Page 1
Humphrey
Field Analyzer
Series 700
®
COMPANY CONFIDENTIAL
COMPANY CONFIDENTIAL
COMPANY CONFIDENTIALCOMPANY CONFIDENTIAL
Part No. 30122 Rev B
December 2001
Field Service Guide
Page 2
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
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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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General Information Humphrey Field
General InformationGeneral Information
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Notes:
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Analyzer II
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General Information
General InformationGeneral Information
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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General 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
General Information
General InformationGeneral Information
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.
General Information
General InformationGeneral Information
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
General Information
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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.
General Information
General InformationGeneral Information
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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Power Table
Table A = Power Table with a printer mounted beneath the table.
Table B = Power Table without a printer mounted beneath the table.
Physical Characteristics
Table A .................... Top: 35.5"W x 16"D (90.2 x 40.7cm)
Base: 34" W x 29" D (86.4 x 73.7 cm)
Table B ..................... Top 24"W x 14.5"D (61.0 x 36.9cm)
Base: 34" W x 29" D (86.4 x 73.7 cm)
Recommended Room Size ...... 106" x 64" (269.2 x 162.6 cm)
Cycle Height (Table A and Table B)
Low End: ................... 26" (66.1cm)
High End: ................... 40" (101.6 cm)
Power Table Miscellaneous
Item Yes No Details
Return Ground Connector !
Overcurrent Protection ! Fuses
Hospital Grade Plug !
Leakage to Patient See Compliance Standards and
Dedicated Circuit Required !
Directives in this section
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Printrex Printer
Physical Characteristics
Dimensions
Panel-mount printer ........... 4.1" H x 11.9" W x 4.97" D
(10.4 x 30.2 x 12.6 cm)
Stand-alone printer ............ 4.87" H x 12.3" W x 12.0" D
(12.4 x 31.2 x 30.5 cm)
Weight
Panel-mount printer ........... 5 lbs. (2.3 kg)
Stand-alone printer ............ 17 lbs. (7.7 kg)
Environmental
Operating Temp .............. +41 to +104E F (+5 to +40E C)
Storage Temp ................ –40 to +140E F (–40 to +60E C)
Acceleration (Non-operating) .... +3 G, 0 to 50 Hz, 3 axes
Electrical
Power ...................... 350 VA max
Compliance Standards and Directives
The HFA II is classified as a Class II device and complies with the standards and directives
listed below.
As with any product, compliance requirements frequently change and may vary from
country to country. If you do not see the listing that you are looking for, please contact
the Humphrey Technical Support Department for additional information.
C CSA to IEC 601-1-2
C CR 96697
C EMC Directive 89/336/EEC
C MDD Directive 93/42/EEC
Additionally, Humphrey Systems is ISO 9001 certified.
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Section 2 - PM and System Checkout
2.1 System Checkout Checklist .................................. 2 - 3
2.2 Preventive Maintenance Procedure............................ 2 - 9
2.3 Top Filter Replacement .................................... 2 - 11
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2.1 System Checkout Checklist
Following is a copy of the HFA II System Checkout Checklist that should be completed on
every HFA II service call. A master copy of the checklist is included in Appendix I. Use that
master to run additional copies for completing the checkout on each instrument.
If an error is detected during system checkout, troubleshoot and repair the instrument; then
start the system checkout again from the beginning. The entire System Checkout should
always be performed from start to finish. Before attempting system checkout, you should be
thoroughly familiar with navigating around the service menus.
Note
1. Following any calibration procedure that has calibration values stored in the
EEPROM, storage of the new values must be verified by cycling the power off-on
before you perform final system checkout. If values obtained by the HFA II during
calibration are not within an expected range, those values are held only in
temporary storage and not written to the EEPROM. When power is turned off,
these values are erased and calibration reverts to its old status.
2. As part of the system checkout, you are asked to write, read, and delete patient
files from the floppy disk and the hard disk. To prevent accidental damage to
patient files, it is recommended that you make up a test floppy disk with your own
patient data. It is also recommended that you have your own test streamer tape,
should there be a need to service the streamer tape drive.
Reading the Software Revision Levels
One of the steps during system checkout is to read and record the instrument software levels.
Current software levels of the CPU flash memory, Motor Driver flash memory, and system
software are displayed temporarily during HFA II boot-up. They are also displayed during the
loading of software from diskette.
The individual software levels are displayed at separate locations on the screen in the
individual formats shown below in bold italic type, and where nnnnn is an irrelevant number
and XX is the revision level.
CPU flash software ...........................CPU nnnnn.XX
Motor Driver flash software ................ MTR
System software..............................Installation nnnnn.XX
Also displayed temporarily are the RAM memory size, and the instrument model and serial
number, as shown below.
RAM memory size (n) .........................nMb
Instrument model (yyy) and
serial number (zzzzzz) ..........................0yyy-zzzzzz
nnnnn.XX:XX:XX:XX:XX:XX or XX
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Some of the information described above, as well as other instrument configuration data, can
also be found on the HFA II unit configuration screen.
If the HFA II is equipped with A6 or greater software, you can view/print this information
using the following procedures:
For Configuration Data !
• From the Main Menu, select the i icon. The configuration data appears on the
screen.
• Select Print to print out the configuration data.
Reading the Hardware Options Number
Also displayed temporarily during power-up is the hardware options number. The hardware
options number corresponds to the model number of the instrument and is stored in the
instrument's EEPROM. If the hardware options number is set as a model 750, all software
features are enabled. If set for a 740, only those features intended for the 740 are enabled.
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The hardware options number should be verified during the system checkout procedure. The
number is displayed to the right of the instrument serial number, as shown below.
00740-1010 00000000XXXXXX
where XXXXXX is a specific hardware options number. Refer to Appendix G for specific
hardware options numbers.
If the HFA II is equipped with A6 or later software, the hardware options number also appears
on the System Log printout and the Cal/Wedge printout. You can print this information using
the following procedures:
For the System Log!
• From the main menu, select System Setup; then select Print System Log. The
hardware options number and instrument serial number are printed on the line
titled
Machine Id
For the Cal/Wedge printout
• From the Calibration main menu, select Print Cal Values to print out the instrument
calibration data. The hardware options number and instrument serial number are
printed on the line titled
, at the beginning of the printout.
Machine Id
, near the beginning of the printout.
Acquiring Foveal Threshold Values with the Model 720
This test will take approximately three minutes to run.
1) Select the 10-2 test from the Main Menu (or go into Show Test Library, select Threshold,
then 10-2).
2) In the Patient Data screen, enter your birth date, then select Proceed.
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3) When the 10-2 test comes up, select Change Parameters, set Test Strategy to Sita-Fast,
and then press Selection Complete.
4) Start the test. With patient response button in hand, position yourself on the chin rest.
With both eyes open and fixating on the yellow target, complete the test.
5) The test will take about 2 to 3 minutes to complete. When finished, you will hear two
beeps and the test results will be displayed.
6) Select the Print icon and print the results, but do not save them to disk.
7) The four dB numbers nearest fixation (center of field) should be the highest values.
Compare these numbers as you would with the Foveal Threshold values you receive on
Models 730 – 750. Label this printout either Before or After (as required). Save this
printout, as you will return it with your instrument repair paperwork.
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HFA II SYSTEM CHECKOUT CHECKLIST
Your Name: ______________________ HFA II S/N: ____________________
Date: ____________________
NOTE: Following any calibration procedure that has calibration values stored in the
EEPROM , storage of the new values must be verified by cycling the power off-on
before you perform final system checkout. If values obtained by the HFA II during
calibration are not within an expected range, those values are held only in temporary
storage and not written to the Cal/Config Data. When power is turned off, these values
are erased and calibration reverts to its old status.
The HFA II System Checkout Checklist Guidelines —
# Part I — The items described in Part I must be completed for All service calls.
# Part II — The items described in Part II must be completed when any of the following
service conditions apply:
-- Performing an instrument PM
-- Recalibrating either the White/White or Blue/Yellow light intensities
-- Replacing/initializing the Cal/Config Data
-- Cleaning/replacing the brightness detector, ND wedges, or the color wheel
-- Replacing the motor driver PCB
This checklist assumes that all required service has been performed on the HFA II. Place a
checkmark next to each item if okay. If an item does not apply to the HFA II under service,
indicate N/A (not applicable).
Part I -- For All Service Calls (Refer to the above System Checkout Checklist Guidelines.)
1) If a repair has been performed, verify that all required adjustments/checks have
been performed per Table 3-1.
2) Acquire and print the results of your foveal test. Check that the foveal value
obtained is within ±2 dB of your known foveal value.
3) Print the Cal/Wedge printout. Verify that all values are within specification.
(Appendix H)
4) Print the Unit Configuration printout. Verify that all entries are accurate, based on
instrument serial number and model. (Appendix J).
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5) Print the System Log printout and then clear the log. Verify that all reported error
conditions have been evaluated/corrected. (Appendix J)
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Part II
Calibration Checks
6) Verify that the white/white light intensities are within the specified tolerances.
(Attach the required White Light Verification Data printout to this checklist.)
7) Verify that the blue/yellow light intensities are within the specified tolerances.
(Attach the required Blue Yellow Light Verification Data printout to this checklist.)
8) Using the tool stand and fake eye, ensure that the camera is aligned and centered
to the trial lens holder.
9) Using the tool stand and fake eye, verify that the gaze tracking box is within
tolerance.
10) Using the tool stand and fake eye, ensure that all five IR LEDS are functional. Start
a test and initialize gaze tracking. Observe that the three IR LEDs can be seen on
the video image of the fake eye when the trial lens holder is in the down position
(reflex and bowl IR LEDs) and in the up position (reflex and trial lens holder LEDs).
11) Check that the touch screen response is within tolerance. Verify that patient data
can be entered easily and without error.
(Refer to the above System Checkout Checklist Guidelines.)
—
12) Verify that the CRT image is within specified tolerances.
