Huvitz CRK-7000 User manual

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Service Manual
Auto Ref/Keratometer CRK-7000

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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