Zeiss Humphrey FDT User manual

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HUMPHREY

Eye Care Menu

Operator Manual

Note: Drawings and Schematics are not available in this revision.

FDT Visual Field Instrument

SERVICE MANUAL

Part Number 112120 Revision B October 1997

Includes CE Model

Welch Allyn Inc.

Part No Rev

Description ECN # Date Approved

112120 A New Release of FDT Service Manual 5-36180 8/22/97 RJS

112120 B

Added CE version Section 9 , Calibration

Limits and Error Messages.

5-36574 10/21/97 RJS

DRAWINGS AND / OR ILLUSTRATIONS AND / OR PART NUMBERS

CONTAINED IN THIS DOCUMENT ARE FOR REFERENCE PURPOSES

ONLY! FOR CURRENT REVISIONS CALL HUMPHREY INSTRUMENTS

CUSTOMER SERVICE

ii HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Contents

Section 1: General Information

About The 710 Series and the CE Model 1 Help Information CUSTOMER SERVICE PHONE NUMBER 2 Important Safety Warnings and Service Notes 3 Main Menu Architecture Ver.2.10 5 Hardware System Wiring Block Diagram 6 System Function Electrical Architecture Block Diagram 7

Section 2: Service

Incoming Inspection 1 Tools Required for Service and Factory Calibration and Software Uploading 2 Factory Calibration for Software Version 1.20 or Higher 3 Loading Software for FDT 5 Final Testing 6 Hypot Ground Continuity, and Leakage Current Testing 11 Important Shipping Information 12 Calibration Limits Information 13 Product Updates 15

Section 3: Troubleshooting

Chief Complaint, Cause, Corrective Action 1 Power On Self Test (P.O.S.T.) Status Table 3 FDT Terminology 4 FDT Error Messages 5

Section 4: Disassembly and Repair

4.1 Removal of Rear Housing/LCD Assembly 1

4.2 Replacement of Rear Housing/LCD Assembly 3

4.3 Disassembly of Optics 3

4.4 Assembly of Optics 11

4.5 Removal of Printer 15

4.6 Installing Printer 16

4.7 Removal of MCU/ PCB 17

4.8 Installing MCU/PCB 19

4.9 Installing a Replacement Chassis/Monitor Assembly 20

4.10 Removal of Transformer 20

4.11 Installing Transformer 21

4.12 Removal of PRB Jack 21

4.13 Replacement of PRB Jack 21

4.14 Removal of Power Entry Module 21

4.15 Replacement of Power Entry Module 22

4.16 Removal of Visor Position Sensor (VPS) 22

4.17 Replacement of VPS 22

4.18 Removal of Internal Photodetector (IP) 23

4.19 Replacement of IP / PCB 23

4.20 Removal of LCD Module/Keypad 23

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT iii

Section 4: Disassembly and Repair Cont’d

4.21 Replacement of LCD Module/Keypad 24

4.22 Removal of Visor Pad 24

4.23 Installing Visor Pad 25

4.24 Removal of Acrylic Lenses and Optics Tube Window 25

4.25 Installing Acrylic Lenses and Optics Tube Window 26

Section 5: Interconnect Diagrams 112119

Section 6: Repair Parts

Key to Repair Parts List 1 Parts List (3 pages) 2

Section 7: FDT Assembly Drawing 112000 Domestic 3 sheets

FDT Assembly Drawing 112200 International (CE) 4 sheets

Section 8: Schematics 112106, 112091 , 112037

Section 9: CE Model Disassembly and Repair

9.1 Removal of Rear Housing/LCD Assembly 1

9.2 Replacement of Rear Housing/LCD Assembly 3

9.3 Disassembly of Optics 3

9.4 Assembly of Optics 10

9.5 Removal of Printer 14

9.6 Installing Printer 15

9.7 Removal of MCU/ PCB 16

9.8 Installing MCU/PCB 19

9.9 Installing a Replacement Chassis/Monitor Assembly 20

9.10 Removal of Transformer 20

9.11 Installing Transformer 21

9.12 Removal of PRB Jack 21

9.13 Replacement of PRB Jack 21

9.14 Removal of Power Entry Module 21

9.15 Replacement of Power Entry Module 22

9.16 Removal of Visor Position Sensor Board (VPS) 22

9.17 Replacement of VPS 22

9.18 Removal of Internal Photodetector (IP) 23

9.19 Replacement of IP 23

9.20 Removal of LCD Module/Keypad 23

9.21 Replacement of LCD Module/Keypad 24

9.22 Removal of Visor Pad 24

9.23 Installing Visor Pad 25

9.24 Removal of Acrylic Lenses and Optics Tube Window 25

9.25 Installing Acrylic Lenses and Optics Tube Window 26

iv HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 1 - General Information

The 710 Series FDT Visual Field Instrument utilizes Frequency Doubling Technology (FDT). Various preprogrammed patterns of flickering black and white vertical bars are presented to the patient on a video screen. Each patient is tested on the degree of contrast between the black and white bars which enables them to see each pattern.

The Frequency Doubling stimulus taps into a select subset of retinal ganglion cells that have been observed to die in early glaucoma patients. Because the stimulus is selective only to this subset of cells, the test is accurate and rapid.

About The 710 Series FDT

Visual Field Instrument

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

Section 1 - General Information

Help Information:

All service and repairs must be performed by authorized Humphrey Instruments personnel or agents, using genuine replacement parts. Failure to do so will invalidate the prod-

uct warranty.

Read and understand all safety warnings and service notes printed in this Service Manual and the User’s Guide. If in doubt about any precaution or procedure, call Humphrey Instruments Customer Service phone

number below.

For Phone Help, call Humphrey Instruments Customer Service at: 800-341-6968

The part and serial numbers are located on the bottom of the unit.

Troubleshooting assistance is contained in Section 3 of this manual. Troubleshooting is limited to board level replacement and not board component replacement.

Please read and understand FDT User’s Guide #112098, a copy of which may be obtained by calling Humphrey Instruments Customer Service Department at the toll free 800 number above.

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 1 - General Information

Read Important Safety Information in User’s Guide.

EXERCISE EXTREME CAUTION WHEN SERVICING THE FDT! THE MONITOR ASSEMBLY OPERATES ON APPROXIMATELY 10,000 VOLTS!

Do not remove the plug from the end of the CRT exposing sharp glass process tube. This can cause cuts! (Photo 1 at right.)

Disconnect FDT from Mains when disassembling.

Clean as recommended in Users Guide.

Follow ESD precautions during service.

Test repaired FDT units at 115v and 230v prior to returning them to customers.

Support the FDT by holding under the base to protect the upper optics section from stress.

Important Safety Warnings

and Service Notes

Photo 1

Please DO NOT adjust pots on the monitor board.

The video monitor is a non-standard design and because of this, there are no field monitor or video service adjustments. Video adjustments can only be performed by the monitor manufacturer with special equipment. Unauthorized adjustments may result

in clinically invalid results without obvious indications of any malfunction. (Photo 2 at right)

Tighten fasteners carefully. Refer to drawing #112000 in this manual for recommended fastener torque specifications.

Put a calibration cap (see bubble number 90 on drawing 112000) on the optics tube assembly during servicing to protect optics tube window.

The RS232 connector housing of the MCU PCB projects below the bottom of the MCU PCB (Photo 3 at right). Do not stand the chassis monitor assembly on this connector. Put the chassis monitor assembly on its back between repair steps.

Photo 2

Photo 3

Always install latest revision software when installing a new MCU/PCB. Call Humphrey Customer Service. See Section 2 Pg. 4 for details.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

Section 1 - General Information

Important Safety Warnings

and Service Notes

Photo 4

Copper ESD shields may have sharp edges.

Exercise caution to avoid cuts!

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 1 - General Information

FDT MAIN

ENTER

PATIENT

AGE

UTILITIES

**ADVANCE

PAPER

RUN DEMO.

RUN

PATIENT

TESTS

SET-UP

INSTRUMENT

RUN SELF

CAL.

INSTRUMENT

TESTS MENU

ABOUT FDT

RUN

SCREENING

C-20 TEST

RUN FULL

THRESHOLD

C-20 TEST

RUN FULL

THRESHOLD

N-30 TEST

SKIP EYE

SET CLOCK

SET-UP

OPTIONS

SET-UP

REPORT

TEST

INPUTS

TEST

OUTPUTS

TEST

SERIAL

PORT

SELECT

LANGUAGE

OPTIONS

RESET TO

DEFAULTS

TEST LCD

TEST VIDEO

TEST

SPEAKER

TEST

PRINTER

AMBIENT

LIGHT

CHECK

CALIBRATION

CHECK

FACTORY

CALIBRATION

RUN

PRINTOUT

TEST

ADVANCE

PAPER

TEST VIDEO

SYSTEM

TEST A/D

CIRCUITRY

+10 years

-10 years

+ 1 year

ACCEPT SETTING

BUTTONS

PRB

VIEWPORT

POS

CHECKERBOARD

BLANK SCREEN

FULL SCREEN

** AFTER TEST PERFORMED, WILL READ

LAST PATIENT RESULTS

DIXIE PATTERN

LCD MEMORY

BACKLIGHT (ON/OFF)

Printer

Status

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 5

Section 1 - General Information

6 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 1 - General Information

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 7

Section 2 - Service

When an FDT unit is returned, check:

1) Physical condition of packaging.

2) Physical condition of unit.

3) List any accessories with unit, for example: power cord Patient Response Button (PRB) calibration cap dust cover computer interface cable

Incoming Inspection

4) Perform “PRINT SET-UP REPORT” if possible, and keep for reference.

5) Perform Cleaning/Disinfection per instuctions

in User’s Guide, Section 4, Maintenance.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

Section 2 - Service

Tools Required for Service

Factory Calibration

and Software

Uploading

Photo 1

#1 Flathead screwdriver - 2” length #1 Phillips screwdriver - 4” length #2 Philips screwdriver - 4” length 1/4” drive ratchet with 1/4” extender 11/32” socket 3/32” hex key 7/64” hex key Adjustable torque driver - 2 - 14 in/lbs range Bits for Torque Driver:

#1 Phillips #2 Phillips 3/32” hex 7/64” hex

1/4” square to hex adapter Torque Wrench - Adjustable 2 - 14 in/lbs range Torque Handle: Mountz 06-8002 TB1H 12-21 in/lb or equivalent. Torque Handle Box Wrench accessory: Mountz 068127 Box Head - 11/32”

Photo 1b

T15145 - for PRB connector T15104 - Calibrator and Software Floppy Disc

(see Photo 1 at left)

T15810- Serial Port Tester (can be made with a standard DB 9 female with these connections: Pins 1,4,6,9 common

Pins 2,3 common

Pins 6,8 common Digital volt meter ( three plus range) Needle nose pliers

Photo 2

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

Upgrade recommendation: Upgrade all re-

turned FDT’s with Software Version 2.10. Perform Factory Calibration Process.

Start Factory Calibration Process:

1 Turn FDT unit OFF.

2 Connect the wire from the T-15102 Factory

Calibrator to connector board as shown in Photo 3. Wires must exit from top of connector as shown.