13) Enter Calibration - Verification - Exerciser Tests. Run the 30/60 mixed tests for 5
minutes. No errors should be reported. While the test is running, verify that there
is no shutter noise. Look into the bowl and ensure that there is no shutter
streaking.
Operational Checks
14) Verify that the power table moves up and down and that the table top or slider
slides freely in and out. Ensure that the slider is securely fastened to the table top.
15) Check that the external brightness knob moves freely and has additional brightness
range.
16) Check that the patient chinrest and headrest move smoothly and completely
up/down and left/right. (Noise will be heard at the end of each motor limit.)
—
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17) Observe the bowl for dirt or other cosmetically unacceptable spots. Clean as
needed.
18) Check the operation of the rear fan, and clean the filter
19) Check that the date is correct and the time is within 2 minutes.
20) Select a patient test. Change parameters. Verify that the central fixation LED,
inner diamond, and outer diamond all function.
21) Turn foveal threshold on (except Model 720). Select size III. Start the test. Verify
that the size III spot is in the center of the inner fixation diamond. Ensure that the
spots are sharply focused and no halo is visible. Test the patient button for
operation.
22) Recall a patient test from your test floppy disk. Display and print the test.
23) Recall a test from the hard disk. Display and print the test.
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___ 24) Duplicate a patient test from your test floppy disk to a formatted floppy. Display
the copied test.
25) Copy a patient test from your test floppy disk to the hard drive. Delete that test
from the hard disk.
26) Verify that Tape can be selected as a Source (when setting up for a
Backup / Restore procedure).
27) Turn power off/on and wait for the Main Menu. No errors should be reported.
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2.2 Preventive Maintenance Procedure
For U.S. domestic Field Service, an annual preventive maintenance (PM) visit is required for
every HFA II instrument under service contract. The PM visit can be combined with a regular
service visit if the timing is suitable. The HFA II System Checkout Checklist (Section 2.1) details
the checks and measurements required to complete a PM.
In addition to the System Checkout, the following points should be checked during a PM or
service call.
P Check that all external cable and cord connections are secure.
P Check that the instrument is being powered from a properly grounded AC outlet.
P Observe the ambient conditions in which the instrument is operating:
• Are the cooling vents on the instrument unobstructed?
• Are there any ambient conditions present that may cause static generation
(carpeted floors, dry winter weather, etc.)?
P Check whether the instrument operator(s) have any questions/comments regarding
performance of the instrument.
PM Procedure
1) Obtain the Before instrument data as prescribed on the Light Intensity worksheets detailed
in section 4.8.1.
2) Apply a very thin film of clock oil (P/N 02534) to the projection assembly rails. The
recommended method is to place one drop of oil on your fingertip and lightly wipe it along
the length of the top of the rail. Do this once for each rail.
Caution — Apply the oil sparingly. Excessive oil on the rails will migrate to
other assemblies and cause problems.
After the oil has been applied, proceed to the Motor Exerciser (Section 5) and exercise the
F motor (focus/carriage motor). Exercise the focus motor 20 times to distribute the oil on
the rails.
Check the rail ends and directly beneath the projection assembly for any excess oil.
Carefully wipe up any excess oil.
3) Clean the optics path. Refer to Appendix Q - Cleaning Optics, for general guidelines.
Note that cleaning certain elements in the optics path will affect the light intensity readings
of the instrument, and thus necessitate recalibration.
4) Clean the top and bottom air intake filters, and the power supply fan:
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Bottom Filter — It is recommended that this filter be replaced. However, it can be
cleaned under running water, dried, and then reinstalled, if necessary. Ensure that the filter
is completely dried before reinstalling.
Top Filter — Do Not clean this filter — replace it only. Refer to section 2.3 for special
replacement procedures required.
Projection Filter — (Older systems will not have this filter, See page 7-16). Remove and
clean under running water, dry and reinstall.
Power Supply Fan — Gently brush, vacuum, or blow any accumulated dust and debris
off the power supply fan and surrounding assembly. Use care to avoid getting dust or
debris on the instrument optics or bowl.
5) Clean the bowl (see User's Guide).
6) Check all belts, and replace as required.
7) Update the system software to the latest revision that the customer is entitled to free of
charge.
NOTE: If the unit has a New Motor Board (P/N 48530-3) see Bulletin HFA2 - 053(x).
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8) With the covers still off, perform the System Checkout (2.1).
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2.3 Top Filter Replacement
Note DO NOT attempt to clean this filter — replace it only.
Figure 2-1 shows the two styles of top fan filter that have been used on the HFA II. The early
filter assembly is obsolete and must be replaced by the current filter assembly. (See Section
7.7.3.1 for additional information on various fan styles used on the HFA II).
Note As designed, the new filter assembly can be extremely difficult to install. This is because
the metal retaining ring used to hold the filter assembly together prevents the detent tabs on the
filter housing from flexing when you attempt to press the filter assembly into the HFA II bowl.
Modification of the filter assembly as follows relieves the difficulty in installation.
Modifying the New Filter Assembly
1) Prior to installing the new filter assembly, remove and discard the metal retaining ring and
second plastic ring from the new filter assembly (Fig. 2-1).
2) Seat the first plastic ring and filter foam in the filter housing as shown, and apply 3 or 4
dabs of RTV to hold the foam in place in the housing. Do not apply RTV on the detent
tabs. Allow the RTV to dry before installing the filter assembly into the HFA II.
FIGURE 2-1. Top Fan Filter Assembly
FIGURE 2-1. Top Fan Filter Assembly
FIGURE 2-1. Top Fan Filter AssemblyFIGURE 2-1. Top Fan Filter Assembly
(continued)
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(2.3 Top Filter Replacement - continued)
(2.3 Top Filter Replacement - continued)
(2.3 Top Filter Replacement - continued)(2.3 Top Filter Replacement - continued)
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Early HFA II units — install modified new filter assembly, part number 30199
On early HFA II units the top fan filter was originally secured in place with RTV to prevent it from
hitting the vertical motor on the turret. This filter should be removed and replaced with the filter
housing and filter foam used in current production units. The procedure to do this is described in
the steps below.
Procedure
1) Remove the patient support assembly (front cover assembly) (3.2).
2) Lay a soft cloth or similar material in the bowl of the HFA II. This will keep the bowl clean
when performing the following removal steps.
3) Carefully remove the RTV and old filter assembly, exposing the velcro attached to the bowl.
(In most cases, the RTV can be removed by hand.)
4) Slowly peel off the velcro from around the top fan opening in the bowl. Some paint may
peel off with the velcro — this is acceptable.
5) Check that the foam gaskets directly behind the upper fan opening do not obstruct the
opening.
6) Modify the new filter assembly as described above for ease of installation.
7) Insert the rear tabs on the modified filter into the fan opening first; then press on the front
tabs to snap the filter assembly into place (see Note below).
Note Snapping the filter assembly into place may take more force than one might
expect. Use caution not to excessively flex the bowl.
Newer HFA II units - install modified new filter assembly, part number 30199
1) Remove the patient support assembly (front cover assembly) (3.2).
2) Lay a soft cloth or similar material in the bowl of the HFA II. This will keep the bowl clean
when performing the following removal steps.
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3) Locate the upper fan plenum and the rectangular filter which covers the opening into the
plenum. Remove the filter by:
Older Instruments The filter is held in place by adhesive. Simply grasp the filter and pull down.
Newer Instruments The filter is held in place with two screws secured to the plenum. Remove the two screws.
4) Look into the upper fan plenum and locate the metal retaining ring (Figure 2-1). Use a
small Allen wrench or similar tool to remove the metal retaining ring through the plenum
opening.
5) Use a standard flat screwdriver to push in on the tabs (Figure 2-1) and at the same time pry
the circular upper fan filter assembly away from the bowl.
6) Modify the new filter assembly as previously described for ease of installation.
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7) Insert the rear tabs on the modified filter assembly into the fan opening first; then press on
the front tabs to snap the filter assembly into place (see Note below).
Note Snapping the filter assembly into place may take more force than one might
expect. Use caution to not flex the bowl excessively.
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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
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
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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/New Bowl Identity ................ 58
3.43 Quarter-Turn Fastener Replacement.............................. 59
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Notes:
Notes:
Notes:Notes:
Parts Removal/Replacement
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3.1 General Instructions
P Table 3-1 is the single source of reference for Removal/Adjustment requirements.
Whenever a removal procedure is performed, refer to Table 3-1 to determine
which follow-up checks/adjustments are required.
P System interconnect diagrams for the entire instrument are contained in Section 6.
P In addition to the drawings in this section, the parts drawings in Section 7 provide
useful reference for parts identification and identifying relative locations during
removal/replacement procedures.
P References from one procedure to another are shown in the form "(x.x)."
EXAMPLE: In the CRT Removal/Replacement procedure, one of the steps is to
"Remove the operator panel (3.4)." If you need further details for removing the
operator panel, you can refer to Section 3.4, and then return to the CRT removal
procedure for the next step.
P Simple removals that are clearly obvious are not described in this service guide.
P Unless noted otherwise, the steps for replacement (reassembly) are simply the
reverse order of the steps described for removal and are not listed. Replacement
(reassembly) notes are included as needed.
P All screws and nuts mentioned in the instructions are metric unless noted
otherwise.
P Because the covers interlock with each other, the required sequence for cover
removal is:
1. Front cover
2. Rear cover
3. Operator panel
The covers must be reinstalled in exactly the opposite sequence. Successful
reassembly requires careful attention to the interlocking points on the covers.
P Some of the motor pulleys are installed with the collar outward, and some with the
collar inward (next to the motor body). Be sure to make note of the correct
position of the collar before removing the pulley.
P When reinstalling motor pulleys, ensure that there is proper clearance between the
pulley and motor body. When reinstalling the belt, ensure that the motor belt teeth
are properly meshed with both pulleys.
P The appearance and condition of the bowl's inner surface are critical to the
functionality of the HFA II; work carefully to avoid damaging or dirtying the bowl.
Do not touch the inside of the bowl unnecessarily.
