Zeiss Humphrey Field Analyzer HFA 720-I

Carefully note cable routing and taping before removal

Ensure all necessary tools are available

Remove the following cables as an assembly

Inspect turret for any signs of binding or noise

Record any issues found during inspection

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.

Remove the projection assembly and install it on the projection mount tool (3.17)

Is the projection mount tool set up to match the diameter of the carriage rails (3/8")?

Carefully slide the X-axis turret motor belt off the large gear at the top of the turret

Locate the hole in the casting from the top side of the assembly

Remove the three screws holding the turret in place through the hole (FIGURE 3.8)

Ensure the loosened X-axis edge detector flag does not hit the edge detector and block turret rotation

Carefully pull the turret out of its top bearing

Lower the power table to its lowest position and lock the table top in its center position.

Remove the front cover assembly (3.2).

Remove the rear cover assembly (3.3).

Ensure that the power cord is disconnected.

Disconnect the two large connectors from the power supply.

Remove the front and rear covers (3.2, 3.3)

Disconnect the two large ribbon cable connectors from the Projection Interconnect PCB

Remove the two socket head M3 screws holding the carriage assembly to the carriage rail block (FIGURE 3.7)

Carefully remove the carriage and place it on a padded work surface

Note the relative positions of washers for reinstallation

Remove the retaining ring (E-clip) securing the shaft of the color wheel to the carriage