Zeiss Humphrey FDT User manual

Name: Zeiss Humphrey FDT
Brand: Zeiss
SKU: 6507538
Rating: 4 (3 reviews)

4 (3)

	Eye Care Menu	Note: Drawings and Schematics are
		not available in this revision.
	Operator Manual	not available in this revision.
	Operator Manual
		HUMPHREY
	FDT Visual Field Instrument

SERVICE MANUAL

Includes CE Model

Part Number 112120	Copyright 1997
Revision B October 1997	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	5-36574	10/21/97	RJS
112120	B	Limits and Error Messages.	5-36574	10/21/97	RJS
		Limits and Error Messages.

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
Incoming Inspection									1
Tools Required for Service and Factory Calibration and Software Uploading			2

Factory Calibration for Software Version 1.20 or Higher					3
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
Important Shipping Information						12
Calibration	Limits Information						13
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 ContÕd
	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 product warranty.

Read and understand all safety warnings and service notes printed in this Service Manual and the UserÕs 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 UserÕs 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 UserÕs 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.

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.

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

Important Safety Warnings

and Service Notes

Photo 1

Photo 2

Photo 3

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

B .REV 112120 MANUAL SERVICE

5 INSTRUMENT FIELD VISUAL FDT HUMPHREY

MAIN MENU ARCHITECTURE VER. 2.10

RUN

PATIENT

TESTS

RUN DEMO.

FDT MAIN

**ADVANCE PAPER

UTILITIES

ENTER

PATIENT

AGE

+10 years -10 years + 1 year

ACCEPT SETTING

SET-UP

INSTRUMENT

RUN SELF

CAL.

INSTRUMENT

TESTS MENU

** AFTER TEST PERFORMED, WILL READ	ABOUT FDT
LAST PATIENT RESULTS

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

BUTTONS

TEST PRB

INPUTS VIEWPORT

POS

SELECT

LANGUAGE

OPTIONS

RESET TO

DEFAULTS

TEST LCD

CHECKERBOARD

BLANK SCREEN

FULL SCREEN

DIXIE PATTERN

LCD MEMORY

BACKLIGHT (ON/OFF)

TEST VIDEO

TEST	TEST
OUTPUTS	SPEAKER
TEST
SERIAL	TEST
PORT	PRINTER
	MENU
TEST A/D
CIRCUITRY

TEST VIDEO

SYSTEM

AMBIENT

LIGHT

CHECK

CALIBRATION

CHECK

FACTORY

CALIBRATION

RUN

PRINTOUT

TEST

ADVANCE

PAPER

Printer

Status

Information General - 1 Section

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

Incoming Inspection

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

4)Perform ÒPRINT SET-UP REPORTÓ if possible, and keep for reference.

5)Perform Cleaning/Disinfection per instuctions in UserÕs 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 - 2Ó length #1 Phillips screwdriver - 4Ó length #2 Philips screwdriver - 4Ó length 1/4Ó drive ratchet with 1/4Ó extender 11/32Ó socket

3/32Ó hex key 7/64Ó hex key

Adjustable torque driver - 2 - 14 in/lbs range Bits for Torque Driver:

#1 Phillips

#2 Phillips 3/32Ó hex 7/64Ó hex

1/4Ó 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 - 11/32Ó

T15145 - for PRB connector

T15104 - Calibrator and Software Floppy Disc (see Photo 1 at left)

T15810Serial 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

Photo 1b

2 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

Upgrade recommendation: Upgrade all re-
turned FDTÕs with Software Version 2.10. Perform	Factory Calibration
Factory Calibration Process.	for Software Version.
	1.20 or higher
Start Factory Calibration Process:
1 Turn FDT unit OFF.

2Connect 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)
4	Tilt FDT on its side to remove label over Calibration/	Photo 3
4	Tilt FDT on its side to remove label over Calibration/
	Software loading port J2.

5Align threaded studs of connector board with the two holes near port J2 as shown in Photo 4.

6Insert T 15102 into port J2 as shown in Photo 5. Hookup should be as shown in Figure 1 below.

	Fig. 1	Photo 4
		Photo 4
	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.
	8 Turn the FDT ON and view the menu on the LCD:	Photo 5
	a) Press button next to UTILITIES MENU	Photo 5
	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 Cali-
	brate utility for more information.
	9 Press any button to indicate that you have placed	Photo 6
	the factory calibrator on the view port.	Photo 6
	the factory calibrator on the view port.