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P In this service guide, the terms left, right, front and back of the instrument are as
viewed from the patient position, unless noted otherwise.
P Whenever you will be working on the projection assembly with it installed in the
instrument, place a sheet of paper or clean cloth under the projection assembly to
catch any small hardware that you may drop.
P Some of the cable connectors in the instrument may not be keyed. To facilitate
later reassembly of the instrument, consider labeling each connector during
disassembly.
P Proper cable and wire routing is important. Before disassembly, observe the cable
routing and locations of the cable ties; then be sure to route the cables exactly the
same during reassembly. Be sure to replace all cable ties removed during
disassembly.
P Be sure to reconnect all ground wires disconnected during disassembly. Failure
to do so can cause the instrument to malfunction.
P Certain screws on the projection assembly secure critical alignment of the optical
path. It is essential that you NOT LOOSEN these screws (see Figure 3-1).
Alignment of the projection assembly can only be done at the factory using special
equipment.
P After replacement of parts or an assembly, perform a limited operational check of
the associated functions before complete reassembly of the instrument. After
complete reassembly, perform the full System Checkout (Section 2).
3.1.1 Bowl Identification
Throughout this manual, references are made to the Old Bowl and New Bowl.
Determine whether the instrument is equipped with the OLD BOWL or the NEW
BOWL, then follow the appropriate procedure.
The new bowl assembly can be identified by the location of the Reflex LED, just below
the Large Fixation Diamond (moved from the left of the Central Fixation LED as in the
Old Bowl).
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Caution — It is essential that you use proper ElectroStatic Discharge
(ESD) precautions when disassembling or handling the instrument
circuitry or circuit boards. Many components in the instrument are highly
susceptible to static discharge damage. The Field Service Static Protection
Kit, described in Appendix A, must be used for ESD protection during
service of the instrument.
FIGURE 3-1. Screws Securing Projection Assembly Alignment
Special Tools / Equipment
Any special tools or equipment required for a procedure are listed at the beginning of
the procedure.
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TABLE 3-1
Adjustment / Check Requirements Following Replacements
This table identifies checks/adjustments that must be made following removal/ replacement
procedures. The numbers listed under Follow-ups Required are keyed to the Follow-up
Actions listed on the facing page. For each Assembly Replaced, the follow-up numbers are
listed in the order in which they should be performed, not necessarily in numerical sequence.
Items marked with an asterisk (*) only need to be performed if the assembly is actually being
replaced, not just removed and reinstalled. All other items need to be performed whether the
assembly is replaced, or simply removed and reinstalled. Superscript numbers
to the Notes on the facing page.
(1)
in the table refer
Assembly Replaced Follow-ups Required
•Projection Lamp1.........3, 8, 10, 9, 19, 21, 22,23, 40
• Front Cover Assy .........40
• Rear Cover Assy..........40
• Operator Panel Assy.......40
• Drive Housing Assy .......40
• CPU PCB ...............27, 29, 40
EEPROM ...............26, 27, 28, 29, 7, 8, 3, 10,
9, 12, 11, 13, 16, 17, 15,
18,19, 20, 21, 22, 23, 40
• Backplane ..............7 40
• Flash Prom..............29, 40
• Motor Driver PCB ........29,18, 19, 20, 21, 22, 23,
16,17, 40
• Power Supply ...........40
• CRT PCB ...............2*, 7*, 40
• CRT ...................2*, 7, 40
• Touch Screen ............7, 40
• Fixation Interconnect PCB . . 40
• CCD Camera ...........14, 5, 16, 17, 40
• Central Fixation LED Assy . . 14, 5, 16, 17, 40
• Projection Assy ...........8*, 3*, 10*, 9*, 12*, 11, 13,
19*, 21*, 22*, 23*,40
• Projection Interconnect PCB 40
• Film Wedge/Motor ........8, 22*, 23*, 40
• Glass Wedge/Motor .......8, 22*, 23*, 40
• Color Wheel /
Aperture Wheel ..........10, 9, 11, 13, 19*, 21*
• Carriage Focus Motor......24, 11, 13, 40
• Shutter .................8, 40
• Shutter Motor ...........8, 11, 13, 40
3
, 40
Assembly Replaced Follow-ups Required
• Carriage Focus Motor Belt . . 24, 40
• Horizontal (X-axis)
Turret Motor.............24, 11, 13, 40
• Horizontal (X-axis)
Turret Motor Belt .........24, 11, 13, 40
•Vertical (Y-axis)
Turret Belt/Motor .........24, 11, 13, 40
• Brightness Detector (PCB)
Green Filter
Blue Filter...............4, 11, 13, 18*, 19*, 20*,
21*, 22*, 23*, 40
• Lower Turret ............24, 11, 13, 40
• Turret Cable Assy.........11, 13, 40
•Chinrest/Headrest
Switch Assy .............40
• Chinrest Y-axis Belt/Motor . . 24, 40
• Patient Support Horizontal
(X-axis) Belt/Motor ........24, 40
•Chinrest Vertical
Slide and Lead Screw......24, 40
• Chinrest Horizontal Slide . . . 24, 40
• Trial Lens Holder Assy .....5, 16, 17, 15, 40
• Top Fan ................40
• Bowl IR LED Assy ........6, 15, 40
• Blue-Yellow
Module / Bowl Plug .......11, 13, 20*, 40
• Bowl ..................11, 13, 5, 6*, 16, 17, 15*,
18*, 19*, 20*, 21*,22*,
23*, 40
• Reflex Gaze LED .........5, 16, 17, 15, 11, 13, 40
• Bowl Lamp Assy .........18, 11
• IR Bowl Plug ............40
4
, 134, 40
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1 - Obtain Before and After Light Intensity and Calibration
Values (4.8.1)
2 - CRT Adjustments (4.9.5)
3 - Lamp Filament Position Adjustment (4.8.2.1)
4 - Detector Position Adjustment (4.8.2.8)
5 - Trial Lens Holder Alignment (4.9.6)
6 - Bowl IR LED / Cold Mirror Adjustment (4.9.8)
7 - Touch Screen Calibration (4.9.4)
8 - Shutter Calibration (4.8.2.2)
9 - Aperture I - V Calibration (4.8.2.3)
10 - Color Wheel Calibration (4.8.2.4)
11 - Left/Right Home Position Calibration (4.8.2.5)
12 - Focus Calibration (4.8.2.7)
13 - Offset Fixation Calibration (4.8.2.6)
14 - Camera Focus (4.9.7)
15 - Camera Intensity Calibration (4.8.6.3)
16 - Camera Position/Size Calibration (4.8.6.1)
17 - Gaze Monitor Position/Size Calibration (4.8.6.2)
18 - White Bowl Intensity Calibration (4.8.3.2.1)
19 - White Projector Intensity Calibration (4.8.3.1.1)
20 - Yellow Bowl Intensity Calibration (4.8.3.2.2)
21 - Blue Projector Intensity Calibration (4.8.3.1.2)
22 - Wedge Calibration (4.8.3.3)
23 - Blue Correction (4.8.3.4)
24 - Belt Tension Adjustment (4.9.2)
25 - Patient Support Horizontal Leadscrew Adj. (4.9.1)
26 - Transfer Calibration Constants (App. G.1)
27 - ID CPU (App. G.2)
28 - Configure Hardware (App. G.3)
29 - Reload Software (App.C)
40 - System Checkout (2.1)
NOTES -
1. Adjustment/calibration not required when projection
lamp is replaced by customer.
2. Only blue calibration required if color wheel is
replaced. Both white and blue projector calibration
required if aperture wheel is replaced.
3. For Bowl Lamp Replacement, actions 11 and 13 are
required only if projection assy had to be removed for
replacement of bowl lamp(s) equipped with early style
baffles.
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3.1.2 Removal of the HFA II from the Power Table
A number of parts removal and procedures will require that the HFA II instrument be
removed from the power table top prior to accomplishing further removals and assemblies.
There are currently four variations of power tables used with the HFA II:
P Power Table I - This Power Table did not secure the HFA II to the table top.
P Power Table II - Some of the Power Table IIs allowed the instrument to be secured to
the power table top.
P HPT3 - The HPT3 has a sliding device mounted to the table top that also secures the
HFA II.
P HPT4 - The HPT4 table has the same slider arrangement that secures the HFA II to the
table as the HPT3.
Power Table 1 -
The HFA II is not secured to the power table top.
Power Table 2 -
1. Lower the power table to its lowest position.
2. Remove the (4) screws securing the instrument to the power table from
underneath.
Power Table (HPT) 3 and 4 -
1) Remove the patient switch jack from the patient switch connector, located on the
bottom left of the disk drive panel.
2) Lower the power table to its lowest position.
3) Remove the three screws that secure the cover plate to the rear of the slider
assembly. (Removal instructions are provided at the backside of the cover plate.)
4) Remove the cover plate.
5) Pull the slider handle out and position the slider assembly such that the hole in
line with the rail on the left side of the slider (as seen from the front of the HFA II)
aligns with the hole in the left rear HFA II foot.
6) Loosen and remove the screw securing the left rear foot of the HFA II.
7) Position the HFA II such that the patient side of the slider is just beyond an inch
(2.54 cm) from the edge of the table top. Do not move the slider assembly
beyond this position.
8) Loosen, but do not fully remove, the captive screw securing the front right foot of
the HFA II. Access to the screw is from the hole on the bottom of the slider
assembly.
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REMOVAL FROM TABLE
3.2 Front Cover Assembly Removal
NOTE - As described below, the front cover assembly must first be partially removed to allow
an internal cable and ground wire to be disconnected (step 3) before the cover can be removed
completely.
1) Loosen the two captive 1/4-turn fasteners located along the bottom front of the front
cover assembly or remove the 10-32 X .875" Phillips pan head screws and caged nuts
found in place of some the captive 1/4-turn fasteners (see HFA2-041).
2) Pull the bottom of the front cover assembly out slightly; then gradually lift up on the
front cover assembly while pulling out from the top. This will free the front cover
assembly from the rest of the instrument.