3 Remove Visor/Browrest (Sect 4 or 9 for CE FDT)

Factory Calibration

for Software Version.

1.20 or higher

4 Tilt FDT on its side to remove label over Calibration/

Software loading port J2.

5 Align threaded studs of connector board with the two

holes near port J2 as shown in Photo 4.

6 Insert T 15102 into port J2 as shown in Photo 5.

Hookup should be as shown in Figure 1 below.

Fig. 1

connector board T 15102

7 Position the FDT in upright position and place

calibrator onto the slide bracket . See Photo 6

Note: Place calibrator on viewport tightly to prevent

light from entering the calibrator housing.

Photo 3

Photo 4

8 Turn the FDT ON and view the menu on the LCD:

a) Press button next to UTILITIES MENU b) Press button next to INSTRUMENT TEST MENU c) Press button next to TEST OUTPUTS d) Press button next to TEST VIDEO MENU e) Press button next to FACTORY CALIBRATION

NOTE: Unit can be calibrated with PC utility Calibrat through the FDT computer interface. Refer to the Calibrate utility for more information.

9 Press any button to indicate that you have placed

the factory calibrator on the view port.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

Photo 5

Photo 6

Section 2 - Service

Factory Calibration

for Software Version.

1.20 or higher (continued)

10 Press any button to start the Factory Calibration

calibration process. Duration : less than 1minute.

NOTE: Self-Calibrate is automatically performed

during Factory Calibration in Version 2.10

11 Turn the FDT OFF and remove calibrator from

slide bracket.

12 Remove T-15102 connector board from Port J2 on

bottom of FDT. Install a new label part # 112066 over J2 port.

13 Turn FDT ON and view the menu on the FDT LCD:

a) Press the green button until the UTILITIES

Menu is reached. b) Put the black calibration cap on the viewport. c) Press the button next to RUN SELF

CALIBRATION. (Process time: 2 - 3 min.)

Note: A progress indicator will display on the LCD. It

will indicate what percentage of the calibration is complete. The unit will indicate when calibration is complete and return to UTILITIES MENU.

14 Now perform a Calibration check:

a) Press button next to INSTRUMENT TEST

MENU.

b) Press button next to TEST OUTPUTS c) Press button next to TEST VIDEO MENU d) Press button next to CALIBRATION CHECK

Note: The meter will indicate that the FDT is fully

calibrated.

15 Press any button to continue.

16 Press the green button 4 times or until FDT MAIN

MENU is reached.

17 Install the visor/browrest with the 4 black hex socket

head cap screws as shown in Section 4.

Note: See Calibration Limits/Parameters Tables

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT

in this section.

(End of Factory Calibration Process)

SERVICE MANUAL 112120 REV. B

Section 2 - Service

Start Software Loading Process:

1 Connect the ribbon cable to the ICD Cable

connector as shown in Photo 7 at right.

Note: a) 2 Pins at right are not used

b) Align the red wire of the ribbon cable

with the red arrow on ICD connector.

2 Connect the ribbon cable to the connector board as

shown in Photo 8.

3 Connect ICD connector to the PC Parallel Port .

See Figure 2 below.

Loading Software for FDT

Note: FDT software is not

Mac compatible.

Photo 7

Figure 2

4 Insert T 15102 into port J2 as shown in Photo 5

and follow software loading instructions displayed on the PC when running FDT Software Installation Program.

Note: Whenever installing a new MCU/PCB and

loading highest revision software, verify proper hardware (marked on MCU/PCB) version using “ABOUT FDT”. LCD Screen will display software/hardware data. See Photo 9

Software Version: Release Date:

Ver. 1.20 July 1997 Ver. 2.10 October 1997

Hardware Version: Release Date: MCU/PCB Rev 503 August 1997 MCU/PCB Rev 504 September 1997

Photo 8

Photo 9 FDT LCD Screen

Note: See Product Updates in this section.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 5

Section 2 - Service

Final Testing (page 1 of 6)

Note: Follow this final testing process to verify correct operation after the FDT has been serviced.

1. Calibration

Follow instructions in the calibration section of manual.

2. 230 Volt testing

Remove fuse block. Replace the 115v fuses (.315A) with those recommended for 230v.(.160A) Place fuse block back into unit so the 230v shows. Plug unit into a 230v line and turn unit on. After approximately 10-15 seconds the unit should go through a series of beeps and the FDT Main menu should appear. After this test is done, turn off unit, remove power and replace the fuses with the 115V (.315A) ones. Be sure that the115V shows in the fuse drawer.

3. Operational testing

3.1 Plug in PRB.

3.2 Turn unit on. After approximately 10-15

seconds the unit will complete self diagnostics and emit two double beeps. The FDT main menu will appear.

3.3 Press the button next to UTILITIES

MENU.

3.3.1 Check the intensity adjustment. a) Press the button pointing

b) Press the button pointing

c) Use both buttons as needed

downward. The LCD contrast will decrease.

upward. The LCD contrast will increase.

to return to usable LCD contrast.

6 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

3.3.2 Press the button next to ABOUT

3.3.3 Press the green button on the

3.4 Press the button to the left of INSTRUMENT TESTS MENU.

3.4.1 Press the button next to

FDT. The screen will indicate that the unit is fully calibrated and show the software revision. Make sure that it has the latest revision software.

bottom left. This should bring you back to the UTILITIES MENU.

TEST INPUTS.

a) Press each of the 4 upper

left buttons. When each buttons is pressed, the word PRESS to the right of the button will change to a PRESSED highlighted. Release the button. PRESS will reappear unhighlighted.

b) Move the visor to the three

different positions - left, middle and right (patients side). The Eye test posi- tion on the right hand side of the display will change state to indicate the current eye test position.

c) The Patient button will

indicate NOT PRESSED. Press the PRB and it will report a highlighted PRESSED.

d) Unplug the PRB plug from

the PRB jack. The Patient Button status will indicate: Not connected. Plug the PRB plug into the PRB jack.

Final Testing

(page 2 of 6)

3.4.2 Press the green button on the

bottom left to return to INSTRUMENT TESTS MENU.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 7

Section 2 - Service

Final Testing (page 3 of 6)

3.5 Press the button next to TEST OUTPUTS.

3.5.1 Press the button next to TEST LCD.

a) Observe highlighted test

option on screen.

b) Press button next to RUN

TEST. The LCD will reflect state of the highlighted test option.

c) Press any button to exit

present LCD test.

d) Press button next to NEXT

CHOICE to change test option.

e) Perform the above steps for

the CHECKERBOARD,

BLANK SCREEN, FULL SCREEN, AND DIXIE PATTERN options.

f) Press button next to NEXT

CHOICE to highlight LCD MEMORY TEST.

g) Press button next to RUN

TEST. The display will be; Testing LCD memory and change to LCD memory passed. Press any button

to exit test.

h) Press button next to NEXT

CHOICE to highlight the BACKLIGHT option.

i) Press button next to RUN

TEST a number of times

and observe the LCD screen. The backlight should toggle on and off. Make sure the Backlight is on before exiting this test.

j) Press the green button to

return to OUTPUT TESTS.

8 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

3.5.2 Press the button next to TEST

3.5.3 Press the button next to AMBIENT

VIDEO MENU.

a) Press the button next to

TEST VIDEO SYSTEM.

b) Look into the patient viewing

area. A large flashing circle exhibiting the Model 710 Seriesgrating pattern in the center of the viewing area will be visible.

c) Press the Green button to

return to TEST VIDEO

MENU.

LIGHT CHECK.

a) There may be a short time

for monitor warm up.

b) With the calibration cap on,

the pointer will be in the dark range.

c) Remove the calibration cap.

The pointer will rise to the light or bright range, depending upon the intensity of the room lighting.

d) Put the calibration cap back

on and press the green button to return to TEST

VIDEO MENU.

Final Testing

(page 4 of 6)

3.5.4 Put Calibration cap on. Press button next to CALIBRATION

CHECK.

NOTE:Calibration will be denied if cap is off and room

light level is too high.

a) The pointer should be in the

fully calibrated range.

b) Do not press the factory

calibration option. If this option is accidentally chosen, the unit will detect that a calibrator is not attached and warn user.

c) Press the green button twice

to return to OUTPUT

TESTS MENU.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 9

Section 2 - Service

Final Testing

(page 5 of 6)

Final Testing

3.6 Press the button next to TEST SPEAKER.

3.6.1 There will be increasing tones.

3.7 Press the button next to TEST PRINTER MENU.

3.7.1 The TEST PRINTER MENU will be displayed. Press the button next to RUN PRINTOUT TEST. The FDT will print out a series of patterns and instrument data.

3.7.2 Press the button next to ADVANCE PAPER. The paper will advance about 1-2 inches beyond the slot in the paper door.

3.7.3 Press the button next to PRINTER

STATUS. “PRINTER OK”

message will appear.

Photo 10

3.7.4 Press the green button 3 times to return to INSTRUMENT TESTS

MENU.

3.8 Press the button next to TEST SERIAL PORT.

3.8.1 Press any of top four buttons to execute test.

3.8.2 Both the data transfer and hand shaking test should fail.

3.8.3 Press the green button to return to INSTRUMENT TESTS MENU.

3.8.4 Place T-15810 into the serial port on bottom of unit. See Photo 10.

3.8.5 Press the button next to TEST SERIAL PORT. a) Press any of top four but-

tons to execute tests.

b) LCD will display:

DATA TRANFER PASSED HANDSHAKING PASSED

10 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

3.8.6 Press the green button twice to

3.8.7 Remove T-15810.

3.9 Press the button next to A/D CIRCUITRY.

3.9.1 A reading will come up for

3.10 Perform a screening test to check unit operation.

3.11 Turn unit off.

4. Agency testing

4.1 Hypot Testing at 1500VAC for one second. Apply the voltage between primary wiring (supply terminals connected together) and accessible dead metal parts without breakdown indication.

4.2 Ground continuity Total resistance of the product shall not exceed 0.2 ohms (2.0VDC). The test will be conducted using a 10 amp DC current source with a no load voltage no greater than 6.0VDC for five seconds. Measure ment will be taken from the grounding pin of the power supply cord to the accessible metal part of the product.

4.3 Leakage current The leakage current measured from any exposed grounded metal parts to the grounding pin of the power supply cord shall not exceed 100 microamps, AC RMS (95.5MVAC RMS) with input voltage set to 120VAC, 60HZ or 240VAC, 50HZ.

return to INSTRUMENT TESTS

MENU.

Mean gray and printhead tem perature. If the unit fails this test a malfunction error will appear.

Final Testing

(Page 6 jof 6)

Hypot, Ground Continuity,

and Leakage Current

Testing

(For In-House use only.)

If a FTD fails any test in this section, set it aside for troubleshooting and repair. When the FDT is repaired and passes all the tests, place a label over the calibration port.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 11

Section 2 - Service

Important Shipping

Information

Paper roll foam prevents

un-winding during ship-

ping

Note: Install a new roll of paper.

Install the paper roll foam before packing the unit for shipping. See photo at left. This foam strip (called foam shipping wedge in User’s Guide) prevents the paper roll from unwinding during shipping.

