Haag-Streit BM 900 slit lamp's primary service and operational documentation is the Instructions for Use (IFU) , with the latest 19th Edition (2023-01) serving as the current standard. Haag-Streit

Appendix D: 3D-printable joystick boot and knob cap

Older manuals may not cover the integrated digital imaging components often found on modern BM 900 setups. The latest documentation includes troubleshooting for the camera triggers and beam splitters used in digital photography.

Main Spring: Replacement involves collapsing helper springs with a screwdriver before removing the carrier to prevent sudden spring release. 3. Electrical and Illumination

From the manual:

Expanded Field of View: The new LED modules automatically extend the slit height from 8mm to 14mm, supporting advanced procedures like those required for laser surgery.