3) While holding onto the front cover assembly, disconnect the ribbon cable from the
Patient Support Interconnect PCB and disconnect the ground wire from the chassis.
4) Remove the front cover assembly from the instrument.
Replacement Notes:
P Do not over tighten the 1/4-turn fasteners.
P Be sure to reconnect the ground wire to the chassis and the ribbon cable to the Patient
Support Interconnect PCB before attaching the front cover assembly. Guide the cover
on carefully to avoid pinching the ground wire or the forehead rest drive belt between
cover and chassis.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.3 Rear Cover Assembly Removal
1) Remove the front cover assembly (3.2).
2) Remove the projection lamp access cover.
3) Remove the fan filter door completely (to avoid interference during rear cover
removal).
4) Remove the cables and cords from connector on the back panel.
5) Loosen the two captive 1/4-turn fasteners located near the top of the rear cover assembly
(Note some instruments may have 10-32 X .875" Phillips pan head screws and caged 1032 nuts in place of the 1/4-turn fasteners. You must remove the Phillips screws
completely for the rear cover assembly removal (See HFA2-041).
6) Remove the two screws that were exposed by removing the fan filter door.
7) Remove the three screws located along the bottom and side of the rear cover assembly.
Caution — While the cover assembly is being manipulated in the next
step, be very careful to avoid damaging the neutral density wedges which
are located very close to the top of the cover. The projection lamp cable
and the heatsink on the CRT PCB also are very close to the cover.
8) Pull the rear cover assembly part way out, disconnect the fan connector, and then
remove the rear cover assembly.
Replacement Notes:
P Remember to reconnect the fan before reinstalling the rear cover.
P Work carefully to avoid damaging the projection assembly by contact with the cover
assembly.
P Be careful of the routing of various cables to prevent them from being damaged by being
pinched between the rear cover assembly and the frame.
P After the unit is reassembled and power is applied, check that the fan is operating.
P Ensure that the Brightness Potentiometer knob moves freely.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.4 Operator Panel Assembly Removal
1) Remove the front cover assembly (3.2).
2) Remove the rear cover assembly (3.3).
3) Remove the patient button assembly from the disk drives panel .
4) Remove the drive housing assembly (3.5).
5) Disconnect:
P The large edge connector on the CRT PCB;
P The brightness control potentiometer connector;
P The chinrest switch flex-cable connector from the Motor Driver PCB or the chinrest
filter circuit.
The connector is identified as P12 on the 29360-1 and 29360-3 Motor Driver PCB,
if it is not equipped with the chinrest filter circuit. If the 29360-1 and 29360-3
Motor Driver PCB motor board is equipped with the chinrest circuit, the connector
is removed from the P1 connector on the chinrest filter circuit. For the 46120-1
and 46120-3 Motor Driver PCB, the connector is removed from the P5 connector.
(See Service Bulletin HFA2 - 035(x) for additional information).
P The touch screen ribbon cable from connector JTS on the CPU PCB.
NOTE - In early units, there is also a connector in the touch screen cable along the
left side of the CRT. DO NOT attempt to separate this connector, as it is held together
by an adhesive-backed reinforcer. If you attempt to remove the reinforcer, there is a
strong possibility that you will damage the connector and have to replace the cable
and/or touch screen. Instead, just unfasten the touch screen interconnect cable from
any cable clips holding it to the instrument chassis, and allow the cable to remain with
the operator panel.
6) Remove the disk/tape drive ribbon cables from their clip(s) on the inside of the operator
panel assembly.
7) Remove the two screws located at the two bottom corners on the backside of the
operator panel assembly (Figure 3-2). These two screws secure the bottom of the
operator panel to the instrument chassis.
8) Loosen the two captive screws, behind the top of the CRT, which are securing the CRT
PCB support bracket to the instrument chassis. (Hold onto the operator panel assembly
as you loosen the screws, to prevent it from falling.)
9) Remove the operator panel assembly by manipulating it up slightly and to the left while
pulling straight out.
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FIGURE 3-2. Operator Panel Bottom Mounting Screws
Replacement Notes:
P Be sure to slide the ribbon cables back into their clips.
P Make sure that the patient response button connector module is mounted in the bottom
pan, with its contacts positioned upward, before you reinstall the operator panel
assembly.
P For units equipped with early touch screens, it is recommended that you carry a spare
touch screen interconnect cable, P/N 29616. In these units, the touch screen connector
along the left side of the CRT is secured by an adhesive-backed reinforcer. If you ever
need to separate this connector, there is a strong possibility that you will damage the
connector and need to replace the touch screen.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.5 Drive Housing Assembly Removal
1) Remove the patient switch jack from the patient switch connector located on the bottom
left of the disk drive panel.
2) Lower the power table to its lowest position.
3) Perform step 3) or step 4) as required.
P Using both hands, place your fingers along the bottom edge of the drive housing
front panel.
P Attempt to pull both outward and upward to remove the panel. If the panel can be
removed in this manner, proceed to step 5) below.
4) Remove the front panel from around the drive housing assembly in the following
manner:
Caution — This step must be performed carefully to avoid possible
damage to the circuit board on the bottom drive. Refer to Preparing the
HFA II to Remove the Disk Drive Panel Assembly on the following page.
a) From below the instrument, insert a small diameter tool (such as a hex ball driver —
preferably with handle) straight up through the small hole located in the bottom of
the instrument, approximately 1.75" back from the front edge of the bezel (Figure
3-3). Insert the tool until it touches the plastic tab securing the bottom edge of the
bezel.
Caution — If the tool is inserted with the tip tilted rearward, it may
contact and damage the bottom drive circuit board.
To unlatch the bezel, push the tip of the tool against the latch as you move the
handle of the tool rearward (Figure 3-3).
b) Pull out on the bottom edge of the drive bezel until it separates from the operator
panel.
5) Remove the three screws (two at the top, one at the bottom) that hold the drive housing
assembly in place.
6) Pull the drive housing assembly straight out until the cable connections at the back are
accessible.
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7) Disconnect the cables and power connectors from the drives.
Preparing the HFA II to Remove the Disk Drive Panel Assembly
Caution — With HFA II Power Tables it may be necessary in the
procedure to position the HFA II such that it overhangs the center of
gravity of the table top. Hold the instrument securely with one hand at
all times to prevent it from falling. For the Power Table I: DO NOT
move the instrument to the operator end of the table. The table is designed
to carry the weight of the instrument in the area away from the operator
end of the table.
Most HFA II power tables may have an access hole that allows access to
release the latch securing the disk drive panel without unfastening the
instrument from the table top. The HPT3 and HPT4 tables may have
access to the rear support screw .
NOTE - There are currently four variations of power tables used with the HFA II. The first is the
Power Table I (100). This Power Table has a 3 position sliding top and was not available with a
Printrex printer. The second Power Table is the Power Table 2 (200). It came with a sliding top
and was available with or without a printer. The third type of Power Table is the HPT3 (300),
which does not have a sliding table top and was available with or without a printer. The HPT3 has
a three stage lift mechanism. The fourth type is the HPT4(400), table is nearly identical to the
HPT3 with the exception that the lift mechanism is a two stage type. Refer to Section 7 for Power
Table illustrations.
Power Table 1 (HPT 100)
1) Remove the patient switch jack from the patient switch connector located on the bottom
left of the disk drive panel.
2) Lower the power table to its lowest position and lock the table top into its center position.
(Look for the gate latch beneath the table).
3) Rotate the instrument 90E and carefully position it so that the operator panel side of the
HFA II overhangs the edge of the table top slightly (but not near the operator end of the
table).
Power Table 2 (HPT 200)
NOTE - Some Power Table Type 2 may have an access hole in the table top that will allow
removal of the disk drive panel without removing the HFA II from the table.
1) Remove the patient switch jack from the patient switch connector located on the bottom
left of the disk drive panel.
2) Lower the power table to its lowest position.
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3) Remove the (4) screws securing the instrument to the power table from underneath the
table top.
4) Rotate the instrument 90E and carefully position it so that the operator panel side of the
HFA II overhangs the edge of the table top slightly (but not near the operator end of the
table).
Power Table 3 (HPT300)
1) Remove the patient switch jack from the patient switch connector located on the bottom
left of the disk drive panel.
2) Lower the power table to its lowest position.
3) Remove the three screws that secure the cover plate to the rear of the slider assembly.
4) Remove the cover plate.
5) Pull the slider handle out and position the slider assembly such that the hole in line with
the rail on the left side of the slider (as seen from the front of the HFA II), aligns with the
hole in the left rear HFA II foot.
6) Loosen and remove the screw securing the left rear foot of the HFA II.
7) Position the HFA II such that front end of the slider is just beyond an inch (2.54 cm) from
the edge of the table top. Do not move the slider assembly beyond this position.
8) Loosen, but do not fully remove, the captive screw securing the front right foot of the
HFA II. Access to the screw is from the hole on the bottom of the slider assembly.
Power Table 4 (HPT 400)
1) Remove the patient switch jack from the patient switch connector located on the bottom
left of the disk drive panel.
2) Lower the power table to its lowest position.
3) If the table top has an access hole to the disk drive panel latch, go to step 3. If the table
top has no access hole, proceed as follows:
a) Remove the screws securing the instrument to the power table.
b) Rotate the instrument 90E and carefully position it so that the right side (the CRT
side) overhangs the edge of the table top slightly (but not near the operator end of
the table).
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FIGURE 3-3. Unlatching the Drive Housing Bezel
Replacement Notes:
P Before installing a new drive, verify that it is strapped correctly (Refer to Field Service
Bulletin HFA2-003x.)
P Reconnect the cables to the drives before reinstalling the drive housing assembly.
P Replacement hard disks are preformatted. You will need to load the system software.
You may need to restore the configuration data. Notify the customer that they will have
to restore patient data (models 735/740/745/750).
P If it becomes necessary to reformat a hard drive, refer to Appendix L for instructions.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.6 CPU PCB Removal
1) Remove the front cover assembly (3.2).
