: Modern LED illumination is designed to be maintenance-free for its entire service life.
Modern BM 900 units have built-in brightness control, safety cut-offs, and sometimes integrated image capture. The service manual includes:
Replace the legacy transformer with the new constant-current LED driver module to prevent high-frequency flickering during video capture. 5. Troubleshooting Matrix Probable Cause Corrective Action Slit image is tilted or uneven Misaligned slit jaws or damaged ribbon cables
The BM 900 relies on a classical Keplerian optical system combined with a mechanical illumination arm. Understanding its core specifications is vital before attempting any service work:
Occasionally, a clinic closing or a technician retiring sells an unopened, original Haag-Streit manual. These are physically new but may be several years old. Check the copyright date. If the manual predates 2015, it likely misses LED upgrade procedures.