Humphrey
Field Analyzer
Series 700
®
COMPANY CONFIDENTIAL
COMPANY CONFIDENTIAL
COMPANY CONFIDENTIALCOMPANY CONFIDENTIAL
Part No. 30122 Rev B
December 2001
Field Service Guide
PROPRIETARY NOTICE
Information contained in this document is copyrighted by Humphrey Systems, a division of Carl Zeiss,
Inc., and may not be reproduced in full or in part by any person without prior written approval of
Humphrey Systems. Its purpose is to provide the User with adequately detailed information so as to
repair, maintain, and order spare parts for the instrument supplied. Every effort has been made to keep
the information contained in this document current and accurate as of the date of publication or
revision. However, no guarantee is given or implied that the document is error-free or that it is
accurate with regard to any specification.
TRADEMARK CREDITS
Humphrey Field Analyzer is a registered trademark of Humphrey Systems;
StatPac and Ensemble are trademarks of Humphrey Systems;
Loctite is a trademark of Loctite Corporation;
LaserJet and DeskJet are registered trademarks of Hewlett-Packard Corporation;
Windows is a trademark of Microsoft Corporation;
IBM is a registered trademark of the International Business Machines Corporation.
Revision A
Revision B
Humphrey Systems
5160 Hacienda Drive
Dublin, CA 94568
www.czos.com
©
1994 by Humphrey Systems, a division of Carl Zeiss, Inc. All rights reserved.
©
2001 by Humphrey Systems, a division of Carl Zeiss, Inc. All rights reserved.
ii
REVISION CONTROL LIST
Document:
Part No.:
Issued Date: December 2001
Listed at the bottom of each page is the part number of the field service guide, along with the
Revision letter and date for that page (for example, 30122B2001). Subsequent revisions to a page
will be noted by a corresponding change to the Revision letter and date.
Pages in this document are at Revision B unless noted otherwise below.
Page
Revision Page Revision Page Revision Page Revision
Field Analyzer Series 700 Service Guide
30122 - Revision B
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Table of Contents
Section 1 - General Information
1.1 About This Field Service Guide ........................................ 3
1.1.1 General Information ........................................... 3
1.1.2 Conventions ................................................. 4
1.2 About Service Bulletins............................................... 4
1.3 HFA II Service Strategy .............................................. 5
1.3.1 Two-Level Service Strategy ..................................... 5
1.3.2 Three Steps to Completing an HFA II Service Call .................... 5
1.3.3 HFA II Field Service Paperwork Requirements ....................... 6
1.4 Configuration Parameters............................................. 8
1.5 Precautions........................................................ 8
General Safety Precautions ..................................... 8
Instrument Precautions ......................................... 9
1.6 Internal Layout .................................................... 10
1.7 Special Topics .................................................... 10
1.7.1 The Touch Screen ........................................... 10
1.7.2 Gaze Tracking .............................................. 11
1.7.3 Head Tracking / Auto Pupil / Vertex Monitoring ..................... 14
1.7.4 HFA II Light Intensity Fundamentals ............................. 15
1.8 Peripherals ....................................................... 15
1.9 Specifications ......................................................18
Section 2 PM and System Checkout
2.1 System Checkout Checklist............................................ 3
2.2 Preventive Maintenance Procedure ..................................... 9
2.3 Top Filter Replacement ............................................. 11
Section 3 Parts Removal / Replacement
3.1 General Instructions ................................................. 4
3.1.1 Bowl Identification ............................................. 5
3.1.2 Removal from Power Table ..................................... 10
3.2 Front Cover Assembly Removal ....................................... 11
3.3 Rear Cover Assembly Removal ....................................... 12
3.4 Operator Panel Assembly Removal .................................... 13
3.5 Drive Housing Assembly Removal ..................................... 15
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3.6 CPU PCB Removal ................................................ 19
3.7 Motor Driver PCB Removal .......................................... 20
3.8 Power Supply Removal ............................................. 21
3.9 CRT PCB Removal................................................. 23
3.10 CRT Removal..................................................... 24
3.11 Touch Screen Removal ............................................. 26
3.12 Fixation Interconnect PCB Removal .................................... 27
3.13 CCD Camera Removal.............................................. 28
3.14 Central Fixation LED Assembly Removal ................................ 30
3.15 Projection Assembly Removal ........................................ 30
3.16 Projection Interconnect PCB Removal .................................. 32
3.17 Film Wedge/Motor Removal .......................................... 32
3.18 Glass Wedge/Motor Removal ......................................... 33
3.19 Color Wheel / Aperture Wheel Removal ................................. 34
3.20 Carriage Motor Removal ............................................ 35
3.21 Shutter Removal................................................... 36
3.22 Shutter Motor Removal ............................................. 37
3.23 Carriage Motor Belt Removal ......................................... 38
3.24 Horizontal (X-axis) Turret Motor Removal ............................... 38
3.25 Horizontal (X-axis) Turret Motor Belt Removal ............................ 39
3.26 Vertical (Y-axis) Turret Belt/Motor Removal .............................. 41
3.27 Brightness Detector (PCB) Replacement................................. 42
3.28 Lower Turret Removal .............................................. 43
3.29 Turret Cable Assembly Removal....................................... 44
3.30 Chinrest/Headrest Switch Assembly Removal ............................. 44
3.31 Chinrest Y-axis Belt/Motor Removal .................................... 45
3.32 Patient Support Horizontal (X-axis) Belt/Motor Removal .................... 46
3.33 Chinrest Vertical Slide and Lead Screw Removal .......................... 49
3.34 Chinrest Horizontal Slide Removal ..................................... 50