2) Remove the rear cover assembly (3.3).
3) Disconnect the seven cables attached to the front side of the CPU PCB.
4) Remove the eleven screws securing the CPU PCB to the chassis.
5) Pull the CPU PCB out and disconnect the two cables attached to the back of the board.
6) Remove the CPU PCB.
Replacement Notes:
P Reconnect the two cables to the back of the CPU PCB before reinstalling it.
P If you are installing a replacement CPU PCB in the instrument, perform the following
steps:
P Transfer the metal connector plate from the old board to the new board.
P Transfer the EEPROM (cal data) found at location U81 on the 29320-5 CPU PCB,
U-56 on the 30470 CPU PCB or at U57 on the 48440 CPU PCB to the new
board.
P Perform the CPU PCB Identification Procedure (see Appendix G).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.7 Motor Driver PCB Removal
1) Remove the front cover assembly (3.2).
2) Remove the rear cover assembly (3.3).
3) Remove all but the top three mounting screws securing the CPU PCB to the chassis.
4) Disconnect the large ribbon cable at the upper right corner of the CPU PCB.
5) Slightly loosen the screw that attaches the left end of the top CPU mounting bracket to
the chassis.
6) Remove the screw that secures the right end of the CPU mounting bracket to the chassis.
7) Gently swing the right side of the CPU outward while guiding the cables at the bottom
rear of the CPU PCB out through their access holes.
8) Disconnect all cables attached to the Motor Driver PCB (don't forget the one attached to
the back of the board).
9) Remove the chinrest filter circuit if the instrument is so equipped.
10) Remove the seven screws securing the Motor Driver PCB to the chassis.
11) Remove the Motor Driver PCB.
Replacement Notes:
P Reconnect the cable to the back of the Motor Driver PCB before reinstalling the PCB.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.8 Power Supply Removal
Caution — On Instruments with the old power supply, it may be
necessary in one of the steps of this procedure to unfasten the instrument
from the power table. Hold the instrument securely with one hand at all
times to prevent it from falling. DO NOT move the instrument to the
operator end of the table. The table is designed to carry the weight of the
instrument in the area away from the operator end of the table.
1) Lower the power table to its lowest position, depending on the table type, either lock the
table top in its center position or the slider to its rear - most position.
2) Remove the front cover assembly (3.2).
3) Remove the rear cover assembly (3.3).
NOTE - If the power supply has a cover (slotted or solid) it is the new - style power supply.
4) See Bulletin HFA2 - 043(x) if changing Power Supply styles.
5) Remove the patient button.
6) Ensure that the power cord is disconnected.
7) Disconnect the cable from P10 on the Motor Driver PCB.
Old Power Supply
8) Remove the two screws securing the instrument to the table top or slider.
9) While holding the instrument securely with one hand, tilt it towards its CRT side far
enough to expose the 4 screws that mount the power supply assembly to the instrument
chassis. The instrument can be carefully laid on the table to ease screw removal.
10) Disconnect the power supply fan connector.
11) Remove the four screws securing the power supply assembly.
12) Carefully lower the instrument to the upright position.
New Power Supply
13) Remove the two screws securing the Power Supply Assembly.
14) Lift the connector end of the power supply and carefully maneuver the power supply out
of the side opening in the chassis. (Watch out for the Fixation Interconnect PCB
mounted on the bowl.)
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15) Disconnect the two large connectors from the power supply.
16) With a screwdriver, unfasten the two AC supply lines and ground wire attached to the
power supply. Note the order of these connections.
17) Remove the power supply.
Replacement Notes:
P Reconnect the three input wires before reinstalling the power supply assembly.
P Loosely install all of the four mounting screws before tightening them.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.9 CRT PCB Removal
1) Remove the operator panel assembly (3.4).
2) Carefully discharge the CRT high voltage to ground and disconnect the high voltage lead
from the CRT.
3) Disconnect:
P the yoke connectors (3 in Kristel, 1 in Z-Axis) from the CRT PCB.
P the connector on the end of the CRT neck.
4) Release and remove the CRT PCB from its four plastic standoffs.
Replacement Notes:
P The CRT anode lead must be routed over the top of the CRT neck. If the lead passes
under the neck of the CRT, it lays next to the bowl and the electrostatic field around the
lead will attract dust to the inside of the bowl.
P If installing a new CRT (tube only) see Service Bulletin HFA II - 029(x) and
HFA II - 070(x).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.10 CRT Removal
1) Remove the operator panel (3.4).
2) Carefully discharge the CRT high voltage to ground and disconnect the high voltage lead
from the CRT.
3) Disconnect:
P the yoke connectors from the CRT PCB.
P the connector at the end of the CRT neck.
4) Remove the screw (item 1, Figure 3-4) at each corner of the CRT bracket.
5) Remove the CRT assembly from the operator panel.
6) Remove the four screws (item 2, Figure 3-4) securing the CRT to the bracket. Be careful
not to lose the washers, and make note of how many washers are used on each screw.
(The washers adjust the mounted position of the CRT.)
Replacement Notes:
P If installing a new CRT (tube only) see Service Bulletins HFA II - 029(x) and 070(x).
P Anytime the CRT or touch screen is disassembled from the foam gaskets, the CRT and
touch screen viewing surfaces should be carefully cleaned before reassembly.
P Ensure that the foam gaskets for the CRT and touch screen are sealing properly, with no
gaps between them.
P Tighten the CRT mounting screws enough to compress the foam gaskets slightly for a
good seal but DO NOT OVERTIGHTEN. If the gaskets are overcompressed, the touch
screen surface will be pressed against the operator panel bezel and the instrument will
malfunction.
Check for adequate clearance by sliding the edge of a business card between the touch
screen surface and the edge of the bezel along the entire perimeter of the bezel. If
necessary, loosen the two top CRT mounting screws slightly to obtain adequate
clearance.
P Be sure that all of the washers (spacers) are in place on the mounting screws before
securing the CRT to the bracket.
P The CRT must be mounted with its anode connector downward.
P The CRT anode lead must be routed over the top of the CRT neck. If the lead passes
under the neck of the CRT, it lays next to the bowl and the electrostatic field around the
lead will attract dust to the inside of the bowl.
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P The connector at the end of the CRT neck is not keyed, so be careful to get it on
correctly. The key-notch in the connector should be located in the gap between pins 1
and 7 on the tube.
Follow-up Checks/Adjustments:
See Table 3-1.
Note — Early touch screens (shown here) are equipped with a short cable that emerges from the left side of the touch screen and
*
plugs into an interconnecting cable. Later touch screens have a longer cable which emerges from the right side of the
touch screen and plugs directly into the CPU PCB.
FIGURE 3-4. CRT / Touch Screen Removal
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3.11 Touch Screen Removal
1) Remove the operator panel (3.4).
2) Carefully discharge the CRT high voltage to ground.
3) Remove the screw (item 1, Figure 3-4) at each corner of the CRT bracket.
4) Remove the CRT assembly from the operator panel.
5) Remove the two screws (item 3, Figure 3-4) holding the touch screen bracket and
remove the bracket.
6) Remove the touch screen.
Replacement Notes:
P Anytime the CRT or touch screen is disassembled from the foam gaskets, the CRT
and touch screen viewing surfaces should be carefully cleaned before reassembly.
P Make sure that the touch surface is facing outward when mounting the touch
screen. (The touch surface is a thin film laminated to one side of a glass plate.
This is easily observed by looking at the point where the flex cable exits the touch
screen.)
P Ensure that the foam gaskets for the CRT and touch screen are sealing properly,
with no gaps.
P The CRT anode lead must be routed over the top of the CRT neck. If the lead
passes under the neck, it lays next to the bowl and the electrostatic field around the
lead will attract dust to the inside of the bowl.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.12 Fixation Interconnect PCB Removal
1) Remove the front cover assembly (3.2).
2) Remove the rear cover assembly (3.3).
3) Rotate the CPU PCB outward in the following manner:
a) Remove all except the top three mounting screws securing the CPU PCB to
the chassis.
b) Disconnect the large ribbon cable at the upper right corner of the CPU PCB.
c) Slightly loosen the screw that attaches the left end of the top CPU mounting
bracket to the chassis.
d) Remove the screw that secures the right end of the CPU mounting bracket to
the chassis.
e) Gently swing the right side of the CPU outward while guiding the cables at
the bottom rear of the CPU PCB out through their access holes.
4) Remove the two screws securing the access panel exposed by moving the CPU
PCB.
5) Remove the cables connected to the Fixation Interconnect PCB.
NOTE: See Bowl Identification (3.1.1) and follow the appropriate procedure.
New Bowl
6) Loosen the three captive screws securing the PCB to the bowl assembly.
7) Press the tabs outward on each side of the PCB to release it from the Camera
mount.
8) Remove the Central Fixation LED from the Camera Mount by gently pressing
down on the holding tab with a small allen wrench, while pulling out the LED by
the cable. When re-inserting the LED, you must line up the notch on the LED with
the flat portion of the holder. You will hear a click when the LED moves into
position.
9) Loosen the M4 screw at the top of the Camera Mount and remove the two M4
screws at the bottom. If the bowl is still in the instrument, the camera will need to
be removed to access the top screw.
10) Maneuver the Reflex LED holder through the opening in the Camera Mount.
Old Bowl
6) Loosen the three captive screws securing the PCB to the bowl assembly.
7) Remove the Fixation Interconnect PCB.
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Replacement Notes:
Be careful of the routing of various cables to prevent them from being damaged by
pinching between the chassis and the assembly.
Follow-up Checks/Adjustments:
See Table 3-1.
3.13 CCD Camera Removal
This notes below provide a brief overview of the changes that have occurred to the
instrument’s CCD camera, and includes the latest calibration changes (position, size, and
intensity) as reflected in revision A10 software.
Overview
Camera #1, # 2, and #3 are all the same camera model. They vary only in how they have
been equipped with lens and/or metal enclosure. The new camera is a completely different
model.
