VWR International, LLC., Stereo Zoom Microscope
10
C. Mechanical maintenance
1. Adjusting the tension of the focus
Tension comes pre-adjusted by the factory. The best point of tension is that which permits the focus
knobs to move as loosely as possible, without the head sliding down with its own weight.
The tension adjustment collar for focussing is situated between the focussing knob and the head
holder.
a. Loosen the screw located in the collar hole with the 2mm hexagonal key.
b. To increase the tension, turn the collar anti-clockwise; to decrease it, turn the collar clockwise.
c. Re-tighten the hexagonal key.
Troubleshooting
Electrical Problems
PROBLEM
CAUSE
SOLUTION
The bulb does not work.
Outlet inoperative.
Cable not connected.
Bulb burned out.
Fuse blown.
Wrong Bulb.
Have it repaired by a qualified
specialised technician.
Connect the cable to the power
source.
Replace bulb.
Replace fuse.
Replace with appropriate bulb.
Bulb has short life span.
Very high voltage.
Reduce light intensity to the
minimum before turning on or off
the stereomicroscope.
Bulb burns out immediately.
Wrong bulb.
Replace with the appropriate
bulb.
Bulb flickers.
The bulb is not inserted correctly
into socket.
Bulb on the point of burning out.
Fuse cover badly closed.
Bad connection with power
source.
Insert bulb correctly.
Replace bulb.
Close correctly.
Have repaired by a qualified
specialised technician.
Fuse blown quickly
Wrong fuse.
Replace with appropriate fuse.
Fuse blown instantly
Short circuit.
Have repaired by a qualified
specialised technician.