Service manual

Section - V Repair or Replacement BT3000 PLUS Rev. 0, Soft Ver. 8 Page 11 sur 22
Unsolder the leads of the defective Peltier, unscrew the 2 screws on the metallic
disc securing the Peltier element and remove it. Substitute the damaged Peltier
with a new Peltier module using thermal grease for dissipation. Make sure to take
into account the proper polarity (see Figure 7-1 in Section VII). An incorrect
assembly may affect the system performance. Carefully tighten the screws
ensuring that these are not over-tightened so as to avoid damage to the ceramic
elements of the Peltier. After assembling all of the devices, it is important to
recalibrate the temperature control.
5-3.2. REPLACEMENT OF THE REAGENT PLATE
TRANSMISSION BELT
For this operation, it is necessary to remove the case, computer box, and the front
cover. Remove the round refrigeration chamber (in aluminum) by unscrewing the
16 mounting screws. Observe the photo sequence for disassembly details.
Loosen the screws of drive motor assembly plate, located on the top left corner,
and slide it slightly inward to loosen the belt. Remove the damaged belt and
replace it with a new belt.
To reassemble, follow the preceding steps in reverse order. Carefully slide the
motor plate outwards to the left to provide the correct tension and tightness to the
belt, and then tighten the mounting screws.
5-3.3. REPLACEMENT OF REAGENT PLATE DRIVE MOTOR
The removal operations are similar to the above "Replacement of the Reagent
Plate Transmission Belt". The motor is secured to the plate through 4 screws.
5-3.4. REPLACEMENT OF THE REAGENT TEMPERATURE AND
HALL SENSORS
The removal operations are similar to the "Replacement of the Reagent Plate
Transmission Belt". Two fixing screws on one side secure the rectangular PVC
housing of Hall sensor. The sensor requires precise positioning to correctly couple
with the magnet on the drive pulley. The Hall sensor assembly must come close
to the transmission belt, which interposes between the magnet and the Hall
sensor at a maximum distance of 1mm almost grazing the same belt.