# New Camera (P/N 47117)
The new camera does not require an enclosure to meet CE certification. It may be used as a
replacement for all other camera types. Order ONLY the new camera for repair/replacement.
Notes: 1) The new camera can only be used with software revisions A8.02 or greater.
2) The new camera comes equipped with a lens. This lens must remain on the
camera or proper image calibration will not be obtained.
Cut-in for the new camera is as follows: 720-3248, 740-3041, 745-1543, 750-4552
# Camera #1 (obsolete)
This was the first HFA II camera, and was used on models 720, 730, 740, and 750. The
camera calibration process was identical for all models.
# Camera #2 (obsolete)
This camera was only used on models 720, 730, and 735. Customers indicated that the
image quality on HFA II models 720 and 730 was grainy and lacked high resolution. (Models
740, 745, and 750 use and IR source rather than white light to illuminate the CCD array.)
With the release of model 735, a lens with a larger aperture was added to the camera. The
lens change allowed more white light to illuminate the CCD array. Two camera part numbers
and two calibration procedures were required.
# Camera #3 (obsolete)
The only change to this camera was the addition of a metal enclosure which housed the
camera electronics. The enclosure was designed to reduce electromagnetic emissions.
Procedure - All Cameras
1) Remove the front cover assembly (3.2).
2) Remove the rear cover assembly (3.3).
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3) Rotate the CPU PCB outward in the following manner:
NOTE: If present (camera # 3), beware of the brass grounding strap, it is very sharp.
a) Remove all except the top three mounting screws securing the CPU PCB to
the chassis.
b) Disconnect the large ribbon cable at the upper right corner of the CPU PCB.
c) Slightly loosen the screw that attaches the left end of the top CPU mounting
bracket to the chassis.
d) Remove the screw that secures the right end of the CPU mounting bracket to
the chassis.
e) Gently swing the right side of the CPU outward while guiding the cables at
the bottom rear of the CPU PCB out through their access holes.
4) Remove the two screws securing the access panel exposed by moving the CPU
PCB.
5) Disconnect the camera cable from the lower-left corner of the Motor Board.
NOTE: See Bowl Identification (3.1.1) and follow the appropriate procedure.
Old Bowl
6) Disconnect the “Central Fixation” cable from the Fixation Interconnect PCB.
7) Make note of the lens setting for reference during reassembly.
8) Remove the two screws securing the CCD camera.
9) Carefully remove the camera through the side of the instrument.
New Bowl
6) Make note of the lens setting for reference during reassembly.
7) Remove the two screws securing the CCD camera.
8) Carefully remove the camera through the side of the instrument.
Replacement Notes:
1) Screw the central fixation LED assembly, removed from the old camera, into the
new camera. (Old bowl only.)
2) Before installing the camera, adjust the lens to the setting noted during camera
removal, but
DO NOT
secure the lens in position yet with RTV. (If the original
setting was not noted, or if a new camera is being installed, set the mark on the
lens to align with number 2.) When the HFA II has been reassembled to the point
where it can be operated, check/adjust and secure the camera focus as described
in 4.9.7, Camera Focus.
P Make sure that the upper-left mounting screw is seated all the way to the bottom of
the slot in the camera bracket before tightening the screw. (Old camera only.)
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P Make sure that the ground wire from the CCD camera is connected to the screw at
the left end of the mounting bracket. (Old camera only.)
Follow-up Checks/Adjustments:
See Table 3-1.
3.14 Central Fixation LED Assembly Removal
Old Bowl
1) Remove the CCD camera (3.13).
2) Unscrew the Fixation LED assembly from the camera lens.
Replacement Notes:
P Before reassembly, check that there is no debris, smudges, or dust on the Fixation
LED assembly optics or on the camera lens.
P Make sure you are installing the correct Fixation LED: 720/730/735 version or
740/745/750 version.
P Refer also to the camera replacement notes in Section 3.13.
New Bowl
The New Bowl has been re-designed to incorporate the Reflex LED and the
Central Fixation LED. Therefore, to replace the Central Fixation LED or the Reflex
LED, the entire Fixation PCB must be exchanged. Refer to Fixation PCB removal
notes in Section 3.12.
Follow-up Checks/Adjustments:
See Table 3-1.
3.15 Projection Assembly Removal
Caution — The aperture wheel and ND wedges on the projection
assembly are delicate and easily damaged — work carefully! Any
fingerprints or contamination on the optical area of the film wedge may
necessitate replacement of the wedge; it cannot be cleaned, other than to
blow off any dust.
1) Remove the front and rear covers (3.2, 3.3)
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2) Remove the screw holding the finger guard/baffle plate just behind the film wedge
(Figure 3-5). Easiest access to the screw is through the hole in the film wedge.
3) Disconnect the cable from the projection lamp.
4) Disconnect the two ribbon cables from P1 and P3 of the Projector Interconnect
PCB.
5) Loosen the chassis-mounted, quarter-turn fastener that secures the projection
assembly at its end closest to the CPU PCB.
FIGURE 3-5. Removing the Finger Guard/Baffle Plate
6) Remove the two screws located at the top front of the bowl assembly.
• Remove the Yellow Lamp assembly.
8) Rotate the turret assembly to position the turret Y-motor towards the front.
9) Move the aperture wheel/color wheel carriage all the way forward, towards the first
projection mirror.
NOTE - Before proceeding with the next step, ensure that your projection mount tool is set
up to match the size of the carriage rails on the projection assembly you are about to
remove. In the first 100 HFA II units produced, the carriage rails on the projection assembly
are 1/4" diameter, and the outer end of the carriage is stabilized by a spring that is mounted
with two screws. In later units, the carriage rails are 3/8" diameter, and there is no spring at
the outer end of the carriage. The projection mount tool can accommodate both rail sizes
E
(1/4" or 3/8") by rotating the two support stands on the tool by 180
Appendix A.
10) Lift the projection assembly up and out as you maneuver the turret through the
hole in the bowl assembly.
11) Install the projection assembly on the projection mount tool.
. See diagram in
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Replacement Notes:
Check/clean the optics as necessary before reinstalling the projection assembly.
Follow-up Checks/Adjustments:
See Table 3-1.
3.16 Projection Interconnect PCB Removal
1) Remove the front and rear covers (3.2, 3.3).
2) Disconnect all cables connected to the Projection Interconnect PCB.
3) Remove the finger shaft guard (two screws), which mounts to two standoffs on the
Projection Interconnect PCB.
4) Remove the two screws and two standoffs securing the Projection Interconnect
PCB, and remove the board.
Replacement Notes:
P When reinstalling the PCB, loosely install the two PCB mounting screws and leave
off the two standoffs temporarily. Position the PCB for proper clearance between
the flag and edge detector on the bottom side of the Projection Interconnect PCB
then tighten the screws and install the standoffs.
Follow-up Checks/Adjustments:
See Table 3-1.
3.17 Film Wedge/Motor Removal
Caution — The aperture wheel and ND wedges on the projection
assembly are delicate and easily damaged — work carefully! Any
fingerprints or contamination on the optical area of the film wedge may
necessitate replacement of the wedge; it cannot be cleaned, other than to
blow off any dust.
1) Remove the front and rear covers (3.2, 3.3).
2) Remove the screw securing the bracket that covers the film wedge motor.
3) Remove the two screws securing the film wedge to the film wedge motor shaft, and
remove the wedge.
4) Disconnect the "Right" (P4) cable from the Projector Interconnect PCB.
5) Remove the four screws securing the film wedge motor to the projection assembly.
NOTE - If washers between the motor and the frame are present they must be reinstalled.
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6) Remove the film wedge motor.
Replacement Notes:
P After installing the film wedge on the motor shaft, rotate the wedge and check for
proper clearance of the wedge in the film wedge edge detector.
Follow-up Checks/Adjustments:
See Table 3-1.
3.18 Glass Wedge/Motor Removal
Caution — The aperture wheel and ND wedges on the projection
assembly are delicate and easily damaged — work carefully! Any
fingerprints or contamination on the optical area of the film wedge may
necessitate replacement of the wedge; it cannot be cleaned, other than to
blow off any dust.
1) Remove the front and rear covers (3.2, 3.3).
2) Remove the two screws and standoffs that mount the finger guard bracket to the
Projector Interconnect PCB.
3) Disconnect all cables from the Projector Interconnect PCB.
4) Remove the two remaining screws securing the Projector Interconnect PCB and
remove the board.
5) Remove the projection lamp assembly.
6) Remove the film wedge.
7) Remove the screw holding the edge detector for the glass wedge. Push the edge
detector down and away from the glass wedge.
8) Loosen the two setscrews holding the glass wedge to the motor shaft, and remove
the wedge.
9) Remove the four screws securing the glass wedge motor, and remove the motor.
NOTE - If washers between the motor and the frame are present they must be reinstalled.
Replacement Notes:
P Route the cable from the glass wedge motor away from the carriage drive pulley
under the Projector PCB to avoid possible contact with the pulley.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.19 Color Wheel / Aperture Wheel Removal
NOTE - The aperture wheel can be removed only after the color wheel is removed.
1) Remove the front and rear covers (3.2, 3.3).
2) Disconnect the two large ribbon cable connectors from the Projection Interconnect
PCB.
3) If present, remove the two screws securing the spring at the outer end of the
carriage, as shown in Figure 3-6. (In the first 100 units produced, the carriage rails
on the projection assembly are 1/4" diameter, and the outer end of the carriage is
stabilized by a spring that is mounted with two screws, as shown. In later units, the
carriage rails are 3/8" diameter, and there is no spring at the outer end of the
carriage.)
4) Remove the two socket head screws holding the carriage assembly to the carriage
rail block (Figure 3-6). Carefully remove the carriage and place it on a padded
work surface that will support the color wheel/aperture wheel without damage to
the wheels.
