Zeiss Humphrey Field Analyzer HFA 750-I

Remove the Projection Interconnect PCB (3.18)

Loosen the four M3 screws securing the carriage motor to the projection assembly

Remove the projection assembly, using all necessary precautions (3.17)

Cut any cable ties securing the carriage motor cable

Remove the four loosened M3 screws holding the motor in place, and remove the motor

Loosen the two M3 setscrews on the carriage motor pulley, and remove the pulley from the shaft

Install replacement cable tie(s) for the motor cable before reinstalling the projection assembly in the instrument

Insert a 1/4"-wide screwdriver blade into the two small slots in the spring-loaded tab at the upper end of the anchor.

Push in on the tab with the screwdriver and turn it 1/8 turn counterclockwise, to latch the tab in its install/remove position.

Remove the screwdriver and push the anchor out towards the front.

Ensure the spring-loaded tab inside the anchor is latched in its install/remove position (1/8 turn counterclockwise).

Insert the anchor into its hole in the assembly.

Insert a 1/4"-wide screwdriver blade into the two small slots in the spring-loaded tab.

Push in on the tab with the screwdriver and turn it 1/8 turn clockwise to its anchored position.

Loosen the four M3 screws securing the carriage motor to the projection assembly.

Remove the two small M3 screws securing the belt plate against the belt.

Adjust the belt tension (Section 4).

See Table 3-1 for follow-up checks and adjustments.

Pull the headrest drive belt to move the chinrest horizontal lead screw nut up against its limit nearest to the X-motor

Remove the four screws securing the chinrest assembly to the front cover assembly (FIGURE 3.10)

Lift the chinrest assembly away from the front cover assembly and remove the belt from the X-motor pulley

Maneuver the belt downward between the headrest pulley and the front cover assembly until the belt is free

Remove the four M4 screws securing the chinrest assembly to the front cover assembly (FIGURE 3.10)

Turn off the HFA II-i and lower the table

Remove the top access panel by rotating it counterclockwise until the lamp symbol aligns with the raised dot

Locate the projection lamp inside the open case top at the 12 o’clock position

Allow the lamp to cool completely (approximately five minutes) before handling it

Ensure not to touch the two disk-shaped filters

Remove the connector cable by pulling its connector straight upward