48
4
Description of Modules
4.1
Mechanical Assemblies
4.1.1 Front Door Assembly
For the 9120, 30, 40 and 80 analyzers, the front door can be removed by moving
the analyzer to the edge of a work surface so the analyzer door, when opened, will
extend past the edge of the work surface. With one hand, hold the analyzer door
near the right side hinge pin and, with the other hand, gently apply pressure to the
middle rear area of the door. This will allow the right hinge pin to clear the retaining
hole in the main chassis. The door can then be removed from the analyzer.
The 9181 front panel can be removed by tilting it slightly away from the analyzer
and lifting it straight up. The plastic window can also be replaced in the field by
gently pressing from the rear of the window and snapping the plastic window out
toward the front of the analyzer door. The door magnets cannot be replaced in the
field as they are glued in place with conductive adhesive.
4.1.2 Needle Unit Assembly
Both sample needle and fill port are designed for easy replacement by the user.
To remove the fill port assembly for replacement, pull the fill port holder towards
the front for easy access. Then, press the two plastic tabs on the fill port to allow
removal of the fill port from the fill port holder. The sample needle can also be
removed and is supplied as a one-piece assembly including the intake tubing.
To remove the sample needle, grasp the needle near the white holder block and pull
up to unsnap the sample needle from its position. To replace the assembly, align a
replacement sample needle and press the replacement assembly into place.
Three screws located on the left side of the assembly hold the needle unit assembly
in place. To access the two rear screws, turn power off and remove the rear panel.
The rear panel can be moved away from the unit for easier access by unplugging the
wire harness from the power supply. The SBC board can now be removed by
removing the screws which secure the SBC board and disconnecting the cables on
the SBC board. Disconnect the connector to the lamp board which supplies the
Door Open signal. The two rear screws which secure the needle unit can now be
removed using an Allen wrench. Then, remove the front securing screw, the sample
intake tubing and the reagent supply tubing (red tag) from the fill port. The needle
unit can now be removed from the front of the analyzer for replacement. Reference
the Illustrated Parts diagram in Section 8 for a detailed parts diagram of the needle
unit.