FIGURE 3-6. Color Wheel/Aperture Wheel Removal
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(3.19 Color Wheel / Aperture Wheel Removal - continued)
(3.19 Color Wheel / Aperture Wheel Removal - continued)
(3.19 Color Wheel / Aperture Wheel Removal - continued)(3.19 Color Wheel / Aperture Wheel Removal - continued)
Caution — In the next steps, several wavy washers and flat washers will
be released. Note their relative positions so that you will be able to
reinstall them in the same order as removed.
5) Remove the retaining ring (E-clip) securing the shaft of the color wheel to the
carriage. Carefully remove the washers, and remove the color wheel.
Aperture Wheel removal:
6) Remove the retaining ring (E-clip) securing the shaft of the aperture wheel to the
carriage. Carefully remove the washers, and remove the aperture wheel.
Replacement Notes:
Ensure that the washers are reinstalled on the shaft(s) in the same order as removed
(Figure 3-6).
Follow-up Checks/Adjustments:
See Table 3-1.
3.20 Carriage Motor Removal
1) Remove the Projection Interconnect PCB (3.16).
2) Loosen the four screws securing the carriage motor to the projection assembly.
3) Remove the projection assembly, using all necessary precautions (3.15).
4) Cut any cable ties securing the carriage motor cable.
5) Remove the four loosened screws holding the motor in place, and remove the
motor.
6) Loosen the two setscrews on the carriage motor pulley, and remove the pulley
from the shaft.
Replacement Notes:
P The replacement cable tie(s) for the motor cable must be installed before
reinstalling the projection assembly in the instrument.
P Adjust the belt tension (Section 4).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.21 Shutter Removal
Caution — Handle the shutter carefully! It is delicate and easily
deformed or damaged.
1) Power on the HFA II. Note the level of system software at the top left corner of the
MAIN MENU. A10 or greater software level should be seen.
2) Proceed to Shutter Calibration and perform the following:
a) Select ALIGN SHUTTER. DO NOT make any further selections.
3) Remove the lamp access door.
4) Loosen the two setscrews that secure the film ND wedge to the motor shaft. Carefully
remove the film ND wedge. DO NOT bend or get fingerprints on either of the ND
wedges.
5) Observe the current position of the shutter. The new shutter will be installed at the same
position. THIS IS VERY IMPORTANT!
6) Loosen the setscrew that secures the shutter to the motor shaft.
Remove the shutter by slightly angling it while sliding it off the motor shaft. Use care not
to drop the shutter as the instrument power is on.
Replacement Notes:
P Install the new shutter on the motor shaft in the same position as the existing
shutter was installed. The shutter hub faces towards the motor as shown in Figure
3-7. Tighten the setscrew.
P Reinstall the film ND wedge and tighten the setscrews. Ensure that the flag does
not hit the edge detector during rotation.
P Position the shutter for adequate clearance between the glass wedge and the
projection casting. Gently bend the shutter, if necessary.
Follow-up Checks/Adjustments:
See Table 3-1.
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FIGURE 3-7. Shutter Installation on Motor Shaft
3.22 Shutter Motor Removal
1) Remove the projection assembly and install it on the projection mount tool (3.15).
2) Disconnect the shutter cable (P6) from the Projector Interconnect PCB (cut the
cable ties if necessary).
3) Remove the two screws securing the shutter motor to the projection assembly, and
remove the motor.
4) Loosen the setscrew securing the hub and shutter to the motor shaft, and remove
them from the shaft.
Replacement Notes:
P Position the shutter for adequate clearance between the glass wedge and the
projection casting. Gently bend the shutter, if necessary.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.23 Carriage Motor Belt Removal
1) If the Projector Interconnect PCB is at Revision A, remove it (3.16). If it is a
Revision B or later PCB, it has four holes for access to the carriage motor mounting
screws and need not be removed.
2) Loosen the four screws securing the carriage motor to the projection assembly.
3) Remove the two small screws securing the belt plate against the belt.
4) Remove the belt.
Replacement Notes:
Adjust the belt tension (Section 4).
Follow-up Checks/Adjustments:
See Table 3-1.
3.24 Horizontal (X-axis) Turret Motor Removal
1) Remove the front and rear covers (3.2, 3.3).
2) Disconnect the "X-Axis" 6-pin connector (P10) from the Projection Interconnect
PCB.
3) Remove the projection assembly and install it on the projection mount tool (3.15).
4) Remove the four screws securing the X-axis turret motor to the projection
assembly.
5) Remove the belt from the motor pulley; then remove the motor.
6) Loosen the two setscrews on the hub/pulley and remove it from the motor shaft.
Replacement Notes:
Adjust the belt tension (Section 4).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.25 Horizontal (X-axis) Turret Motor Belt Removal
1) Remove the projection assembly and install it on the projection mount tool (3.15).
NOTE - Before lifting the projection assembly out of the instrument, ensure that your
projection mount tool is set up to match the diameter of the carriage rails (1/4" or 3/8") on
this projection assembly. (See Appendix A.).
2) Carefully slide the X-axis turret motor belt off the large gear at the top of the turret.
Caution — In the next step, three screws are to be removed from the
turret. On early units, these are buttonhead socket screws, which have a
very shallow socket. DO NOT use a ballpoint socket wrench on these
screws, as this will strip the heads. Use a standard hex socket driver
without a ball point, and make sure the wrench is fully seated, squarely in
the screw head. Also, compounding the difficulty in removing the screws,
on some units these screws were mistakenly secured with permanent-type
Loctite®.
FIGURE 3-8. Arbor/Turret Removal
3) From the top side of the assembly, locate the hole in the casting that provides
access to the top edge of the turret. Through this hole, one by one, remove the
three screws that hold the turret in place (Figure 3-8). (Early units use buttonhead
socket screws; later units use slotted screws. Do Not interchange screws.)
(As the screws are removed, the X-axis edge detector flag on the turret becomes
loose. Check that the loosened flag does not hit the edge detector and block
rotation of the turret for access to the third screw.)
4) Carefully pull the turret out of its top bearing.
NOTE - Be careful to prevent dust or debris from reaching the internal optics of the
turret while the turret is open.
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5) Remove the turret motor belt.
Replacement Notes:
P Check/adjust the horizontal (X-axis) edge detector on the turret before reinstalling
the projection assembly into the instrument.
P Adjust the belt as necessary (see Section 4).
P DO NOT interchange slotted head and socket head turret screws.
P When the three turret screws have been tightened, secure each one with a small
dab of Loctite® No. 222 (see Appendix A for part number).
P When reassembled, manually rotate the turret to check for smooth movement
throughout its normal range.
Follow-up Checks/Adjustments:
Clean the optics. See Table 3-1.
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3.26 Vertical (Y-axis) Turret Belt/Motor Removal
Caution — Be careful not to damage or dirty the bowl.
1) Remove the Y-axis turret belt from the large pulley.
2) Remove the Y-axis turret belt from the small pulley.
Motor Removal:
3) Remove the two screws securing the Y-axis motor cable bracket.
4) Disconnect the motor cable at the connector.
5) Loosen the two setscrews on the motor pulley and remove it from the shaft.
6) Remove the four screws securing the Y-axis motor to the turret assembly.
7) Remove the Y-axis motor.
Replacement Notes:
Adjust the belt tension (Section 4).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.27 Brightness Detector (PCB) Replacement
1) Remove the front cover (3.2).
2) Rotate the turret to expose two screws securing the Brightness Detector PCB to the
detector assembly (Figure 3-8).
Caution — Do Not loosen or remove the screws that secure the detector
housing to the turret. If you do, it will be necessary to perform the detector
alignment procedure.
3) Disconnect the detector from its flex cable.
4) Remove the two screws exposed in step 2 (see Figure 3-9).
Caution — Once the Brightness Detector PCB is removed in the next
step, use care to not invert the detector housing, otherwise the small optics
may fall out.
5) Remove the Brightness Detector PCB.
Replacement Notes:
P Use care to not get dirt or fingerprints on the detector optics or on the turret lens.
P If any of the small optics have fallen out of the housing, make sure they are clean
before reinstalling them, and that they are installed in the correct order
(Figure 3-8).
P The Attenuation Spacer (see Figure 3-9) was Installed in HFA II models beginning
with the following Serial Numbers: 720-4059, 740-5548, 745-2290 and 750-6666.
P Refer to Service Bulletin HFA2-067 for additional replacement notes.
Follow-up Checks/Adjustments:
See Table 3-1.
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3-9 Brightness Detector Removal
3.28 Lower Turret Removal
1) Remove the front cover (3.2).
2) Remove two screws on the side of the lower turret pulley to detach the lower turret
assembly.
Carefully let the lower turret assembly hang by its cable.
Replacement Notes:
P Adjust the belt tension (Section 4).
P Check clearances of Y-motor edge detector.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.29 Turret Cable Assembly Removal
Replacement Notes:
P If a turret cable requires replacement, all three cables must be replaced as an
assembly.
Caution — Before removal of the old cable assembly, carefully note cable
routing and taping. Failure to properly install the turret cable assembly
will cause turret binding and turret noise.
Follow-up Checks/Adjustments:
See Table 3-1.
3.30 Chinrest/Headrest Switch Assembly Removal
1) Remove the operator panel (3.4).
2) Remove the three screws securing the chinrest switch assembly bracket.
3) Remove the chinrest switch assembly .
Replacement Notes:
Follow-up Checks/Adjustments:
See Table 3-1.
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3.31 Chinrest Y-axis Belt/Motor Removal
Belt:
1) Remove the front cover (3.2).
2) Remove the four screws securing the chinrest motor to the bracket.
3) Slip the belt off over the lip of the chinrest motor pulley.
4) Slip the belt off over the lip of the chinrest pulley.
Motor:
1) Remove the front cover (3.2).
2) Make note of the cable ties holding the cable to the chinrest motor, then cut the
cable ties. Disconnect the cable at the connector.
3) Remove the four screws securing the chinrest motor to the bracket.
4) Slip the belt off over the lip of the chinrest motor pulley, and remove the motor.
Replacement Notes:
P Adjust the belt tension (Section 4).
