Huvitz CRK-7000 User manual

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Service Manual
Auto Ref/Keratometer CRK-7000

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Auto-Ref/Keratometer CRK-7000
Contents
I. Important Notice ................................................................................................................ 3
II. Introduction ...................................................................................................................... 5
1. Outline of the instrument .......................................................................................... 5
2. Classification ............................................................................................................. 5
III. Safety Information ........................................................................................................... 6
1. Introduction ............................................................................................................... 6
2. Safety Symbols ......................................................................................................... 7
3. Environment Factors ................................................................................................. 8
4. Safety Precautions .................................................................................................. 10
IV. Product Outline .............................................................................................................. 13
1. Nomenclature .......................................................................................................... 13
2. Optical System ........................................................................................................ 16
3. Electrical System .................................................................................................... 19
4. Principles of Measurement ..................................................................................... 26
V. Repair Standard .............................................................................................................. 29
1. Replacing expendables ........................................................................................... 29
2. Checking and control .............................................................................................. 31
3. CRK-7000 Total ass’y ............................................................................................ 48
VI. Troubleshooting ............................................................................................................. 66
VII. Technical Materials ....................................................................................................... 73

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I. Important Notice
As this product malfunction by the electromagnetic waves originating from mobile
phones, wireless sets, remote-controlled devices, etc, please keep the machine
away from objects which can affect it.
The information in this publication has been carefully checked and is believed to
be entirely accurate at the time of publication. SHANGHAI HUVITZ assumes no
responsibility, however, for possible errors or omissions, or for any consequences
resulting from the use of the information contained herein.
Important Notice
Potential electromagnetic or other interference between medical equipments
and other devices being operated together in the same environmental may
expert an adverse influence on functioning of the medical equipment. Non-
medical equipments not in compliance with the requirements of EN 60601-1
and EN 60601-1-2 should not be used together in the same environmental
as the medical equipments
This equipment has been tested and found to comply with the limits for medical
devices in IEC 60601-1-2:2001. These limits are designed to provide reasonable
protection against harmful interferences in a typical medical installation.
Power cord
For use of equipment in rated voltage less than 125Vac, minimum 6Am Type SJT
or SVT, 18/3AWG, 10A, max 3.0m long : One end with Hospital Grade Type,
NEMA 5-15P, The other end with appliance coupler. For use of equipment in
rated voltage less than 250Vac, minimum 6A, Type SJT or SVT, 18/3AWG, 10A,
max 1.0m long : One end terminated with blade attachment plug(HAR) Type,
NEMA 6-15P.
This product may malfunction due to electromagnetic waves caused by portable
personal telephones, transceivers, radio-controlled toys, etc. Be sure to avoid
having objects such as, which affect this product, brought near the product.
! WARNING

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The information in this publication has been carefully checked and is believed to
be entirely accurate at the time of publication. SHANGHAI HUVITZ assumes no
responsibility, however, for possible errors or omissions, or for any consequences
resulting form the use of the information contained herein.
SHANGHAI HUVITZ reserves the right to make changes in its products or
product specifications at any time and without prior notice, and is not required
to update this documentation to reflect such changes.

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II. Introduction
1. Outline of the instrument
Auto Ref/Keratometer CRK-7000 is the equipment to provide the information of
Spherical, Cylindrical and Axis while measuring the refraction of examinee’s eyes.
Auto Ref/Keratometer CRK-7000 is the equipment that can measure the corneal
curvature of examinee. In addition, it can measure PD (=distance in between
pupils) and pupil size.
CLBC (Contact Lens Base Curve) measurement is also a basic function of this
product.
2. Classification
Classification of product: 2nd Grade Medical Instrument
Resistance against electric shock: Class I (earthed)
Protection class against electric: Type B
-Protection against harmful ingress of water : Ordinary . IPX0
-Degree of safety in the presence of a flammable anesthetics mixture with
air or with oxygen or with nitrous oxide: Not suitable for use in the
presence of a flammable anesthetics mixture with air or with oxygen or with
nitrous oxide. Mode of operation : continuous

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III. Safety Information
1. Introduction
Safety is everyone’s responsibility. The safe use of this equipment is largely
dependent upon the installer, user, operator, and maintainer. It is imperative that
personnel study and become familiar with this entire manual before attempting to
install use, clean, service or adjust this equipment and any associated
accessories. It is paramount that the instructions contained in this manual are
fully understood and followed to enhance safety to the patient and the
user/operator. It is for this reason that the following safety notices have been
placed appropriately within the text of this manual to highlight safety related
information or information requiring special emphasis. All users, operators, and
maintainers must be familiar with and pay particular attention to all Warnings and
Cautions incorporated herein.
“Warning“ indicates the presence of a hazard that could result in severe
personal injury, death or substantial property damage if ignored.
NOTE
“Note” describes information for the installation, operation, or maintenance
of which is important but hazard related if ignored.
“Caution” indicates the presence of a hazard that could result in minor
injury, or property damaged if ignored.
!WARNING
!CAUTION

