Meiji Techno MT-50 Series User manual

Version No.: V1.2
07 Series
Biological
Microscope
Manual
This manual expatiates the using method, troubleshooting and maintenance
about MT-50 series biological microscope. Please study this manual thoroughly
before operating, and keep it with the instrument. The manufacturer reserves the
rights to the modifications by technology development. On the basis of operation
ensured, technical specifications may be subject to changes without notice.

Contents MT-50 Series
Before Use
1. Components ....................................................................................................................................... 1
2. Assembling ........................................................................................................................................ 5
2-1 Assembling Scheme ..................................................................................................................... 5
2-2 Assembling Steps ......................................................................................................................... 7
3. Operation........................................................................................................................................... 9
3-1 Set Illumination ........................................................................................................................... 9
3-2 Place the Specimen Slide ............................................................................................................. 9
3-3 Adjust the Focus .......................................................................................................................... 9
3-4 Adjust the Focusing Tension ...................................................................................................... 10
3-5 Adjust the Diopter ..................................................................................................................... 10
3-6 Adjust the Interpupillary Distance ............................................................................................ 10
3-7 Center the Condenser ................................................................................................................ 11
3-8 Adjust the Field Diaphragm ...................................................................................................... 11
3-9 Adjust the Aperture Diaphragm ................................................................................................ 12
3-10 Use the Oil Objective (100X) .................................................................................................. 12
3-11 Use the Filter ........................................................................................................................... 13
3-12 Replace the Fuse ..................................................................................................................... 13
3-13 Assemble and Use of the TV Device ........................................................................................ 13
3-14 Assemble the Photography Device .......................................................................................... 14
4. Assembling and Operation of Accessories ..................................................................................... 15
4-1 Assembling and Operation of Phase Contrast Flapper ............................................................. 15
4-2 Assembling and Operation of Disc Phase Contrast Condenser ................................................ 15
4-3 Assembling and Operation of Dark Field Flapper .................................................................... 16
4-4 Assembling and Operation of Simple Polarizing ...................................................................... 17
4-5 Operation of Digital Observation Head .................................................................................... 17
4-6 Assembling and Operation of the LED Fluorescence attachment ............................................. 17
5. Troubleshooting ............................................................................................................................ 200

Before Use MT-50 Series
1. Operation Notice
1. As the microscope is a high precision
instrument, always operate it with care, and
avoid physical shake during the operation.
2. Do not expose the microscope in the sun
directly, either not in the high temperature, damp,
dust or acute shake. Make sure the worktable is
flat and horizontal.
3. When moving the microscope, use both hands
to hold its back hand-clasping ① and the front
base ②, and lay it down carefully (see Fig. 1).
★ It will damage the microscope by holding
the stage, focusing knob or head when
moving.
4. When working, the surface of condenser will
be very hot. Make sure there is enough room for
the heat dissipating around the condenser③ (see
Fig. 2).
5. Connect the microscope to the ground to avoid
lightning strike.
6. For safety, make sure the power switch ④ is
at “0” (off) and power it off before replacing the
bulb or fuse, and wait until the lamp cools down
(see Fig. 3).
★ Bulb selected only: 3.3V 3W LED （class
3B）light 6V 30W HAL.
7. Wide voltage range is supported as 100~240V.
Additional transformer is not necessary. Make
sure the voltage is in this range.
8. Use the special wire supplied by our company.
9. All power OFF devices have not been set in the
position where is difficult to operate.
Fig. 1
Fig. 2
Fig. 3