3.35 Trial Lens Holder Assembly Removal ................................... 51
3.36 Top Fan Removal.................................................. 52
3.37 Bowl IR LED Assembly Removal ...................................... 53
3.38 Blue/Yellow Module / Bowl Plug Removal ............................... 54
3.39 Bowl Removal .................................................... 55
3.40 Reflex Gaze LED Removal ........................................... 56
3.41 Bowl Lamp Assembly Removal ....................................... 57
3.42 IR Bowl Plug Removal/Installation ..................................... 58
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3.43 Quarter-Turn Fastener Replacement.................................... 59
Section 4 Adjustment / Calibration
4.1 Introduction ....................................................... 3
4.2 Related Procedures.................................................. 5
4.2.1 HFA II Calibration and Service Guidelines .......................... 5
4.3 Calibration / Diagnostics Access ........................................ 6
4.4 Show Dialog....................................................... 6
4.5 System Log ....................................................... 6
4.6 Database ......................................................... 6
4.7 Video Test Pattern .................................................. 6
4.8 Calibration ........................................................ 7
4.8.1 Verification (obtaining Before and After light intensity calibration values) . . . 7
4.8.1.1 Intensity / Spot Ratio................................... 7
4.8.1.2 Exerciser ........................................... 11
4.8.1.3 QA Tests ........................................... 12
4.8.2 Mechanical ................................................. 12
4.8.2.1 Projector ........................................... 12
4.8.2.2 Shutter ............................................ 13
4.8.2.3 Aperture ........................................... 14
4.8.2.4 Color ............................................. 15
4.8.2.5 Right / Left Home .................................... 16
4.8.2.6 Offset ............................................. 16
4.8.2.7 Focus ............................................. 16
4.8.2.8 Detector ........................................... 17
4.8.2.9 Target ............................................. 18
4.8.3 Intensity ................................................... 20
4.8.3.1 Projector ........................................... 20
4.8.3.1.1 White .......................................... 20
4.8.3.1.2 Blue ........................................... 21
4.8.3.2 Bowl .............................................. 23
4.8.3.2.1 White .......................................... 23
4.8.3.2.2 Yellow ......................................... 24
4.8.3.3 Wedge ............................................ 25
4.8.3.4 Blue Correction...................................... 26
4.8.4 Print Cal Values ............................................. 30
4.8.5 Miscellaneous ............................................... 30
4.8.6 Camera ................................................... 30
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4.8.6.1 Camera Position / Size ................................ 30
4.8.6.2 Gaze Position / Size .................................. 36
4.8.6.3 Camera Intensity..................................... 37
4.9 Adjustments ...................................................... 39
4.9.1 Patient Support Horizontal Leadscrew Adjustment ................... 39
4.9.2 Belt Tension ................................................ 40
4.9.3 Edge Detector............................................... 40
4.9.4 Touch Screen ............................................... 40
4.9.5 CRT Adjustments ............................................ 41
4.9.5.1 Kristel CRT Driver Board Adjustments .................... 41
4.9.5.2 Z-Axis CRT Driver Board Adjustments .................... 44
4.9.5.3 CRT Yoke Adjustments ................................ 46
4.9.6 Trial Lens Holder ............................................ 49
4.9.7 Camera Focus .............................................. 53
4.9.8 Bowl IR LED / Mirror ......................................... 54
Section 5 Troubleshooting
5.1 Introduction ....................................................... 3
5.2 General Guidelines for Assembly Level Troubleshooting ..................... 3
5.3 A Guide to HFA II Service Diagnostic Aids ............................... 7
5.4 Software Module Identifiers ........................................... 8
5.5 HFA II Motor Exerciser and QA Test Points ............................... 9
5.6 Diagnostic Tests ................................................... 11
5.7 Printrex Printer Self Tests and Error Handling ............................. 30
5.7.1 Printer Self Test .............................................. 30
5.7.2 Printrex Printer Errors and Error Handling .......................... 30
5.8 Power - On Self Tests ................................................ 32
5.8.1 Motor Driver Board Startup ..................................... 32
5.9 Startup State Errors ................................................. 34
5.10 Beep Codes ....................................................... 40
5.11 Hexadecimal Error Codes ............................................ 41
5.12 Common Error Messages/Solutions ..................................... 43
Section 6 Diagrams
Figure 6-1 System Interconnect Diagram .................................. 3
Figure 6-2 Projection Path ............................................. 5
Figure 6-3 CPU PCB Functions and Connections ........................... 6
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Figure 6-4 Motor Driver PCB ........................................... 7
Figure 6-5 Projection Assembly ......................................... 8
Figure 6-6 Fixation Interconnect PCB (Old) ................................ 9
Figure 6-7 Fixation Interconnect PCB (New) ............................... 9
Figure 6-8 Power Entry and Power Supply ................................ 10
Figure 6-9 CPU PCB Component Locations .............................. 11
Figure 6-10 Motor Driver Board Component Locations ...................... 12
Section 7 Parts
7.1 Introduction ........................................................ 3
7.2 Parts Orders — U.S. Domestic Service Operations ........................... 3
7.3 Parts Orders — International Service Operations ............................ 3
7.4 Returning Instruments / Defective Parts ................................... 4
7.4.1 Equipment Return Authorization .................................. 4
