2A FiberMaster Module-Level Service Manual
Grounding the Instrument
The instrument is grounded through the grounding conductor of the power cord. To
avoid electric shock, plug the power cord into a properly wired receptacle before
connecting to the product input or output terminals.
Danger Arising from Loss of Ground
If you lose the protective ground connection, all accessible conductive parts (including
knobs and controls that appear to be insulating) can render an electric shock.
Use the Proper Power Cord
Use only the power cord and connector specified for your product. Use only a power
cord in good condition. Refer cord and connector changes to qualified service
personnel.
Use the Proper Fuse
To avoid fire hazard, use only a fuse of the correct type, voltage rating, and current
rating as specified in the parts list for your product. Refer fuse replacement to qualified
service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an explosive atmosphere unless it
has been specifically certified for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels. Do not operate
the product without the covers or panel properly installed.
Laser Radiation
Avoid eye exposure to the laser output and open-ended fibers by covering the end or
directing the output at a non-reflective surface. FiberMaster has been classified as a
Class 1 laser product under the Radiation Control and Health Safety Act of 1968.
Repair
Refer all repair problems to qualified service personnel.

TFP2A FiberMaster Module-Level Service Manual 1-1
1 Introduction:
the FiberMaster OTDR
ATTENTION! Read the Safety Information section located at the front of this manual before
operating or servicing FiberMaster.
If you have questions about using or servicing FiberMaster, or have special
application problems, in the U.S. and Canada call our toll-free help line,
1-800-835-9433, or contact your local Tektronix representative.
Product Description
The TEKTRONIX TFP2A FiberMaster Optical Time-Domain Reflectometer (OTDR) is
an optical-fiber test instrument capable of measuring loss characteristics and
displaying faults, splices, and other fiber events in singlemode and multimode optical
fibers.
FiberMaster applies pulses of light to the fiber under test via the optical output
connector. As the pulses travel through the fiber, some light is reflected back to the
instrument. These reflections are processed to display a visual representation of the
fiber on FiberMaster’s cathode ray tube (CRT), where you can make distance and
loss measurements on the fiber under test.
The CRT display is a time plot, read from left to right. The trace starts with the
outgoing pulse, and the time difference is converted to distance in the measurement
process. When you view a typical fiber display, events that are further down the fiber
appear to the right (later in time). Loss is measured on the CRT’s vertical scale.
NOTE This manual explains how to maintain the TFP2A FiberMaster product line, which
includes mainframe models TFP2A (color monitor) and TFP2AM (monochrome
monitor), configured with various options. (Refer to appendix A, Accessories and
Options .) In this manual, the instrument is referred to generically as
"FiberMaster" or "TFP2A," to refer to both the TFP2A and TFP2AM models.

Chapter 1: Introduction
1-2 TFP2A FiberMaster Module-Level Service Manual
Modular, Plug-In Laser Sources
❏The FiberMaster OTDR was designed using a modular approach that allows you
to choose options that answer your specific test and measurement applications.
You can upgrade your instrument configuration as your system requirements
change. FiberMaster can accommodate 850-nanometer (nm) multimode, 1300-
nm multimode, 1310-nm singlemode, and 1550-nm singlemode laser sources in
one or two plug-in modules. The modules can contain either two singlemode or
two multimode lasers, or any single laser, allowing the instrument to be
configured with one to all four wavelengths.
❏Temperature-controlled laser light sources ensure stable wavelength and optical
output for highly accurate measurements.
Accurate, High-Speed
Data Acquisition and Measurement
❏The internal 32-bit microprocessor performs up to 16 million high-speed
averages per acquisition, maximizing the signal-to-noise ratio, giving a clear
display of fiber events.
❏FiberMaster measures a specific fiber feature, with single-keystroke
convenience. In addition, manual adjustments provide extended flexibility in
interpreting the fiber data.
❏An expand function allows you to magnify any portion or feature on the displayed
fiber acquisition.
❏FiberMaster’s high-density acquisition capability offers extended expansion
capacity and highly accurate measurements.
❏A masking function can be performed automatically, or you can set manual
masks to reduce dead zones caused by large Fresnel reflections, improving
measurement resolution.
Automatic and Manual Event Marking
❏The instrument’s event-marking function automatically locates and measures
events on the fiber under test that have splice losses above a user-specified
threshold, or you can also mark events manually.
❏An event table is compiled displaying the measurements for each marked event.
You can edit and print out this table, plus enter notes and mapping information
about each event.

Chapter 1: Introduction
TFP2A FiberMaster Module-Level Service Manual 1-3
Extended Memory and
Storage Capacity
❏FiberMaster offers both a current memory, containing the current data
acquisition, and a reference memory, for previously acquired fiber waveform
data. A dual-trace mode makes it possible to display the contents of both current
and reference memory simultaneously, allowing you to compare a current
optical-fiber acquisition to historical data.
❏Mass-storage devices (the standard floppy-disk drive and optional internal RAM)
permit unlimited storage of waveform and settings data on both removable and
internal media.
Hardcopy Options
❏You can choose the optional high-speed internal thermal printer, or use
FiberMaster with either an IEEE 488 general-purpose interface bus (GPIB)
external plotter or printer, or an RS232 external plotter or printer. One press of a
button on the instrument’s front panel provides a 15-second hard copy of the
displayed waveform and instrument settings on the internal printer.
Remote Control Capability
❏The FiberMaster OTDR can be operated under the remote control of an
instrument controller or a computer with a GPIB interface, using an IEEE 488
general-purpose interface bus, or via the RS-232 serial interface.
Additional Features
❏An easy-to-use menu system simplifies setting instrument measurement
parameters.
❏You can upload and download waveform and settings data using the RS232
interface and XModem protocol.
❏The 7-inch diagonal, high-resolution color or monochrome CRT provides a
comprehensive on-screen readout of waveform and measurement data, and
instrument settings.
❏Online help displays context-sensitive operator assistance at the press of a
button.
❏Rugged, portable construction is also lightweight—under 35 pounds (15
kilograms).