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 3

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
	in this section.
	(End of Factory Calibration Process)

4 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

Start Software Loading Process:
1 Connect the ribbon cable to the ICD Cable	Loading Software for FDT
1 Connect the ribbon cable to the ICD Cable
connector as shown in Photo 7 at right.	Note: FDT software is not
	Note: FDT software is not
Note: a) 2 Pins at right are not used	Mac compatible.

b)Align the red wire of the ribbon cable with the red arrow on ICD connector.

2Connect the ribbon cable to the connector board as shown in Photo 8.

3Connect ICD connector to the PC Parallel Port . See Figure 2 below.

Photo 7

Figure 2

4Insert 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.

			Photo 8
Note: Whenever installing a new MCU/PCB and
	loading highest revision software, verify proper
	hardware (marked on MCU/PCB) version using
	ÒABOUT FDTÓ.	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	Photo 9 FDT LCD Screen
MCU/PCB Rev 504		September 1997
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

3.1Plug in PRB.

3.2Turn unit on. After approximately 10-15 seconds the unit will complete self diagnostics and emit two double beeps. The FDT main menu will appear.

3.3Press the button next to UTILITIES MENU.

3.3.1Check the intensity adjustment.

a)Press the button pointing downward. The LCD contrast will decrease.

b)Press the button pointing upward. The LCD contrast will increase.

c)Use both buttons as needed to return to usable LCD contrast.

6 HUMPHREY FDT VISUAL FIELD INSTRUMENT

SERVICE MANUAL 112120 REV. B

Section 2 - Service

3.3.2Press the button next to ABOUT 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.

3.3.3Press the green button on the bottom left. This should bring you back to the UTILITIES MENU.

3.4Press the button to the left of

INSTRUMENT TESTS MENU.

3.4.1Press the button next to

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 position 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.

3.4.2Press the green button on the bottom left to return to

INSTRUMENT TESTS MENU.

Final Testing

(page 2 of 6)

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 7

Section 2 - Service

Final Testing

(page 3 of 6)

3.5Press the button next to TEST OUTPUTS.

3.5.1Press 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

3.5.2Press the button next to TEST

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 Series grating pattern in the center of the viewing area will be visible.

c)Press the Green button to return to TEST VIDEO MENU.

3.5.3Press the button next to AMBIENT

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.

3.5.4Put 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.

Final Testing

(page 4 of 6)

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 9

Final Testing

Section 2 - Service

Final Testing

(page 5 of 6)

Photo 10

3.6Press the button next to TEST SPEAKER.

3.6.1There will be increasing tones.

3.7Press the button next to TEST PRINTER

MENU.

3.7.1The 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.

3.7.2Press the button next to ADVANCE PAPER. The paper will

advance about 1-2 inches beyond the slot in the paper door.

3.7.3Press the button next to PRINTER

STATUS. ÒPRINTER OKÓ message will appear.

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

MENU.

3.8Press the button next to TEST SERIAL PORT.

3.8.1Press any of top four buttons to execute test.

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

3.8.3Press the green button to return to

INSTRUMENT TESTS MENU.

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

3.8.5Press the button next to TEST SERIAL PORT.

a)Press any of top four buttons to execute tests.

b)LCD will display:

DATA TRANFER PASSED HANDSHAKING PASSED

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SERVICE MANUAL 112120 REV. B

Section 2 - Service

3.8.6Press the green button twice to return to INSTRUMENT TESTS

MENU.

3.8.7Remove T-15810.

3.9Press the button next to A/D CIRCUITRY.

3.9.1A reading will come up for Mean gray and printhead tem-

perature. If the unit fails this test a malfunction error will appear.

3.10Perform a screening test to check unit operation.

3.11Turn unit off.

4.Agency testing

4.1Hypot

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.

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.

Final Testing (Page 6 jof 6)

Hypot, Ground Continuity,

and Leakage Current

Testing

(For In-House use only.)

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 11

Section 2 - Service

Important Shipping

Information

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 UserÕs Guide)
	prevents the paper roll from unwinding
	during shipping.
	Return all of the customerÕs
	accessories.

Paper roll foam prevents un-winding during shipping

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	Expected	Expected	SW	Comments/Description	F.C.**	S.F.***
		Limit	Min	Max	Limit
		Min			Max

SCAN LINE	*90	6	*60	*110	235	Reflects mechanical alignment of	X
(internal)	*90	6	*60	*110	235	photodetector to CRT.	X
(internal)						photodetector to CRT.

GAMMA	*2.35	1.0	*2.2	*2.5	<3.0	CRT response correction		X
GAMMA	*2.35	1.0	*2.2	*2.5	<3.0	exponent.		X
						exponent.