Return all of the customer’s accessories.

12 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

Calibration Limits Information

Table A:Calibration Parameters Printed on the System Status Report

Parameter Nominal SW

Limit

Expected Min

Min

SCAN LINE (internal)

GAMMA *2.35 1.0 *2.2 *2.5 <3.0

REFERENCE POT

INTERNAL

TARGET

DC OFFSET 30 0 *10 *50 1023

INTERNAL PEAK

*90 6 *60 *110 235

NA 0

*2250 0 *1500 *3000 4095

Internal Target 0

*15 (new CRT)

Internal Target - 40

Expected Max

*60 (new CRT)

Internal Target + 40

SW Limit Max

255

4095

Comments/Description F.C.** S.F.***

Reflects mechanical alignment of photodetector to CRT.

CRT response correction exponent.

Adjusts for CRT aging. ( *150 expected max on old CRT)

Absolute value read from Internal photodetector ADC when CRT is 200 c/m^2.

DC offset on internal photodetector signal.

Absolute value read from Internal photodetector ADC when CRT is as close to 200 c/m^2 as the reference pot can adjust.

* These numbers are approximate and have not been verified by statistical tracking. ** Adjusted during Factory Calibration

***Adjusted during Self Calibration

Table B:Calibration Parameters to LCD and Serial Port: Factory Calibration

Message Expected Limits Comment

INTERNAL PEAK NA This is a transeint message that reports DAC settings.

External Photo Sensor Stop Line

External Photosensor 3000+/- 20

DC OFFSET Same as in table (A) above. Same as in table (A) above.

Internal Photosensor Stop Line

Internal Photosensor

* These numbers are approximate and have not been verified by statistical tracking.

SERVICE MANUAL 112120 REV. B

*40 min, *70 nom, *100 max Two passes: Second pass should be within 16 of first.

External target 3000 = 200c/m^2. This is how close the reference pot gets to 200 c/m^2.

Same as SCAN LINE in table (A) above.

Same as INTERNAL TARGET in table (A) above.

Same as in table (A) above.

HUMPHREY FDT VISUAL FIELD INSTRUMENT 13

Section 2 - Service

Calibration Limits Information

Table C:Calibration Parameters to LCD and Serial Port: Self Calibration

Message Expected Limits Comment

Internal Photosensor

Ambient Light

REFERENCE POT

Dynamic Range 82 min allowed by SW (50:1) Full screen brightness to zero screen brightness ratio.

Gamma Factor

Linearity

Same as INTERNAL TARGET

in table (A) above.

82 max allowed by SW

(2% of full brightness)

Same as REFERENCE POT in

table (A) above.

Same as in GAMMA CORRECTION in table (A) above.

Second Column is limited to 120 (3% deviation from straight line)

Same as in table (A) above.

Keep unit as dark as possible. If this fails in dark, unit is broken, or DC offset is bad - Factory calibration needed.

Same as in table (A) above.

First column is linear ramp target value written to DAC. Second column is photodetector reading deviation from the linear ramp. Scale is 127 - 4095.

* These numbers are approximate and have not been verified by statistical tracking.

14 HUMPHREY FDT VISUAL FIELD INSTRUMENT SERVICE MANUAL 112120 REV. B

Section 2 - Service

Product Updates

Effectivity S/N Cut-In

7/97 S#9700200

8/97 S#9701000

8/29/97 ~S#9701145 Color changes of housings:cream to gray.

9/11/97 S#9701199

9/15/97 ~S#9701210

10/3/97 S#9701294 SW Version 2.10 (Language translations)

DOMESTIC FDT UNITS : Description of Changes for 00710-11

Sales Demo Units (all S#>9700199 and

9701000) . Monitor needs rework at some time to extend calibration life.

SW Version 8.30. HW Version 50300 (MCU PCB 112037-503)

Initial Production units for end users (all S#>9701000). SW Version 1.20. HW Version 50300 (MCU PCB 112037-503)

HW version 50400 (MCU PCB 112037-504 for CE)

Calibration Caps (pn112078-1) Started shipping

with instruments.

Effectivity S/N Cut-In

9/97 S#9731000

S#9731025

(also

10/3/97

S#9731019

and

S#9731023

are Ver. 2.10

SERVICE MANUAL 112120 REV. B

CE INTERNATIONAL FDT UNITS : Description of Changes for 00710-X1 (X=2-9)

Note:Domestic S#'s have a 0 in the 3rd digit, International S#'s have a 3)

Initial International Production units (all S#'s>9731000) SW Version 1.20. HW version 50400 (MCU PCB 112037-504 for CE)

SW Version 2.10 (language translations)

HUMPHREY FDT VISUAL FIELD INSTRUMENT 15

3 Troubleshooting

Note: Install Latest Revision Software with New MCU/PCB

Chief Complaint Cause Corrective Action

Does not power up.

No LCD backlight or text (with high or low contrast)

LCD has backlight but no

text

LCD has text but no backlight

a) Improper fuse drawer setting.

b) Blown fuse(s) Replace fuses. No

c) Improperly wired power entry module.

d) Defective transformer Replace transformer No

a) Loose connections, damaged cables.

b) Failed LCD module Replace LCD No

c) MCU PCB defective Replace MCU PCB Yes

a) Failed LCD contrast keypad

a) Loose connections Restore connections No

b) Defective LCD module Replace LCD module No

Correct fuse drawer No

Restore correct connections No

Check connection. No

Clean or replace keypad No

Factory Calibration

Required

PRB not working (patient response button)

Unit not sure of visor position

Unit will not calibrate using

the calbrator

c) Defective MCU PCB Replace MCU PCB Yes

a) Improper/Defective connection with unit

b) Defective PRB Replace PRB No

c) Defective PRB connector

d) Defective MCU PCB Replace MCU PCB Yes

a) Defective VPS PCB Replace VPS PCB No

b) Reflective labels missing

c) Defective MCU PCB Replace MCU PCB Yes

a) Defective calibrator

b) Defective internal light meter.

Check connections of PRB connector and MCU PCB

Replace PRB connector No

Replace labels No

Check calibrator on another unit. (If calibrator is defective, send in for calibration.)

Replace internal light meter (PCB)

FDT does not require cal., but calibrator does need

to be calibrated at factory.

Yes

c) Defective Monitor Assembly.

d) Defective MCU PCB Replace MCU PCB Yes

Replace Monitor Assemlby Yes

See next page for important note when installing a new MCU/PCB.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

3 Troubleshooting

Note: Install Latest Revision Software with New MCU/PCB

Chief Complaint Cause Corrective Action

No printing on paper a) Incorrectly installed paper.

b) Defective paper Replace paper No

c) Incorrect paper Replace paper No

d) Defective printer Replace printer No

e) Wiring problems

f) Defective MCU PCB Replace MCU PCB Yes

RS 232 Port Malfunctions

Does not advance paper

a) No output (8.5Vac) from purple transformer wires.

b) Defective MCU PCB. Broken RS232 connector. (Bent pins, bad solder joint.)

a) Loose connectors, damaged cables.

b) Defective printer motor. Replace printer No

Install paper correctly referen cing Users' Guide.

Correct wiring or replace printer.

Replace transformer No

Replace MCU PCB Yes

Restore connection or replace cables .

Factory Calibration

Required

Optics tube window damaged

Spots on optics a) Debris on lens Clean optics

Install new optics tube window. Yes

(If optics are

disassembled, Factory

Calibration is required due

to possible change in

allignment of Internal

Photodetector.)

Important Note when installing a new MCU/PCB:

For new MCU/PCB’s, use the PC utility SETNVRAM to initialize NVRAM and to load the following: PATIENT TESTS CRT ACTIVE TIME UNIT ON TIME Calibration Count S/N (Serial Number) HW VER (Hardware Version) MODEL NUMBER ODOMETER SEG

Yes

REFER TO THE PC UTILITY SETNVRAM FOR MORE INFORMATION.

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT SERVICE MANUAL 112120 REV. B

3 Troubleshooting

A “P.O.S.T.” test is automatically programmed to occur each time the FDT unit is switched to ON. Two double “beeps” will be made by the unit near the end of the test. Four conditions can occur when the unit Powers UP: Fully Calibrated, Needs Calibration/Return Unit to Factory, Needs Self Calibration, and Hardware Failure. These are shown in the POST table below:

Printout

STATUS and

Message

ABOUT FDT:

Status Code

found in SET

NVRAM utility

RUN STATUS "

Display on

LCD

Cause(s) of Message(s) Next Step

Power On Self Test

(P.O.S.T.) Status

Table

FULLY

CALIBRATED

NEEDS CALIBRATION RETURN UNIT TO FACTORY

NEEDS SELF CALIBRATION

HARDWARE

FAILURE, RETURN UNIT TO FACTORY

"0" Main Menu

"1" Utilities Menu

CALIBRATION"

"2"

"3" Utilities Menu

*NOTE:

FOR VER

2.10

SELF

CALIBRATION

AUTOMATIC ALLY

FACTORY

FOLL OW

CALIBRATION

(NOTE: Depress

green button 2 times

to go to UTILITY

MENU to print out a

WILL

"SYSTEM FAILURE

NEEDS

report.)

1.Unit passed internal calibration.

1.Cancelled or failed factory calibration.

2.Start factory calibration.

3.Fails loading of default values to nvram.

1.Fails gamma checksum test.

2.Fails cal check.

3.Fails mean calc

4.Fails gamma table check.

5.Odom seg filled

6.Passed factory calibration.

7.Fail or cancel self calibration.

8.Fails nvram checksum.

1.Fails mean pot test.

2.Fails head temp circuit.

Unit is O.K.

Calibration

Perform Factory

Perform

Self

Perform Factory

Bit: Test: 0 RAM 1 ROM 2 RTC INITIALIZED 3 RTC WORKING 4 NVRAM 5 MEAN CALCULATED 6 MEAN_POT 7 REF_POT 8 HEAD_TEMP 9 LCD MEMORY A GAMMA TABLE

SERVICE MANUAL 112120 REV. B

All passed = F

All passed = 7

HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

POST Test Key

7FF = GOOD

NOTE:

Test results will appear on Set Up Report printout. If FDT will not print or will not complete calibration successfully, refer to Calibrat Utility for more information.

3 Troubleshooting

FDT Terminology

RAM

ROM

RTC INITIALIZED

RTC WORKING

NVRAM

MCU board memory test. Patterns written and read from RAM. If failure occurs, look for bad solder connections or bad traces associated with the RAM.

MCU ROM checksum test. If failure occurs, first try a new software upload. If no success, look for bad solder connections or bad traces associated with the FPROM.

If failure is indicated, the software has determined that the RTC was never told to start keeping time. Use WAM GT or a PC utility to initialize the clock and set the time.

If failure is indicated, the software has determined that the RTC can not be programmed to start keeping time for some reason. Check for problems on the MCU board in the areas of the RTC and the General IO sections.

If failure is indicated, the RTC memory checksum has failed. Use WAM GT or a PC utility to initialize the clock, set the time, and re-initialize the RTC. If this does not fix the problem, check for problems on the MCU board in the areas of the RTC and the General IO sections.