7.4.2 Packing the Instrument for Shipment ............................... 4
7.4.3 Returning Defective Parts ........................................ 4
7.5 Recommended Spares ................................................ 5
7.6 Level I Parts Lists .................................................... 6
7.6.1 Accessories/Supplies/Consumables ................................. 6
7.6.2 Software ..................................................... 7
7.6.3 Peripherals ................................................... 7
7.7 Illustrated Parts Breakdown ............................................ 9
7.7.1 Shipping Materials and Repack Instructions ........................ 10
7.7.2 Miscellaneous–1 ............................................. 12
7.7.3 Miscellaneous–2 ............................................. 14
7.7.3.1 Upper Fan Assemblies .......................... 16
7.7.4 Patient Support Assembly ...................................... 17
7.7.5 Chinrest / Trial Lens Holder Assembly ............................ 19
7.7.6 Projection Assembly .......................................... 20
7.7.7 Bowl Assembly (Old Style) ..................................... 27
7.7.7.1 Bowl Assembly (New Style) ...................... 29
7.7.7.2 Bowl Assembly (New Style) ...................... 31
7.7.8 Operator Panel Assembly ...................................... 33
7.7.9 B/Y Lamp Assembly .......................................... 35
7.7.10 Drive Mounting Assemblies .................................... 37
7.7.11 Power Table / Printer Assemblies ................................ 39
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Appendices
Appendix A. Tools, Test Equipment and Service Supplies .................... A - 1
A.1 List of Tools, Test Equipment and Service Supplies ............... A - 1
A.2 The Special Tools - What They Are / What They Do .............. A - 3
A.2.1 Soligor Light Meter Setup ........................... A - 3
A.2.2 Soligor Mount Adaptor ............................. A - 3
A.2.3 Bowl Shroud..................................... A - 3
A.2.4 Tool Stand Assembly .............................. A - 5
A.2.5 CRT Overlay..................................... A - 5
A.2.6 Spot Positioning Cross Fixture ....................... A - 5
A.2.7 Brightness Detector Alignment Target .................. A - 6
A.2.8 Projection Mount ................................. A - 7
A.2.9 Operator Panel Extension/Support .................... A - 8
A.2.10 Hard Drive LED Assembly .......................... A - 9
A.2.11 Service Key ...................................... A - 9
A.2.12 Diagnostic Support Tool ............................ A - 9
A.2.13 Loopback Tool ................................... A - 9
A.2.14 Static Protection Kit............................... A - 10
A.2.15 Communications Terminals ........................ A - 10
A.2.16 How To Set Up The P-Factor Diskette ................ A - 11
Appendix B. The Interface Ports ........................................ B - 1
B.1 General Information ....................................... B - 1
B.2 RS-232 Interface Hardware and Pin Assignments ................ B - 2
Appendix C. Data Transfer ............................................ C - 1
C.1 Transfer Modes............................................ C - 1
C.2 Serial Data Transfer ........................................ C - 3
C.3 Installing the Serial I or Serial II Transfer Disk .................... C - 5
C.4 Data Transfer Procedure .................................... C - 5
C.5 Floppy Drive Data Transfer .................................. C - 7
C.6 HFA II to HFA II-i Serial Data Transfer ........................ C - 11
C.7 HFA II to Ensemble Serial Data Transfer ....................... C - 12
C.8 HFA II to Third Party Programs Serial Data Transfer .............. C - 14
Appendix D. Printer Types / Configuration ................................ D - 1
Appendix E. External Communications with the HFA II ...................... D - 1
E.1 General Information ....................................... E - 1
E.2 Communications Terminal Choices ........................... E - 1
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E.3 Choosing and Using a Communications Program ................ E - 2
E.4 Communications Cable .................................... E - 3
E.5 HFA II Service Key ........................................ E - 4
E.6 Establishing Communication Between the Communications
Terminal and the HFA II.................................... E - 4
E.7 Configuring HFA II Communication Parameters in Windows
Terminal Program ........................................ E - 5
E.8 Saving the Communication Parameters in Windows Terminal
Program ................................................ E - 7
E.9 Using the Saved Communication Parameters in Windows
Terminal Program ........................................ E - 7
Appendix F. Operating System ......................................... F - 1
Appendix G. P Initializing the EEPROM
P Setting CPU Identity
P Setting the Hardware Options
P Setting the Software Options....................... G - 1
G.1 Initializing the EEPROM .................................... G - 3
G.2 Setting CPU Identity ....................................... G - 4
G.3 Setting the Hardware Options ............................... G - 6
G.3.1 Using a Communication Terminal .................... G - 6
G.3.2 Using the Diagnostic Support Tool (DST) .............. G - 10
G.4 Setting the Software Options ............................... G - 14
Appendix H. Calibration Printouts....................................... H - 1
H.1 Cal / Wedge Printout ....................................... H - 1
H.2 Automated Light Intensity Printouts ............................ H - 8
Appendix I. Service Forms............................................. I - 1
Appendix J. System Screens and Logs .................................... J - 1
J.1 Boot Screen .............................................. J - 1
J.2 Unit Configuration Screen ................................... J - 2
J.3 System Log .............................................. J - 3
Appendix K. Data Loss Recovery ....................................... K - 1
K.1 Data Loss Prevention Tips ................................... K - 1
K.2 Database Structure ......................................... K - 2
K.3 The Five “Rs” of Database Recovery ........................... K - 2
K.4 Database Utilities .......................................... K - 3
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K.4.1 Rebuild Hard Disk Database .......................... K - 3
K.4.2 Rebuild Floppy Database ............................ K - 4
K.4.3 Delete Hard Disk Database ........................... K - 4
K.4.4 Delete Temporary Database .......................... K - 4