REFERENCE	NA	0	*15	*60	255	Adjusts for CRT aging.		X
POT	NA	0	(new CRT)	(new CRT)	255	( *150 expected max on old CRT)		X
POT			(new CRT)	(new CRT)		( *150 expected max on old CRT)

INTERNAL						Absolute value read from Internal
INTERNAL	*2250	0	*1500	*3000	4095	photodetector ADC when CRT is	X
TARGET	*2250	0	*1500	*3000	4095	photodetector ADC when CRT is	X
TARGET						200 c/m^2.
						200 c/m^2.

DC OFFSET	30	0	*10	*50	1023	DC offset on internal	X
DC OFFSET	30	0	*10	*50	1023	photodetector signal.	X
						photodetector signal.

	Internal					Absolute value read from Internal
INTERNAL	Internal		Internal	Internal		photodetector ADC when CRT is
INTERNAL	Target	0	Internal	Internal	4095	photodetector ADC when CRT is
PEAK	Target	0	Target - 40	Target + 40	4095	as close to 200 c/m^2 as the
PEAK			Target - 40	Target + 40		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	40 min, 70 nom, *100 max	Two passes: Second pass should be within 16 of first.
Line

External Photosensor	3000+/- 20	External target 3000 = 200c/m^2. This is how close the
External Photosensor	3000+/- 20	reference pot gets to 200 c/m^2.
		reference pot gets to 200 c/m^2.

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

Internal Photosensor	Same as SCAN LINE in table	Same as in table (A) above.
Stop Line	(A) above.	Same as in table (A) above.
Stop Line	(A) above.

Internal Photosensor	Same as INTERNAL TARGET	Same as in table (A) above.
Internal Photosensor	in table (A) above.	Same as in table (A) above.
	in table (A) above.

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

SERVICE MANUAL 112120 REV. B

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	Same as INTERNAL TARGET	Same as in table (A) above.
Internal Photosensor	in table (A) above.	Same as in table (A) above.
	in table (A) above.

	82 max allowed by SW	Keep unit as dark as possible. If this fails in dark, unit
Ambient Light	82 max allowed by SW	is broken, or DC offset is bad - Factory calibration
Ambient Light	(2% of full brightness)	is broken, or DC offset is bad - Factory calibration
	(2% of full brightness)	needed.
		needed.

REFERENCE POT	Same as REFERENCE POT in	Same as in table (A) above.
REFERENCE POT	table (A) above.	Same as in table (A) above.
	table (A) above.

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

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

	Second Column is limited to 120	First column is linear ramp target value written to
Linearity	Second Column is limited to 120	DAC. Second column is photodetector reading
Linearity	(3% deviation from straight line)	DAC. Second column is photodetector reading
	(3% deviation from straight line)	deviation from the linear ramp. Scale is 127 - 4095.
		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	DOMESTIC FDT UNITS :
Effectivity	S/N Cut-In	Description of Changes for 00710-11
		Description of Changes for 00710-11

		Sales Demo Units (all S#>9700199 and
		9701000) . Monitor needs rework at some time
7/97	S#9700200	to extend calibration life.
		SW Version 8.30.
		HW Version 50300 (MCU PCB 112037-503)

		Initial Production units for end users (all
8/97	S#9701000	S#>9701000). SW Version 1.20.
		HW Version 50300 (MCU PCB 112037-503)

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

9/11/97	S#9701199	HW version 50400 (MCU PCB 112037-504 for
9/11/97	S#9701199	CE)
		CE)

9/15/97	~S#9701210	Calibration Caps (pn112078-1) Started shipping
		with instruments.
10/3/97	S#9701294	SW Version 2.10 (Language translations)

		CE INTERNATIONAL FDT UNITS :
Effectivity	S/N Cut-In	Description of Changes for 00710-X1 (X=2-9)
Effectivity	S/N Cut-In	Note:Domestic S#'s have a 0 in the 3rd digit,
		Note:Domestic S#'s have a 0 in the 3rd digit,
		International S#'s have a 3)

		Initial International Production units (all
9/97	S#9731000	S#'s>9731000)
9/97	S#9731000	SW Version 1.20.
		SW Version 1.20.
		HW version 50400 (MCU PCB 112037-504 for CE)

	S#9731025
	(also
10/3/97	S#9731019	SW Version 2.10 (language translations)
10/3/97	and	SW Version 2.10 (language translations)
	and
	S#9731023
	are Ver. 2.10

SERVICE MANUAL 112120 REV. B

HUMPHREY FDT VISUAL FIELD INSTRUMENT 15

+ 68 hidden pages

Zeiss Humphrey FDT User manual

Help Information:

Important Safety Warnings

MAIN MENU ARCHITECTURE VER. 2.10

Incoming Inspection

Factory Calibration Process.

Loading Software for FDT

Final Testing

Important Shipping

Calibration Limits Information

Product Updates