MEAN CALCULATED

MEAN_POT

REF_POT

HEAD_TEMP

The software attempts to match the shade and mask signals on the MCU board. If failure occurs, make sure that the system is calibrated. If failure still occurs, check for problems on the MCU board in the areas of the DAC, reference pot, mask pot, mask/shade comparator and the General IO sections.

This should be called "MASK POT". The software tests the mask pot by setting the mask pot to two different values, and verifies that the shade and mask match at two different values. If failure occurs, make sure that the system is calibrated. If failure still occurs, check for problems on the MCU board in the areas of the DAC, reference pot, mask pot, mask/shade comparator and the General IO sections.

The software tests the reference pot by setting the reference pot to two different values, and verifies that the value reported from the pseudo DAC when measuring a constant voltage (the head temperature signal) reports two different values. (Normally, the reference pot is set to its highest value, guaranteeing an accurate reference voltage to the DAC, to measure the head temperature). If failure occurs, check for problems on the MCU board in the areas of the DAC, reference pot, head temperature comparator, and the General IO sections.

The software tests the head temperature by setting the reference pot to its highest value, (guaranteeing an accurate reference voltage to the DAC) and then incrementing the DAC until the head temperature comparator toggles. If failure occurs, check for problems on the MCU board in the areas of the DAC, reference pot, head temperature comparator, and the General IO sections.

The software does a RAM type memory test to the LCD. If failure occurs, look

LCD MEMORY

GAMMA TABLE

for problems in the LCD module, and the LCD ribbon cable. On the MCU board, it could be a problem with the MSB bus transceiver or the LCD section.

This normally gets deleted whenever a software upload is done. It is fixed by self calibration.

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT SERVICE MANUAL 112120 REV. B

3 Troubleshooting

Error Messages

"Printer Overheated"

Normal Printing Operations

(Printer Tests)

"Too Much Ambient

Light"

Normal Operation or

During Self Cal.

"Data Transfer Failed"

Loopback Test Only

"Handshaking Failed"

Loopback Test Only

"Stop Not Found"

Factory Cal. Only

This message is invoked when the video monitor shuts down the +24V when the controller board asks for it. The video monitor +24V supply is linear, and designed to shut down if the pass transistor temperature gets too hot. It is very unlikely that this will ever happen, as it has been shown that a complete roll of paper worth of consecutive tests can be printed at high line without this happening. Consecutive printer tests can do this, though, because of the higher density printout in this test. If this message appears when there has not been an extreme amount of printing, suspect the +24V enable, and the +24V supply itself.

Either there is too much ambient light, or the video monitor won't dim, or the ADC on the video controller board is malfunctioning, or the Factory Cal (specifically the DC Offset or Internal Target or Internal Peak parameters) is bad.

During the RS232 testing, the data signals TXD and RXD are tested. Failure can occur with no loop back cable, bad loop back cable. If not, follow the signal paths from the MCU through the cable.

During the RD232 testing, the hardware handshaking signals, CTS, RTS, DTR, DCD, and RI are tested. Failure can occur with no loop back cable, bad loop back cable. If not, follow signal paths from the MCU through the cable.

During calibration, the software finds the peak of the CRT electron beam light output as it appears on the photodetector waveform. Then, during subsequent measurements, it stops sampling the light waveform at the scan line that it found the peak. This process provides for extremely precise and repeatable the light measurements. This process is used for both the internal and external light meters. It corrects for the slight differences in mechanical alignment. This failure will occur if the offending light meter is mechanically misaligned, dirty, or nonfunctional. ADC problems could also indirectly cause this message. A defective CRT could also indirectly cause this failure.

"Photosensor Not

Attached"

Factory Cal. Only

"Runtime Error"

Normal

The software tests for this is by setting the CRT first bright, then dim, then bright, and looking for the corresponding photodetector changes. If this failure occurs, either the photosensor is not attached, not working, occluded, or the ADC is not functional. A defective CRT could also indirectly cause this failure.

This is strictly a software issue, possibly caused by ESD, induced EMI, or bad software. If it occurs, reboot the system. If it still occurs, re-load the software.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 5

Section 4 - Disassembly and Repair

EXERCISE EXTREME CAUTION WHEN SERVICING THE FDT!

THE MONITOR ASSEMBLY OPERATES ON APPROXIMATELY 10,000 VOLTS!

4.1 REMOVAL OF REAR HOUSING/ LCD

4.1.1 Lower paper door. See photo.

4.1.2 Remove paper: a) pull lever down b) pull paper out

Caution: It is essential that you use proper ElectroStatic Discharge (ESD) precautions when disassembling or handling the instrument circuitry or printed circuit boards (PCB’s). Many components in the instrument such as the MCU/PCB, are highly susceptible to static discharge damage. Keep all boards in their protective ESD packaging.

4.1.3 Remove 4 screws from rear housing.

4.1.4 Lower rear housing/LCD assembly .

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

Section 4 - Disassembly and Repair

4.1.5 Disconnect LCD ESD shield strap from upper printer shelf. Use 11/32” socket to remove nut.

4.1.6 Disconnect wiring from LCD/PCB: a) Pull Printer Ribbon Cable connector J1 from LCD/PCB .

4.1.6 Disconnect wiring from LCD/PCB: b)Disconnect 3 connectors

(shown in photo from left to right) Stepper Motor Connector - P3 Paper Out Connector - P2 Head Up Connector - P1

4.1.7 Place rear housing/LCD sub assem bly into a clean anit-static bag for later use.

4.1.8 Pull paper door up from base housing.

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.2 REPLACEMENT OF REAR HOUSING/LCD ASSEMBLY

4.2.1 Reassemble in reverse order with follow ing notes: a) Push Keyed ribbon cable into connector J1 of the LCD module. b) Run wire assemblies OVER the ribbon cable. c) Restore P1, P1, and P3 connections to the LCD/PCB. d) Ensure that the LCD ESD ground shield stays on the inside of the rear housing as rear housing/LCD sub assembly is closed. See photo.

4.2.2 Plug unit in and turn on

4.2.3 Replace paper roll per instructions in user’s manual.

4.2.4 Close paper door.

4.3 DISASSEMBLY OF OPTICS

4.3.1 Remove rear housing/LCD sub assembly. (Refer to 4.1)

4.3.2 Remove front housing: a) Remove screw from front housing

b) Pull front housing out

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

Section 4 - Disassembly and Repair

4.3.3 Remove left and right rear housings: a) Pull clip from top of housings. b) Remove screw from top inside of unit to disconnect side housings from front housings. (Use magnetic tip screwdriver to keep the screw from falling into the unit.)

4.3.3 Remove left and right rear housings: c) Remove 2 screws that connect each housing to chassis.

4.3.3 Remove left and right rear housings: d)Pull housing up and out of base assembly

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.3.4 Remove visor/browrest assembly: a) Unscrew 4 set screws (7/64” key) b) Pull visor/browrest assembly off.

4.3.5 Remove screw and lockwasher from right side of ground cable.

4.3.6 Remove slide/bracket/ rod assembly: a)Remove screw and lock washer at each end of the slide bracked/rod assembly.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 5

Section 4 - Disassembly and Repair

4.3.6 Remove slide/bracket/ rod assembly: b)Remove visor backplate from visor guide by lifting out from top, then up.

Caution: Do not break the visor guide

(indicated by arrow in photo graph) in this step! Do not pull the visor backplate out too far as this will break the visor guide!

4.3.6 Remove slide/bracket/ rod assembly: c)Remove rod from slide-bracket.

Note: Place finger on visor wear pad to

prevent it from falling.

4.3.6 Remove slide/bracket/ rod assembly: d)Remove visor wear-pad and visor spring bracket.

6 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.3.6 Remove slide/bracket/ rod assembly: e)Remove 2 screws. f)Remove bracket.

4.3.7 Remove front left and front right housings: a)Remove two black screws from front of housings.

4.3.7 Remove front left and front right housings: b)Remove the rear EMI shield by removing the nut on each side (shown in Photo Inset) Use 11/32” wrench or socket. c)Remove 3 screws from each housing.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 7

Section 4 - Disassembly and Repair

4.3.7 Remove front left and front right housings: d)Spread and lift housings from base.

4.3.8 Disconnect wiring: a) Pull the VPS wires from J107 of the MCU PCB.

4.3.8 Disconnect wiring: b) Remove the screw and lock washer which attaches the ground wire ring terminal to the front ESD shield.

8 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.3.8 Disconnect wiring: c)Lift front housing backplate from optics tube assembly.

4.3.9 Remove front ESD shield: a)Remove screws from both ends of shield.

4.3.9 Remove front ESD shield: b) Gently pull front ESD shield from chassis without contacting compo nents on the PCB.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 9

Section 4 - Disassembly and Repair

4.3.9 Remove front ESD shield: c)Disconnect IP (Internal Photodetector) connector from J110 of MCU/ PCB.

4.3.10 Remove optics tube assembly: a)Remove 4 screws while supporting optics tube assembly.

4.3.10 Remove optics tube assembly: b)Remove optics tube assembly. c)Put optics tube assembly into dust free container or bag.

10 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.4 ASSEMBLY OF OPTICS

4.4.1 Replace the optics tube assembly: a)Place foam gasket into position.

Note: Notches on left and right sides of foam

gasket must fit over the tabs.

4.4.1 Replace the optics tube assembly: b)Hold the optics tube assembly with the IP PCB on the right side and fit it onto the monitor.

4.4.1 Replace the optics tube assembly: c)Position the optics tube assembly all the way on to the Monitor/Chas sis assembly. Make sure the optics tube assembly is not caught on the CRT band on top. Check slotted holes. Photo at right depicts right side of optics tube assembly positioned all the way onto the chassis.

d)Install and tighten 4 screws.

4.4.2 Place front housing backplate on to front of optics tube assembly.(See step 4.3.8)

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 11

Section 4 - Disassembly and Repair

4.4.3 Replace front ESD shield and restore connector to J110 of MCU PCB :(See 4.3.10 a,b,c)

4.4.4 Restore wiring connections: a)Ground Wire (See 4.3.9 b)

External Tooth lockwasher must be used for ground connection.

b)VPS wire connector to J107 of MCU PCB (See 4.3.9 a)

4.4.5 Replace front left and right housings: a)Place wires while installing front right housing.

Note:Proper alignment of front right and left housings is critical to proper sliding of visor. See photo for notch/tab relationship.

4.4.5 Replace front left and right housings: b)Put housings onto threaded studs at corners (this photo.) c)Install slide/bracket rod assembly (See 4.3.6) d)Install 2 black screws into front housings (See 4.3.8) e)Fasten left and right housings with 3 screws each. Use the longer where shown.

4.4.6 Install Rear EMI shield: a)Shield must contact but not move BLUE CAP of CRT. Put shield over screws. Tighten nuts. See Tools.

4.4.7 Install Rod into slide bracket: a)Put visor spring and visor wear pad into position.

12 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.4.7 Install Rod into slide bracket: b)Hold wear pad in place and slide the rod (as shown in photo) in from the left side of bracket. c)Test this assembly by sliding the rod left and right. The rod must

engage the detent at each end of the stroke to pass the test.

d)Put rod in center position.