K.4.5 Reconstruct Database ............................... K - 4
K.4.6 Secondary Database Utilities.......................... K - 4
K.5 Floppy Diskette - Troubleshooting Dialogue ...................... K - 5
K.6 Hard Disk Drive - Troubleshooting Dialogue ..................... K - 6
K.7 Streamer Tape Cartridge .................................... K - 7
Appendix L. Initializing the Hard Disk..................................... L - 1
Appendix M. Loading Software ......................................... M - 1
Appendix N. Special Software Options .................................... N - 1
Appendix O. Upgrades ................................................ O - 1
Appendix P. Cable Diagrams - Data Transfer ............................... P - 1
Appendix Q. Cleaning Optics ........................................... Q - 1
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Section 1 - General Information
1.1 About This Field Service Guide ............................... 1 - 3
1.1.1 General Information ................................. 1 - 3
1.1.2 Conventions....................................... 1 - 4
1.2 About Service Bulletins...................................... 1 - 4
1.3 HFA II Service Strategy ..................................... 1 - 5
1.3.1 Two-Level Service Strategy ........................... 1 - 5
1.3.2 Three Steps to Completing an HFA II Service Call .......... 1 - 5
1.3.3 HFA II Field Service Paperwork Requirements ............. 1 - 6
1.4 Configuration Parameters.................................... 1 - 8
1.5 Precautions............................................... 1 - 8
General Safety Precautions .................................. 1 - 8
Instrument Precautions ...................................... 1 - 9
1.6 Internal Layout ........................................... 1 - 10
1.7 Special Topics ........................................... 1 - 10
1.7.1 The Touch Screen ................................. 1 - 10
1.7.2 Gaze Tracking .................................... 1 - 11
1.7.3 Head Tracking / Auto Pupil / Vertex Monitoring ........... 1 - 14
1.7.4 HFA II Light Intensity Fundamentals ................... 1 - 15
1.8 Peripherals .............................................. 1 - 15
1.9 Specifications ............................................ 1 - 18
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1.1 About This Field Service Guide
1.1.1 General Information
This Field Service Guide is the Field Service reference for troubleshooting, repair, adjustment,
and calibration of the Humphrey HFA II Field Analyzers, manufactured by Humphrey
Systems.
This field service guide is designed to support Level 1 Field Service, which employs modular
replacement of printed circuit boards and other assemblies that are most effectively repaired
at a central repair facility. This is the service strategy used in U.S. domestic Field Service, and
in Humphrey Service training classes. See Section 1.3 for additional information regarding
Level 1 and Repair Center service.
The procedures in this field service guide assume that the reader is familiar with operation of
the instrument. Complete operating instructions are contained in the HFA II User's
Guide. Information contained in the User's Guide is not repeated in this field service guide.
The User's Guide can be ordered separately by standard Humphrey parts order. Refer to
Section 7 for the User's Guide parts information.
The general layout of the field service guide is shown below. For greater detail, please refer to
the Table of Contents.
Level 1 Field Service Guide Layout
Section 1 General Information
Section 2 Preventive Maintenance & System Checkout
Section 3 Parts Removal/Replacement
Section 4 Adjustment/Calibration
Section 5 Troubleshooting
Section 6 Diagrams
Section 7 Parts
Appendices
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1.1.2 Conventions
The following conventions apply in this manual:
P The terms left, right, front and back of the instrument are as viewed from the
patient position, unless noted otherwise.
P Dimensions are given in inches unless noted otherwise.
1.2 About Service Bulletins
Field Service Bulletins are a vital element of service support. Bulletins are used to quickly
convey technical information on a variety of field service topics, including:
P instrument design changes
P technical problems and
corrections
P software updates
P new troubleshooting proce-
dures
P problem alerts
Service bulletins are used to issue revised pages for service manual/service guide updates.
Your service bulletins should be filed where easily accessible for quick reference.
P service manual revisions
P upgrade announcements/
procedures
P system checkout – checklist
P service disclaimer forms
P system work sheets
NOTICE
Field Service Bulletins are Confidential and Proprietary, for the sole use of
personnel employed by Humphrey Systems, Zeiss, Humphrey affiliates, and
authorized Humphrey distributors.
Humphrey has a well-deserved reputation for high quality, reliable instruments,
unsurpassed in the industry. However, in the hands of an unethical competitor,
relatively minor issues discussed in service bulletins can be distorted to cause the
instrument owner unjustified concerns regarding the instrument.
As a Humphrey affiliate, employee, or distributor you are required to handle your
service bulletins as appropriate for proprietary and confidential information.
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1.3 HFA II Service Strategy
1.3.1 Two-Level Service Strategy
A two-level service strategy is used for the HFA II: Level 1 for on-site service; and Level 2 for
Repair Center service. Level 1 service employs modular replacement, wherein faulty circuit
boards and certain other assemblies are replaced rather than repaired on-site. These faulty
assemblies are shipped to a Humphrey Repair Center for repairs. There are also certain
procedures that require special equipment available only at a Repair Center.
Designated Repair Centers (currently Dublin, CA and Jena, Germany) are the second level of
service for the HFA II. The Repair Centers perform major circuit board troubleshooting and
repair, plus any other service action that requires special equipment or procedures not
available in the field.
Several of the circuit boards in the HFA II are multilayer boards and use Surface Mount
Technology (SMT) components. These boards require special equipment and techniques for
troubleshooting and repair.
All service procedures (including instrument calibration) can be performed in the field, except
for those listed below. For Humphrey Systems U.S. Domestic operations, the following
procedures must be performed at the Humphrey Repair Center.
