Humphrey Field Analyzer II-i Series Service manual

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II-i series

Service Manual

Service Manual

Service ManualService Manual

Copyright

© 2012 Carl Zeiss Meditec, Inc. All rights reserved.

Trademarks

Humphrey is a registered trademark of Carl Zeiss Meditec, Inc. in the United States and/or
other countries.

All other trademarks used in this document are the property of their respective owners.

IMPORTANT NOTE

This service document contains detailed procedures and descriptions specially compiled for
Carl Zeiss service staff. For understanding the contents and for the reliable performance of
service work, it is essential that product-specific service training be completed with Carl Zeiss
Meditec, Inc. or a training organization commissioned by Carl Zeiss Meditec, Inc.

All information contained in the document must be treated strictly confidentially and must not
be passed on to third parties either in the original or as a copy.

REVISION CONTROL LIST

Document: Humphrey Field Analyzer II-i series Service Manual
Part No.: 2660021142868
Issued Date: May 2012

Listed at the bottom of each page is the part number of the service manual, along with the
Revision letter and date for that page (for example, 2660021142868B0512). 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

• CSA 3rd Edition requirements have been added.

• Updates have been incorporated.

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Humphrey Field Analyzer II-i Table of Contents

Table of Contents

Section 1 – General Information

1.1 About this Manual ............................................................................................................ 1-3

1.1.1 General Information ............................................................................................. 1-3

1.1.2 Conventions ......................................................................................................... 1-4

1.2 Service Bulletins ............................................................................................................... 1-4

1.3 HFA II-i Service Strategy .................................................................................................. 1-5

1.3.1 Two-Level Service Strategy .................................................................................. 1-5

1.3.2 Three Steps to Completing an HFA II-i Service Call ............................................. 1-5

1.3.3 HFA II-i Field Service Paperwork Requirements ................................................... 1-6

1.4 Configuration Parameters ................................................................................................. 1-6

1.5 Classification / Compliance ............................................................................................... 1-7

1.6 System Electrical Information ........................................................................................... 1-7

1.7 Safety Information ............................................................................................................ 1-8

1.8 Symbols and Labels ......................................................................................................... 1-10

1.9 Protective Packing Information / Symbols ......................................................................... 1-12

1.10 Environmental Specifications ............................................................................................ 1-12

1.11 Internal Layout ................................................................................................................. 1-13

1.12 Special Topics .................................................................................................................. 1-13

1.12.1 Touch Screen ....................................................................................................... 1-13

1.12.2 Gaze Tracking ...................................................................................................... 1-13

1.12.3 Head Tracking / Auto Pupil / Vertex Monitoring ................................................... 1-16

1.12.4 HFA II-i Light Intensity Fundamentals .................................................................. 1-17

1.12.5 Comparing the HFA II and HFA II-i ...................................................................... 1-17

Section 2 – PM and System Checkout

2.1 Preventive Maintenance ................................................................................................... 2-3

2.1.1 HFA II-i Preventive Maintenance Procedure ......................................................... 2-3

2.2 Operator Maintenance Tasks ............................................................................................ 2-4

2.3 System Checkout .............................................................................................................. 2-5

2.3.1 HFA II-i System Checkout Procedure ................................................................... 2-7

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Section 3 – Parts Removal / Replacement

3.1 General Instructions .......................................................................................................... 3-3

3.1.1 Table 3-1 .............................................................................................................. 3-6

3.1.2 Removal of the HFA II-i from the Power Table ..................................................... 3-8

3.2 Front Cover Assembly Removal ....................................................................................... 3-9

3.3 Rear Cover Assembly Removal......................................................................................... 3-9

3.4 Operator Panel Assembly Removal .................................................................................. 3-10

3.5 Drive Housing Assembly Removal .................................................................................... 3-12

3.6 CPU / Backplane Enclosure Removal ............................................................................... 3-14

3.7 CPU and Backplane Removal .......................................................................................... 3-15

3.8 Motor Drive PCB Removal ............................................................................................... 3-16

3.9 Separation of the CPU PCB from the Backplane Board ................................................... 3-17

3.10 Power Supply Removal .................................................................................................... 3-18

3.11 CRT PCB Removal ........................................................................................................... 3-18

3.12 CRT Removal ................................................................................................................... 3-19

3.13 Touch Screen Removal .................................................................................................... 3-21

3.14 CCD Camera Removal ..................................................................................................... 3-21

3.15 Fixation Interconnect PCB Removal ................................................................................. 3-22

3.16 Central Fixation LED / Beamsplitter Removal ................................................................... 3-23

3.17 Projection Assembly Removal .......................................................................................... 3-24

3.18 Projection Interconnect PCB Removal .............................................................................. 3-25

3.19 Film Wedge / Motor Removal ........................................................................................... 3-26

3.20 Glass Wedge / Motor Removal ......................................................................................... 3-26

3.21 Color Wheel / Aperture Wheel Removal ........................................................................... 3-27

3.22 Carriage Motor Removal .................................................................................................. 3-29

3.23 Shutter Removal ............................................................................................................... 3-29

3.24 Shutter Motor Removal .................................................................................................... 3-30

3.25 Carriage Motor Belt Removal ........................................................................................... 3-30

3.26 Horizontal (X-axis) Turret Motor Removal ........................................................................ 3-31

3.27 Horizontal (X-axis) Turret Motor Belt Removal ................................................................. 3-31

3.28 Vertical (Y-axis) Turret Belt / Motor Removal ................................................................... 3-33

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3.29 Brightness Detector (PCB) Replacement ........................................................................... 3-33

3.30 Lower Turret Removal ...................................................................................................... 3-35

3.31 Turret Cable Assembly Removal ....................................................................................... 3-35

3.32 Chinrest / Headrest Switch Assembly Removal ................................................................. 3-35

3.33 Chinrest Y-axis Belt / Motor Removal ............................................................................... 3-36

3.34 Patient Support Horizontal (X-axis) Belt / Motor Removal ................................................ 3-37

3.35 Chinrest Vertical Slide and Lead Screw Removal ............................................................. 3-40

3.36 Chinrest Horizontal Slide Removal ................................................................................... 3-40

3.37 Trial Lens Holder Assembly Removal ............................................................................... 3-41

3.38 Top Fan Removal ............................................................................................................. 3-43

3.39 Bowl IR LED Assembly Removal ...................................................................................... 3-43

3.40 Blue-Yellow Module / Bowl Plug Removal ........................................................................ 3-44

3.41 Bowl Removal .................................................................................................................. 3-44

3.42 Reflex Gaze LED Removal ............................................................................................... 3-45

3.43 Bowl Lamp Assembly Removal ........................................................................................ 3-46

3.44 IR Bowl Plug Removal / Installation .................................................................................. 3-46

3.45 Quarter-Turn Fastener Replacement ................................................................................. 3-47

3.46 System Fuse Replacement ................................................................................................ 3-48

3.47 Power Table Fuse Replacement ........................................................................................ 3-50

3.48 Stimulus Projection Lamp Replacement ............................................................................ 3-52

3.49 Air Intake Filter Replacement ............................................................................................ 3-55

Section 4 – Adjustment and Calibration

4.1 Introduction ...................................................................................................................... 4-3

Calibration and Adjustment Flow Chart ............................................................................... 4-5

4.2 Related Procedures .............................................................................................................. 4-7

4.2.1 HFA II-i Calibration and Service Guidelines ............................................................ 4-7

4.3 Calibration / Diagnostics Access ........................................................................................... 4-8

4.4 Show Dialog ........................................................................................................................ 4-8

4.5 System Log ......................................................................................................................... 4-8

4.6 Database ............................................................................................................................. 4-8

4.7 Video Test Pattern ............................................................................................................... 4-8

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4.8 Calibration .......................................................................................................................... 4-9

4.8.1 Verification (Obtaining Before & After Light Intensity Calibration Values) ............... 4-9

4.8.1.1 Intensity / Spot Ratio Using the Minolta Light Meter Kit .......................... 4-9

4.8.1.1.1 Minolta Meter Set Up and Preparation for Testing .................. 4-11

4.8.1.1.2 Loading the P Factors into the HFA Calibration Menu ........... 4-12

4.8.1.1.3 White Spot Intensity Verification ............................................. 4-12

4.8.1.1.4 White Bowl Intensity Verification ............................................ 4-13

4.8.1.1.5 Blue Spot Intensity Verification ............................................... 4-13

4.8.1.1.6 Yellow Bowl Intensity Verification ........................................... 4-13

4.8.1.1.7 Cal/Wedge Printout ................................................................ 4-14

4.8.1.1.8 Evaluating Results .................................................................. 4-14

4.8.1.1.9 Evaluating White Light Verification Data Printout Results ....... 4-14

4.8.1.1.10 Evaluating Blue-Yellow Verification Data Printout Results ...... 4-14

4.8.1.1.11 Evaluating Cal/Wedge Printout ............................................... 4-14

4.8.1.2 Intensity / Spot Ratio Using the Soligor Light Meter Kit ........................... 4-15

4.8.1.2.1 Soligor Meter Set Up and Preparation for Testing ................... 4-16

4.8.1.2.2 Loading the P Factors into the HFA Calibration Menu ........... 4-16

4.8.1.2.3 White Spot Intensity Verification ............................................. 4-16

4.8.1.2.4 White Bowl Intensity Verification ............................................ 4-17

4.8.1.2.5 Blue Spot Intensity Verification ............................................... 4-18

4.8.1.2.6 Yellow Bowl Intensity Verification ........................................... 4-18

4.8.1.2.7 Cal/Wedge Printout ................................................................ 4-18

4.8.1.2.8 Evaluating Results .................................................................. 4-18

4.8.1.2.9 Evaluating White Light Verification Data Printout Results ....... 4-19

4.8.1.2.10 Evaluating Blue-Yellow Verification Data Printout Results ...... 4-19

4.8.1.2.11 Evaluating Cal/Wedge Printout ............................................... 4-19

4.8.1.3 Exerciser ................................................................................................... 4-19

4.8.1.4 QA Tests ................................................................................................... 4-19

4.8.2 Mechanical .............................................................................................................. 4-20

4.8.2.1 Projector ................................................................................................... 4-20

4.8.2.2 Shutter ..................................................................................................... 4-21

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4.8.2.3 Aperture ................................................................................................... 4-22

4.8.2.3.1 Aperture Wheel Hole Centering Verification ........................... 4-22

4.8.2.3.2 Aperture Spot Ratio Test ........................................................ 4-23

4.8.2.3.3 Measuring and Saving the Aperture Spot Ratio ...................... 4-24

4.8.2.4 Color ........................................................................................................ 4-24

4.8.2.5 Right / Left Home ..................................................................................... 4-25

4.8.2.6 Offset ........................................................................................................ 4-25

4.8.2.7 Focus ........................................................................................................ 4-25

4.8.2.8 Detector .................................................................................................... 4-26

4.8.2.9 Target ....................................................................................................... 4-27

4.8.3 Intensity ................................................................................................................... 4-29

4.8.3.1 Projector Intensity Using the Minolta Light Meter Kit............................... 4-29

4.8.3.1.1 White Projector Intensity......................................................... 4-29

4.8.3.1.2 Blue Projector Intensity ........................................................... 4-30

4.8.3.2 Projector Intensity Using the Soligor Light Meter Kit ............................... 4-31

4.8.3.2.1 White Projector Intensity......................................................... 4-31

4.8.3.2.2 Blue Projector Intensity ........................................................... 4-33

4.8.3.3 Bowl Intensity Using the Minolta Light Meter Kit ..................................... 4-34

4.8.3.3.1 White Bowl Intensity ............................................................... 4-34

4.8.3.3.2 Yellow Bowl Intensity ............................................................. 4-35

4.8.3.4 Bowl Intensity Using the Soligor Light Meter Kit ..................................... 4-36

4.8.3.4.1 White Bowl Intensity ............................................................... 4-36

4.8.3.4.2 Yellow Bowl Intensity ............................................................. 4-37

4.8.3.5 Wedge ...................................................................................................... 4-38