MT-50 Series
2. Maintenance
1. Wipe the lens gently with a soft tissue. Carefully wipe off the oil marks and fingerprints
on the lens surfaces with a tissue moistened with a small amount of 3:7 mixture of alcohol and
ether or dimethylbenzene.
★ As the alcohol and ether is flammable, don‟t place these chemical near to fire or fire
source. For example, when turning on or turning off the electrical device, please use these
chemical in a ventilated place.
2. Don’t use organic solution to wipe the surfaces of the other components. Please use the
neutral detergent if necessary.
3. If the microscope is damped by liquid when using, please power it off immediately and
wipe it dry.
4. Never disassemble the microscope, otherwise the performance will be affected or the
instrument will be damaged.
5. After using, cover the microscope with a dust cover.
3. Safety Sign
Sign
Signification
Study the instructions before use. Unsuitable operation would lead to
person hurt or instrument faulty.
|
Main switch ON
O
Main switch OFF

-1-
1. Components MT-50 Series
Objective
Nosepiece
Arm
Tension
Adjustment
Ring
Coarse
Focusing
Knob
Fine Focusing
Knob
Light Adjustment
Knob
Koehler Illuminator
Condenser
Binocular Head
Eyepiece
Objective
Stage
Koehler Illuminator
Condenser
Focus Arm

-2-
MT-50 Series
Eyepiece
Objective
Stage
Koehler Illuminator
Condenser
Light Source
Coarse Focusing
Knob
Power Switch
Fine Focusing
Knob
Focus Arm
Arm
Lock-screw
Trinocular head
Objective
Nosepiece
Koehler Illuminator
Condenser

-3-
MT-50 Series
LED Fluorescence Microscope
Eyepiece
Trinocular Head
LED Fluorescence
Illuminator
Filter Block
Adjustment knob
Light Shield
Objective
Stage
Koehler Illuminator
Condenser
Koehler Illuminator
Condenser
Light Source
Power Switch
Coarse Focusing
Knob
Objective Nosepiece
Arm
Focus Arm
Fine Focusing
Knob
Fluorescence
Light Adjustment
Knob
Lock-screw
LED Fluorescence
indicator

-4-
MT-50 Series
Binocular Head
LED Fluorescence Illuminator
Eyepiece
Objective
Nosepiece
Arm
Stage
Fine Focusing
Knob
Coarse Focusing
Knob
Light Adjustment
Knob
Focus Arm
组
Light Shield
Objective
Koehler Illuminator
Condenser
Koehler Illuminator
Condenser
LED Fluorescence
indicator

-5-
2. Assembling MT-50 Series
2-1 Assembling Scheme
Following is the Assembling Scheme, and the numbers denote the assembling order.
★Before assembling, make sure there is no dust or dirt. Assemble carefully and do not
scrap any part or touch the glass surface.
Eyepiece
Objective
Condenser
Light Source
Power Cord

-6-
MT-50 Series
LED Fluorescence Microscope
Light Source
Power Cord
LED Fluorescence Illuminator
Binocular Head
Eyepiece
Light Shield
Objective
Condenser
Transformer

-7-
MT-50 Series
2-2 Assembling Steps
2-2-1 Assemble the Condenser
Assemble Koehler Illuminator Condenser
1. Rotate the coarse focusing knob① to raise the
stage to the highest position (see Fig. 4).
2. Rotate the condenser up-down knob ② to
lower the bracket of condenser to the suitable
position.
3. Fully loosen the condenser lock-screw③.
4. Insert the condenser into the hole of stand
according to the arrowhead, until the condenser is
equal with the stand, and then rotate the
condenser to make the handle frontward.
5. Tighten the lock-screw③ of condenser, then
raise the condenser with the up-down knob to the
highest position.
2-2-2 Assemble the Objective
1. Rotate the coarse focusing knob① to lower the
stage to a suitable position (see Fig. 5).
2. Install the objectives ② into the objective
nosepiece③ from the lowest magnification to the
highest in a clockwise direction from the rear.
★ When operating, first use the low
magnification objective (4X or 10X) to search
for specimen and focus, and then replace with
high magnification objective to observe.
★ When replacing the objective, rotate the
objective nosepiece until it sounds “ka-da”, to
make sure the objective wanted is in the center
of optical path.
2-2-3 Assemble the Eyepiece
1. Take down the cover of eyepiece tube①.
2. Insert the eyepiece② into the eyepiece tube,
until it touches the surface (see Fig. 6).
3. When adjusting diopter by adjustable eyepiece,
lock eyepiece with hexagon lock-screw ③ to
avoid the eyepiece group② rotating in eyepiece
tube, as the figure shows.
Fig. 6
Fig. 5
Fig. 4
图3
图14
图13
图4
图5
图4
图4

