Zeiss Humphrey FDT User manual

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

+ 68 hidden pages