4.8.3.6 Blue Correction ........................................................................................ 4-39

4.8.4 Print Cal Values ....................................................................................................... 4-43

4.8.5 Miscellaneous .......................................................................................................... 4-43

4.8.6 Camera ................................................................................................................... 4-43

4.8.6.1 Camera Position / Size .............................................................................. 4-43

4.8.6.2 Gaze Position / Size .................................................................................. 4-46

4.8.6.3 Camera Intensity ...................................................................................... 4-47

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4.9 Adjustments ......................................................................................................................... 4-49

4.9.1 Patient Support Horizontal Leadscrew Adjustment .................................................. 4-49

4.9.2 Belt Tension ............................................................................................................ 4-50

4.9.3 Edge Detector .......................................................................................................... 4-50

4.9.4 Touch Screen .......................................................................................................... 4-50

4.9.5 CRT Adjustments..................................................................................................... 4-52

4.9.6 Trial Lens Holder ..................................................................................................... 4-55

4.9.7 Camera Focus ......................................................................................................... 4-58

4.9.8 IR LED Alignments .................................................................................................. 4-60

Section 5 – Troubleshooting

5.1 Introduction ...................................................................................................................... 5-3

5.2 General Guidelines for Assembly Level Troubleshooting .................................................. 5-3

5.3 A Guide to HFA II-i Service Diagnostic Aids ..................................................................... 5-7

5.4 Software Module Identifiers .............................................................................................. 5-8

5.5 HFA II-i Motor Exerciser and QA Test Points .................................................................... 5-9

5.6 Printrex Printer Self Test and Error Handling .................................................................... 5-11

5.6.1 Printer Self Test .................................................................................................... 5-11

5.6.1.1 Printer Self Test – Printrex Model 40038 ............................................... 5-11

5.6.1.2 Printer Self Test – Printrex Model 54306 ............................................... 5-11

5.6.1.3 Printer Self Test – Printrex Model 26600211124420 ............................. 5-15

5.6.2 Printrex Printer Errors and Error Handling............................................................ 5-16

5.7 Power-On Self Tests ......................................................................................................... 5-17

5.7.1 Motor Driver Board Startup .................................................................................. 5-17

5.8 Startup State Errors .......................................................................................................... 5-19

5.9 Hexadecimal Error Codes ................................................................................................ 5-25

5.10 Common Error Messages / Solutions ................................................................................ 5-27

5.11 Instrument / BIOS Configuration ...................................................................................... 5-31

5.11.1 Instrument Configuration ...................................................................................... 5-31

5.11.2 BIOS Configuration Version ≥5.1 ........................................................................ 5-32

5.11.3 BIOS Configuration Version 4.1, 4.2.2. 5.0 .......................................................... 5-36

5.11.4 BIOS Configuration Version <4.1 ........................................................................ 5-38

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Section 6 – Diagrams

FIGURE 6.1 System Interconnect Diagram SW/HW Version ≤5.0 ........................................... 6-3

FIGURE 6.2 System Interconnect Diagram SW/HW Version ≥5.1 ........................................... 6-5

FIGURE 6.3. Version ≤5.0 System Block Diagram.................................................................... 6-7

FIGURE 6.4 Version ≥5.1 System Block Diagram.................................................................... 6-8

FIGURE 6.5 Version ≤5.0 CPU PCB Functions and Connections ............................................ 6-9

FIGURE 6.6 Version ≤5.0 CPU PCB Component and Jumper Locations ................................ 6-10

FIGURE 6.7 Version ≥5.1 CPU PCB and I/O Port Locations ................................................... 6-11

FIGURE 6.8 Version ≥5.1 CPU PCB Connector Locations (part 1 of 2) .................................. 6-12

FIGURE 6.9 Version ≥5.1 CPU PCB Connector Locations (part 2 of 2) .................................. 6-13

FIGURE 6.10 Backplane Board Connector Locations ................................................................ 6-14

FIGURE 6.11 Backplane Board Component Locations .............................................................. 6-15

FIGURE 6.12 Motor Driver Board .............................................................................................. 6-16

FIGURE 6.13 Fixation Interconnect PCB .................................................................................... 6-17

FIGURE 6.14 Patient Support Assembly ..................................................................................... 6-17

FIGURE 6.15 Power Entry and Power Supply ............................................................................ 6-18

FIGURE 6.16 Projection Assembly ............................................................................................. 6-19

FIGURE 6.17 Projection Path ..................................................................................................... 6-20

Section 7 – Parts

7.1 Introduction ......................................................................................................................... 7-3

7.2 Parts Orders — U.S. Domestic Service Operations .............................................................. 7-3

7.3 Parts Orders — International Service Operations ................................................................. 7-3

7.4 Returning Defective Parts / Subassemblies ........................................................................... 7-3

7.4.1 Equipment Return Authorization .......................................................................... 7-4

7.4.2 Packing for Shipment ........................................................................................... 7-4

7.4.3 Returning Defective Parts ..................................................................................... 7-4

7.5 Recommended Spares ......................................................................................................... 7-5

7.6 Parts Lists ............................................................................................................................ 7-5

7.6.1 Accessories / Supplies / Consumables ................................................................... 7-5

7.6.1.1 Accessories / Supplies / Consumables – Version ≤5.0 ........................... 7-5

7.6.1.2 Accessories / Supplies / Consumables – Version ≥5.1 ........................... 7-7

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7.6.2 Shipping Materials and Repack Instructions .......................................................... 7-7

7.7 Illustrated Parts Breakdown ................................................................................................. 7-10

7.7.1 Abbreviation Definitions ....................................................................................... 7-10

7.7.2 HFA II-i Miscellaneous – 1 .................................................................................... 7-12

7.7.3 HFA II-i Miscellaneous – 2 .................................................................................... 7-14

7.7.4 Patient Support Assembly ..................................................................................... 7-18

7.7.5 Chinrest / Trial Lens Holder Assembly .................................................................. 7-20

7.7.6 Projection Assembly ............................................................................................. 7-22

7.7.7 Projector Assembly ............................................................................................... 7-24

7.7.8 Projection Turret Assembly ................................................................................... 7-26

7.7.9 Bowl Assembly ..................................................................................................... 7-28

7.7.10 Operator Panel Assembly ..................................................................................... 7-32

7.7.11 B/Y Lamp Assembly ............................................................................................. 7-34

7.7.12 Drive Mounting Assembly Version ≤5.0 ............................................................... 7-36

7.7.13 Drive Mounting Assembly Version ≥5.1 ............................................................... 7-38

7.7.14 CPU / Backplane Enclosure Version ≤5.0 ............................................................ 7-40

7.7.15 CPU / Backplane Enclosure Version ≥5.1 ............................................................ 7-44

7.7.16 Power Table / Printer Assemblies .......................................................................... 7-50

7.7.17 Upper Fan Assembly ............................................................................................ 7-52

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 Kit ................................................................................. A-3

A.2.2 Minolta Light Meter Kit ................................................................................ A-3

A.2.3 Bowl Shroud ............................................................................................... A-3

A.2.4 Trial Lens Alignment Adaptor ...................................................................... A-3

A.2.5 Fake Eye ..................................................................................................... A-4

A.2.6 Tool Stand Assembly ................................................................................... A-4

A.2.7 Mirror Tool .................................................................................................. A-4

A.2.8 CRT Overlay ............................................................................................... A-4

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A.2.9 Spot Positioning Cross Fixture ..................................................................... A-4

A.2.10 Brightness Detector Alignment Target .......................................................... A-5

A.2.11 Projection Mount ......................................................................................... A-6

A.2.12 Operator Panel Extension / Support ............................................................ A-7

A.2.13 Hard Drive LED Assembly ........................................................................... A-8

A.2.14 Service Key ................................................................................................. A-8

A.2.15 Diagnostic Support Tool .............................................................................. A-8

A.2.16 Loopback Tool ............................................................................................ A-9

A.2.17 Static Protection Kit ..................................................................................... A-9

A.2.18 Communications Terminals / Laptop ........................................................... A-10

Appendix B. The Interface Ports ............................................................................................... B-1

B.1 General Information ................................................................................................... B-1

B.2 RS-232 Interface Hardware and Pin Assignments ....................................................... B-3

Appendix C. Data Transfers ..................................................................................................... C-1

C.1 Serial Transfer Modes ................................................................................................. C-1

C.2 HFA I to HFA II-i Serial Data Transfer ........................................................................ C-2

C.3 HFA II to HFA II-i Serial Data Transfer ....................................................................... C-4

C.4 HFA II-i to HFA II-i Serial Data Transfer ..................................................................... C-6

C.5 HFA II-i to Third Party Programs Serial Data Transfer ................................................ C-8

Appendix D. Peripherals ........................................................................................................... D-1

D.1 Printers ....................................................................................................................... D-1

D.2 USB HUB ................................................................................................................... D-2

D.3 USB (Key Type) Storage Device ................................................................................. D-2

D.4 NAS Drives ................................................................................................................. D-3

D.4.1 NAS Drives Installation ................................................................................... D-3

D.5 Mouse ........................................................................................................................ D-13

D.6 Keyboard .................................................................................................................... D-13

D.7 Monitor ...................................................................................................................... D-13

D.8 Uninterruptible Power Supply (UPS) .......................................................................... D-13

Appendix E. Light Meter General Information / Setup .............................................................. E-1

E.1 Minolta Light Meter .................................................................................................... E-1

E.2 Soligor Light Meter ..................................................................................................... E-2

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Appendix F. Operating System ................................................................................................. F-1

Appendix G. Initializing the Cal / Config Data

Setting Serial Number

Setting the Hardware Options

Hard Disk Format & Restore Table

Setting the Software Options ................................................................................ G-1

G.1 Initializing the Cal / Config Data ................................................................................. G-3

G.2 Setting Serial Number ................................................................................................ G-3

G.3 Setting the Model / Hardware Options ........................................................................ G-4

Hard Disk Format & Restore Table ............................................................................. G-5

G.4 Setting the Software Options ...................................................................................... G-6

Appendix H. Calibration Printouts ............................................................................................. H-1

H.1 Cal / Wedge Printout .................................................................................................. H-1

H.2 Automated Light Intensity Printouts ............................................................................ H-7

Appendix I. Service Forms ....................................................................................................... I-1

Appendix J. System Screens and Logs ..................................................................................... I-1

J.1 Boot Screen ................................................................................................................ J-1

J.2 Unit Configuration Screen .......................................................................................... J-1

J.3 System Log ................................................................................................................ J-4

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

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

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K.6 Hard Disk Drive - Troubleshooting Dialogue .............................................................. K-6

K.7 Magnetic Optical Disks ............................................................................................... K-7

Appendix L. Initializing the Hard Disk ....................................................................................... L-1

Appendix M. Loading Application Software .............................................................................. M-1

Appendix N. Special Software Options ...................................................................................... N-1

Appendix O. Hardware Upgrades ............................................................................................. O-1

Appendix P. HFA Data Transfer Cable Diagrams ..................................................................... P-1

Appendix Q. Cleaning Optics .................................................................................................... Q-1

Q.1 Cleaning Supplies ....................................................................................................... Q-2

Q.2 General Cleaning Procedures ..................................................................................... Q-2

Appendix R. Optional Software Installation ............................................................................... R-1

Appendix S. Network Connectivity Goals & Requirements ....................................................... S-1

Appendix T. HFA Data Compatibility ....................................................................................... T-1

Appendix U. Description of New Behavior for Patient Data w/version 5.0 & Greater ................ U-1

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Section 1 – General Information

1.1 About this Manual ...................................................................................................... 1-3

1.1.1 General Information ....................................................................................... 1-3

1.1.2 Conventions ................................................................................................... 1-4

1.2 Service Bulletins ......................................................................................................... 1-4

1.3 HFA II-i Service Strategy ............................................................................................ 1-5

1.3.1 Two-Level Service Strategy ............................................................................ 1-5

1.3.2 Three Steps to Completing an HFA II-i Service Call ....................................... 1-5

1.3.3 HFA II-i Field Service Paperwork Requirements ............................................. 1-6

1.4 Configuration Parameters ........................................................................................... 1-6

1.5 Classification / Compliance ......................................................................................... 1-7

1.6 System Electrical Information ..................................................................................... 1-7

1.7 Safety Information ...................................................................................................... 1-8

1.8 Symbols and Labels ................................................................................................... 1-10

1.9 Protective Packing Information / Symbols ................................................................... 1-12

1.10 Environmental Specifications ...................................................................................... 1-12

1.11 Internal Layout ........................................................................................................... 1-13

1.12 Special Topics ............................................................................................................ 1-13

1.12.1 Touch Screen ................................................................................................. 1-13

1.12.2 Gaze Tracking ................................................................................................ 1-13

1.12.3 Head Tracking / Auto Pupil / Vertex Monitoring ............................................. 1-16

1.12.4 HFA II-i Light Intensity Fundamentals ............................................................ 1-17

1.12.5 Comparing the HFA II and HFA II-i ................................................................ 1-17

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1.1 About This Manual

1.1.1 General Information

This manual is the field service reference for troubleshooting, repair, alignment, and calibration of
the Models 720-i, 740-i, 745-i, and 750-i HFA II-i series Humphrey Field Analyzers. The manual
is intended for use by Field Support Engineers who have completed Carl Zeiss Meditec service
training on the Humphrey Field Analyzer II-i series.