P Be sure to secure the connector to the motor body with a cable tie.
P Reattach the ground wire under the motor mounting screw.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.32 Patient Support Horizontal (X-axis) Belt/Motor
Removal
NOTE - The headrest drive belt drives the headrest horizontally in sync with the chinrest.
Anytime the headrest belt is off, if either the headrest or chinrest lead screw is rotated
independently, the headrest and chinrest will become misaligned.
P Remove the front cover (3.2).
P Pull the headrest drive belt (long belt) to move the chinrest horizontal lead screw
nut up against its limit nearest to the X-motor. (Since the chinrest and headrest
horizontal lead screws are linked by the belt, both lead screws will rotate when the
belt is pulled.)
Belt Removal:
1) Remove the four screws securing the chinrest assembly to the front cover assembly
(Figure 3-9).
2) Lift the chinrest assembly away from the front cover assembly and remove the belt
from the X-motor pulley.
3) Maneuver the belt downward between the headrest pulley and the front cover
assembly until the belt is free.
Motor Removal:
1) Remove the four screws securing the chinrest assembly to the front cover assembly
(Figure 3-10).
2) Remove the chinrest assembly.
(continued)
Service Guide
FIGURE 3-10. Removing the Chinrest Assembly
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(3.32 Patient Support Horizontal (X-axis) Belt/Motor Removal - continued)
(3.32 Patient Support Horizontal (X-axis) Belt/Motor Removal - continued)
(3.32 Patient Support Horizontal (X-axis) Belt/Motor Removal - continued)(3.32 Patient Support Horizontal (X-axis) Belt/Motor Removal - continued)
3) Disconnect the "X-MOTOR" cable (P4) from the Patient Support Interconnect PCB.
Cut any cable ties holding this cable to the Patient Support Interconnect PCB.
4) Rotate the motor shaft to position the lead screw nut close to the X-motor
(Figure 3-11).
5) Loosen the setscrews holding the lead screw to the motor shaft.
6) Grasp the chinrest and move it away from the X-motor until the lead screw
disengages from the motor shaft.
7) Remove the four screws securing the X-motor to the bracket, and remove the
motor.
FIGURE 3-11. Disconnecting the X-Motor Lead Screw from the Motor Shaft
Replacement Notes:
P Be sure to reinstall a nylon washer on the motor shaft before attaching the lead
screw. The lead screw should be seated on the motor shaft all the way up to the
motor body before tightening the setscrews.
P Before installing the belt:
After the lead screw is secured to the motor shaft, rotate the shaft to position the
lead screw nut up against its limit nearest to the motor. Then set the headrest
horizontal lead screw nut to the same relative position (check for the same amount
of thread showing on both lead screws).
P Adjust the drive belt (Section 4).
P Be sure to reinstall the wire clamp and carefully position the wires to prevent
contact with any of the moving chinrest mechanism (see Figure 3-12 for routing of
cables and locations of cable ties).
Follow-up Checks/Adjustments:
See Table 3-1.
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Note: Dotted line indicates cable lies behind object
shown in foreground.
FIGURE 3-12. Trial Lens Assy Cable Routing and Cable Ties
Service Guide
Note: The cable emerging from base of trial
lens holder must have adequate slack for
lowering the trial lens holder.
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3.33 Chinrest Vertical Slide and Lead Screw Removal
1) Remove the front cover (3.2).
2) Remove the four screws securing the chinrest assembly to the front cover
(Figure 3-10), and remove the assembly.
3) Remove the plastic chinrest (2 screws).
4) Remove the chinrest cover bracket (2 screws).
5) Turn the pulley on the chinrest X-axis motor to move the chinrest assembly left or
right to gain access to the screws holding the vertical lead screw and vertical slide.
Replacement Notes:
P Before installing the headrest drive belt, set the chinrest and headrest horizontal
lead screw nuts both to the same relative position (check for the same amount of
thread showing on the same side of the lead screws).
P Adjust the drive belt (Section 4).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.34 Chinrest Horizontal Slide Removal
1) Remove the front cover (3.2).
2) Remove the four screws securing the chinrest assembly to the front cover
(Figure 3-9).
3) Remove the two screws holding the trial lens trap.
4) Remove the two screws holding the stationary part of the horizontal slide.
5) Remove the two screws holding the moving part of the horizontal slide.
6) Remove the entire slide assembly out from between the stationary bracket and the
movable bracket of the chinrest assembly.
Replacement Notes:
P Check the tension of the vertical (Y-axis) and horizontal (X-axis) drive belts
(Section 4).
P Straighten the bristles on the trial lens trap brush to position them to the inside of
the slot in the trap.
P Before installing the headrest drive belt, set the chinrest and headrest horizontal
lead screw nuts both to the same relative position (check for the same amount of
thread showing on the same side of the lead screws).
Follow-up Checks/Adjustments:
See Table 3-1.
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3.35 Trial Lens Holder Assembly Removal
1) Remove the front cover (3.2).
2) Disconnect the "TRIAL LENS LEDS" cable (P5) from the Patient Support Interconnect
PCB. Cut any cable ties securing this cable.
3) Remove the two screws that secure the trial lens holder assembly to the pivot shaft.
4) Cut the cable tie that secures the ground wire and trial lens LED wires to the trial lens
holder assembly. (The same ground wire will be used with the replacement trial lens
holder.)
5) Carefully manipulate the lower end of the trial lens holder and attached cable out
through the slot in the trial lens trap.
If the pivot block removal is also required, continue as follows:
Caution — A captive steel ball and
compression spring will fall loose as the pivot
block is removed (Figure. 3-13).
6) Hold the pivot block against the main
patient support bracket, and remove the
pivot screw from the trial lens holder
(Figure 3-13).
7) Once the pivot screw has been removed,
slowly raise the pivot block and catch the
steel ball and compression spring as they
are released.
Replacement Notes:
P Note: The new zero degree lens holder
cannot be interchanged with the original
eight degree lens holder, and can only be
used in conjunction with the new bowl
assembly. The new bowl assembly can be
identified by the location of the Reflex
LED, just below the Large Fixation
Diamond (moved from the left of the
Central Fixation LED).
P Be sure that the steel ball and
compression spring are in place before
securing the pivot block.
FIGURE 3-13. Pivot Block Removal
P Make sure that the curved washers are positioned on the pivot screw with the correct
side against the flat washer (Figure 3-13).
P Before reinstalling the trial lens holder assembly in the patient support assembly, check
for proper operation of the edge detector flag when the trial lens holder is raised and
lowered. Ensure that the compression spring that holds tension against the flag is not
overcompressed and preventing proper movement of the flag.
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P Before reinstalling the front cover, lift and lower the trial lens holder several times to
check that it operates properly and that the wires to the trial lens holder are not catching
or rubbing against the cover.
P Refer to section 4.9.6 for Trial Lens Holder information.
Follow-up Checks/Adjustments:
See Table 3-1.
3.36 Top Fan Removal
PREVIOUS STYLE (Two Types) Refer to 7-16.
1) Remove the front and rear covers (3.2, 3.3).
2) Remove the projection assembly (3.15).
3) Unplug the fan cable. For reference during reassembly, notice how the fan
wires are routed around the flange of the fan and through the narrow slot in
the inner edge of the fan housing, to prevent the wires from being pinched.
4) Remove the foam cover from over the rectangular fan access hole in the front
of the chassis.
5) Remove the four screws securing the fan in its plastic housing.
6) Manipulate the fan out through the access hole.
CURRENT STYLE Refer to 7-16
1) Remove front and rear covers (3.2, 3.3)
2) Unplug the fan cable.
3) Remove the two screws attaching the fan bracket to the chasis.
Replacement Notes:
P Make sure that the fan wires are positioned in the narrow slot in the edge of
the plastic fan housing, and that they are not pinched when the fan mounting
screws are tightened.
Follow-up Checks/Adjustments:
See Table 3-1.
Service Guide
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3.37 Bowl IR LED Assembly Removal
NOTE - Before removing the left or right bowl IR LED assembly, refer to the Bowl IR
LED Adjustment procedure in Section 4. The position of the cold mirror must be marked
before the IR LED assembly is removed.
1) Remove the front and rear covers (3.2, 3.3).
2) Remove the tape holding the IR LED assembly wires to the outside of the
bowl, and unplug the connector.
3) For the right-hand bowl IR LED, slide the connector and wires out towards the
front, between the bowl and the rubber gasket that seals between the baffle
and the bottom of the bowl.
4) OLD BOWL: Remove the two screws holding the left/right IR LED assembly
to the outside of the bowl.
NEW BOWL: Remove the two screws holding the IR LED clamps to release
the IR LED assembly.
5) If the IR source is to be replaced, cut the RTV to release the IR source from its
mounting flange.
Replacement Notes:
P Make sure that the rubber gasket is sealing against the bowl after the
replacement bowl IR LED assembly has been installed.
P If only the LED is being replaced on the Old Bowl, DO NOT apply RTV to
hold the new LED in place until installation and adjustment of the LED have
been completed. When ready for the RTV, squeeze some out onto a piece of
waste paper and allow it to become tacky and thicken slightly before you apply
it.
P Tighten the left/right IR LED mounting screws only finger tight until after
adjustment has been performed.
Follow-up Checks/Adjustments:
See Table 3-1.
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3.38 Blue-Yellow Module / Bowl Plug Removal
This procedure is for removing the Blue-Yellow module in units equipped with the
Blue-Yellow feature, or the Blue-Yellow bowl plug in units not equipped with the
Blue-Yellow feature.
1) Remove the front and rear covers (3.2, 3.3).
2) Remove the projection assembly (3.15).
3) Remove the two screws and washers securing the Blue-Yellow module or
Blue-Yellow bowl plug to the frame.
4) Lift out the Blue-Yellow module or bowl plug from the top of the bowl.
5) For units with the new bowl, the Blue/Yellow plug snaps into place.
Replacement Notes:
Follow-up Checks/Adjustments:
See Table 3-1.
Service Guide
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