Internal Calibration Testing; Incal Motor Removal & Replacement - OHAUS PA64 Service Manual

CHAPTER 3 MAINTENANCE PROCEDURES

3.3.22 Internal Calibration Testing

This section describes how to test the internal calibration in a Block Style Load Cell. There can
be several reasons that internal calibration does not function, including a broken or jammed
InCal Mechanism, a defective InCal Motor, or a defective Main PC Board. To test the internal
calibration, proceed as follows:
1. Connect an RS232 cable and a computer to the balance.
2. Follow instructions in Appendix C, Section C.5.1, Incal Weight Mechanism Testing.
3. Observe the motion of the InCal Weight when you press Raise or Lower.
If the weight does not move, replace the InCal Motor. (See Section 3.3.21.)
4. If the operation is not smooth, replace the entire InCal Mechanism. (See Section
3.3.22.)
3.3.23 InCal Motor Removal & Replacement
1. Remove the balance's Housing and Load Cell, as described in earlier sections.
Remove the two screws holding the InCal Motor and InCal Motor Shield in place
2.
from the InCal Mechanism. (See Figures 3-99 and 3-100.)
Screws holding
InCal Motor
Figure 3-99. InCal Motor.
With the Incal Weight in upper-most
3.
position, the Motor Coupler should
be in the position shown in
Figure 3-101.
Ohaus Corporation www.ohaus.com
InCal
Mechanism
Art
Figure 3-100. InCal Motor Removal.
InCal Weight
Figure 3-101. Motor Coupler.
3-36 Pioneer™ Balances Service Manual
InCal Motor
InCal Motor
Art
Shield
Mounting
Art
Screws
Art
Motor
Coupler