Service manual

Section - V Repair or Replacement BT3000 PLUS Rev. 0, Soft Ver. 8 Page 17 sur 22
5-4.5. REPLACEMENT OF THE WASHING PISTON
Turn off the analyzer prior to replacing the washing
piston. Push the washing piston carriage fully
upward to facilitate the piston removal. Remove all
of the silicone tubes. Gently unscrew the piston
from the plunger stem by turning clockwise
(Fig.22). In case of difficulty (slippery piston, etc.),
use the Piston Grip (Fig. 25) or lint-free cloth to
improve the grip. Fit the new piston and finger-
tighten firmly by turning counterclockwise until it is
properly seated against the thread shoulder.
Reposition the carriage into its original position.
Attach all tubing to the appropriate connectors.
5-4.6. REPLACEMENT OF READING CUVETTE
It may become necessary to remove the cuvette wheel in order to inspect or
replace damaged cuvettes. Generally this operation is necessary when the
following malfunctions occur:
a) Water is present on the cuvette wheel
b) Accidental dropping of foreign matter into the cuvettes
c) Accidental damage of one or more cuvettes
Turn off the analyzer. Push the washing piston carriage fully upward to aid in the
cuvette wheel removal. Unscrew the 6 screws from the cuvette wheel and
carefully lift out. Use a gentle oscillating movement, if necessary, while exercising
extreme care to prevent any damage to the cuvettes. Inspect the cuvette wheel,
rotor, and housing for the presence of any liquid. Clean and dry if necessary.
Afterwards, diagnose the cause of the problem. Avoid removing the cuvette wheel
to wash the cuvettes as this operation will result to be complex because of the use
of only distilled water to avoid calcareous build-up. Perform the washing after the
cuvette drying or substitution by using appropriate analyzer functions. The foreign
objects or physical debris inside the cuvettes can also be removed by turning the
cuvette wheel upside-down.
Another solution for cleaning cuvette (analyzer must be turned on) is to use the
aspiration tube of the washing piston (on top of the washing plunger) by inserting
it all the way into the cuvette for few seconds and then manually rotate the cuvette
wheel to move to the next cuvette for cleaning.
Washer Module
Figure 5-22
WASHING PISTON