-8-
MT-50 Series
2-2-4 Assemble light source
1. Align the oriented pin① and power pin② on
the light source to oriented holder③ and power
socket④, and then push light source into arm
smoothly and plug it thoroughly (see Fig. 7).
★ Whenever replacing the bulb, turn off the
main power and wait until the bulb and holder
cool down.
★ LED illumination, replace whole LED light
source if LED bulb is burnt out. The
assembling for halogen bulb light source is as
same as LED light source‟s.
2-2-5 Connect the Power Cord
★ Don‟t use strong force when the power cord
is bended or twisted, otherwise it will be
damaged.
1. Make sure the power switch is at“0”(OFF)
before connecting.
2. Insert the connector① of power cord into the
power socket②, and make sure it connects well
(see Fig. 8).
3. Insert the other connector into the socket of
power supply, and make sure it connects well.
★ Use the special wire supplied by our
company. If it‟s lost or damaged, choose one
with the same specifications.
★ Wide voltage range is supported as
100~240V.
★ Connect the power cord appropriately to
make sure the instrument is connected to
ground.
Fig. 7
Fig. 8

-9-
3. Operation MT-50 Series
3-1 Set Illumination
1. Put through the power and turn on the main
power switch to“—”.
2. Adjust the light adjustment knob① until the
illumination is comfortable for observation.
Rotate the light adjustment knob clockwise to
raise the voltage and brightness. Rotate the light
adjustment knob counterclockwise to lower the
voltage and brightness (see Fig. 9).
★ Use of bulbs in the low-voltage state can
extend the bulb life.
3-2 Place the Specimen Slide
1. Push the wrench① of the specimen holder
backwards.
2. Loosen the wrench①, and clamp the slide②
by the clips while the cover glass faces up (see
Fig. 10).
3. Rotate the X and Y-axis knob③. Move the
specimen to the center (alignment with the center
of the objective).
3-3 Adjust the Focus
1. Move the objective 4X to the optical path.
2. Rotate the position screw② to top, observe the
right eyepiece with right eye. Rotate the coarse
focusing knob① until the image appears (see Fig.
11).
3. Rotate the fine focusing knob ③ for clear
details and lock the position screw②.
★ The position screw can stop the objective
touching the clips.
Fig. 9
Fig. 10
Fig. 11

-10-
MT-50 Series
3-4 Adjust the Focusing Tension
If the handle is very heavy when focusing or the
specimen leaves the focus plane after focusing or
the stage declines itself, please adjust the tension
adjustment ring① (see Fig. 12).
To tighten the focusing arm, rotate the tension
adjustment ring① according to the arrowhead
pointed; to loosen it in the reverse direction.
3-5 Adjust the Diopter
Align the scale “0” of diopter adjustment ring①
with the scale②, and then focus to get a clear
image. Then observe through the other eyepiece,
rotate the diopter adjustment ring until it is clear.
(see Fig.13).
★ There is ±5 diopter on the ring. To align
with the scale value is your eye‟s diopter.
★Remember your eye‟s diopter, so that you
could use next time.
3-6 Adjust the Interpupillary Distance
When observe with two eyes, hold the base of the
prism and rotate them around the axis until there
is only one field of view.
“。”① on the eyepiece base points to the scale②
of interpupillary indication, which means the
value of interpupillary distance (see Fig. 14).
Range：50～75mm.
★Remember your interpupillary distance for
further operation.
★ This Gemel eyepiece tube can be rotated
360º. User can select corresponding eyepoint
height according to his own height. Like the
interpupillary distance is 65mm, rotate front
part of eyepiece tube 180° can increase
eyepoint 34mm (see Fig. 15).
Fig. 12
Fig. 13
Fig. 14
Fig. 15

