Roche Diagnostics April 2007
A-24 Service manual · Version 2.0
4 Description of modules 91xx pH/Electrolyte Analyzers
Description of modules
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 9120, 30, 40, 80 and 81 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.
Two (9110) or three screws (9120, 30, 40, 80, 81) 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 a Philips
screwdriver (9110) or an Allen wrench (9120, 30, 40, 80, 81). Then, remove the front
securing screw (n./a. on the 9110), 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.
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See the 91xx Spare Parts List for a detailed reference of the parts of the needle unit.
Electrode holder assembly
To remove the electrode holder assembly from the analyzer, first unplug the sample
intake tubing on the right side of the module, then the preheater cable (9110 only) or
the sample sensor cable (9120, 30, 40, 80 and 81), then remove the reference solution
tubing connector and last, take out the waste tube (green tag) at the left side of the
electrode holder. The electrode holder can now be removed by pressing the two
plastic tabs (right and left side of the module) and sliding the module forward. Press
the plastic tabs again to release the second detent and completely remove the module
from the analyzer. The sample preheater or the sample sensor and/or the left side
electrode holder can be removed and replaced by removing the screws on the under
side of this module.
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See the 91xx Spare Parts List for a detailed reference of the parts of this assembly.
Peristaltic pump assembly
Replacement of the roller assembly of the peristaltic pump can be accomplished by
removing the pump tubing and firmly pulling the roller assembly toward the front. To
replace the roller assembly, align the roller and the flat on the motor shaft and press
the replacement roller into position.
To remove the motor, first remove the rear panel assembly and SBC Board.
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For details, see Rear panel assembly on page A-25, SBC board on page A-26.
Now, the electrical connector on the lamp board can be accessed to unplug the motor
connector. The motor can now be removed by removing four screws located on the
front of the housing near the peristaltic pump.
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