4.4.8 Install visor backplate: a)Put visor backplate into notch in visor guide as shown in photo. b)Put visor backplate over the slide bracket/rod assembly. (See 4.3.6) c)Attach visor backplate to rod with screws and lockwashers. (See

4.3.6) d)Restore ground cable connection with screw and External tooth lockwasher. (See 4.3.5)

4.4.9 Install visor/browrest sub assembly: a)Slide the visor backplate to right. b)Put visor/browrest onto visor backplate with ground cable in

position shown in photo.

c)Secure with 4 set screws. d)Test this assembly by sliding left and right. The Visor must:

1)move smoothly

2)click (detent) at end of stroke.

3)not rub the ground cable.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 13

Section 4 - Disassembly and Repair

4.4.10 Install left and right rear housings: a)Put side housing bottom tabs into slots in base. b)Secure each cover with 2 screws (See 4.3.3 c) c)Fasten covers inside upper section with one screw(See 4.3.3 b)

4.4.10 Install left and right rear housings: d)Put clip on covers.

4.4.11 Install front housing: a)Align tabs and secure with one central screw. (See 4.3.2 a)

4.4.12 Install rear housing/LCD assembly: a)Follow instructions in Section 4.2

NOTE: If a new Internal

Photodetector board was installed, perform a Factory Calibration.

14 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.5 REMOVAL OF PRINTER

Note: Printers on early model FDT’s have

upper and lower printer shelves. Later FDT units use printer enclosures which are described in Section 9.5.

4.5.1 Remove rear housing/LCD assembly (See 4.1)

4.5.2 Remove left and right rear housings (See 4.3.3)

4.5.3 Remove upper printer shelf (see photo): a)Remove 2 screws with washers.

4.5.3 Remove upper printer shelf (see photo): b)Lift shelf out .

4.5.4 Remove ribbon cable from printer.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 15

Section 4 - Disassembly and Repair

4.5.5 Remove printer plate: a)Remove 2 screws with washers. b)Pull printer plate from chassis

4.6 INSTALLING PRINTER

4.6.1 Attach edge protectors as follows: (see assembly drawing for exact locations of edge protectors) a)1 for each side of chassis b)1 on the back of both printer plates (shelfs). c)1 circular protector on upper printer plate (shown in photo).

4.6.2 Install printer/printer plate assembly on chassis: a)Secure with 2 screws. b)Connect ribbon cable (keyed)

4.6.3 Replace upper printer shelf.See 4.5.3 a)Secure with 2 screws.

4.6.4 Install left and right rear housings. (See 4.4.10)

4.6.5 Install front housing.(See 4.4.11)

4.6.6 Install rear housing/LCD assembly. (See 4.4.12)

16 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.7 REMOVAL OF MCU PCB

4.7.1 Remove rear housing/LCD assembly. (See 4.1)

4.7.2 Remove Optics up to, but not in cluding the optics tube assembly. (See 4.3.1 through 4.3.10)

4.7.3 Disconnect wiring: a)Unplug J7 and J102 of MCU PCB. b)Unplug J1 (Shown in Photo)

4.7.3 Disconnect wiring: c)Unplug PRB wire from J105 of MCU PRB.

4.7.3 Disconnect wiring: d)Unplug P5 from Monitor Board.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 17

Section 4 - Disassembly and Repair

4.7.4 Remove Chassis/Monitor/MCU assy: a)Use 11/32” socket and extension to remove 4 nuts at base of chas sis.

4.7.4 Remove Chassis/Monitor/MCU assy: b)Tilt chassis/Monitor/MCU assy.

forward as you lift up.

CAUTION: Do not allow the MCU board to

contact front edge of opening in base (SEE arrow in photo.)

c)Lift assembly straight up from base.

CAUTION:See caution note and Photo #3 on

page 3 of Section 1 regarding not standing the chassis monitor asembly on the (RS232) connec of the MCU/PCB.

4.7.5 Remove MCU/PCB from Chassis: a)Remove 4 screws with split lockwashers from MCU/PCB four corners. b)Gently remove MCU/PCB .

CAUTION: There are Board to Board pin

connectors (J108 and J109 )at the top and bottom of the MCU/ PCB. Separate the boards carefully.

c)Remove PCB TO PCB connectors from board and store board in antistatic bag

18 HUMPHREY FDT VISUAL FIELD INSTRUMENT

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Section 4 - Disassembly and Repair

4.8 INSTALLING MCU/PCB

NOTE: Use PC utility to initialize/set

NVRAM when installing new MCU/PCB. Factory calibration is also required.

4.8.1 Install MCU/PCB a)Insert Connector,PCB to PCB (pn

112086) into top and bottom sockets of new MCU/PCB. b)Align the pins with the sockets of Monitor Board in chassis and gently press boards together.

c)Secure with 4 screws.

4.8.2 Install Chassis/Monitor/MCU assy. a)Important:Move all wires from footprint area of the chassis to avoid pinching of wires.

4.8.2 Install Chassis/Monitor/MCU assy. b)Tilt the chassis assembly forward.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 19

Section 4 - Disassembly and Repair

4.8.2 Install Chassis/Monitor/MCU assy. c)Position chassis onto base plate threaded studs. d)Secure the chassis with 4 nuts.

4.8.3 Complete the installation of the MCU/ PCB by following steps 4.7.1 - 4.7.3 in reverse order.

NOTE: Use PC utility to initialize/set

NVRAM when installing new MCU/PCB. Factory calibration is also required. See Section 3 pg. 2 for additional information on PC utility.

4.9 INSTALLING A REPLACEMENT CHASSIS/MONITOR ASSEMBLY

4.9.1 Secure ribbon cable clamps to chassis over ribbon cables.

4.9.2 Install MCU/PCB to new chassis.

4.9.3 Reassemble unit. Follow steps 4.7.1 through 4.7.3 in reverse order.

NOTE:

matched set. If either the CRT or the Monitor PCB fails, a new matched chassis/monitor assembly must be installed or the FDT will not function properly. DO NOT ADJUST POTS!

The chassis/monitor assembly is a

4.9.4 Perform a Factory Calibration only if you installed a new Chassis/Monitor.

4.10 REMOVAL OF TRANSFORMER

4.10.1 Remove rear housing/LCD assy. (Sect. 4.1.1 - 4.1.8)

4.10.2 Remove front housing. (Sect. 4.3.2)

4.10.3 Remove left and right rear housings. (Sect 4.3.3)

4.10.4 Disconnect J1 and J105 from MCU.

4.10.5 Partially lift Chassis/Monitor assembly from base and disconnect P5 from Monitor Board.

4.10.6 Remove Chassis/Monitor assembly. (Sect. 4.7.4)

4.10.7 Remove Transformer from base. a)Remove 4 nuts with 11/32” socket.

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Section 4 - Disassembly and Repair

4.10.7 Remove Transformer: b)Disconnect transformer wires from power entry module. c)Lift transformer from base.

4.11 INSTALLING TRANSFORMER

4.11.1 Install transformer in reverse order of removal.

4.11.2 Restore wiring connections. a)Refer to Sheet 2 of Drawing #112000 for correct placement of transformer wires to power entry module.

4.12 REMOVAL OF PRB JACK

4.12.1 Remove rear housing/LCD assy. (Sect. 4.1.1 - 4.1.8)

4.12.2 Remove front housing. (Sect. 4.3.2)

4.12.3 Remove left and right rear housings. (Sect 4.3.3)

4.12.4 Remove Upper printer shelf. (Sect 4.5.3)

4.12.5 Disconnect J1 and J105 from MCU.

4.12.6 Disconnect P5 from Monitor Board.

4.12.7 Remove Chassis/Monitor assembly. (Sect. 4.7.4)

4.12.8 Unscrew Ring Nut of PRB Jack with T-15145 (See Photo)

4.13 REPLACEMENT OF PRB JACK

4.13.1 Install new PRB Wire Assembly (jack and wire harness) in reverse order of disassembly.

4.14 REMOVAL OF POWER ENTRY MODULE

4.14.1 Remove Chassis/Monitor assembly per above steps 4.12.1-4.12.7.

4.14.2 Separate Housing and Base Plate: a)Remove 4 screws from rubber feet. b)Lift housing from base.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 21

Section 4 - Disassembly and Repair

4.14.3 Remove wires from module.

4.14.4Slide power entry module up and out of base plate.

4.15 REPLACEMENT OF POWER ENTRY MODULE

4.15.1Install power entry module. a)Press power entry module into

base plate assembly.

4.15.2 Restore wiring connections. a)Refer to Sheet 2 of Drawing #112000 for correct placement of wires to power entry module.

4.15.2 Replace the housing in reverse order. (See 4.14.1- 4.14.2)

4.16 REMOVAL OF VISOR POSITION SENSOR (VPS) PRINTED CIRCUIT BOARD (PCB)

4.16.1 Disassemble optics to VPS/PCB (See 4.3)

4.16.2 Remove VPS/PCB a)Cut cable tie. b)Remove screw as shown in photo. c)Disconnect VPS/PCB from front housing backplate.

P1 Phillips

4.17 REPLACEMENT OF VPS/PCB

4.17.1 Install VPS/PCB in reverse order.

22 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.18 REMOVAL OF INTERNAL PHOTO DETECTOR (IP) PCB.

4.18.1 Disassemble optics to optics tube assembly. (See 4.3)

4.18.2 Remove 2 screws from IP/PCB .

4.19 REPLACEMENT OF IP/PCB.

4.19.1 Install IP/PCB in reverse order of removal. Make sure sensor is clean.

NOTE:If you replaced the IP with a new IP,

factory calibration is required.

4.20 REMOVAL OF LCD MODULE/ KEYPAD

4.20.1 Remove Rear housing/LCD subassembly. Follow instructions in Sect. 4.1.1 through 4.1.6.

4.20.2 Remove LCD module. a)Unscrew 4 screws from module.

Note: Do not lose the insulating plastic

washer from screw shown in photo.

4.20.2 Remove LCD module. b)Carefully lift module from housing.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 23

Section 4 - Disassembly and Repair

4.20.3 Remove keypad a)Lift keypad from housing.

4.21 REPLACEMENT OF LCD MODULE/ KEYPAD

4.21.1 Perform LCD module/keypad removal in reverse order.

NOTE: Install plastic insulating washer

in position as shown in photo. This screw prevents shorting of adjacent component and is found in both CE and non CE units.

4.22 REMOVAL OF VISOR PAD

4.22.1 Remove visor/browrest sub assembly (Sect. 4.3.4)

4.22.2 Remove visor pad a)Pull and press simultaneously in directions of arrows as shown in photo. b)Repeat with other end of visor pad.

24 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 4 - Disassembly and Repair

4.23 INSTALLING VISOR PAD

4.32.1 Install visor pad. a)Place visor into visor as shown.

b)Press loops over posts on inside of visor.

