Moller-Wedel Allegra 90
Moller-Wedel · Model Allegra 90
For horizontal movements an X-Y coupling can optionally be mounted to the microscope. This has a range of 60 mm x 60 mm and is controlled via foot switch. By means of a sterilizable knob, the following diaphragm and filters can be selected. Overall illumination of the visual field Mini spot and spot Daylight filter Blue filter Green filter Softlight filter Yellow UV filter Coobservation and documentation Via a beam splitter, MÖLLER ALLEGRA 90 can be equipped with adapters for video, still, and digital cameras, as well as with a stereoscopic observer scope. Furthermore, a 1 CCD video camera can be integrated to reduce the microscope's length.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
Illumination failure or dim light
HighSymptoms: No or dim light, sudden loss during use.
Root cause: Lamp at end of life or a lamp-mount / power-supply fault.
Suspension / swing arm drift
HighSymptoms: Head drifts or will not stay positioned after an accessory change.
Root cause: Swing arm not re-balanced after adding/removing a camera, splitter or observer scope, or worn arm brakes.
X-Y coupling will not run (if fitted)
MediumSymptoms: Foot-switch-controlled 60 x 60 mm X-Y stage does not move or is erratic.
Root cause: X-Y drive motor or foot-switch fault.
Filter / diaphragm selector stuck
LowSymptoms: Sterilizable knob will not select spot / filters cleanly.
Root cause: Worn selector detent.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Illumination lamp
Class Frequent wear itemRel. cost $R&R Fairly easy
Lamp / power supply module
Class Major service partRel. cost $$R&R Moderate
Swing-arm brake / balance assembly
Class Major service partRel. cost $$$R&R Difficult
X-Y coupling drive / foot switch
Class Major service partRel. cost $$$R&R Difficult
Filter / diaphragm selector assembly
Class Major service partRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Illumination lamp | Frequent wear item | $ | Fairly easy |
| Lamp / power supply module | Major service part | $$ | Moderate |
| Swing-arm brake / balance assembly | Major service part | $$$ | Difficult |
| X-Y coupling drive / foot switch | Major service part | $$$ | Difficult |
| Filter / diaphragm selector assembly | Major service part | $$ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: No or dim light
- Unplug before touching the lamp; let it cool.
- Replace the lamp.
- Check the power supply / lamp module output.
- Confirm the lamp mount is seated.
- Verify even, full-brightness illumination.
Symptom: Head will not hold position
- Re-balance the swing arm for the current accessory load.
- Adjust the arm brakes.
- Replace the brake / balance assembly if it will not hold.
- Return the arm to transport position when moving the stand.
- Confirm the head stays put across the working range.