Roche Diagnostics April 2007
Service manual · Version 2.0 A-23
91xx pH/Electrolyte Analyzers 4 Description of modules
Description of modules
Description of modules
Mechanical assemblies
Front door assembly
For the 9110, 20, 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.
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See the 91xx Spare Parts List for a detailed reference of the parts of this assembly.
Needle unit assembly
To remove the 9110 fill port for replacement or cleaning, grasp the white tab on the
fill port and rotate the bayonet-style connector counter-clockwise. Gently pull the fill
port forward to remove. Replacement can be accomplished in the reverse order.
During removal, be careful not to bend the needle.
The 9110 fill port assembly is desinged for easy removal without the use of tools, for
cleaning, changing tubing or replacement. First, disconnect the sample intake tube on
the left side of the fill port assembly from the sample preheater. Grasp the fill port
assembly and pull it forward carefully. Disconnect the wire from the needle arm. To
reassemble, reconnect the wire, press the fill port assembly into place and reconnect
the tubing.
The 9110 wash port located on the underside of the flap can be removed by appying
pressure to one side to overcome the snap fit. To reinsert, align wash port and apply
pressure to snap into place.
The 9120, 30, 40, 80 and 81 sample needle and fill port are both designed for easy
replacement by the user. To remove the fill port assembly for replacement, pull the fill
After changing any part of the analyzer always perform a calibration of the analyzer as well as a full
QC measurement. QC measurements must be performed in their entirety (i.e., all three QC levels
must be measured). Omitting QC measurements or ignoring QC measurement results may lead to
incorrect patient measurements, which may result in incorrect clinical decisions, possibly
endangering the patient's health.
Due to the update of the 9180 Electrolyte Analyzer according to IVDD compliance a new shielded
front door "FRONT DOOR 9180" is available and compatible with any 9180 Electrolyte Analyzer
(old type SN < 11999 and new type SN > 12001) and with 9120, 30, 40 Electrolyte Analyzers.
Further information: see the 91xx Spare Parts List.
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