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2. Safety Symbols
The International Electrotechnical Commission (IEC) has established a set of
symbols for medical electronic equipment which classify a connection or warn of
any potential hazards. The classifications and symbols are shown below.
Save these instructions
I and O on power switch represent ON and OFF
respectively.
Type B Isolated patient connection.
This symbol identifies a safety note. Ensure you
understand the function of this control before using it.
Control function is described in the appropriate User’s or
Service Manual.
Identifies the point where the system safety ground is
fastened to the chassis. Protective earth connected to
conductive parts of Class I equipment for safety
purposes.

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3. Environment Factors
Please avoid the environment below for the operation and storage of the
equipment.
Where the equipment is exposed to water vapor.
Don’t operate an equipment with a wet hand.
Where the equipment is exposed to direct sunlight.
Where the temperature changes extremely.
Normal operating temperature range is from 10°C to 40°C,
Humidity is from 30% to 75%.
Where it is near the heat equipment.
Where the humidity is extremely high or there is a
ventilation problem.
Where the equipment is subject to excessive shocks or
vibrations.
Where equipment is exposed to chemical material or
explosive gas.
Be careful not to be inserted dust, especially, metal.
Don’t disassemble the product or open. We aren’t
responsible for it for nothing.
Be careful not to close the fan located on the lateral or
back side of the equipment.

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Don’t plug the AC power cord into the outlet before the
connection between devices of the equipment is
completed.
This can generate the defect.
Pull out the power cord with holding the plug, not the
cord.
For the normal operation of the machine,
please keep the ambient temperature is 10℃ ~ 35℃, humidity is 30%~75%, and
atmospheric pressure is 800 ~ 1060 hpa.
For the transportation of the machine,
please keep the ambient temperature is -40℃ ~ 70℃, humidity is 10%~95%,
and atmospheric pressure is 500 ~ 1060 hpa.
For the storage of the machine,
please keep the ambient temperature is -10℃ ~ 55℃, humidity is 30%~75%,
and atmospheric pressure is 700 ~ 1060 hpa.
Avoid environments where the equipment is exposed to excessive shocks or
vibrations.

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4. Safety Precautions
This equipment has been developed and tested in conformity with domestic &
international safety standards and regulations, which guarantees the high stability
of this product. This guarantees a very high degree of safety for this device. The
legislator expects us to inform the user expressively about the safety aspects in
dealing with the device. The correct handling of this equipment is imperative for
its safe operation. Therefore, please read carefully all instructions before
switching on this device. For more detailed information, please contact our
Customer Service Department or one of our authorized representatives.
(1) This equipment must not be used (a) in an area that is in danger of
explosions and (b) in the presence of flammable, explosive, or volatile
solvent such as alcohol, benzene or similar chemicals.
(2) The device should neither be kept nor installed in the place with high
humidity. For the optimal operation, the humidity should be at the
range of 30%~75%. The machine should not be exposed to the place
where water splashes, drips or sprays. Do not place containers
containing fluids, liquids, or gases on top of any electrical equipment
or devices
(3) The equipment must be operated only by, or under direct supervision
of properly trained and qualified person/s.
(4) Modifications of this equipment may only be carried out by SHANGHAI
HUVITZ’s service technicians or other authorized persons.
(5) Customer maintenance of this equipment may only be performed as
stated in the User’s Manual and Service Manual. Any additional
maintenance may only be performed by SHANGHAI HUVITZ’s service
technicians or other authorized persons.
(6) The manufacturer is only responsible for effects on safety, reliability,
and performance of this equipment when the following requirements

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are fulfilled: (1) The electrical installation in the respective room
corresponds to the specifications stated in this manual and (2) This
equipment is used, operated and maintained according to this manual
and Service Manual.
(7) The manufacturer is not liable for damage caused by unauthorized
tampering with the device(s). Such tampering will forfeit any rights to
claim under warranty.
(8) The equipment may only be used together with accessories supplied
by SHANGHAI HUVITZ’s. If the customer makes use of other
accessories, use them only if there are usability under technical safety
aspects has been proved and confirmed by SHANGHAI HUVITZ or the
manufacturer of the accessory.
(9) Only persons who have undergone proper training and instructions are
authorized to install, use, operate, and maintain this equipment.
(10) User’s manual or service manual should be kept in the place
where the persons in chare of operation and maintenance can access
easily any time.
(11) Do not force cable connections. If a cable does not connect
easily, be sure that the connector (plug) is appropriate for the
receptacle (socket). If you cause any damage to a cable connector(s)
or receptacle(s), let the damage(s) be repaired by an authorized
service technician.
(12) Please do not pull on any cable. Always hold on to the plug when
disconnecting cables.
(13) This equipment may be used for the international application
related to Refractometry according to this manual.