P Circuit board troubleshooting and component replacement
P Repair of floppy, tape, and hard drives.
P Alignment of projection carriage rails and first projection mirror (top turret mirror)
P Repair of power supply assembly
P Repair of camera assembly
1.3.2 Three Steps to Completing an HFA II Service Call
The basic approach to an HFA II service call is outlined below. This typical process includes
collection of general instrument calibration data and light intensity data both Before service
and again After service. The process is described in detail in Section 4.8.1. For guidelines,
refer to HFA II Field Service Paperwork Requirements (Section 1.3.3).
1. Obtain the Before Light Intensity instrument data.
This step assumes that the HFA II is operable; that is, it will power up to the Main
Menu without error. This data gives the service representative a base from which
to evaluate the light intensity operation of the instrument, and a point of
comparison if recalibration is required.
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If a repair is required to render the instrument operable, and as long as the repair
does not affect the original light intensity data, the repair can be performed and
then the Before data can be acquired.
The following repairs will affect light intensity data:
• EEPROM replacement or initialization;
• cleaning or replacement of the ND wedges, color wheel*, or brightness
detector;
• replacement of the Motor Driver PCB.
*
Note - Cleaning or replacing the color wheel will not affect the white/white
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Before light intensity data; it only affects the blue light intensity data.
2. Perform the needed instrument service.
This step includes any parts replacement, adjustments, calibration, cleaning, etc. to
repair, update and/or upgrade the instrument.
3. Obtain the After light intensity instrument data (4.8.1) if the Before data was not within
specifications, or if something was done during service that affects light intensity (see list
in step 1).
When instrument service has been fully completed (but before reinstalling the outer
covers), a final evaluation of the instrument may be required (see Section 2.1,
System Checkout). During this step, the Before and After light intensity data are
compared. If necessary, a Calibration Notice is given to the customer.
1.3.3 HFA II Field Service Paperwork Requirements
The following guide identifies the paperwork that must be completed and sent to Humphrey
Customer Service following each service call or preventive maintenance visit on the HFA II by
U.S. Domestic service representatives. For all service reps, this guide identifies actions
essential to properly perform various types of service calls on the HFA II.
For all service calls:
FSR
G
Before Foveal ‡
G
If replacing/initializing EEPROM; cleaning/replacing brightness detector, ND wedges, or
color wheel; or replacing Motor Driver PCB:
If obtainable, include all items from list above under
G
below under "Additional if light intensity recalibration is required". If possible, obtain
Before paperwork prior to the repair.
"For all service calls," plus items listed
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Additional if upgrade to Blue-Yellow:
Before and After Light Intensity Verification Printouts
G
After Foveal ‡
G
Calibration Notice*, if needed.
G
If performing PM:
Covered by items listed above under "For all service calls."
G
Before Light Intensity Verification Printouts
G
Additional if light intensity recalibration is required:
Before and After Light Intensity Verification Printouts
G
After Foveal ‡
G
Calibration Notice*, if needed.
G
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Notes -
* Formerly called "Doctor Card" or "Doctor Letter."
‡ For Model 720, see Section 2 in the HFA II Service Manual.
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1.4
Configuration parameters can be entered and stored in the system by the user. This data is
stored on the hard disk and in the EEPROM. Calibration data also is stored in the EEPROM.
There is the possibility that this data may become altered or erased during servicing of the
instrument.
To minimize the possibility of altering the configuration parameters or doctor setups during
service, the following practices should be observed.
Configuration Parameters
• Whenever possible, when servicing a customer's instrument, backup the customer-
selected configuration. This option is available via the Setup and Additional Setup
menus, in A9 and later software.
• When finished servicing the instrument, restore the customer's configuration
selections.
• Never intentionally alter the customer's existing doctor setups.
1.5 Precautions
The following precautions should be observed whenever the HFA II is being installed or
serviced. Point out to the customer any potential hazard and the appropriate corrective
action.
WARNING: The CRT and associated circuitry can deliver a lethal
shock. Always employ standard high-voltage safety precautions when
working around the CRT circuitry. DO NOT use metal tools when
making CRT adjustments.
General Safety Precautions
1. The instrument is equipped with a grounding-pin power plug. The instrument must be
plugged into an outlet with a properly grounded receptacle.
2. Ensure that the fuses installed in the instrument and the power table are of the proper
rating.
3. Use of an extension cord is not recommended. Doing so may compromise the safety of
the operator and/or patient.
4. Do not overload the AC outlet being used to operate the instrument.
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5. If the power cord or plug on the instrument is damaged, a shock or fire hazard may
result. Do not allow continued operation of the instrument until the damaged cord or
plug has been replaced.
6. To prevent personal injury and damage to the instrument:
P Use only the power table recommended by Humphrey Systems.
P Do not place the instrument on uneven or sloped surfaces.
7. For stability of the power table, strictly adhere to the following guidelines:
P Ensure that the instrument is secured to the power table with the screws provided.
P Do Not place the instrument near the operator end of the table during setup,
service, or operation.
P Before servicing the instrument, depending on the table type, cycle the table to its
lowest position and either lock the table top slider in its center rear-most position or
lock the table top in it’s center position.
8. Ensure that the instrument is installed on a stable, vibration-free surface.
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9. Be cautious when you first touch the projection assembly. The projection assembly
can become extremely hot any time the projection bulb is lit for prolonged periods,
such as during sustained patient testing.