The service manual is designed to support Level 1 of a two-level service strategy. Level 1 (on-site)
field service 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 presented in Carl Zeiss Meditec training classes. See Section 1.3 for
additional information regarding the Humphrey Field Analyzer II-i series service strategy.

Carl Zeiss Meditec, Inc. will make available on request circuit diagrams, component part lists,
descriptions, calibration instructions, or other information that will assist Product-specific Trained
SERVICE PERSONNEL by Carl Zeiss Meditec, Inc. or a training organization commissioned by
Carl Zeiss Meditec, Inc. to repair those parts of the EQUIPMENT that are designated by CZMI as
repairable by SERVICE PERSONNEL.

For complete installation instructions, operation instructions, specifications, routine maintenance,
and safety information, please refer to the user manual.

The procedures in this manual assume that the reader is familiar with operation of the instrument.
Information presented in the user manual is not repeated in this service manual. The user manual
can be ordered separately by standard Zeiss parts order. Refer to Section 7 in this service manual
for user manual part number information.

Update revisions to this service manual will be issued by Field Service Bulletin, as required.

The general layout of the service manual is shown below. For greater detail, please refer to
the Table of Contents.

Level 1 Service Manual Layout

Section 1  General Information

Section 2  PM & System Checkout

Section 3  Parts Removal / Replacement

Section 4  Adjustment / Calibration

Section 5  Troubleshooting

Section 6  Diagrams

Section 7  Parts

Appendices

Humphrey Field Analyzer II-i series Service Bulletins

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1.1.2 Conventions

The following conventions apply in this manual:



Front and Back sides of the instrument is as viewed from the front (patient side) of the
instrument, unless noted otherwise.



All tool sizes for screws and nuts mentioned in the instructions are metric unless noted
otherwise.

1.2 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:



instrument design changes



technical problems and

corrections



software updates



new troubleshooting procedures



problem alerts



service manual revisions

Your service bulletins should be filed in the back of this manual under the Service Bulletins
tab, where easily accessible for quick reference.



recommended spare parts



new calibration or adjustment

procedures



upgrade announcements /

procedures



system checkout – checklist



service disclaimer form

Field Service Bulletins are Confidential and Proprietary, for the sole use
of personnel employed by Carl Zeiss Meditec, Carl Zeiss Meditec
affiliates, and authorized Carl Zeiss Meditec distributors.
Carl Zeiss Meditec has a well-deserved reputation for high quality,
reliable instruments, unsurpassed in the industry.

As a Carl Zeiss Meditec employee, affiliate, or distributor you are required
to handle your service bulletins as appropriate for proprietary and confi­dential information.

Service Manual

NOTICE

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1.3 HFA II-i Service Strategy

1.3.1 Two-Level Service Strategy

A two-level service strategy is used for the HFA II-i:

• On-site service

• Repair Center service

On-site 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
Carl Zeiss Meditec Repair Center for repairs. There are also certain procedures that require
special equipment available only at a Carl Zeiss Meditec Repair Center.

Designated Carl Zeiss Meditec Repair Centers (currently Dublin, California and Jena,
Germany) are the second level of service for the Humphrey Field Analyzer II-i series. The Carl
Zeiss Meditec 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.

Some of the circuit boards in the Humphrey Field Analyzer II-i are multilayer boards and use
Surface Mount Technology (SMT) components. These boards require special equipment and
techniques for troubleshooting and repair.

For Carl Zeiss Meditec U.S. domestic operations, the following Humphrey Field Analyzer II-i
service procedures must be performed at a Carl Zeiss Meditec Repair Center. All other service
procedures (including instrument calibration) can be performed in the field.

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-i Service Call

The basic approach to an HFA II-i 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 Service Bulletin FA2i-026x.

1. Obtain the Before Light Intensity instrument data (Section 4.8.1).

This step assumes that the HFA II-i is operable; that is, it will power up to the Main
Menu without error. This data gives the Field Support Engineer a base from which to
evaluate the light intensity operation of the instrument, and a point of comparison if
recalibration is required.
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.

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The following repairs will affect light intensity data:

$ Hard Drive replacement or initialization;
$ Cleaning or replacement of the ND wedges, color wheel*, or brightness detector;
$ Replacement of the Motor Driver PCB.

* Note

nnnn

Cleaning or replacing the color wheel will not affect the white/white

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 (Section 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 the instrument service has been fully completed (but before reinstalling the
outer covers), a final evaluation of the instrument may be required (see Section 2.3,
System Checkout). During this step, the Before and After light intensity data are
compared (Calibration Shift Worksheet). If necessary, a Measurement Change
Customer Letter is given to the customer.

1.3.3 HFA II-i Field Service Paperwork Requirements

For paperwork guidelines, refer to:

• Service Bulletin FA2i-026x (System Field Service Checklist)

• Customer Care Document CCD-006x (OS Field Service Paperwork Guide)

1.4

Configuration parameters can be entered and stored in the system by the user. This data is
stored on the hard disk. Calibration data also is stored on the hard disk. There is the
possibility that this data may become altered or erased during servicing of the instrument.

To minimize the possibility of altering the calibration values, 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 calibration

values on disk or USB. This option is available via the Calibration Menu.

$ Whenever possible, when servicing a customer's instrument, backup the customer-selected

configuration. This option is available via the Setup and Additional Setup menus.

$ When finished servicing the instrument, restore the customer's configuration selections.

• When applicable, ensure that you check for proper system licenses and networking
configuration.

$ Never intentionally alter the customer's existing doctor setups.

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1.5 Classification / Compliance

Class I Equipment – Protection against electrical shock.

Type B – Degree of protection against electric shock of applied

part (chin, forehead, and patient button).

Ordinary Equipment (IPXO) – Degree of protection against ingress of liquids (none).

CAUTION:

against harmful ingress of water or other liquids (classified IPXO –

ordinary equipment).

Do not place containers of liquid on or near the instrument, and do
not use aerosols on or near it.

Continuous Operation – Mode of operation.

• Not suitable in the presence of flammable anesthetic.

=

Complies with 93/42/EEC Medical Device Directive

=

Complies with US and Canadian medical electrical system safety requirements

=

This instrument has no special measures to protect

=

1.6 System Electrical Information

Instrument Electrical Rating:

• 100 – 120V ~, 50/60 Hz, 4.0A

• 230V ~, 50/60 Hz, 1.8A

Fuse Rating:

• T4A, 250V; (100 – 240V ~)

WARNING: Always replace fuses with the same type and
rating. Failure to do so may create a risk of fire.

Power Table Electrical Rating:

• HFA 120: 120V ~, 60 Hz, 8.0A

• HFA 230: 230V ~, 50 Hz, 6.0A

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Power Outlet Ratings:

• HFA 120: 120V ~, 5A Max.

• HFA 230: 230V ~, 3A Max.

Fuse Rating:

• T8A, 125V; (HFA 120)

• T6.3A, 250V; (HFA 230)

WARNING: Always replace fuses with the same type and
rating. Failure to do so may create a risk of fire.

Duty Cycle:

• Int. 0.8 min/21 min (HFA 120)

• Short-Time-Op 2 min, int. 1 min 19 min (HFA 230)

Load (Lift Mechanism):

• 1000N Push

Protection against ingress of liquid:

1.7 Safety Information

WARNING: Do NOT block the ventilation openings. These allow for
the release of heat generated during operation. A buildup of heat
due to ventilation opening blockage can cause failures which may
result in a fire hazard.

WARNING: To prevent electric shock, the instrument must be
plugged into an earth grounded outlet. Do not remove or
disable the ground pin. Only an authorized Carl Zeiss Meditec

service representative may install the instrument.

WARNING: Do not use the printer or the instrument or the power
table with an extension cord or a power strip (multiple portable
socket outlet). For additional safety, do not plug the printer and

the instrument (or the power table) into the same wall outlet.
Failure to observe this warning could result in electrical shock to
the patient and/or examiner.

WARNING: Do not open the instrument covers. Opening the
instrument covers could expose you to electrical and optical
hazards.

• IP20 (HFA 120)

• IP30 (HFA 230)

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WARNING: if the instrument is externally connected to non­medical peripheral devices (i.e. printer, storage devices, etc.), the
complete system must comply with the system requirements in

standard IEC 60601-1. This standard requires the usage of an
Isolation Transformer to power the non-medical peripheral
device(s) if located within 1.5 m from the patient. If the
peripheral device is located outside the patient environment
(beyond 1.5 m) and is connected to the HFA, a separation device
must be used or there shall be no metal to metal connection
between the non-medical peripheral device and the HFA.

The person or the responsible organization connecting
additional devices or reconfiguring the system must evaluate the
complete system to ensure compliance to the applicable IEC
60601-1 requirements.

The instrument operator must not attempt to touch the patient
and the peripheral device simultaneously.

WARNING: Do not reconfigure system components on the table,
nor add non-system devices or components to the table, nor
replace original system components with substitutes not

approved by Carl Zeiss Meditec. Such actions could result in
failure of the table height adjustment mechanism, instability of
the table, tipping and damage to the instrument, and injury to
operator and patient.

WARNING: This instrument may cause ignition of flammable gases
or vapors. Do NOT use in the presence of flammable anesthetics
such as nitrous oxide, or in the presence of pure oxygen.

WARNING: Avoid tipping. Do not use the instrument on an
uneven or sloped surface. Also, do not roll the table in deep pile
carpet or over objects on the floor such as power cords.

Failure to observe these precautions could result in tipping of
the instrument and/or table and resulting injury to operator or
patient and damage to the instrument.

CAUTION: The appliance coupler is the main disconnect device of the

instrument. Position the instrument in such a way to have easy access to

disconnect the appliance coupler in case of an emergency.

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1.8 Symbols and Labels

=

The following are the symbols (and their definitions) that MAY be found on
the Humphrey Field Analyzer II-i System:

WARNING: Follow instructions for use. Failure to read and follow instructions may result in
hazards that can lead to serious injury. Instructions may also describe potential serious
adverse reactions and safety hazards.