4.23.2 Replace visor/browrest sub assembly (Sect. 4.4.9)

4.24 REMOVAL OF ACRYLIC LENSES and OPTICS TUBE WINDOW

4.24.1 Remove optics tube assembly (Sect. 4.3)

4.24.2 Remove optics tube housing: a)Remove screws that hold housings together. b)Carefully pull one housing off.

4.24.3 Remove acrylic lenses and or optics tube window by holding edges and gently sliding them from the optics tube.

4.24.4 If lenses or optics tube window are dirty, clean with a swab and alcohol and air dry. If a lens cannot be cleaned, install a clean replacement lens.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 25

Section 4 - Disassembly and Repair

4.25 INSTALLING ACRYLIC LENSES and OPTICS TUBE WINDOW.

NOTE:Since replacement lenses and window may have slightly different light transmittance characteristics , it is important to perform Factory Calibration.

4.25.1 Assure that all lenses have foam tape on edges. See Drawing#112000.

4.25.2 Clean housings with air.

NOTE:SEE PHOTO AT RIGHT. Be careful to leave one space between the lenses when inserting them into the housings. If put into two adjacent grooves, they will scratch eachother when inserting the second one.

4.25.3 Put lenses and optics tube window into one optics tube.

4.25.4 Assemble housings together. a)Slide other optics tube over lenses. b)Replace screws.

4.25.5 Reassemble optics (Sect. 4.4)

4.25.6 If any combination of new lenses and/or optics tube window have been installed, perform factory calibration.

26 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 5 - Interconnect Diagrams

Interconnect Diagram

112119 Rev B

(2 sheets)

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

6 Repair Parts

This column shows the quantities to order to get started per 100 FDT Instruments in your market. A shaded box indicates low probability that the part will be needed. THIS IS ONLY AN

ESTIMATE TO GET STARTED.

These columns indicate voltage of country of use. The check mark indicates the part is found in the unit of that voltage.

This column displays a number which appears on the assembly drawing. The number points out the specific part. “NA” indicates that the part is not referenced on the assembly drawing.

Key to Repair Parts List

Description of part.

Note: All fastener parts are

listed at the end of the spreadsheet.

Manufacturer repair part number.

Part No. Description Bubble Number 115 V 230 V Recommended

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

6 Repair Parts

Part No. Description Bubble Number 115V 230V

M11526 ANTISTATIC POLY BAG(30X36)PINK N/A 112050-502 PRB ASSEMBLY (BLACK) N/A 112065-2 LABEL, PRB MODEL N/A 112098 FDT - USER'S GUIDE, ENGLISH N/A 112098C OPERATING INSTRUCTIONS, N/A 112098FR FDT USER'S GUIDE, FRENCH N/A 112098GR FDT USER'S GUIDE, GERMAN N/A 112098IT FDT USER'S GUIDE, ITALIAN N/A 112098SP FDT USER'S GUIDE, SPANISH N/A 112113-504 BOX ASSEMBLY N/A 112131 DESICCANT BAG N/A 112132 FDT, REGISTRATION CARD,ENGLISH N/A 112136 FDT - QUICK REFERENCE,ENGLISH N/A 761076-0 POWER CORD, DETACH.(DOM/JAPAN) N/A 761076-2 POWER CORD, DETACH. (EUROPEAN) N/A 761076-4 POWER CORD, DETACH. (UK) N/A 761076-6 POWER CORD, DETACH. (AUSTRALIA) N/A 112120 REPAIR MANUAL N/A 112002-1 BASE PLATE ASSY 0001 112002-2 BASE PLATE ASSY 0001 112101-1 PRB, WIRE ASSY 0002 112143-2 PRB, WIRE ASSY 0002 112075 WIRECLIP 0003 112006-1 TRANSFORMER (120V/230V ISOLAT) 0004 112006-2 TRANSFORMER 0004 112005 POWER ENTRY MODULE 0006 112085-1 WIRE ASSY, 4.25 0007 488383 GROUND LABEL 0008 112064-2 LABEL, FUSE/READ MANUAL 0009 112003-2 HOUSING,BASE 0010 112004-2 FOOT, RUBBER (BLACK) 0011 112057-4 LABEL,MODEL DOMESTIC 0013 112057-3 LABEL,MODEL INTL 0013 M11478 PARTS LABEL 0014 112067-1 LABEL, CONNECTOR ID 0015 112007-1 VISOR 0016 236174-1 BATTERY COVER PAD 0017 112010-1 BROWREST 0018 112008-1 OPTICS TUBE 0019 112076-501 PCB ASSY, LIGHT METER 0020 112141-502 PCB ASSY, LIGHT METER 0020 112013 LENS, ACRYLIC 0022 112110-2 FOAM TAPE, LENS 0023 112011-1 WINDOW, OPTICS TUBE 0024 112110-1 FOAM TAPE OPTICS TUBE WINDOW 0025 112056 MONITOR GASKET 0027 112025-505 HOUSING,REAR, PRINTED 0029 112025-505R HOUSING,REAR, PRINTED 0029 112043-1 LCD ESD SHIELD 0030 112145 LCD ESD SHIELD 0030 112042-1 WINDOW,LCD 0031 112092-1 LCD BUTTONS 0032 1

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT

xx xx xx xx x

x x x

x xx xx xx xx x

x xx x

x x

x xx x

x xx xx xx xx xx xx x

x xx xx xx xx xx x

x x

SERVICE MANUAL 112120 REV. B

2 2 2 2 2 2 1

2 2 2 2 1

1 1

2 2 2 1

1 4 2 2 1 2 1 1

2 2 2 4 2 4

1 1 1 1 5

6 Repair Parts

Part No. Description Bubble Number115V230VRecommended

112091-1T LCD MODULE 0033 112091-2 LCD MODULE 0033 106103-43 MYLAR WASHER 0034 112041-502 MONITOR ASSY 0035 112041-503 MONITOR ASSY 0035 112037-504 PCB ASSY,MCU 0036 112086 CONNECTOR, PCB TO PCB 0037 112105-2 FRONT ESD SHIELD 0040 112026 PRINTER SHELF W/ PEMS 0042 112124-1 EDGE PROTECTOR 0043 112017 THERMAL PRINTER, 2 0044 112044-1 RIBBON CABLE ASSY, PRN (26PSN) 0046 112074 LABEL, OPTICS TUBE 0047 112072-2 FRONT HSG BACKPLATE W/ PEMS 0048 112085-2 WIRE ASSY,10.5 0049 112033-1 GUIDE, VISOR 0052 112079-501 PCB ASSY, VPS 0053 112142-501 PCB ASSY, VPS 0053 112049-3 HOUSING, FRONT LEFT 0055 112048-3 HOUSING, FRONT RIGHT 0057 106144-5 NYLINER BEARING 0059 112031-1 SLIDE BRACKET 0060 112018 SPRING VISOR 0062 112081 VISOR WEAR PAD 0063 112082-2 ROD, FINISHED 0064 112061-1 LABEL, VPS REFLECTIVE 0065 112039-1 VISOR BACKPLATE ASSY 0066 112094 FLEX CABLE W/ RINGS 0068 112124-3 EDGE PROTECTOR 0070 112077 RIBBON CABLE CLAMP 0071 112077-2 CABLE CLAMP 0071 112080-4 EDGE PROTECTOR,U CHANNEL 3.14 0072 112063 UPPER SHELF W/ PEMS 0073 112046-2 HOUSING, REAR RIGHT 0074 112044-2 LCD CABLE ASSY (40PSN) 0075 112124-2 EDGE PROTECTOR, 4 0076 112047-2 HOUSING, REAR LEFT 0077 112068-2 LABEL, PAPER LOADING INSTR 0079 112027-4 HSG, PAPER DOOR,PRINTED 0080 112019 THERMAL PAPER ROLL, 2 0081 112024-4 HSG,FRONT COVER,PRINTED 0083 112129-1 LABEL, FRONT COVER LOGO G 0085 106138-6 SCREW, BUTTON HS SOCKET G 0086 112066 LABEL, BACKGRND DEBUG CONN 0088 112078-1 CALIBRATION CAP 0090 106127-1 STANDOFF-SCREW MOUNT 0095 112121 CLIP 0096 112122 EMI SHIELD, REAR 0098 112155 EMI SHELD, CRT 0098 112130 FOAM, PAPER ROLL 0099 236706-3109 FUSE, 160 MA 0100 236706-3112 FUSE- 315 MA 0100

x xx x

x xx xx xx x xx xx xx xx xx xx xx x

x xx xx xx xx xx xx xx xx xx xx x x

x xx x xx x x xx xx xx xx xx xx xx xx

x xx xx xx x xx

x x

1 1 6 1 1 1 4

2 1 2 1 2 5 1 1 1 1 2 1 5 5 1 1

1 1 1 1 2

1 1 2 1

1 10 10 20

4 20

1 60 20 20

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

6 Repair Parts

Part No. Description Bubble Number 115V 230V Recommended

112140-1 JUMPER ASSY RS232 0103

112133-1 FRONT EMI SHIELD 0104

112135 PRINTER ENCLOSURE 0108

112147 PRINTER GASKET 0109

112151 COPPER TAPE 0110

112149 FOAM, BLOCK 0111

112137 BASE SHIELD 0112

112146 TOP EMI SHIELD 0113

112150 FOAM, STRIP 0114

112148 PRINTER ENCLOSURE GASKET 0115

112138-501 SHIELDED RIBBON CABLE ASSY 0116

761077-1 TIE WRAP 0117

106137-2 NUT,8-32 EXTLOCK 0005

106100-51 PHPS 8-32 X .750 0012

106124-4 #4 X.250 LG PPHS SELF TPG 0021

106124-30 SCREW #6 X .375 0026

106105-3 #4 LOCKWASHER,HEL 0038

106100-42 4-40 X.25 SCREW 0039

106100-12 PHPS 8-32 X.281 0041

711776 SCREW,M3 PHPS METRIC 0045

745147 #6 LOCKWASHER-EXTERNAL TOOTH 0050

106100-50 6-32 X .125 PHILLIPS,STL 0051

106124-31 #4 X.250 LG PPHS SELF TPG 0054

106102-27 FHPHPS 6X32X.250 LG 0056

483017 PHPS 6-32 X 5/16 0061

106140-5 6-32 W/EXT WASHER 0067

106140-9 8-32 W/EXT WASHER 0069

106124-36 SCREW .500 AB PAN PHILLIPS 0078

106119-34 .344 HEX SOCKET ST BLACK ANODI 0089

106137-7 NUT 6-32 EXTLOCK 0094

106100-52 PHPS 8-32 X .500 0097

106103-6 WASHER, FLAT 0106

x x x x x x x x x x x

x xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 7 - FDT Assembly Drawings

FDT Assemby Drawings:

112000 Domestic

sh1 Rev D sh2 Rev D sh3 Rev D

112200 International

sh1 Rev B sh2 Rev A sh3 Rev B sh4 Rev B

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

Section 8 - Schematics

Schematics

112106

Schematic, Controller PCB, Patt C

sh1 Rev D sh2 Rev D

112091

Schematic, LCD Module Custom

Circuitry

sh3 Rev C

112037

PCB Assembly, MCU

Rev D

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

Section 9 - Disassembly and Repair CE Model

EXERCISE EXTREME CAUTION WHEN SERVICING THE FDT!