10. The bowl lamp voltage is approximately 550 volts — AVOID TOUCHING!
Instrument Precautions
1. When the instrument is being unpacked, save the shipping materials for possible future
use. Whenever the instrument is shipped, it must be properly packed to prevent
damage. Do Not place objects in the bowl during shipment of the HFA II.
2. When spare parts are received, save the shipping materials for returning the defective
part(s), if appropriate.
3. Handle interconnecting cables carefully. Many of these are constructed of extremely
small coax cable and are easily damaged.
4. To avoid possible damage to circuit board components, do not plug/unplug cables while
power is applied to the instrument.
5. Do Not use Windex® to clean the touch screen, as it can scratch plastics. The
recommended cleaner is a 50% solution of isopropyl alcohol and water. Otherwise, use
a commercially available anti-static plastic cleaner.
6. Use extreme care whenever working in or near the bowl to avoid causing marks or
scratches to the inner bowl surface.
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7. Do not rub the inner bowl surface while attempting to clean it; rubbing will cause a
noticeable polished area in the bowl.
8. Do not touch the glass surface of the projection lamp with your bare fingers. Any oil, dirt
or grease on the lamp can shorten its effective life and diminish light output.
9. Do not place items on top of the unit; the internal mechanism of the instrument is very
close beneath the top cover.
10. Ensure that none of the ventilation openings in the instrument are blocked. Excessive
heat buildup within the instrument can cause instrument failures.
11. DO NOT flex the circuit boards. This instrument uses multilayer circuit boards.
Multilayer circuit boards are inherently susceptible to damage by excessive flexing.
12. Proper ElectroStatic Discharge (ESD) precautions must be observed whenever you are
disassembling or handling the instrument's circuitry. Many of the components are
extremely vulnerable to static discharge damage. A Field Service Static Protection Kit is
available for order and must be used for ESD protection during service of this
instrument. Refer to Appendix A for details regarding this kit.
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13. An abrupt, harsh noise will ensue if the chinrest comes up against its travel limit during
chinrest movement. Moving the chinrest up against its limits for a few seconds causes no
mechanical harm.
1.6 Internal Layout
The parts drawings in Section 7 of this Service Manual illustrate the internal physical layout of
the instrument. Diagrams in Section 6 illustrate the functional layout of the instrument.
1.7 Special Topics
1.7.1 The Touch Screen
The HFA II uses a transparent, analog, resistive-membrane touch screen. It is constructed of
two pieces of thin, highly linear, electrically conductive film (Indium Tin Oxide). The two
pieces of film are separated by a small air gap. The air gap is maintained by small (.001"),
dielectric spacer dots.
Each film sheet has a set of parallel bus bars applied along opposite edges of the film. The
two sheets are oriented so that the bus bars on one sheet are perpendicular to those on the
other sheet. Slight pressure will cause the conductive surfaces to come into contact. The
location of the contact point can be detected by a logic circuit measuring the voltage found at
that particular point. The analog type of touch screen gives a "voltage divider" analog
response that allows positional determination.
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1.7.2 Gaze Tracking
The HFA II uses two systems for measuring patient fixation: the standard Heijl-Krakau blindspot monitoring and the new IR Gaze Tracking System. Both methods can be used, either
together or alone, or they can both be turned off, as required. This description covers the IR
Gaze Tracking System.
The direction of a patient's gaze is determined in two steps: first, a reflex marker is established
on the corneal surface; and second, the location of the pupil center is determined.
Gaze tracking is initialized in the following manner when a selected test is first started:
The patient is asked to fixate on the central illumination LED. Gaze tracking turns on the
reflex gaze IR LED located on the (old) bowl just to the left of center or located on the (new)
bowl just under center. Light from the LED is reflected off the cornea, and back to the IR
sensitive camera (Figure 1-1). The majority of the cornea appears black except for the
reflected spot. This image is digitized and stored in memory. The reflected spot is referred to
as the reflex marker (Figure 1-2). Because the corneal surface is rounded, the reflex marker
will move very little even if the patient's eye moves, and thus the marker becomes a
(relatively) stationary reference point.
Next, the system locates the pupil center by illuminating the entire eye with the two IR LEDs
located either in the bottom of the bowl, or in the trial lens holder (when in the raised
position). The iris appears bright and the pupil dark (Figure 1-3). This image is also digitized
and stored in memory. It is the relationship between the location of the reflex marker on the
cornea and the location of the pupil that determines fixation (Figure 1-4).
Note - When gaze tracking is being initialized, it appears as repetitive "strobing" when
viewed by the operator via the video insert on the HFA II monitor.
During a test, each time a spot is projected into the bowl, the locations of the reflex marker and
the center of the pupil are compared to the initial images stored in memory. If the patient is
fixating correctly, the positional relationship between the reflex marker and the pupil center will
be the same as that of the stored images (Figure 1-4). If the patient is off fixation, the positional
relationship between the reflex marker and the pupil center will be different, as in Figure 1-5.
The greater the misalignment, the higher the mark on the Gaze Graph (Figure 1-6).
(continued)
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Spikes that appear on the Gaze Graph (Figure 1-6) are analyzed as follows:
P Upward spikes indicate that the patient has lost fixation;
• a spike that reaches the top horizontal line (or higher) indicates 10 degrees (or
more) off fixation;
• a spike that extends halfway to the top line indicates 5 degrees off fixation.
P Downward spikes indicate as follows:
• a short spike downward indicates that the gaze at that time cannot be
determined by the software.
• a long spike downward indicates that the patient blinked at the time fixation
was checked.
The absence of marks on the graph indicates proper fixation.
