Components
Components
Components
Components
Components
4
Lamp Housing
Lamp Focus
Knob
Eyepieces
with
Eyecups
Trinocular Port
Dust Cap
Trinocular Port
Diaphragm
Centering
Adjustment
(left)
Head Set
Screw
Prism Selector
Knob
Illumination
Selector Knob
Diopter
Adjustment
Objective
Turret
Mechanical
Stage
Substage
Control
Fine Focus
Control
Coarse
Focus
Control
Focus
Tension
Control
Power
Switch
Illumination
Selector Switch
Base
Transmitted Illumination
Aperture Diaphragm
Glass Stage Insert
Transmitted Illumination
Field Diaphragm
T
T
T
T
Troubleshooting
roubleshooting
roubleshooting
roubleshooting
roubleshooting
25
For information about parts, accessories, or service -- contact your dealer directly
or contact VanGuard Microscopes at 1-800-423-8842.
Symptom:
Can’t focus on specimen image
Step #
Possible Cause
How To Test
Test Result?
Solution
For More Info
2
1
Dirty objective
Visually inspect
Objective is clean
Objective is not clean
Go to next step
Clean objective or replace with new objective
Page 23
Stage limit set too low
Check position of stage limit by
loosening the control and adjusting
the focus
Stage limit set correctly
Set too low
Contact dealer or VanGuard Microscopes
Raise stage and set stage limit
Page 15
Symptom:
The stage keeps drifting downward
Step #
Possible Cause
How To Test
Test Result?
Solution
For More Info
1
Focus tension is set too loose
Check focus tension control
Tension too loose
Tension set correctly
Increase tension
Contact dealer or VanGuard Microscopes
Page 15
Stand
Symptom:
Image through eyepieces is too dim
Step #
Possible Cause
How To Test
Test Result?
Solution
For More Info
1
2
Variable lighting control (VLC) is
turned down too far
Visually inspect
VLC is turned up
VLC is turned down
Go to next step
Turn VLC up
Page 12, 16
Lamp not centered properly
Visually inspect
Lamp is centered
Lamp is not centered
Go to next step
Center the lamp
Page 13, 17
3
Dirty condenser, eyepiece, or
objective lenses
Visually inspect
Lenses are dirty
Lenses are clean
Clean condenser, eyepiece, or objective lenses
Contact dealer or VanGuard Microscopes
Page 23
Symptom:
No image visable in eyepiece and/or trinocular port
Step #
Possible Cause
How To Test
Test Result?
Solution
For More Info
1
6
4
3
2
Light is not switched on
Visually inspect
Switched on
Not switched on
Go to next step
Move power switch to on position
Page 12, 16
Variable lighting control (VLC) is set
too low
Visually inspect
Not set too low
Set too low
Go to next step
Increase VLC level
Objectives not installed or turret is
set to empty position
Visually inspect
Objectives are installed
Objectives not installed
Go to next step
Install objectives or change turret position
Page 10
Prism selector knob in wrong
position
Visually inspect
In correct position
Not in correct position
Go to next step
Set to correct position
Page 11
Light path blocked (transmitted
illumination)
Visually inspect space between
illuminator and objectives
Blockage present
Nothing blocking
Remove blockage
Contact dealer or VanGuard Microscopes
Page 18
Page 12, 16
5
Illumination selector switch and/or
knob are set at incorrect positions
Visually inspect
In correct position
Not in correct position
Go to next step
Set to correct position
Page 12, 16