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(14) Before every operation, proceed with visual inspection on the
equipment exterior to seek any mechanical damage(s) to ensure the
proper functioning.
(15) Do not obstruct any ventilation outlet for proper heat dissipation.
(16) In case of any presence of smoke, spark or abnormal noise/smell
from the machine, please power off immediately and pull out the plug.

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IV. Product Outline
1. Nomenclature
[Figure 1. Front]
1. Height Adjustment Mark: Adjusts the eyes’ height of examinees
2. Operation Buttons: Selecting of functions
ٍ3. Operation Lamp : Indicates whether or not the electric power is on
4. Display Monitor: Monitor for measurement
5. Measurement Button: Performing the measurement by pressing it after focusing.
6. Operation Lever: Adjusting the focus by moving to the directions of forward/backward,
left/right, up and down.
7. Print Button : Printing the results of measurement.
8. Printer: Printing the measured results
9. Stage Fixing Lever: Fixing a Upstage of system.

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[Figure 2. Back Section]
1. Forehead Rest: Preventing the vibration by fixing the forehead
2. Measuring Object Lens: Measuring the image imaging on the retina of eyes.
3. Chin Rest: Preventing the vibration by fixing the chin
4. Power Switch: Switch for power on/off
5. Chin-rest Adjusting Lever: Adjusting the up and down position of Chin-rest.

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[Figure 3. Bottom Section]
NOTE
As connecting to exterior monitor, noises can appear on the monitor owing
to the length or kind of cable, and the quality of monitor.
1. Power Supply Socket: A socket connecting to exterior power plug
2. Serial Interface Connector: A terminal connecting to the exterior equipment
3. Clamping Bolt: Fixing the system stage

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2. Optical System
2-1. Overview

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2-2. List of Optical Components
1 : patient’s eye
2-1, -2 : LED for lightening cornea
3-1, -2, -3 : ring unit of the keratometry
4-1 : protective glass
4-2 : half mirror
4-3 : half mirror
4-4 : reflection mirror
5 : objective Lens
6 : diaphragm
7-1 : hole mirror
7-2 : aperture
8 : light source (R)
9-1 : diaphragm
9-2 : refraction prism (R)
10 : relay lens
11 : TV camera (R)
12 : relay lens for keratometry
13 : TV camera (K)
14 : moving lens used to modify the eyesight
15 : internal chart
16 : illumination LED
R = Refractometer
K = Keratometer

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2-3. Light Paths of the System
Ａ: External illumination
(2-1, 2-2 Î 1)
Ｂ: Corneal observation system
(1Î4-1Î4-2Î4-3Î12Î13)
Ｃ: Ker measurement system
(3-1, -2, -3Î1Î4-1Î4-2Î4-3Î12Î13)
Ｄ: Projection system of the REF measurement chart
(8Î7-2Î7-1Î6Î5Î4-2Î4-1Î1)
Ｅ: Projection system of the REF measurement
(1Î4-1Î4-2Î5Î6Î7-1Î9-1Î9-2Î10Î11)
Ｆ: Projection system of the target chart
(16Î15Î14Î4-4Î4-3Î4-2Î4-1Î1)

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3. Electrical System
3-1. Electrical construction diagram
CR-7000 ELECTRICAL SYSTEM BLOCK DIAGRAM
CN1
CN4
CN13
CN14 CN19
CN12 CN11 CN10 CN9 CN8
CN2
CN23
CN18 CN17
CN6
CN16
CON3
CON12
CON10CON8 CON17
CON1 CON13 CON18
CON2 CON14 CON16
CON11
CON7
CON4
CON5
CON6 CON9
AC 100-
240~ Dual
Line
Fuse
Power
switch
(DPST)
SMPS
DC Output
+5V, 4A +5V, 2A
+12V, 1.8A
THERMAL
PRINTER
FRONT
SWITCH
COM1 COM2
RL_PI
JOYSTICK
CMOS
CAMERA
LCD
CCD
CAMERA
CN7
MIRE_RING
REF_MOTOR
REF_PI
REF_LED
MAIN BOARD
BASE INTERFACE BOARD
+5V, 4A +5V, 2A
+12V, 1.8A
+5V, 2A
+12V, 1.8A
+5V, +12V
+5V, +12V+12V
+5V
+12V
+3.3V
+5V
+5V +5V
+12V
CN3
CN15
CON2 ENCODER1
CN5
BACK LIGHT
POWER
[Figure 5.]

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3-2. Power input electrical block diagram
AC 100-
240~ Dual Line
Fuse
Power
switch
(DPST)
SMPS
DC Output
+5V, 4A
+5V, 2A
+12V, 1.8A
[Figure 6.]