WARNING

WARNING

WARNINGWARNING

CAUTION

CAUTION

CAUTIONCAUTION

CAUTION

CAUTION: Hot

CAUTIONCAUTION

: Hot Surface

Surface

: Hot: Hot

SurfaceSurface

Type B

Type B – Degree of protection against electric shock of applied part (chin and forehead rests).

Type BType B

~

0 I

Alternating Current

Alternating Current

Alternating CurrentAlternating Current

Power

Power Off

Off //// On

Power Power

Off Off

On

On On

Stand By

Stand By

Stand ByStand By

Manufacturer

Manufacturer

ManufacturerManufacturer

Authorized European Community Representative

Authorized European Community Representative

Authorized European Community RepresentativeAuthorized European Community Representative

Serial N

Serial Number

umber

Serial NSerial N

umberumber

Catalog Number / Part Number

Catalog Number / Part Number

Catalog Number / Part NumberCatalog Number / Part Number

Model Number

Model Number

Model NumberModel Number

Fuse

Fuse

Fuse Fuse

=

Complies with 93/42/EEC Medical Device Directive

Complies with 93/42/EEC Medical Device Directive

Complies with 93/42/EEC Medical Device DirectiveComplies with 93/42/EEC Medical Device Directive

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Additional symbols appearing on the HFA II

Additional symbols appearing on the HFA II----iiii::::

Additional symbols appearing on the HFA IIAdditional symbols appearing on the HFA II

=

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1.9 Protective Packing Information / Symbols

The protective packing symbols specify the handling requirements of the instrument.

Handling Requirements

Fragile, Handle with Care

Fragile, Handle with Care

Fragile, Handle with CareFragile, Handle with Care

Keep Dry

Keep Dry

Keep DryKeep Dry

This End Up

This End Up

This End UpThis End Up

=

1.10 Environmental Specifications

Operating Conditions

Operating Temperature: +10° C to +40° C

Relative Humidity: 30% to 75% excluding condensation

Atmospheric Pressure: 700 to 1060 hPa

Max wet bulb: 78°F (26°C)

Storage and Shipping Conditions

Storage Temperature: -40° C to +70° C

Service Manual

Relative Humidity: 10% to 100% including condensation

Atmospheric Pressure: 500 to 1060 hPa

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1.11 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.

1.12 Special Topics

1.12.1 Touch Screen

The HFA II-i 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.

1.12.2 Gaze Tracking

The HFA II-i uses two systems for measuring patient fixation: the standard Heijl-Krakau blind­spot monitoring and the 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 either just under the diamond fixation (new bowl) or to the left of
the central illumination LED (older bowl) and turns off eye illumination briefly. 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 rotates, and thus the marker becomes a (relatively) stationary reference point.

ext, 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 with a dark pupil (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 center that determines fixation (FIGURE 1.4).

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Note

nnnn

When gaze tracking is being initialized, it appears as repetitive "strobing" when

viewed by the operator via the video insert on the HFA II-i 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).

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;

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.

$ 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.

FIGURE 1.1. Location of Corneal Reflex Marker

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FIGURE 1.2. Corneal Reflex Marker Location Digitized and Stored in Memory

FIGURE 1.3. Determining the Pupil Center

FIGURE 1.4. Patient Fixating BBBB FIGURE 1.5. Patient Not Fixating BBBB
Corneal Reflex Marker and Pupil in Corneal Reflex Marker and
Proper Relationship Pupil Not in Proper Relationship

FIGURE 1.6. Gaze Graph

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1.12.3 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 (750-i model only) 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.

Note: If Head Tracking is turned ON, do not adjust the patient alignment using the
Chinrest button. This causes the software to lose its last known tracking position.

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 does not 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 1.12.2 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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1.12.4 HFA II-i Light Intensity Fundamentals

The HFA II-i uses one detector mounted at the end of the turret to measure 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 calibration value 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 calibration values are 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. The projection voltage is
adjusted to match the calibration value stored in memory. 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 10V, 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 "0.5 dB from the stored values, the test will fail and a wedge failure error message will be
displayed.

1.12.5 Comparing the HFA II and HFA II-i

Hardware

The HFA II-i version 5.1 and greater differs from the prior production version, the HFA II, in
that significant upgrades have been made.

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Version ≤5.0 CPU PCB

The HFA II-i Version ≤5.0 uses an off-the-shelf CPU PCB featuring an Intel Celeron 433 MHz
processor, while the HFA II uses a 20 MHz Motorola 68020-based processor. The Version
≤5.0 CPU PCB dramatically decreases the test processing time resulting in significant overall
test time reduction. The HFA II-i CPU PCB contains 64 megabytes of DIMM memory while
the HFA II has 4 megabytes of memory on the current CPU.

Version ≥5.1 CPU PCB

The HFA II-i Version ≥5.1 CPU PCB is an ADLink Computer Board Model “NuPRO­935A/DV”.

Computer Board: The computer board is a PICMG® 1.0 Core™2 Quad/Duo Single Board
Computer, Q35/ICH9, TPM, Dual GbE/ SATA II/ IDE/ Floppy.

• PICMG® 1.0 SBC with Intel® Q35 Chipset, VGA, SATA II, Dual GbE, USB,
IDE, FDD

• Intel® Core™2 Duo/Quad processors

• Intel® Celeron® 440 Processor (512 Cache, 2.0 GHz, 800 MHz FSB)

• Trusted Platform Module

• Dual Intel® Gigabit Ethernet controllers

• 1-GB DDR2 800 Memory Module

Backplane Board

The Backplane board interfaces to the computer board through the ISA Bus. The Backplane
Board provides the following functionality.

1. 5V and 12V power to the computer board. The power pins of the ISA Bus and the
PCI Bus are used.

2. ISA Bus interface to the Computer Board. The PCI connector on the backplane is
used only for mechanical support and supplying power to the computer board.

3. Communication channel from the Computer board to the Motor Board. The ISA Bus
addresses specific to the Motor Board are decoded and the data routed from and to
the Motor Board.

4. Touch Screen interface. Touch Screen calibration is facilitated by the backplane
firmware and touch coordinates are sent to the application software running on the
computer board via the ISA Bus.

5. Patient Button interface. Button clicks are reported to the application software via the
ISA BusEye Monitor Camera image overlay on the screen. The VGA out from the
computer is connected to the backplane. The camera image is sampled synchronous
to the VGA pixel clock and inserted into the video stream in real time.

6. Motor Board Interface to the computer board.

7. VGA output to the screen. The camera image is inserted at the required XY location
and scaling in the video frame and sent to the screen.

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Many of the unique functions that the HFA II CPU PCB supported are now included in the
HFA II-i Backplane PCB. The functions of the Backplane PCB include; the patient switch,
touch screen, camera frame grabber, and video.

For EMI considerations, the HFA II-i CPU PCB and Backplane PCB are housed in a metal
enclosure. The enclosure is bolted to the chassis in the location of the HFA II CPU PCB.

To accommodate the enclosure, the rear cover was redesigned for use on the HFA II-i. The
rear cover does not make use of 1/4 turn fasteners.

External Interfaces

Refer to the NuPRO-935A data sheet for details on the computer board. The following
external user interface connectors are provided by the computer board.

1. Four USB 2.0 ports using the standard Type-A receptacles. One port is on the I/O
panel of the board. Two are adjacent to the computer board on the EMI Box. The
last two are on the front panel of the Drive Bay. Each of the USB ports will source

0.5A at 5V for use by devices connected to the port.

2. One Gigabit Ethernet port (10/100/1000 base-T) on the I/O panel using the standard
Category 5 RJ-45 connector labeled as “Network”.

3. Two RS232 serial ports capable of 115200bps on the EMI Box using the 9-pin D-Sub
connector. One port designated as “Data Transfer” is used for transferring data from
and to the HFA and to connect with peripherals such as an external modem. The
second port as “Auxiliary” may be used for software debugging and diagnostics.

4. One Parallel Port using the 25 pin female D-Sub connector to communicate with
standard printers.

5. One PS/2 Keyboard/Mouse combination port via a Mini-Din 6 pin connector. The
PS/2 Y cable is used to connect a keyboard and a mouse.

6. The VGA output (15 contact high density receptacle) from the computer is connected
to the backplane board. The output VGA connector from the backplane is connected
to the screen.

Motor Board

The Motor Board controls all the internal peripheral components such as the stepper motors,
light sources, the stimulus projection sub-system and the patient support.

Power Supply

The HFA II-i has a larger capacity power supply than the HFA II to provide the additional Vcc
power required for the HFA II-i. The HFA II-i is designed with a power supply that provides:

• 14A nominal at 5V DC

• 8A nominal at 12.5V DC

• 0.5A nominal at –12V DC

• 3A nominal at 24V DC

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Hard Disk Drive

The HFA II-i has an IDE hard drive, while the HFA II uses a SCSI hard drive. Note that the
two drives are not interchangeable.

The Version ≥5.1 hard drive operates at a spindle speed of 5400 RPM. It is SATA-2
compliant. The minimum capacity is 160-GB.

Mass Storage

The DAT streamer tape of the HFA II has been replaced with a magneto-optical medium
reader in the HFA II-i Version ≤5.0. The new HFA II-i drive provides greater long-term
storage of large patient files.

CONNECTOR # 5: USB 2.0 PORT – USB PORT-1

CONNECTOR # 4: VGA OUTPUT –

CONNECTED TO THE BACKPLANE BOARD.

CONNECTOR # 3: GIGABIT ETHERNET PORT –

NETWORK PORT

CONNECTOR # 2: GIGABIT ETHERNET PORT –

UNUSED

CONNECTOR # 1: COMBINATION

KEYBOARD/MOUSE PS/2 CONNECTOR.

FIGURE 1.7. HFA II-i Version ≤5.0 & Version ≥5.1 Interconnects

The external connections to the HFA II-i are considerably different from those of the HFA II.
Two USB and a network port have been added to the ≥5.1 HFA II-i. While the HFA II had
three serial ports, the HFA II-i has only one functional serial port.

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Service Changes

Calibration of the HFA II-i will differ from the HFA II only in the fact that the calibration data will
be stored differently. In the HFA II the calibration data is stored in the EEPROM, located on the
CPU PCB. In the HFA II-i, the calibration data is stored in a file on the hard drive. An
additional copy of the calibration data is stored on a diskette / USB, stored behind the rear cover
door of the instrument. In cases where the calibration file on the hard drive becomes damaged,
the calibration data can be loaded back onto the hard drive via the main calibration menu.

Unlike the HFA II, the HFA II-i has a BIOS that can be modified as needed with future
updates. See Appendix E for BIOS Configuration.

A significant difference between the HFA II and the HFA II-i is that the HFA II operating
system would allow low level formatting of the floppy drives (formatting a previously
unformatted diskette). This is not possible with the HFA II-i. The HFA II-i will only allow

a preformatted diskette to be reformatted. The HFA II-i will not format
unformatted floppy diskettes.

Operational Changes

Startup screen information, such as the model number, hard option code, soft option code,
motor board code and CPU board code, will not be displayed during the bootup process.
This information will be displayed on the Ai@ screen. The model, serial number, operating
system revision, language revision, and hardware option code are found on the Ai@ screen.
See the sample “i@ screen printout in Appendix J.

In all other aspects, field operation of the HFA II-i is essentially identical to the HFA II.

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Section 2 – PM and System Checkout

2.1 Preventive Maintenance ..............................................................................................2-3

2.1.1 HFA II-i Preventive Maintenance Procedure ....................................................2-3

2.2 Operator Maintenance Tasks .......................................................................................2-4

2.3 System Checkout ........................................................................................................2-5

2.3.1 HFA II-i System Checkout Procedure ..............................................................2-7

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Notes:

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2.1 Preventive Maintenance

For U.S. domestic Field Service, an annual preventive maintenance (PM) visit is required for
every HFA II-i instrument under service contract. The PM visit can be combined with a
regular service visit if the timing is suitable. The HFA II-i System Checkout (Section 2.3)
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.