-11-
MT-50 Series
3-7 Center the Condenser
1. Rotate the condenser up-down knob① to raise
it to the highest position (see Fig. 16).
2. Rotate the objective 10X to the light path and
focus the specimen.
3. Rotate the field diaphragm adjustment ring②
to put the field diaphragm to the smallest position.
4. Rotate the condenser up-down knob①, and
adjust the image to be clearest.
5. Adjust the center adjustment screw ③ and
put the image to the center of the field of view
(see Fig.17).
6. Open the field diaphragm gradually. If the
image is in the center all the time and inscribed to
the field of view, it shows condenser has been
centered correctly.
7. In fact, you can enlarge the field diaphragm a
bit and make the image circumscribed to the field
of view.
3-8 Adjust the Field Diaphragm
By limiting the diameter of the beam entering the
condenser, the field diaphragm can prevent other
light and strengthen the image contrast. When the
image is just on the edge of the field of view, the
objective can show the best performance and
obtain the clearest image.
Fig. 16
Fig. 17

-12-
MT-50 Series
3-9 Adjust the Aperture Diaphragm
1. The aperture diaphragm decides the numerical
aperture of the illumination. Only when the N.A.
of illumination is matching with the N.A. of the
objective, it can obtain better resolution and
contrast, and also increase the depth of field.
2. As the contrast is usually low, rotate the
diaphragm adjust ring③ to make the arrowhead
pointed to the related magnification position on
condenser base④, namely, to adjust the N.A. of
illumination to 70%-80% of the N.A. of objective.
The eyepiece can be taken off when it’s necessary
to observe from the tube.
Adjust the ring③ until see the figure as shown in
Fig. 18, to adjust the proportion (see Fig. 18&19,
① is the image of aperture diaphragm, ② is the
edge of objective).
3-10 Use the Oil Objective (100X)
1. Use objective 4X to focus the specimen.
2. Place a drop of oil① on the specimen (see Fig.
20).
3. Rotate the nosepiece counterclockwise and
rotate the oil objective (100X) to the light path.
Then use the fine focusing knob to focus.
★ Make sure there is no air bubble in the oil
for fear affect the image.
A. Move the eyepiece to examine the air bubble.
Open the aperture diaphragm and field diaphragm
fully and observe the edge of the objective from
the tube (It seems round and light).
B. Rotate nosepiece slightly and swing the oil
objective for some times to remove the air bubble.
4. After using, wipe the front lens with a tissue
moistened with a small amount of 3:7 mixture of
alcohol and ether or with dimethylbenzene. Wipe
oil on the specimen.
★ Don‟t put another objective to the light path
before the oil is wiped to avoid wetting the dry
objective.
★ Too much dimethylbenzene would dissolve
the lens‟s stickiness.
Fig. 19
Fig. 20
Fig. 18

-13-
MT-50 Series
3-11 Use the Filter
Filter can make the background more suitable
and increase the contrast (see Fig. 21).
★ There are three kinds of filter: blue, green
and yellow.
★ Place the filter‟s rough side downward.
3-12 Replace the Fuse
Turn the main switch to “0” (OFF) before
replacing the fuse. Pull out the power cord. Then
screw off the fuse group① from the fuse base②
with a “-” type screwdriver. Install a new fuse
and screw it on the fuse base (see Fig. 22).
★ Specification of the fuse: T250V, 3.15A.
3-13 Assemble and Use of the TV Device
1. Loosen the lock-screw① on the trinocular
head and get down the dust-cover ② of the
trinocular (see Fig.23).
2. Get down the dust-cover caps of the TV
adapter ③. Insert the ③ into the trinocular
according to the direction of the figure. Screw on
the lock-screw① tightly.
3. Loosen the lock-screw④. Get down the C
mount⑤ from③. Screw onto CCD and then
install the orifice to ③. Screw on the lock-screw
④ tightly.
4. Observe through binocular till image clear, then
observe through CCD, if the image is unclear,
rotate the adjustment tube③ until it is clear.
Fig. 23
Fig. 22
Fig. 21

