4 Units Description 
4-20
The steps are shown as follows. 
  1. Remove the up cover assembly which is fixed to compartment by loosening four         
M4x10 hexagon socket head screws. 
  2. Remove the disk assembly which is fixed to drive shaft assembly by loosening three 
M3x12 hexagon socket head screws. 
3. Remove the photometric unit which is fixed to compartment assembly by loosening 
three M4x16 hexagon socket head screws. 
4. Remove the compartment assembly which is fixed to compartment support pole by 
loosening four M5x20 hexagon socket head screws. 
5. Remove the coder sensor assembly which is fixed to base board by loosening three 
M3x6 hexagon socket head screws. 
6. Remove the motor assembly which is fixed to motor support pole by loosening four 
M4x12 hexagon socket head screws. 
Precautions: 
1. Correct direction of plug is required while installing the motor assembly. 
2. Proper tensile force is required while installing the synchronous belt. 
4.4.3.1  Motor Assembly 
The  structure  and  the  steps  of  dismounting  motor  assembly  are  similar  to  the 
sample/reagent disk. Please refer to the relative content of Motor Assembly 
described
 
in chapter 4.3.3.2. 
4.4.3.2  Coder Sensor Assembly 
The steps of dismounting coder sensor assembly are similar to the sample/reagent disk. 
Please refer to the relative content of Sensor Assembly 
described
 in chapter 4.3.3.2. 
CAUTION        
 
Do not remove the sensor assembly because the position change 
of sensor may cause the photometric measuring position change. 
If  the  position  of  sensor  assembly  is  changed,  the  position  of 
photometric measurement needs to be re-adjusted. For details on 
adjusting, please refer to 4.6.4.1.