 Check that all external cable and cord connections are secure.
 Check that the instrument is being powered from a properly grounded AC outlet (use

 Observe the ambient conditions in which the instrument is operating:

 Check whether the instrument operator(s) have any questions/comments regarding

 Any customer complaints noted during the PM or service call must be documented in

2.1.1 HFA II-i Preventive Maintenance Procedure

1) Obtain the Before instrument data as prescribed on the Light Intensity worksheets

2) Apply a very thin film of clock oil [P/N 266010-0002-534 (02534)] to the projection

3) After the oil has been applied, proceed to the Motor Exerciser (Section 5) and

4) Check the rail ends and directly beneath the projection assembly for any excess oil.

5) Clean the optics path. Refer to Appendix Q – Care and Cleaning of Optics, for

an AC circuit tester).

• 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.)?

performance of the instrument.

the call details.

detailed in Section 4.8.1.

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.

exercise the F motor (focus/carriage motor). Exercise the focus motor 20 times to
distribute the oil on the rails.

Carefully wipe up any excess oil.

general guidelines.

Note - Cleaning certain elements in the optics path will affect the light
intensity readings of the instrument and thus necessitate recalibration.

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6) Clean the top and bottom air intake filters and the power supply fan:

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.

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.

EMI Box Fan — Gently brush, vacuum, or blow any accumulated dust and debris

off the EMI Box fan and surrounding assembly. Use care to avoid getting dust or
debris on the instrument optics or bowl.

CPU Fan — Open the CPU enclosure and gently brush, vacuum, or blow any

accumulated dust and debris off the EMI Box fan and surrounding assembly. Use
care to avoid getting dust or debris on the instrument optics or bowl.

7) Clean the bowl (see User Manual).

8) Check all belts, and replace as required.

9) Update the system software to the latest revision that the customer is entitled to.

10) With the covers still off, perform the System Checkout (2.3).

Note: Check the CPU battery voltage (in circuit). If the voltage is below 3.0
volts, replace the battery and verify that the CMOS settings are correct as per
Appendix E.

2.2 Operator Maintenance Tasks

Data Storage - Backup

All data stored on the hard disk and any external media are the Purchaser's records, and it is
his or her responsibility to preserve the integrity of these files. Carl Zeiss Meditec is not
responsible for the loss of patient files stored on the hard disk or external media. The
Purchaser assumes the responsibility for the installation, use, and results obtained from the
instrument and programs.

Cleaning the Forehead / Chin Rest

The forehead / chin rest can be cleaned with a disinfectant such as isopropyl alcohol.

WARNING – Strong solvents such as Acetone or Methyl Alcohol will
damage the forehead / chin rest.

Miscellaneous Maintenance

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Other than occasionally cleaning the forehead / chin rest, the system requires no regular
physical maintenance other than periodic cleaning and dusting of the LCD flat screen. The
screen should be wiped with a soft, non-linting cloth. Do not use any cleaning agent on the
screen.

2.3 System Checkout

The Humphrey Field Analyzer II-i system checkout procedure is used to verify that the
instrument is operating properly within specifications. The system checkout should be
performed at the completion of every installation and service call on the 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 must be performed
from start to finish without any problems occurring.

The Humphrey Field Analyzer II-i System Field Service Checklist is a shortened version of the
System Checkout Procedure and is used as a checkout guide for the Field Support Engineer.
The System Field Service Checklist is used to record the results of the system checkout
procedure. The System Field Service Checklist must be filled out during completion of each
Humphrey Field Analyzer System service call (including software upgrades).

Attach the completed System Field Service Checklist in the “Attachments” Assignment Block
of the Service Confirmation.

Notes:

• Refer to Service Bulletin FA2i-026x for the

Humphrey Field Analyzer II-i

System

Field Service Checklist.

• An E-copy with writeable fields of the

Humphrey Field Analyzer II-i

System Field
Service Checklist is located in Lotus Notes in the Service Bulletin folder under
System Field Service Checklists.

• The System Field Service Checklist is provided for U. S. Domestic Field Support
Engineers only.

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Notes:

1. Following any calibration procedure that has calibration values stored, proper
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-i during
calibration are not within an expected range, those values are held only in
temporary storage and not permanently stored. 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 various media. To prevent accidental damage to patient files, it is
recommended that you make up a test media with your own patient data

HFA II-i Configuration

One of the steps during system checkout is to read and record the instrument configuration
information and hardware levels. Current revision levels of the Model, Serial Number,
Operating System, Language, Backplane Version, Motor Board Version, Available Memory,
Software Options and Hard Option Number are displayed on the Unit Configuration Screen
(“i” screen).

The individual version numbers are displayed on the configuration screen in the formats
shown below where XX is the revision level.

Model ......................................................................... XXXi

Serial Number ............................................................ XXX-XXXX

Operating System ....................................................... Rev XX

Language ................................................................... XX

Backplane Version ...................................................... XX

Motor Board Version .................................................. XX:XX:XX:XX:XX:XX

Available Memory ..................................................... XX MB

Hardware Options ...................................................... 00000000 - XXXXXXXX

Software Options ........................................................ XXXXXXXX

You can view/print this information from the Main Menu. Select the “i” icon. The
configuration data appears on the screen. Select Print/Save to capture the configuration data.

The hardware options number corresponds to the model number of the instrument and is
stored in the instrument's configuration file on the Hard Drive. If the hardware options
number is set as a Model 750-i, all software features are enabled. If set for a Model 745-i,
only those features intended for the 745-i are enabled. The same is true for a Model 740-i
and 720-i models.

The hardware options number should be verified during the system checkout procedure.
Refer to Appendix G for specific hardware options numbers.

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:

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For the System Log –

• From the main menu, select System Setup; then select Print/Save System Log. The
hardware options number and instrument serial number are printed on the line titled

For the Cal/Wedge printout –

Machine ID, at the beginning of the printout.

• From the Calibration main menu, select Print/Save Cal Values. The hardware
options number and instrument serial number are visible on the line titled Machine
ID, near the beginning of the printout.

Note: Check the CPU battery voltage (in circuit). If the voltage is below 3.0 volts,
replace the battery and verify that the CMOS settings are correct as per Appendix E.

2.3.1 HFA II-i System Checkout Procedure

Note: Following any calibration procedure that has calibration values
stored in the Cal/Config Data, 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-i 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-i System Checkout 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

This checkout assumes that all required service has been performed on the HFA II-i. Place a
checkmark next to each item when completed. If an item does not apply to the HFA II-i under
service, indicate N/A (not applicable).

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

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Part I -- For All Service Calls (Refer to the above System Checkout 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. (4.8.1.1)

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).

5) Print the System Log printout and then clear the log. Verify that all reported error
conditions have been evaluated / corrected. (Appendix J)

Part II -- (Refer to the above System Checkout Guidelines.)

Calibration Checks —

6) Verify that the white/white light intensities are within the specified tolerances.

7) Verify that the blue/yellow light intensities are within the specified tolerances.

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.

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.

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Operational Checks —

14) Check the CPU battery voltage (in circuit). If the voltage is below 3.0 volts, replace
the battery and verify the CMOS settings are correct as per Appendix E.

15) 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.

16) Check that the external brightness knob moves freely and has additional brightness
range.

17) 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.)

18) Observe the bowl for dirt or other cosmetically unacceptable spots. Clean as
needed.

19) Check the operation of the rear fan, and clean the filter.

20) Check that the date is correct and that the time is correct within 2 minutes.

21) Select a patient test. Change parameters. Verify that the central fixation LED, inner
diamond, and outer diamond all function.

22) Turn foveal threshold on (except Model 720-i). 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.

23) Recall a test from the hard disk. Display and print the test.

24) Recall a patient test from your test media. Display and print the test.

___ 25) Duplicate a patient test from your test media to a formatted floppy / USB drive.

Display the copied test.

26) Copy a patient test from your test media to the hard drive. Delete that test from the
hard disk.

27) Perform a backup using the Magneto-Optical drive / USB drive to verify the
backup/restore procedure.

28) Turn power off/on and wait for the Main Menu. No errors should be reported.

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Section 3 – Parts Removal/Replacement

3.1 General Instructions ................................................................................................ 3-3

3.1.1 Table 3-1 .................................................................................................... 3-6

3.1.2 Removal of the HFA II-i from Power Table ................................................ 3-8

3.2 Front Cover Assembly Removal ............................................................................. 3-9

3.3 Rear Cover Assembly Removal ............................................................................... 3-9

3.4 Operator Panel Assembly Removal....................................................................... 3-10

3.5 Drive Housing Assembly Removal ........................................................................ 3-12

3.6 CPU / Backplane Enclosure Removal ................................................................... 3-14

3.7 CPU / Backplane Removal ................................................................................... 3-15

3.8 Motor Drive PCB Removal ................................................................................... 3-16

3.9 Separation of the CPU from the Backplane .......................................................... 3-17

3.10 Power Supply Removal ........................................................................................ 3-18

3.11 CRT PCB Removal ............................................................................................... 3-18

3.12 CRT Removal ....................................................................................................... 3-19

3.13 Touch Screen Removal ........................................................................................ 3-21

3.14 CCD Camera Removal ......................................................................................... 3-21

3.15 Fixation Interconnect PCB Removal ..................................................................... 3-22

3.16 Central Fixation LED / Beamsplitter Removal ....................................................... 3-23

3.17 Projection Assembly Removal ............................................................................... 3-24

3.18 Projection Interconnect PCB Removal .................................................................. 3-25

3.19 Film Wedge / Motor Removal ............................................................................... 3-26

3.20 Glass Wedge / Motor Removal ............................................................................. 3-26

3.21 Color Wheel / Aperture Wheel Removal ............................................................... 3-27

3.22 Carriage Motor Removal ...................................................................................... 3-29

3.23 Shutter Removal ................................................................................................... 3-29

3.24 Shutter Motor Removal ........................................................................................ 3-30

3.25 Carriage Motor Belt Removal ............................................................................... 3-30

3.26 Horizontal (X-axis) Turret Motor Removal ............................................................ 3-31

3.27 Horizontal (X-axis) Turret Motor Belt Removal ..................................................... 3-31

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3.28 Vertical (Y-axis) Turret Belt / Motor Removal ....................................................... 3-33

3.29 Brightness Detector (PCB) Replacement ............................................................... 3-33

3.30 Lower Turret Removal .......................................................................................... 3-35

3.31 Turret Cable Assembly Removal ........................................................................... 3-35

3.32 Chinrest / Headrest Switch Assembly Removal ..................................................... 3-35

3.33 Chinrest Y-axis Belt / Motor Removal ................................................................... 3-36

3.34 Patient Support Horizontal (X-axis) Belt/Motor Removal ...................................... 3-37

3.35 Chinrest Vertical Slide and Lead Screw Removal ................................................. 3-40

3.36 Chinrest Horizontal Slide Removal ....................................................................... 3-40

3.37 Trial Lens Holder Assembly Removal ................................................................... 3-41

3.38 Top Fan Removal ................................................................................................. 3-43

3.39 Bowl IR LED Assembly Removal .......................................................................... 3-43

3.40 Blue-Yellow Module / Bowl Plug Removal ............................................................ 3-44

3.41 Bowl Removal ...................................................................................................... 3-44

3.42 Reflex Gaze LED Removal ................................................................................... 3-45

3.43 Bowl Lamp Assembly Removal ............................................................................ 3-46

3.44 IR Bowl Plug Removal / Installation ...................................................................... 3-46

3.45 Quarter-Turn Fastener Replacement ..................................................................... 3-47

3.46 System Fuse Replacement .................................................................................... 3-48

3.47 Power Table Fuse Replacement ............................................................................ 3-50

3.48 Stimulus Projection Lamp Replacement ............................................................... 3-52

3.49 Air Intake Filter Replacement ................................................................................ 3-55

Notes:

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3.1 General Instructions

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.