Possible problems associated with the gaze tracking system are reflections from the trial lens,
fingerprints on the trial lens, an improperly aligned trial lens holder, an improperly calibrated or
aligned Gaze Tracking box, and excessive patient tearing.
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FIGURE 1-2. Corneal Reflex marker Location Digitized and Stored in Memory
FIGURE 1-2. Corneal Reflex marker Location Digitized and Stored in Memory
FIGURE 1-2. Corneal Reflex marker Location Digitized and Stored in MemoryFIGURE 1-2. Corneal Reflex marker Location Digitized and Stored in Memory
Service Guide
FIGURE 1-1. Location of Corneal Reflex Marker
FIGURE 1-1. Location of Corneal Reflex Marker
FIGURE 1-1. Location of Corneal Reflex MarkerFIGURE 1-1. Location of Corneal Reflex Marker
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FIGURE 1-3. Determining the Pupil Center
FIGURE 1-3. Determining the Pupil Center
FIGURE 1-3. Determining the Pupil CenterFIGURE 1-3. Determining the Pupil Center
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FIGURE 1-4. Patient Fixating –
FIGURE 1-4. Patient Fixating –
FIGURE 1-4. Patient Fixating –FIGURE 1-4. Patient Fixating –
Corneal Reflex Marker and Pupil in
Corneal Reflex Marker and Pupil in
Corneal Reflex Marker and Pupil inCorneal Reflex Marker and Pupil in
Proper Relationship
Proper Relationship
Proper RelationshipProper Relationship
FIGURE 1-6. Gaze Graph
FIGURE 1-6. Gaze Graph
FIGURE 1-6. Gaze GraphFIGURE 1-6. Gaze Graph
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FIGURE 1-5. Patient
FIGURE 1-5. Patient Not
FIGURE 1-5. Patient FIGURE 1-5. Patient
Corneal Reflex Marker and Pupil
Corneal Reflex Marker and Pupil Not
Corneal Reflex Marker and Pupil Corneal Reflex Marker and Pupil
Proper Relationship
Proper Relationship
Proper RelationshipProper Relationship
Not Fixating –
Fixating –
NotNot
Fixating – Fixating –
Not in
NotNot
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1.7.3 Head Tracking / Auto Pupil / Vertex Monitoring
These three features are dependent on the Gaze Tracking system. If Gaze Tracking has
successfully initialized, any of these three features can be utilized.
Head Tracking
The Head Tracking feature is designed to lessen the appearance of a trial lens artifact
image when the patient's eye is off center in relation to the center of the trial lens holder.
The intent is to reduce the possibility of inducing an arc-like defect or ring scotoma in the
patient's field test results.
Head Tracking is active when the trial lens holder is in the up position and Head Tracking
has been set to ON in the setup menu. The Head Tracking feature will track the center of
the eye in relation to the trial lens holder. If the patient's eye moves from the center of
the trial lens holder by more than 3 mm for more than one consecutive sample, the head
tracking feature will gently move the chinrest and headrest to automatically reposition the
patient's eye in the center of the trial lens holder. The tracking will stop if the eye doesn’t
follow the correction. Tracking begins when the test is started. This feature will operate
properly only if the patient properly rests on the chinrest.
Auto Pupil
When the Auto Pupil feature is set to ON in the setup menu, the gaze monitoring system
will determine the size of the patient's pupil to the nearest 0.5 mm at the beginning of
each test (during initialization of gaze tracking), and will automatically enter that
information into the Patient Data information screen, marked Auto (*).
Vertex Monitoring
The Vertex Monitoring feature is designed to lessen the appearance of a trial lens artifact
image when the patient's head moves backwards (away from) the trial lens holder. The
intent is to reduce the possibility of inducing an arc-like defect or ring scotoma in the
patient's field test results. Vertex Monitoring will alert the operator (via a double beep) if
the patient's eye moves more than 7 mm away from its original position for any one
measurement. (The sample rate is once every question.)
Vertex distance measurement is obtained during gaze initialization. During gaze
initialization, the two IR LEDs on the trial lens holder appear as two dots of light on the
corneal surface. (Refer to 1.7.2 Gaze Tracking for a complete description.) The distance
between these two dots will decrease as the head moves away from its original position.
If the distance exceeds the software limits, an alert will sound. The test continues, and a
pop-up window appears allowing the user to reinitialize, continue without reinitializing, or
turn off vertex monitoring.
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1.7.4 HFA II Light Intensity Fundamentals
The HFA II uses a simplified linear intensity calibration system rather than the logarithmic
system used in the HFA I. There is only one detector mounted at the end of the turret. This
detector measures both spot and bowl intensities. The projection lamp voltage is controlled by
software to set maximum stimulus brightness. This means that the lamp can be operated at a
lower voltage when the lamp is new; and as it ages, more voltage is applied in order to
maintain the same level of brightness. This increases lamp life expectancy and reduces power
consumption.
During light intensity calibration, the projection voltage is stored in memory and set as close as
possible to obtain 929 Ft-L or 10,000 asb of light output. The background lights are
fluorescent and the voltage is set as close as possible to obtain 2.92 Ft-L or 31.5 asb. During
calibration, light attenuation is measured at 175 different points on each of the two ND
wedges, and the results are stored in memory. The two ND wedges are used in combination
to obtain the desired brightness of the projected spot. The duration of the spot is 200 ms and
is controlled by the software operating the shutter, located between the projection lamp and
the ND wedges.
