CHAPTER 3 MAINTENANCE PROCEDURESPioneer Balances Service Manual 3-21 Ohaus Corporation www.ohaus.com3.3.14 Reinstalling Internal Calibration ComponentsWhen reinstalling the Internal Calibration Components, follow these steps:1. Insert the InCal Motor’s Cam in the hole of the InCal Motor Assembly (see Figure3-51), insert the four screws that hold the motor to the frame and tighten them.2. Mount the InCal Motor Assembly in the Bottom Housing. (See Figure 3-50.)3. Before inserting the screws, carefully place the motor’s ribbon cable in the groove inthe Housing, and thread it beside the RS232 cable along the outside of the Housing.Insert its plug in the PCB.4. Insert and tighten the screws that hold the assembly to the Housing.5. Position the Weight Lifter as in Figure 3-50, insert and tighten the screws holding it tothe Housing.6. Install the Load Cell in the Housing, carefully place the InCal Weights in the WeightHolders, position the Weight covers above them, insert and tighten the screws.7. Test the InCal mechanism: see Appendix C, Section C.5.1, Incal Weight MechanismTesting.3.3.15 Load Cell Removal/Installation – Analytical Balances8. Disassemble the Housing and openthe balance. (See Section 3.2.1.)9. Carefully unplug the cable thatconnects the Main PCB to thePosition Sensor Board. (SeeFigure 3-53.)9. Remove the three screws holdingthe Load Cell in place – in themiddle of the Bottom Housing.(See Figure 3-54.)Figure 3-53. Cable connects tothe Position Sensor Board.10. Carefully lift the Load Cell out of thebase.11. To re-install the Load Cell, followSteps 1 through 4 in reverse.It is now possible to disassemble the Load Cellfor cleaning, alignment, or replacing parts.Figure 3-54. On Analytical balances, the 3screws securing Load Cell are on bottom.