P

NOTICE — BEFORE beginning disassembly of the HFA II-i, be sure that you have

had the customer read and sign the HFA II-i Disclaimer form regarding possible
loss of stored data during servicing of the instrument.

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 instrument are contained in Section 6. Note that

this diagram contains all the cable part numbers.

P In addition to the drawings in this section, the parts drawings in Section 7 provide

useful reference for parts identification and 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 Step-by-step procedures are provided when needed; but, when adequate, only

essential replacement notes are given. Simple removals that are clearly obvious are not
described in this manual.

P Unless noted otherwise, the steps for replacement (reassembly) are simply the reverse

order of the steps 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 In this manual, the terms left, right, front and rear of the instrument are as viewed from

the patient position, unless noted otherwise.

P To facilitate later reassembly of the instrument, consider labeling each connector during

disassembly.

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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 reverse 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-i. Work carefully to avoid damaging or dirtying the bowl.
Do not touch the inside of the bowl unnecessarily.

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).

P Special Tools / Equipment –

Any special tools or equipment required for a procedure are listed at the beginning of

the procedure.

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FIGURE 3.1. Screws Securing Projection Assembly Alignment

P Equipment Return Procedures

When equipment needs to be returned to Carl Zeiss Meditec for repair, it is important

that it is properly packed for shipment, and that authorization for return is obtained
before the equipment is shipped.

When equipment is received, the original packing materials should be preserved for

possible later use. Costs to repair equipment damage caused by improper

packing for shipment to Carl Zeiss Meditec become the responsibility of
the sender.

Authorization must be obtained from Carl Zeiss Meditec before equipment is returned
for repair. A Return Materials Authorization (RMA) number is required on each
return shipment to Carl Zeiss Meditec. The procedure for obtaining an RMA number
varies, depending on your area of operation. Use the procedure that has been
established by Carl Zeiss Meditec for your operating organization.

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3.1.1 Table 3-1

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 in the second column. 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.

Assembly/Part 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 - battery ................ 40, 41

$ Hard Drive 2 ........................... 29, 26, 27, 28, 7, 8, 3, 10, 9,

12, 11, 13, 16, 17, 15, 18,
19, 20, 21, 22, 23, 40

$ CPU/Backplane ..................... 7, 40

$ Flash Prom MDB .................. 29, 40

$ Motor Driver PCB .................. 29, 18, 19, 20, 21, 22, 23,

16, 17, 40

$ Power Supply ....................... 40

$ CRT PCB .............................. 2*, 7*, 40

$ Touch Screen ........................ 7, 40

$ Fixation Interconnect PCB .... 5, 16, 17, 15, 11, 13, 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*3, 40

$ Carriage (Focus) Motor ......... 24, 12, 11, 13, 40

$ Shutter ................................... 8, 40

$ Shutter Motor ........................ 8, 11, 13, 40

Adjustment / Calibration Requirements Following Replacements

Assembly/Part 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*,

$ 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, 114, 134, 40

$ IR Bowl Plug ............................. 40

20*, 21*, 22*, 23*, 40

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Follow-up Actions

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 (4.8.3.3.1 + )
19 - White Projector Intensity Calibration (4.8.3.1.1 + )
20 - Yellow Bowl Intensity Calibration (4.8.3.3.2 + )
21 - Blue Projector Intensity Calibration (4.8.3.1.2 + )
22 - Wedge Calibration (4.8.3.5)
23 - Blue Correction (4.8.3.6)
24 - Belt Tension Adjustment (4.9.2)
25 - Patient Support Horizontal Leadscrew Adj. (4.9.1)
26 - Transfer Calibration Constants (Appx. G.1)
27 - ID CPU (Appx. G.2)
28 - Configure Hardware (Appx. G.3)
29 - Reload Software (Appx.M)

40 - System Checkout (2.3)

41 - Verify CMOS settings (5.11)

Notes -

1. Adjustment/calibration not required when
projection lamp is replaced by customer.

2. Only if the Calibration constants diskette is not

restorable.

3. Only blue calibration required if color wheel is

replaced. Both white and blue projector calibration
required if aperture wheel is replaced.

4. 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.

+ According to the Light Meter used:

• 4.8.3.1.1 or 4.8.3.2.1

• 4.8.3.1.2 or 4.8.3.2.2

• 4.8.3.3.1 or 4.8.3.4.1

• 4.8.3.3.2 or 4.8.3.4.2

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3.1.2 Removal of the HFA II-i from the Power Table

A number of parts removal and assemblies will require that the HFA II-i instrument be
removed from the power table top prior to accomplishing further removals and
assemblies.

Note: If the slider is not present, only screws at locations A and B are accessed/removed
beneath the table via through holes.

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-i) aligns
with the hole in the left rear HFA II-i foot.

6) Loosen and remove the screw (B) securing the left rear foot of the HFA II-i.

7) Position the HFA II-i such that the 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 (A) securing the front right foot of the
HFA II-i. Access to the screw is from the hole on the bottom of the slider assembly.

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FIGURE 3.2. Removal from Slider

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3.2 Front Cover Assembly Removal

Note

nnnn

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.

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.

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) Remove the two screws located near the top of the rear cover assembly.

6) Remove the two screws that were exposed by removing the fan filter door.

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7) Remove the four screws located along the bottom and side of the rear cover
assembly.

CAUTION

CCCC

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 moves freely.

Follow-up Checks/Adjustments:

See Table 3-1.

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) Remove the three screws that secure the CRT bracket clamp.

6) 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;

P remove the CPU enclosure lid and then disconnect the touch screen ribbon

cable from connector JTS on the Backplane PCB.

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7) Remove the disk/MO/USB drive cables from their clip(s) on the inside of the
operator panel assembly.

8) Remove the two screws located at the two bottom corners on the backside of the
operator panel assembly (FIGURE 3.3). These two screws secure the bottom of
the operator panel to the instrument chassis.

9) 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.)

10) Remove the operator panel assembly by manipulating it up slightly and to the left
while pulling straight out.

FIGURE 3.3. Operator Panel Bottom Mounting Screws

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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.

Follow-up Checks/Adjustments:

See Table 3-1.

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.

a) Using both hands, place your fingers along the bottom edge of the drive

4) Remove the front panel from around the drive housing assembly in the following manner:

housing front panel.

b) 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.

CAUTION

damage to the circuit board on the bottom drive.

a) From below the instrument, insert a small diameter tool (such as a hex ball

driver C 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 3.4). Insert the tool until it touches the plastic tab
securing the bottom edge of the bezel.

CAUTION

and damage the bottom drive circuit board.

CCCC

This step must be performed carefully to avoid possible

CCCC

If the tool is inserted with the tip tilted rearward, it may contact

To unlatch the bezel, push the tip of the tool against the latch as you move the
handle of the tool rearward (FIGURE 3.4).

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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.

7) Disconnect the cables and power connectors from the drives.

FIGURE 3.4. Unlatching the Drive Housing Bezel

Replacement Notes:

P Before installing a new drive, verify that it is strapped correctly [Refer to Service

Bulletin FA2i-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 application

software, and restore configuration and calibration data. If the calibration backup
diskette is not available, a complete system calibration is required. Patient data
will need to be restored, preferably by the customer.

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 / Backplane Enclosure Removal

1) Disconnect the printer, COM1, COM2, keyboard, mouse, external VGA, Ethernet
and USB connections from the connectors located on the outside of the
CPU/Backplane Enclosure right side.

2) Remove the three 2.50 mm screws and washers that secure the top left bracket to
CPU/Backplane Enclosure and to the chassis.

3) Remove the four 2.50 mm screws and washers from the enclosure lid.

4) Remove touch screen cable connector and patient switch cable connector from the
left side of the Backplane board.

5) Remove the drive lamp LED connector from the bottom of the J12 connector on the
CPU board. Note that the two wires connect to the bottom two pins of the connector.

6) Slip the touch screen and patient switch cables from the wire clamp on the left
inside wall of the CPU/Backplane Enclosure.

7) Slightly compress and remove the snap bushing from the top left corner of the
CPU/Backplane Enclosure.

8) Slide the touch screen and patient switch cables out of the CPU/Backplane
Enclosure through the slot.

9) Remove the CRT and POWER connectors from the backplane board.

10) Remove the JXVID and JMPS connectors from the backplane board.

11) Remove the two 2.50 mm screws and cable clamp that secure the IDE/SATA/USB/
Floppy and video cables to the top of the CPU/Backplane Enclosure.

12) Remove the inner front screw of the top fan assembly and the Ferrite clamp screw
that secure the ferrite clamp to the top of the CPU/Backplane Enclosure.

13) Remove the Floppy drive and IDE/SATA cable connectors from the top ride side of
the CPU board.

14) Remove the ferrite clamp and attached cables from the CPU/Backplane Enclosure

15) Loosen and release the captive screw on the left side of the bottom
CPU/Backplane Enclosure bracket.

16) Loosen the captive screws on the right side of the bottom bracket.

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17) Loosen the M3 screw that secures the right side bracket to the CPU/Backplane
Enclosure.

18) Loosen and disconnect the 1/4 turn fastener from the retainer at the top of the
CPU/Backplane Enclosure.

19) Disconnect the brightness pot cable from the brightness pot assembly.

20) Swing the CPU/Backplane Enclosure out from the chassis just enough to allow
access to the wire saddles on the back of the CPU/Backplane Enclosure.

21) Remove the brightness pot cable from the wire saddle located on the back side of
the CPU/Backplane Enclosure.

22) Remove the patient switch cable from the two wire saddles on the back of the
CPU/Backplane Enclosure and place the cables free of the CPU/Backplane
Enclosure.

23) While supporting the weight of the CPU/Backplane Enclosure, loosen and remove
the right side captive screw on the bottom bracket.

Follow-up Checks/Adjustments:

See Table 3-1.

3.7 CPU / Backplane Removal

Note - Only replace the complete CPU Enclosure.

1) Remove the front cover assembly (3.2).

2) Remove the rear cover assembly (3.3).

3) Remove the CPU/Backplane Enclosure from the Chassis (3.6).

4) Remove the three M3 screws that secure the external CPU PCB clamp to the
outside of the CPU/Backplane Enclosure.

5) Remove the external CPU PCB clamp from the CPU/Backplane Enclosure.

6) Disconnect the two serial port connections from the J9 and J10 connectors on the
CPU PCB.

7) Disconnect the parallel port connection from the J7 connector on the CPU PCB.

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8) Disconnect the USB cable connector from the J16 connector of the CPU PCB.

9) Remove the two M3 internal CPU PCB clamp screws.

10) Remove the clamp up through the top corner hole of the CPU/Backplane
Enclosure.

11) Remove the five M3 screws that secure the Backplane board to the bottom of the
CPU/Backplane Enclosure.

12) Remove the upper fan connector.

13) Remove the CPU PCB and Backplane board as a unit from the CPU/Backplane
Enclosure.

Follow-up Checks/Adjustments:

See Table 3-1.

3.8 Motor Driver PCB Removal

1) Remove the front cover assembly (3.2).

2) Remove the rear cover assembly (3.3).

3) Disconnect the camera cable connector from the P14 connector located in the
lower left side of the Motor Driver Board (MDB).

4) Disconnect the chinrest motor cable connector from the P5 connector located at
the upper left corner of the MDB.

5) Disconnect the Projection Interconnect cables from the P1 and P2 connectors
located at the top of the MDB.

6) Disconnect the projection lamp cable and the yellow lamp cable connectors from
the P3 and P4 connectors located on the top right side of the MDB.

7) Disconnect the Fixation Interface Board cable connector at the P7 connector
located in the top right corner of the MDB.

8) Disconnect the Chinrest Interface Board cable connector at the P10 connector
located on the top right side of the MDB.