THE MONITOR ASSEMBLY OPERATES ON APPROXIMATELY 10,000 VOLTS!

NOTE: Properly re-install all ESD shields

and ground wires to maintain EMI protection standards!

9.1 REMOVAL OF REAR HOUSING/LCD

9.1.1 Lower paper door.

9.1.2 Remove paper: a) pull lever down b) pull paper out

9.1.3 Remove 4 screws from rear housing.

9.1.4 Lower rear housing/LCD assembly .

Copper ESD shields may have sharp edges. Exercise caution to

avoid cuts!

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 1

Section 9 - Disassembly and Repair CE Model

9.1.5 Disconnect LCD ESD shield from top of printer enclosure. Remove nut with 11/32” socket.

11/32”socket

9.1.6 Disconnect wiring from LCD board: a) Pull Printer Ribbon Cable connect tor J1 from LCD printed circuit board.

9.1.6 Disconnect wiring from LCD board: b)Disconnect 3 connectors (shown

from left to right) Stepper Motor Connector P3, Paper Out Connec tor P2, and Head Up Connector P1.

9.1.7 Cut cable tie shown by arrow in photo. and place rear housing/LCD sub assembly into a clean anit-static bag for temporary storage.

9.1.8 Remove paper door.

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.2 REPLACEMENT OF REAR HOUSING/LCD ASSEMBLY

9.2.1 Reassemble in reverse order with follow ing notes: a) Push Keyed ribbon cable into connector J1 of the LCD module. b) Secure P1, P2, P3 wires to the LCD shield ground strap with a wire tie. c) Restore P1, P2, and P3 connections to the LCD module. d) Ensure that the LCD ESD ground shield stays on the inside of the rear housing as rear housing/LCD sub assembly is closed. See photo.

9.2.2 Plug unit in and turn on

9.2.3 Replace paper roll per instructions in user’s manual.

9.2.4 Close paper door.

NOTE: Factory calibration is not required when replacing the LCD module assembly.

9.3 DISASSEMBLY OF OPTICS

9.3.1 Remove rear housing/LCD sub assembly. (Refer to 9.1)

9.3.2 Remove front housing: a) Remove screw from front housing Use a 3/32” hex key.

b) Pull front housing out

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

Section 9 - Disassembly and Repair CE Model

9.3.3 Remove left and right rear housings: a) Pull clip from top of housings.

Note: Use a screwdriver with a magnetized tip to prevent screw from falling into unit in step (b) below.

b) Remove screw from inside of housings.

9.3.3 Remove left and right rear housings: c) Remove 2 screws that connect each housing to chassis.

9.3.3 Remove left and right rear housings: d)Pull housing up and out of base assembly

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.3.4 Remove visor/browrest assembly: a) Unscrew 4 set screws (7/64” key) b) Pull visor/browrest assembly off.

9.3.5 Remove screw and lockwasher from right side of ground cable.

9.3.6 Remove slide/bracket/ rod assembly: a)Remove screws and lock washers from both ends of the slide rod.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 5

Section 9 - Disassembly and Repair CE Model

9.3.6 Remove slide/bracket/ rod assembly: b)Remove visor backplate from visor guide by lifting out from top, then up.

Caution: Improper removal of the

visor backplate may damage the visor guide (see arrow in photo). Carefully lift the visor backplate away from the unit. Do not pull it away.

9.3.6 Remove slide/bracket/ rod assembly: c)Remove rod from slide-bracket.

Note: Place finger on visor wear pad to

prevent it from falling.

9.3.6 Remove slide/bracket/ rod assembly: d)Remove visor wear-pad and visor spring bracket.

6 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.3.6 Remove slide/bracket/ rod assembly: e)Remove 2 screws. f)Remove bracket.

9.3.7 Remove front left and front right housings: a)Remove two black screws from front of housings.

9.3.7 Remove front left and front right housings: b)Remove the nut and center screw from each housing. Nut also holds EMI shield (Inset). Use 11/32” wrench or socket. c)Remove 2 remaining screws from front left and front right housings.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 7

Section 9 - Disassembly and Repair CE Model

9.3.7 Remove front left and front right housings: d)Spread and lift housings from base.

9.3.8 Lift front housing backplate from optics tube assembly.

9.3.9 Remove shields: a)Remove top shield.(photo). b)Push bottom shield down and away from optics tube assembly.

8 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.3.10 Remove Internal Photodetector (IP).

9.3.11 Remove optics tube assembly: a)Remove 4 screws while supporting optics tube assembly.

9.3.11 Remove optics tube assembly: b)Remove optics tube assembly. c)Put optics tube assembly into a dust-free bag for storage.

d)If necessary, remove foam gasket carefully.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 9

Section 9 - Disassembly and Repair CE Model

9.4 ASSEMBLY OF OPTICS

9.4.1 Replace the optics tube assembly: a)Place foam gasket into position.

Note: Notches on left and right sides of foam

gasket must fit over the tabs.

9.4.1 Replace the optics tube assembly: b)Hold the optics tube assembly with the Internal Photodetector (IP) window on the right side.

c)Position the optics tube assembly onto the Monitor/Chassis assembly until the slotted holes are in the position shown in the photo at right.

9.4.2 Secure Optics Tube and Internal Photodetector (IP). a) Check to make sure optics tube assembly is on top of the CRT metal band and secure it with 4 screws. b) Make sure IP chip surface is clean and attach IP/PCB to optics tube assembly with 2 screws.

NOTE: Use very slight torque to tighten 2

IP/PCB screws.

10 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.4.3 Restore top and bottom ESD shields on the optical tube assembly.

9.4.4 Position the front housing backplate onto the optics tube assembly.

9.4.5 Replace front left and right housings: a)Position housings onto chassis.

Note: make sure shielded cables do not get caught between housings under optics tube assembly. Smooth operation of the visor depends on proper alignment of housings with the optics tube assembly. Assemble and align the notches in the housings with the optics tube assembly as shown in the photo at right.

9.4.5 Replace front left and right housings: b)Install slide/bracket rod assembly . See 9.3.6) c)Install 2 black screws into front housings.(See 9.3.7) d)Fasten left and right housings with 3 screws each. Use the long screw where shown in photo at right.

9.4.6 Install Rear EMI shield: a)Shield must contact but not move BLUE CAP of CRT. Put shield over screws. Use 11/32” wrench or socket.

9.4.7 Install Rod into slide bracket: a)Put visor spring and visor wear pad into position.

Note: small metal tabs at end of spring face toward unit.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 11

Section 9 - Disassembly and Repair CE Model

9.4.7 Install Rod into slide bracket: b)Hold wear pad in place and slide the rod (as shown in photo) in from the left side of bracket. c)Test this assembly by sliding the rod left and right. The rod must

engage the detent at each end of the stroke.

d)Put rod in center position.

9.4.8 Install visor backplate: a)Put visor backplate into notch in visor guide as shown in photo. b)Put visor backplate over the slide bracket/rod assembly. (See 9.3.6 b) c)Attach visor backplate to rod with screws and lockwashers. (See

9.3.6 a) d)Restore ground cable connection with screw and External tooth lockwasher. (See 9.3.5)

9.4.9 Install visor/browrest sub assembly: a)Slide the visor backplate to right. b)Put visor/browrest onto visor backplate with ground cable in

position shown in photo.

c)Secure with 4 set screws. d)Test this assembly by sliding left and right. The Visor must:

1)move smoothly

2)click (detent) at end of stroke.

3)not rub the ground cable.

12 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.4.10 Install left and right rear housings: a)Put side housing bottom tabs into slots in base.

Note: See photo inset for foam block reference. Make sure foam block is in place before installing rear right housing .

b)Secure each cover with 2 screws (See 9.3.3 c) c)Fasten covers inside upper section with one screw(See 9.3.3 b)

9.4.10 Install left and right rear housings: d)Put clip on covers.

Right Rear Housing

Base

9.4.11 Install front housing: a)Align tabs of front housing with slots in base and secure with one central screw. (See 9.3.2 a)

9.4.12 Install rear housing/LCD assembly: a)Follow instructions in Section 9.2

NOTE: If a new Internal Photodetector (IP) was installed, factory calibration is required.

SERVICE MANUAL 112120 REV B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 13

Section 9 - Disassembly and Repair CE Model

9.5 REMOVAL OF PRINTER

9.5.1 Remove rear housing/LCD assembly (See9.1)

9.5.2 Remove left and right rear housings (See9.3.3)

9.5.3 Remove ribbon cable to printer module . (See photo.)

9.5.4 Remove 4 screws (with external tooth washers) which hold printerassembly to chassis.

9.5.5 Remove printer assembly from chassis.

14 HUMPHREY FDT VISUAL FIELD INSTRUMENT

edge protector

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.5.6 Remove printer: a)Remove 2 screws.

9.5.6 Remove printer: b) Remove printer from housing.

9.6 INSTALLING PRINTER

9.6.1 Reassemble in reverse order of disassembly with special attention to the following Notes.

Note: Make sure copper clips are installed in position shown in upper photo at right. They should snap into small holes in chassis.

Note:Make sure base shield tabs are in position relative to bottom of printer assembly as shown in lower photo at right.

Note: Make sure circular edge protector is installed on printer assembly. (See 9.5.5)

SERVICE MANUAL 112120 REV B

BASE SHIELD

View looking up under printer assembly.

HUMPHREY FDT VISUAL FIELD INSTRUMENT 15

Section 9 - Disassembly and Repair CE Model

9.7 REMOVAL OF MCU PCB

9.7.1 Remove rear housing/LCD assembly. (See 9.1)

9.7.2 Follow Remove Optics steps 9.3.1 to

9.3.8 (Lift front housing backplate from optics tube assembly.) Do not remove optics tube assembly.

9.7.3 Remove Printer (See 9.5)

9.7.4 Remove base shield. See photo at right.

9.7.5 Disconnect wiring: a)Open flap on front EMI shield foil as shown in Step 9.7.5. b)Remove Visor Position Sensor PCB (VPS)ground wire ring terminal c)Remove Patient Response Button (PRB) ground wire ring terminal. d)Unplug J 107 e)Unplug J105

f)Ground wire ring terminal for front housing back plate. See inset.

9.7.5 Disconnect wiring: d)Unplug P5 from Monitor Board. e)Disconnect transformer purple wire pair from connector located near transformer.

EMI Shield over MCU/PCB

16 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.7.4 Remove Chassis/Monitor/MCU assy: a)Use 11/32” socket and extension to remove 4 nuts holding chassis to the base.

9.7.4 Remove Chassis/Monitor/MCU assy: b)Tilt chassis/Monitor/MCU assy.

forward.

11/32”

CAUTION:Screw shown in photo will cause

difficulty in removing chassis assembly from base. Do not apply force that might press MCU board (under foil) against base.

c)Lift assembly straight up from base and lay on table with copper foil shield facing up.