-14-
MT-50 Series
3-14 Assemble the Photography Device
1．Loosen the lock-screw ① on the trinocular
head and get down the dust-cover ② of the
trinocular.
2．Insert photography device to the trinocular.
Screw on the lock-screw① (see Fig.24).
3．Loosen the lock-screw ③ on the photo tube
and get down the photo tube ④ (see Fig.25).
4．Insert the photography eyepiece 3.2X⑤ to the
eyepiece base ⑥. Insert ④ and screw on the ③
tightly.
5．After observing clearly for binocular. Then
operate it according to the introduction of the
photography device.
Fig. 25
Fig. 24

-15-
4. Assembling and Operation of Accessories MT-50 Series
4-1 Assembling and Operation of Phase
Contrast Flapper
1. Keep the phase contrast flapper① face up
(upward the face with word), insert it from left to
right into the condenser flapper socket as the
direction of the arrow pointed (see Fig. 26).
2. Every diaphragm or hole has its corresponding
position, one diaphragm or hole is inserted into
the center of optical path when it sounds “ka-da”
during phase contrast flapper rotating.
3. When observing phase contrast, keep the
adjusting ring of the aperture diaphragm ②
indicator to “PH” position.
★ Each magnification phase contrast objective
is used with matched ring diaphragm (Like
10X phase contrast objective corresponding to
10X ring diaphragm).
★ As the ring diaphragm is pre-centered, it
doesn‟t need to be adjusted in operation in
normal cases.
4-2 Assembling and Operation of Disc Phase
Contrast Condenser
1. Assembling of Condenser please refer to 2-2-1,
change the objective on the nosepiece to phase
contrast objective. Center the phase contrast
condenser before use.
2. Rotate the phase contrast ring② to “BF”
position in bright field observation. When it
sounds “ka-da” in rotating, it indicates that one
diaphragm or hole is rotated into the center of
optical path (see Fig. 27).
Fig. 27
Fig. 26

-16-
MT-50 Series
4-2-1 Centering Halo
In phase contrast microscopy observation, slide
the aperture diaphragm lever① to the most left as
the direction of the arrow pointed (always keep
aperture diaphragm at maximum). (see Fig. 27)
1. Put speciman on the stage and focus.
2. Take out one observation eyepiece and insert
one CT (certering telescope) into the tube
3. Confirm the corressponding phase ring (in
phase contrast objective) and halo (in phase
contrast disc②) are moved into optical path.
4. Adjust certering telescope to get a clear image
of phase ring and halo in field of view (see Fig.
28).
5. Center by phase contrast adjusing lever③ until
halo④ center overlap the phase ring center (see
Fig. 27, Fig. 28).
6. Adjust phase ring and halo of other
magnification phase contrast objective according
to above steps.
★ It can not get the phase contrast microscopy
observation effect if the halo is not centered
correctly.
4-3 Assembling and Operation of Dark Field
Flapper
1. Keep phase contrast flapper face up (upward
the face with word), insert it from left to right into
condenser flapper socket as the direction of the
arrow pointed (see Fig. 29).
2. Every diaphragm or hole has corresponding
position, when it sounds “ka-da” in dark field
flapper rotating, it indicates that one diaphragm or
hole is inserted into the center of optical path.
3. In dark field observation, adjust aperture
diaphragm adjusting ring to maximum position.
★ Dark field ring diaphragm is on the left side
of flapper.
Fig. 28
Fig. 29