9) Disconnect the JXVID ribbon cable connector at the P13 connector located in the
lower right side of the MDB.

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10) Remove the three screws and right side bracket that secure the CPU/Backplane
Enclosure to the chassis.

11) Disconnect the DC Distribution cable from the bottom of the backside of the MDB.

12) Remove the six 3.0 mm screws securing the Motor Driver PCB to the chassis.

13) Slide the MDB to the right and disconnect the JMPS ribbon cable connector at the
P15 connector located in the bottom of the middle of the MDB.

14) 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.

3.9 Separation of the CPU from the Backplane

Note

nnnn

Replace the Complete CPU/Backplane Enclosure!

Improper attempts at separation of the Backplane board and Processor board can
result in irreparable damage to the backplane board or processor board.

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3.10 Power Supply Removal

Note

nnnn

The power supply used on the HFA II-i is different from that of the HFA II.
Do not remove the keys found in the power supply output cables. Do not attempt to
use the HFA II power supply.

1) Lower the power table to its lowest position and lock the table top in its center

position.

2) Remove the front cover assembly (3.2).

3) Remove the rear cover assembly (3.3).

4) Ensure that the power cord is disconnected.

5) Disconnect the two large connectors from the power supply.

6) Remove the two 3.0 mm screws securing the power supply assembly.

7) Lift 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.)

8) With a screwdriver, unfasten the two AC supply lines and ground wire attached to

the power supply.

9) Remove the power supply.

Replacement Notes:

P Reconnect the three input wires before reinstalling the power supply assembly.

Follow-up Checks/Adjustments:

See Table 3-1.

3.11 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.

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3) Disconnect:

P the yoke connector 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 lies 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.

3.12 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 connector from the CRT PCB.

P the connector at the end of the CRT neck.

4) Remove the 3.0 mm screw (item 1, FIGURE 3.5) at each corner of the CRT bracket.

5) Remove the CRT assembly from the operator panel.

6) Remove the four 3.0 mm screws (item 2, FIGURE 3.5) 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 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 OVER TIGHTEN. If the gaskets are over compressed,
the touch screen surface will be pressed against the operator panel bezel and the
instrument will malfunction.

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P 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, and the CRT

anode lead routed over the top of the CRT neck. If the lead passes under the neck
of the CRT, it lies next to the bowl and the electrostatic field around the lead will
attract dust to the inside of the bowl.

P The connector at the end of the CRT neck is not keyed, be careful to position it

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.

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FIGURE 3.5. CRT / Touch Screen Removal

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3.13 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 3.5) at each corner of the CRT bracket.

4) Remove the CRT assembly from the operator panel.

5) Remove the two 3.0 mm screws (item 3, FIGURE 3.5) 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 lies 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.

3.14 CCD Camera Removal

1) Remove the front cover assembly (3.2).

2) Remove the rear cover assembly (3.3).

3) Remove the camera cable from the P14 connector of the motor driver board.

4) Loosen the two captive screws securing the camera to the Camera Mount.

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5) Make note of the lens setting, for reference during reassembly.

6) Remove the camera from the Camera Mount.

Replacement Notes:

P 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-i 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.

Follow-up Checks/Adjustments:

See Table 3-1.

3.15 Fixation Interconnect PCB Removal

1) Remove the front cover assembly (3.2).

2) Remove the rear cover assembly (3.3).

3) Remove the camera assembly (3.14).

4) Remove the bowl lamp connectors from P1 and P2 of the fixation interconnect PCB.

5) Remove the IR LED connectors from P3 and P4 of the fixation interconnect PCB.

6) Remove the ribbon cable from P5 connector of the fixation interconnect PCB.

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.

9) Loosen the 3.0 mm screw at the top of the Camera Mount and remove the two 3.0

mm 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. If

you are replacing the Fixation PCB, you must cut the tie-wrap and remove the
Reflex LED from the Reflex LED holder.

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Replacement Notes:

P When re-inserting the Central Fixation 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.

P The Reflex LED holder will be re-used with the new Fixation PCB. Make sure that

you tie-wrap the new Reflex LED to the Reflex LED holder.

Follow-up Checks/Adjustments:

See Table 3-1.

3.16 Central Fixation LED / Beamsplitter Removal

1) Remove the CCD camera (3.14).

2) 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.

3) Press a small screw driver against the flat side of the beamsplitter clip and lift the

clip upwards.

4) Remove the beamsplitter from the mount. When working with the beamsplitter,

make sure that you do not get fingerprints on its surfaces.

Replacement Notes:

P To secure the beamsplitter in place, place the hooks, on the open side of the

beamsplitter clip, in the slots and press down on the flat side of the clip.

P When re-inserting the Central Fixation 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.

P Refer also to the camera replacement notes in Section 3.12.

Follow-up Checks/Adjustments:

See Table 3-1.

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3.17 Projection Assembly Removal

CAUTION

CCCC

The aperture wheel and ND wedges on the projection

assembly are delicate and easily damaged C 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) Loosen the M3 screw holding the finger guard/baffle plate just behind the

film wedge [as required] (FIGURE 3.6). 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 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.

6) Remove the two M4 screws located at the top front of the bowl assembly.

7) Rotate the turret assembly to position the turret Y-motor towards the front.

FIGURE 3.6. Removing the Finger Guard / Baffle Plate

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8) Move the aperture wheel/color wheel carriage all the way forward, towards the first

projection mirror.

Note

nnnn

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
(3/8") on the projection assembly.

9) Lift the projection assembly up and out as you maneuver the turret through the
hole in the bowl assembly.

10) Install the projection assembly on the projection mount tool.

Replacement Notes:

P Check/clean the optics as necessary before reinstalling the projection assembly.

Follow-up Checks/Adjustments:

See Table 3-1.

3.18 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 M3 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.

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3.19 Film Wedge / Motor Removal

CAUTION

are delicate and easily damaged C 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.

CCCC

The aperture wheel and ND wedges on the projection assembly

1) Remove the front and rear covers (3.2, 3.3).

2) Remove the M3 screw securing the bracket that covers the film wedge motor.

3) Remove the two M3 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 M3 screws securing the film wedge motor to the projection
assembly.

Note

nnnn

If washers between the motor and the frame are present they must be

reinstalled.

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.

3.20 Glass Wedge / Motor Removal

1) Remove the front and rear covers (3.2, 3.3).

2) Remove the two M3 screws and standoffs that mount the finger guard bracket to
the Projector Interconnect PCB.

3) Disconnect all cables from the Projector Interconnect PCB.

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4) Remove the two remaining M3 screws securing the Projector Interconnect PCB
and remove the board.

5) Remove the projection lamp assembly.

6) Remove the film wedge.

7) Remove the M3 screw holding the edge detector for the glass wedge. Push the
edge detector down and away from the glass wedge.

8) Loosen the two M3 setscrews holding the glass wedge to the motor shaft, and
remove the wedge.

9) Remove the four M3 screws securing the glass wedge motor, and remove the
motor.

Note

nnnn

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.

3.21 Color Wheel / Aperture Wheel Removal

Note

nnnn

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) Remove the two socket head M3 screws holding the carriage assembly to the
carriage rail block (FIGURE 3.7). 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.

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FIGURE 3.7. Color Wheel / Aperture Wheel Removal

CAUTION

released. Note their relative positions so that you will be able to reinstall them
in the same order as removed.

CCCC

In the next steps, several wavy washers and flat washers will be

4) 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:

5) 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:

P Ensure that the washers are reinstalled on the shaft(s) in the same order as

removed (FIGURE 3.7).

Follow-up Checks/Adjustments:

See Table 3-1.

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3.22 Carriage Motor Removal

1) Remove the Projection Interconnect PCB (3.18).

2) Loosen the four M3 screws securing the carriage motor to the projection assembly.

3) Remove the projection assembly, using all necessary precautions (3.17).

4) Cut any cable ties securing the carriage motor cable.

5) Remove the four loosened M3 screws holding the motor in place, and remove the
motor.

6) Loosen the two M3 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.

3.23 Shutter Removal

CAUTION

damaged.

1) Switch ON the HFA II-i. Proceed to the shutter calibration menu. Select OPEN
shutter. Do not make any other selections.

2) Remove the front and rear covers (3.2, 3.3).

3) Loosen the two M3 setscrews holding the ND film wedge to its shaft, and remove
the wedge. (Use care to not bend the film wedge and to not get fingerprints or
marks on the film surface.)

4) Observe the current position of the shutter. The shutter should later be installed at
the same position C this is very important!

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CCCC

Handle the shutter carefully! It is delicate and easily deformed or

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5) Loosen the M3 setscrew that secures the shutter to the motor shaft. Gently angle
the shutter, and remove it 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.

P Put the shutter in the same position you observed during removal, before securing

it to the motor shaft.

Follow-up Checks/Adjustments:

See Table 3-1.

3.24 Shutter Motor Removal

1) Remove the projection assembly and install it on the projection mount tool (3.17).

2) Disconnect the shutter cable (P6) from the Projector Interconnect PCB (cut the
cable ties if necessary).

3) Remove the two M3 screws securing the shutter motor to the projection assembly,
and remove the motor.

4) Loosen the M3 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.

3.25 Carriage Motor Belt Removal

1) Loosen the four M3 screws securing the carriage motor to the projection
assembly.

2) Remove the two small M3 screws securing the belt plate against the belt.

3) Remove the belt.

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Replacement Notes:

P Adjust the belt tension (Section 4).

Follow-up Checks/Adjustments:

See Table 3-1.

3.26 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 (3.17).

4) Remove the four M3 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 M3 setscrews on the hub/pulley and remove it from the motor
shaft.

Replacement Notes:

P Adjust the belt tension (Section 4).

Follow-up Checks/Adjustments:

See Table 3-1.

3.27 Horizontal (X-axis) Turret Motor Belt Removal

1) Remove the projection assembly and install it on the projection mount tool (3.17).

Note

nnnn

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
(3/8") on the projection assembly.

2) Carefully slide the X-axis turret motor belt off the large gear at the top of the turret.

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FIGURE 3.8. 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).

(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

nnnn

Be careful to prevent dust or debris from reaching the internal optics

of the turret while the turret is open.

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 When the three turret screws have been tightened, secure each one with a small

dab of Loctite7 No. 222 (see Appendix A for part number).

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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.

3.28 Vertical (Y-axis) Turret Belt / Motor Removal

CAUTION

CCCC

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 M3 screws securing the Y-axis motor cable bracket.

4) Disconnect the motor cable at the connector.

5) Loosen the two M3 setscrews on the motor pulley and remove it from the shaft.

6) Remove the four M3 screws securing the Y-axis motor to the turret assembly.

7) Remove the Y-axis motor.

Replacement Notes:

P Adjust the belt tension (Section 4).

Follow-up Checks/Adjustments:

See Table 3-1.

3.29 Brightness Detector (PCB) Replacement

Note – Variations to Figure 3.9 may be seen. This figure depicts the ideal
configuration. Refer to service bulletins for variation.

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 3.9).

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CAUTION

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 M3 screws exposed in step 2 (see FIGURE 3.9).

CAUTION

use care to not invert the detector housing, otherwise the small optics may fall

out.

5) Remove the Brightness Detector PCB.

CCCC

Do Not loosen or remove the screws that secure the detector

CCCC

Once the Brightness Detector PCB is removed in the next step,

FIGURE 3.9. Brightness Detector Removal

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 3.9).

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Follow-up Checks/Adjustments:

See Table 3-1.

3.30 Lower Turret Removal

1) Remove the front cover (3.2).

2) Remove two M4 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.

3.31 Turret Cable Assembly Removal

Replacement Notes:

P If a turret cable requires replacement, all three cables must be replaced as an

assembly.

CAUTION

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.

CCCC

Before removal of the old cable assembly, carefully note cable

3.32 Chinrest / Headrest Switch Assembly Removal

1) Remove the operator panel (3.4).

