14
The eyepieces and objectives on VanGuard Microscopes are coated. They should
never be wiped while dry as any dirt or dust will scratch the coating. The surfaces
should either be blown off with an air canister, or blown and cleaned with an air-bulb and
camel-hair brush. It is recommended to then use a lens cleaner. Apply with a cotton
swab for a minimum of wetting, then wipe the surface clean with a quality lens tissue.
Xylene, since it breaks down the bonding material holding the lenses, should never be
used as a cleaner. Periodically your VanGuard Microscope should be fully serviced by
a qualified service technician.
Maintenance
If the microscope is plugged in but the lamp is not turning on, the fuses could be blown.
To check the fuses, UNPLUG THE MICROSCOPE FROM YOUR POWER SOURCE
and remove the 5 screws securing the back panel (see figure 17).
Once the screws are removed, carefully pull the rear cover away from the microscope.
There is a small circuit board connected to the rear cover that houses the two fuses (see
figure 18 - note: connecting wires removed for clarity). Avoid pulling on the rear cover
hard enough to loosen any of the wires that connect the circuit board to the microscope.
To replace the blown fuse(s) (the wire inside is broken, or the glass is blackened) pull
the fuse out of it’s holder and snap a new fuse in. You might need to use a screwdriver
to lever the fuse out, but be careful not to scratch the circuit board.
Replace the rear cover and the five screws.
Replacing the Fuse
1
2
3
4
Before attempting to replace or remove the lamp, UNPLUG THE MICROSCOPE FROM
ANY POWER SOURCE AND ALLOW SUFFICIENT TIME FOR THE LAMP TO COOL.
Lamp replacement is done by laying the microscope on its back and opening the trap
door located on the bottom of the base by pulling on the release knob (see figure 15).
Note: Be careful not to touch the glass lamp when replacing -- use a tissue or
other medium to grasp the lamp. This will prevent the oils from your hand from
reducing lamp life. If contact is made with the lamp, clean lamp with rubbing
alcohol and allow a brief drying period.
Once the door is open, the lamp can easily be removed simply by grasping the lamp
and pulling it from the fixture (see figure 16).
When replacing, insert the new lamp into the same fixture. Make sure that the pins on
the lamp slide easily into the slots. You should not have to force the lamp.
Replacing the Lamp
1
2
3
4
Figure 17
Figure 18
Figure 16
Figure 15
Maintenance
Replacement Lamp
-- 20W Halogen (Part No. 1400-20WHL)
Replacement Fuse
-- 0.25A, 250V (Part No. 1400-FS1) [2 required]
All Models
All Models
All Models
For information about parts, accessories, or service -- contact your dealer directly or contact
VanGuard Microscopes at 1-800-423-8842.