During the power-on sequence, the bowl intensity is set to the calibrated value (2.92 Ft-L or
31.5 asb). The brightness detector is then pointed at a black patch located on the inside of the
front cover, the shutter is closed, and a measurement is made by the detector. This establishes
the zero asb reference. Next, the shutter is opened, and a spot projected on the bowl
approximately 35E above center is measured by the detector. This measurement sets the
maximum brightness level (10,000 asb, or 0 dB). These two measurement points determine
the slope of the light from dark to maximum brightness.
If the measured intensity varies from that stored during calibration, the lamp voltage is adjusted
and measured again. This continues until the stored intensity and measured intensity match.
If the voltage is adjusted above 10 V, the test will fail and a projection lamp error message will
appear on the screen. If the test does not fail, ten different points on each ND wedge are
measured and compared with their stored values. If these values deviate more than ±.5 dB
from the stored values, the test will fail and a wedge failure error message will be displayed.
1.8 Peripherals
C Mouse
C Keyboard
C Monitor
C Wireless Printer Device
C Uninterruptible Power Supply (UPS)
C HP LaserJet Printer
C External Floppy Drive
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Peripheral devices may be used with, and purchased for use with, the HFA II. The information
presented in this section is for guidance only. In no way does the information presented here
imply that any peripheral device purchased will operate in conjunction with the HFA II. The
only exception to this statement is if the peripheral device was purchased directly from
Humphrey Systems.
Every effort has been taken to ensure that the HFA II software and hardware are compatible
with the majority of off-the-shelf purchased peripherals described below. However, please be
aware that some may not be. It is the customer's responsibility as a consumer to ensure that
they follow our purchase guidelines and that they resolve any non-operational issues with the
vendor from which they purchased the peripheral device.
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Note - Use and operation of all peripherals described below assume that the HFA
II is equipped with revision A10 or later software. Refer to the User's Guide for
proper use of each peripheral.
C
Mouse
Humphrey Systems does not sell a separate mouse (pointing device) or the required adaptor
for the HFA II. However, when selecting a mouse for use with the HFA II, choose a mouse
and adaptor that meet the following requirements:
C It must be a Microsoft-compatible serial mouse, trackball, or keyboard with
integrated trackball or glidepad.
C Purchase a DB-9 male-to-male gender changer.
C The mouse must be connected to serial port 3 (see Appendix B, Figure B-1 for port
location).
C A keyboard with built in touchpad is available via Humphrey Systems.
The mouse may be used in place of, or in conjunction with, the touch screen and keyboard.
C
Keyboard
Humphrey Systems does provide a keyboard as standard equipment on the high-end HFA II.
This keyboard may also be ordered separately and used on any HFA II model. Should you
decide not to purchase the keyboard from Humphrey Systems, use the following specifications:
C IBM 101 with standard 5-pin DIN plug
The keyboard is used in conjunction with the touch screen.
Keyboards shipped with 750 models are equipped with a touchpad. This keyboard can be
ordered and used with all HFA II models.
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C
Monitors
Humphrey Systems does not sell external monitors for the HFA II. However, when selecting
an external monitor, choose any standard PC monitor that has the following specifications:
C Non-interlaced SVGA (or VGA)
C Minimum 35 KHz capability
C Minimum 640 x 480 pixels
C An interface cable of appropriate length
Please note that a color monitor may be purchased and used; however, it will only display in
black and white.
C
Wireless Printing Device
Humphrey Systems does not sell a wireless printer device (provides wireless connection to the
printer) for the HFA II. However, the appropriate drivers have been added to the software to
enable the AeroComm™ GoPrint™ device to be used with the HFA II and HFA II-compatible
printers. Details on connecting and configuring the GoPrint can be found in the HFA II User's
Guide.
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C
Uninterruptible Power Supply (UPS)
Humphrey Systems does not sell a UPS (provides battery backup during power loss).
However, when selecting a UPS for use with the HFA II, note the following specifications and
recommendations:
C The UPS must have a minimum 450 VA rating.
C It must be dedicated to the HFA II. Do not connect the power table or other devices
into the UPS.
C Recommended model: APC smart UPS 620.
Power backup during power loss will depend on the type of UPS selected. Consult a local
supplier for details.
C
HP LaserJet Printer
Humphrey Systems does not sell HP LaserJet Printers. Refer to Appendix D, Printer Types
and Configuration for details on using the HP LaserJet.
External Floppy Drive
C
An external 5.25" floppy drive is available from Humphrey Systems. The external floppy drive
allows patient data stored on the HFA I 5.25" diskettes to be transferred to the HFA II.
Complete details concerning the external floppy drive are found in Appendix C, Data Transfer.
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1.9 Specifications
HFA II Field Analyzer
Physical Characteristics
Dimensions .................. 23"H x 22.25"W x 19.25"D
(58.4 x 56.5 x 48.9 cm)
Weight ..................... 80 lbs (36.3 kg)
Recommended Room Size ...... 106" x 64" (269.2 x 162.6 cm)
(Ventilation recommended)
Environmental
Operating Temp (ambient) ...... 41 to 95E F
Humidity (ambient)............ 20 – 85%
Heat Generated .............. 1,570 BTU/Hr (460 W)
Electrical
Input Power ................. 100 – 120 V @ 4 A, 60 Hz
HFA II Miscellaneous
Item Yes No Details
Return Ground Connector !
Overcurrent Protection ! Fuses
Hospital Grade Plug !
Leakage to Patient See Compliance Standards and
Dedicated Circuit Required !
Patient Connections ! Not applicable
230 V @ 2 A, 50 Hz
Directives in this section
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