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2) Remove the three M4 screws securing the chinrest switch assembly bracket.

3) Remove the chinrest switch assembly.

Replacement Notes:

P None

Follow-up Checks/Adjustments:

See Table 3-1.

3.33 Chinrest Y-axis Belt / Motor Removal

Belt:

1) Remove the front cover (3.2).

2) Remove the four M4 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 M4 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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3.34 Patient Support Horizontal (X-axis) Belt / Motor Removal

Note

nnnn

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 3.10).

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 M4 screws securing the chinrest assembly to the front cover
assembly (FIGURE 3.10).

2) Remove the chinrest assembly.

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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 M3 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 M4 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 3.11 for routing
of cables and locations of cable ties).

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Follow-up Checks/Adjustments:

See Table 3-1.

Note: Dotted line indicates cable lies behind
object shown in foreground.

Note: The cable emerging
from base of trial lens holder
must have adequate slack for
lowering the trial lens holder.

FIGURE 3.12. Trial Lens Assembly Cable Routing and Cable Ties

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3.35 Chinrest Vertical Slide and Lead Screw Removal

1) Remove the front cover (3.2).

2) Remove the four M4 screws securing the chinrest assembly to the front cover
(FIGURE 3.10), and remove the assembly.

3) Remove the plastic chinrest (2 - M4 screws).

4) Remove the chinrest cover bracket (2 - M4 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.

3.36 Chinrest Horizontal Slide Removal

1) Remove the front cover (3.2).

2) Remove the four M4 screws securing the chinrest assembly to the front cover
(FIGURE 3.10).

3) Remove the two M4 screws holding the trial lens trap.

4) Remove the two M4 screws holding the stationary part of the horizontal slide.

5) Remove the two M4 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).

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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.

3.37 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 M4 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:

6) Hold the pivot block against the main patient support bracket, and remove the

7) Once the pivot screw has been removed, slowly raise the pivot block and catch

CAUTION

CCCC

A captive steel ball and compression spring will fall loose

as the pivot block is removed (FIGURE 3.13).

pivot screw from the trial lens holder (FIGURE 3.13).

the steel ball and compression spring as they are released.

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FIGURE 3.13. Pivot Block Removal

Replacement Notes:

P Be sure that the steel ball and compression spring are in place before securing

the pivot block.

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 over-compressed and preventing proper movement of the flag.

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 alignment.

Follow-up Checks/Adjustments:

See Table 3-1.

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3.38 Top Fan Removal

1) Remove front and rear covers (3.2, 3.3).

2) Unplug the fan cable.

3) Remove the two M3 screws attaching the fan bracket to the chassis.

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.

3.39 Bowl IR LED Assembly Removal

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 baffle and the bottom of the bowl.

Replacement Notes:

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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3.40 Blue-Yellow Module / Bowl Plug Removal

This procedure is for removing the Blue-Yellow module in units equipped with the Blue­Yellow 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 two M4 screws and washers securing the Blue-Yellow module or
unsnap the Blue-Yellow bowl plug from the bowl.

3) Lift out the Blue-Yellow module or bowl plug from the top of the bowl.

Replacement Notes:

P Make sure that no light is entering the bowl after reinstalling assembly.

Follow-up Checks/Adjustments:

See Table 3-1.

3.41 Bowl Removal

CAUTION

CCCC

Be careful not to damage or dirty the bowl.

1) Remove the front and rear cover assemblies (3.2, 3.3).

2) Remove the projection assembly (3.17).

3) Remove the blue-yellow module (if so equipped) or blue-yellow bowl plug (3.40).

4) Remove the four M4 screws securing the front of the bowl to the chassis.

5) Disconnect:

P The ribbon cable on the Fixation Interconnect PCB.

P Camera cable from the lower-left corner of the Motor Driver PCB. (This is the

6) Remove the screw that secures the chassis end of the ground wire that comes from the

cable from the camera PCB.)

P The power Connector on the backside of the Motor Driver PCB.

right-hand bowl lamp assembly.

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7) Remove two M4 screws securing the left end of the air baffle located below the bowl.

CAUTION

catching on cables behind the bowl and the IR LEDs from catching on the

lower front baffles.

8) Flex the baffle outward. While holding out on the baffle, lift the bowl until it clears
the chassis on the left side, then move the top of the bowl outward and lift it out of
the instrument.

9) If a new bowl is going to be installed, note how the wires are routed and taped on
the old bowl before you begin stripping it.

Replacement Notes:

P A replacement bowl comes completely stripped. (See procedure 3.44 for installation

of the IR bowl plugs on Models 720-i.)

P On a replacement bowl, secure the wires to the backside of the bowl as they were on

the original bowl.

P Make sure the foam gaskets are properly seated between the bowl and the fan

housing of the top fan.

P When reinstalling the bowl, carefully guide the end of the camera past the DC power

harness in the instrument chassis.

Replacement Notes:

P None

Follow-up Checks/Adjustments:

See Table 3-1.

CCCC

In the next step, watch closely to prevent the camera from

3.42 Reflex Gaze LED Removal

The Reflex Gaze LED is part of the Fixation Interconnect PCB.
(See Fixation Interconnect PCB removal, Section 3.15)

Note

nnnn

The reflex gaze LED is used in the Model 720-i for additional eye
illumination to help differentiate the iris and pupil in the video insert for patients
with a dark iris. In the Models 740-i and 750-i, the reflex gaze LED is used to
monitor gaze tracking.

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3.43 Bowl Lamp Assembly Removal

1) Remove the front cover assembly (3.2).

2) Remove the rear cover assembly (3.3).

3) Loosen the four bowl mounting screws to relax the bowl.

4) Unplug the right/left bowl lamp connector from the Fixation Interconnect PCB.

5) Remove the tape securing the bowl lamp cable to the bowl.

6) Remove the hex head screw securing the ground cable to the frame.

7) Remove the two hex head screws (inside the bowl) securing the lamp assembly to
the bowl.

8) For Right Bowl Lamp: Remove the complete lamp assembly by lifting up and

For Left Bowl Lamp: Remove the complete lamp assembly by lifting up and

maneuvering it out from the front of the instrument, between the bowl and frame.

maneuvering it out from the back of the instrument, between the bowl and frame.

Replacement Notes:

P

The bowl lamps must be replaced in pairs only.

P

The bowl lamp baffles snap into place.

Follow-up Checks/Adjustments:

See Table 3-1.

3.44 IR Bowl Plug Removal / Installation

1) Remove the two M4 screws holding the IR Illumination Plug Bracket to the bowl.

2) When installing the IR Bowl Plug, you must rotate the plug until it=s contoured tip is
flush with the inner surface of the bowl before tightening the screw that holds it to
the bracket.

Replacement Notes:

P None

Follow-up Checks/Adjustments:

See Table 3-1.

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3.45 Quarter-Turn Fastener Replacement

The 1/4-turn fastener consists of a 1/4-turn stud and an anchor. The stud is commonly
captured in place by a small plastic washer. The anchor is held in place by an internal,
spring-loaded tab at the upper (outer) end of the anchor.

If it becomes necessary to replace the anchor, proceed as follows.

To remove the anchor:

1) Insert a 1/4"-wide screwdriver blade into the two small slots in the spring-loaded tab
at the upper end of the anchor.

2) Push in on the tab with the screwdriver and turn it 1/8 turn counterclockwise, to
latch the tab in its install/remove position. Remove the screwdriver and push the
anchor out towards the front.

To install the anchor:

3) Make sure that the spring-loaded tab inside the anchor is latched in its install/remove
position (1/8 turn counterclockwise), then insert the anchor into its hole in the
assembly.

4) Insert a 1/4"-wide screwdriver blade into the two small slots in the spring-loaded tab.

5) Push in on the tab with the screwdriver and turn it 1/8 turn clockwise to its anchored
position. Remove the screwdriver and check that the anchor is properly secured in
place.

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3.46 System Fuse Replacement

Two fuses are located in the rear of the unit.

CAUTION: Carefully follow these instructions to safely replace the system
fuses. Always power down the system and unplug the power cord before
proceeding. At all times, use the minimum force necessary to accomplish

each step so as to prevent damage or injury.

1. Power down the system. Unplug the power cord at both ends, for

safety and easy access.

Figure 3.14.

2. Using a narrow-bladed screwdriver, gently pry open the power entry

module fuse holder to expose and remove the fuse holder assembly.

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Figure 3.15.

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3. Slide out each fuse holder (marked with an arrow) and check the

filament for breakage.

Figure 3.16

Fuse type and rating for both system fuses:

• T4A, 250V; (100 – 240V ~)

WARNING: Always replace fuses with the same type and
rating. Failure to do so may create a risk of fire.

4. Insert the new fuse(s) in the holder(s). Slide the holders back into the

housing with white arrows pointing to the right. Push the cover up and
in until it snaps closed.

Figure 3.17.

5. Plug in the power cord at both ends.

6. Your system is now ready to be powered on.

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3.47 Power Table Fuse Replacement

Note: HFA 120 & HFA 230 Power Table only.

Two fuses are located just below the table power cord inlet, near the floor.

CAUTION: Carefully follow these instructions to safely replace the

table fuses. Always power down the table and unplug the power cord
before proceeding. At all times, use the minimum force necessary to
accomplish each step so as to prevent damage or injury.

1. Power down the table. Unplug the table power cord at both ends, for

safety and easy access.

Figure 3.18. Table power entry module / fuse holder assembly

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Figure 3.19. Removing the fuse holder assembly

2. The fuse holder can be removed out of the housing by grasping it while
pressing down on the center tab of the fuse holder and firmly pulling
out.

3. Check both fuse filaments for breakage.

Fuse type and rating for both system fuses:

• T8A, 125V; (HFA 120)

• T6.3A, 250V; (HFA 230)

WARNING: Always replace fuses with the same type and
rating. Failure to do so may create a risk of fire.

4. Insert the new fuse in the holder. Slide the holder back into the
housing until it snaps closed.

5. Plug in the power cord at both ends.

6. Your table is now ready to be powered on.

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3.48 Stimulus Projection Lamp Replacement

This lamp is responsible for projecting the standard light stimulus.
With the aid of color filters, it is also used to create red and blue
stimuli for color testing. If needed, you may order a new lamp by
calling the Carl Zeiss Meditec Parts Department and asking for:

P/N 266002-1106-082 (Projection Lamp).

1. Turn off the HFA II-i and lower the table.

2. To remove the top access panel, rotate it counterclockwise

until you align the lamp symbol on the cover with the raised
dot that is molded into the top of the case.

Figure 3.20.

3. Standing in front of the bowl opening, you will find that the

projection lamp is located inside the open case top, at the 12
o’clock position.

Figure 3.21.

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CAUTION: Allow the lamp to cool completely

(approximately five minutes) before handling it.

CAUTION:

Do NOT touch the two disk-shaped filters.

4. Remove the connector cable by pulling its connector straight

upward. Then use a screwdriver to loosen the screw.

Figure 3.22. Connector Removal

5. Now, slide the wishbone-shaped plate that holds the lamp

assembly in place away from you.

Figure 3.23.

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6. Remove the old expended lamp assembly. Insert the

replacement lamp into the housing. Note the notch in the
base of the lamp housing lines up with the pin to the right of
the assembly.

Note: Do NOT touch the glass part of the lamp with your fingers,
as this will shorten the life expectancy of the lamp. If your finger
touches the glass portion of the lamp, wipe the lamp clean with a
soft cloth.

Figure 3.24.

7. Slide plate back into position, tighten screw and replace

connector cable.

Figure 3.25.

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8. To replace the top access panel, insert the panel into the

opening. As you do so, align the lamp image on the lid with
the raised dot on the underlying case. Rotate the panel
clockwise until the lamp symbol aligns with the open-circle
symbol.

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