Chapter 1: Introduction
1-4 TFP2A FiberMaster Module-Level Service Manual
Using this Manual
This manual is for servicing the TFP2A FiberMaster OTDR. To prevent injury to
yourself or damage to the OTDR, do not attempt service unless:
❏You are a qualified service person,
❏You have read the Operator and Service Safety Summary at the beginning of this
manual.
❏You have read the Strategy for Servicing section in this chapter.
When using this manual for servicing, be sure to observe all warnings, cautions, and
notes.
Strategy for Servicing
NOTE Throughout this manual, any field-replaceable component, assembly, or part of
this optical time-domain reflectometer is referred to generically as a module.
This manual contains all the information needed for periodic maintenance of the
FiberMaster OTDR, as well as all information for corrective maintenance down to the
module level. This means that the procedures, diagrams, and other troubleshooting
aids help isolate failures to a specific module, rather than to components of that
module. Once a failure is isolated, replace the module with a new unit obtained from
the factory.
All modules are listed in chapter 5, Replaceable Parts . To isolate a failure to a
module, use the fault isolation procedures given in chapter 4, Maintenance . To
remove and replace any failed module, follow the instructions in the same chapter.

Chapter 1: Introduction
TFP2A FiberMaster Module-Level Service Manual 1-5
Manual Structure
The FiberMaster Module-Level Service Manual consists of six chapters and two
appendices, containing the following information:
❏Chapter 1, Introduction , provides a description of the FiberMaster OTDR,
unpacking and repacking instructions, and instrument specifications.
❏Chapter 2, General Operating Instructions , describes the functions of each of the
front- and rear-panel controls and connectors, at a level appropriate for servicing
the instrument. (For complete operating instructions, refer to the FiberMaster
User Manual .)
❏Chapter 3, Theory of Operation , contains a block-level description of the
instrument’s operation, as well as a block-level diagram.
❏Chapter 4, Maintenance , contains the information needed to do periodic and
corrective maintenance on the FiberMaster, including inspection and cleaning,
performance verification and adjustment, troubleshooting, and module removal
and replacement procedures.
❏Chapter 5, Replaceable Parts , includes a list of module-level replaceable parts
and exploded-view drawings of their locations in the instrument.
❏Chapter 6, Diagrams , contains module-level block diagrams.
❏Appendices include data sheets for recording instrument performance
information, GPIB and RS232 connection tables, instructions on upgrading
firmware, and a listing of error codes.
Manual Conventions
This manual uses certain conventions that you should be familiar with before doing
service.
Terminology used in the FiberMaster manuals is in accordance with industry practice.
Abbreviations are in accordance with ANSI Y1.1-1972, with exceptions and additions
explained in parentheses after the abbreviation. Graphic symbology is based on
ANSI Y32.2-1975. Logic symbology is based on ANSI Y32.14-1973 and
manufacturers’ data books or sheets. A copy of ANSI standards can be obtained
from the Institute of Electrical and Electronic Engineers, New York, New York 10017.
Modules
Throughout this manual, any replaceable component, assembly, or part of the
FiberMaster OTDR is referred to generically as a module. In general, a module is an
assembly, (e.g., a circuit board), rather than a component, (e.g., a resistor or
integrated circuit).

Chapter 1: Introduction
1-6 TFP2A FiberMaster Module-Level Service Manual
Warranty Information
Tektronix warrants that this product will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If any such
product proves defective during this warranty period, Tektronix, at its option, either
will repair or replace the defective product without charge for parts and labor, or will
provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, the customer must notify Tektronix of
the defect before the expiration of the warranty period and make suitable
arrangements for the performance of service. The customer shall be responsible for
packaging and shipping the defective product to the service center designated by
Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the
product to the customer if the shipment is to a location within the same country as the
service center. The customer shall be responsible for paying all shipping charges,
duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper
use or improper or inadequate maintenance and care. Tektronix shall not be
obligated to furnish service under this warranty a) to repair damage resulting from
attempts by personnel other than Tektronix representatives to install, repair, or
service the product; b) to repair damage resulting from improper use or connection to
incompatible equipment; c) to repair any damage or malfunction caused by the use of
non-Tektronix supplies; or d) to service a product that has been modified or
integrated with other products when the effect of such modification or integration
increases the time or difficulty of servicing the product.
This warranty is given by Tektronix with respect to this product in lieu of any other
warranties, express or implied. Tektronix and its vendors disclaim any implied
warranties of merchantability or fitness for use for a particular purpose. Tektronix’
responsibility to repair or replace defective products is the sole and exclusive remedy
provided to the customer for breach of this warranty. Tektronix and its vendors will
not be liable for any direct, special, incidental, or consequential damages irrespective
of whether Tektronix or the vendor has advance notice of the possibility of such
damages.