9.7.5 Remove MCU/PCB from Chassis: a)Remove 4 screws holding shield over MCU/PCB.

SERVICE MANUAL 112120 REV B

top right screw

HUMPHREY FDT VISUAL FIELD INSTRUMENT 17

Section 9 - Disassembly and Repair CE Model

9.7.5 Remove MCU/PCB from Chassis: b)Lift EMI shield up.

9.7.5 Remove MCU/PCB from Chassis: c)Remove Internal jPhotodetector (IP) ground wire ring terminal from front ESD shield as shown in photo. d)Remove front ESD shield.

EMI SHIELD

IP ground wire ring terminal

9.7.5 Remove MCU/PCB from Chassis: e)Disconnect J7 (shown in photo) and J102 ribbon cable connectors, IP connector J110 and J1. f)Remove 4 screws with split lockwashers from MCU/PCB. g)Gently remove MCU/PCB and store in ESD bag .

CAUTION: There are Board to Board pin

connectors (J108 and J109 )at the top and bottom of the MCU/ PCB. Separate the boards carefully.

front ESD shield

18 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.8 INSTALLING MCU/PCB

NOTE: Use PC utility to initialize/set

NVRAM when installing new MCU/PCB. Factory calibration is also required. See Section 3 pg. 2 for additional information on PC utility.

9.8.1 Install MCU/PCB a) Insert Connector,PCB to PCB (pn

112086) into top and bottom sockets of new MCU/PCB. b) Align the pins with the sockets of Monitor Board in chassis and gently press boards together.

9.8.1 Install MCU/PCB

c) Secure with 4 screws. d) Restore connections. e) Install front ESD shield.

9.8.1 Install MCU/PCB g) Attach copper EMI shield to chassis

with 4 screws.

Note: Make sure to attach ground wire on bottom right side of EMI shield with lower right screw as shown in photo.

SERVICE MANUAL 112120 REV B

lower right screw

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Section 9 - Disassembly and Repair CE Model

9.8.2 Install Chassis/Monitor/MCU assy: a)Important:Make sure wires trans former wires and PRB wires do not get caught under chassis. b)Tilt the chassis assembly forward. and lower chassis onto studs. d)Secure the chassis with 4 nuts.

9.8.3 Complete the installation of the MCU/ PCB by following steps 9.7.1 - 9.7.3 in reverse order.

NOTE: Use PC utility to initialize/set NVRAM when installing new MCU/

PCB. Factory calibration is also required. See Section 3 pg. 2 for additional information on PC utility.

9.9 INSTALLING A REPLACEMENT CHASSIS/MONITOR ASSEMBLY

9.9.1 Secure ribbon cable clamps to chassis over ribbon cables.

9.9.2 Install MCU/PCB to new chassis.

9.9.3 Reassemble unit. Follow steps 9.7.1 through 9.7.3 in reverse order.

NOTE:The chassis/monitor assembly is a

matched set. If either the CRT or the Monitor PCB fails, a new matched chassis/monitor assembly must be installed or the FDT will not function properly. DO NOT ADJUST POTS!

9.9.4 Perform a Factory Calibration only if you installed a new Chassis/Monitor.

9.10 REMOVAL OF TRANSFORMER

9.10.1 Remove rear housing/LCD assy. (Sect. 9.1.1 - 9.1.8)

9.10.2 Remove front housing. (Sect. 9.3.2)

9.10.3 Remove left and right rear housings. and shield by CRT . (Sect 9.3.3)

9.10.4 Remove printer enclosure and shield. See Sect9.5 and photo at right.

9.10.5 Disconnect J1 and J105 from MCU.

9.10.6 Disconnect P5 from Monitor Board.

9.10.7 Remove Transformer from base. a)Remove 4 nuts with 11/32” socket.

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BASE Shield

SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.10.7 Remove Transformer: b)Disconnect transformer wires from power entry module. c)Lift transformer from base.

9.11 INSTALLING TRANSFORMER

9.11.1 Install transformer in reverse order of removal.

9.11.2 Restore wiring connections. a)Refer to Sheet 2 of Drawing #112200 for correct placement of transformer wires to power entry module.

NOTE: Make sure the notch in the copper shield (Bubble No. 112 on drawing 112200 sheet 1 of 4) is on lower left side.

9.12 REMOVAL OF PRB JACK

9.12.1 Remove rear housing/LCD assy. (Sect. 9.1.1 - 9.1.8)

9.12.2 Remove front housing. (Sect. 9.3.2)

9.12.3 Remove left and right rear housings. (Sect 9.3.3)

9.12.4 Remove printer enclosure shelf. (Sect 9.5.3)

9.12.5 Disconnect purple wire connector at transformer and J105 and ground from MCU.

9.12.6 Disconnect P5 from Monitor Board.

9.12.7 Remove Chassis/Monitor assembly. (Sect. 9.7.4)

9.12.8 Unscrew Ring Nut of PRB Jack with T-15145 (See Photo)

9.13 REPLACEMENT OF PRB JACK

9.13.1 Install new PRB Wire Assembly (jack and wire harness) in reverse order of disassembly.

9.14 REMOVAL OF POWER ENTRY MODULE

9.19.1 Remove Chassis/Monitor assembly per above steps 9.12.1-9.12.7.

9.19.2 Separate Housing and Base Plate: a)Remove 4 screws from rubber feet. b)Lift housing from base.

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Section 9 - Disassembly and Repair CE Model

9.19.3 Remove wires from module.

9.19.4 Slide power entry module up and out of base plate.

9.15 REPLACEMENT OF POWER ENTRY MODULE

9.15.1Install power entry module. a)Press power entry module into

base plate assembly.

9.15.2 Restore wiring connections. a)Refer to Sheet 2 of Drawing #112000 for correct placement of wires to power entry module.

9.15.2 Replace the housing in reverse order. (See 9.19.1- 9.19.2)

9.16 REMOVAL OF VISOR POSITION SENSOR BOARD (VPS/PCB).

9.16.1 Disassemble optics to VPS/PBC (See 9.3)

9.16.2 Remove VPS PCB a)Disconnect front housing backplate ground. Open front shield to remove VPS connector J107 and ground terminal as shown in Section 9.7.5. b)Remove screw . See photo at right. c)Disconnect VPS/PCB from front housing backplate.

9.17 REPLACEMENT OF VPS PCB

9.17.1 Install VPS PCB in reverse order.

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SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.18 REMOVAL OF INTERNAL PHOTODETECTOR (IP)

9.18.1 Remove front ESD shield. (follow step

9.7.1 up to and including step 9.7.5 b.

9.18.2 Unplug IP connector J110 from MCU/ PCB

9.18.3 Remove 2 screws from IP/PCB .

9.19 REPLACEMENT OF INTERNAL PHOTODETECTOR (IP)

9.19.1 Install IP in reverse order of removal. Make sure sensor is clean.

NOTE:If you replaced the IP with a new IP Factory Calibration is Required.

9.20 REMOVAL OF LCD MODULE/ KEYPAD

Copper ESD shields may have sharp edges. Exercise caution

to avoid cuts!

9.20.1 Remove Rear housing/LCD subassembly. Follow instructions in Sect. 9.1.1 through 9.1.6.

9.20.2 Remove LCD module. a)Unscrew 4 screws. See photo.

9.20.2 Remove LCD module. b)Remove 11/32” nut holding ground wire ring terminal. c)Carefully lift shield and module together from housing.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 23

Section 9 - Disassembly and Repair CE Model

9.20.3 Remove keypad a)Lift keypad from LCD shield.

9.21 REPLACEMENT OF LCD MODULE/ KEYPAD

9.21.1 Perform LCD module/keypad removal in reverse order.

NOTE: Install plastic insulating washer

in position as shown in photo. This screw prevents shorting of adjacent component and is found in both CE and non CE units.

9.22 REMOVAL OF VISOR PAD

9.22.1 Remove visor/browrest sub assembly (Sect. 9.3.4)

9.22.2 Remove visor pad a)Pull and press simultaneously in directions of arrows as shown in photo. b)Repeat with other end of visor pad.

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SERVICE MANUAL 112120 REV B

Section 9 - Disassembly and Repair CE Model

9.23 INSTALLING VISOR PAD

9.32.1 Install visor pad. a)Place visor into visor as shown.

b)Press loops over posts on inside of visor.

9.23.2 Replace visor/browrest sub assembly (Sect. 9.9.9)

9.24 REMOVAL OF ACRYLIC LENSES and OPTICS TUBE WINDOW

9.29.1 Remove optics tube assembly (Sect. 9.3)

9.29.2 Remove optics tube housing: a)Remove screws that hold housings together. b)Carefully pull one housing off.

9.29.3 Remove acrylic lenses and or optics tube window by holding edges and gently sliding them from the optics tube.

9.29.4 If lenses or optics tube window are

dirty, clean with a swab and alcohol and air dry.

If a lens cannot be cleaned, install a clean replacement lens.

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HUMPHREY FDT VISUAL FIELD INSTRUMENT 25

Section 9 - Disassembly and Repair CE Model

9.25 INSTALLING ACRYLIC LENSES and OPTICS TUBE WINDOW.

NOTE:Since replacement lenses and window may have slightly different light transmittance characteristics , it is important to perform Factory Calibration.

9.25.1 Assure that all lenses have foam tape on edges. See Drawing#112000.

9.25.2 Clean housings with air.

9.25.3 Put lenses and optics tube window into one optics tube.

9.25.4 Assemble housings together. a)Slide other optics tube over lenses. b)Replace screws.

9.25.5 Reassemble optics (Sect. 9.4)

9.25.6 If any combination of new lenses and/or optics tube window have been installed, perform factory calibration.

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SERVICE MANUAL 112120 REV B

Zeiss Humphrey FDT User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Help Information:

Important Safety Warnings

Incoming Inspection

Tools Required for Service

Loading Software for FDT

Important Shipping

Calibration Limits Information

Product Updates

Power On Self Test

POST Test Key

FDT Terminology

Error Messages

4.3 DISASSEMBLY OF OPTICS

4.4 ASSEMBLY OF OPTICS

4.5 REMOVAL OF PRINTER

4.6 INSTALLING PRINTER

4.7 REMOVAL OF MCU PCB

4.8 INSTALLING MCU/PCB

4.10 REMOVAL OF TRANSFORMER

4.11 INSTALLING TRANSFORMER

4.12 REMOVAL OF PRB JACK

4.13 REPLACEMENT OF PRB JACK

4.17 REPLACEMENT OF VPS/PCB

4.19 REPLACEMENT OF IP/PCB.

4.22 REMOVAL OF VISOR PAD

4.23 INSTALLING VISOR PAD

Key to Repair Parts List

Schematics

9.1 REMOVAL OF REAR HOUSING/LCD

9.3 DISASSEMBLY OF OPTICS

9.4 ASSEMBLY OF OPTICS

9.5 REMOVAL OF PRINTER

9.6 INSTALLING PRINTER

9.7 REMOVAL OF MCU PCB

9.8 INSTALLING MCU/PCB

9.10 REMOVAL OF TRANSFORMER

9.11 INSTALLING TRANSFORMER

9.12 REMOVAL OF PRB JACK

9.13 REPLACEMENT OF PRB JACK

9.17 REPLACEMENT OF VPS PCB

9.22 REMOVAL OF VISOR PAD

9.23 INSTALLING VISOR PAD