CHAPTER 3 MAINTENANCE PROCEDURES
Ranger
™
(Count) 3000 Series Service Manual
3-3
Ohaus Corporation www.ohaus.com
3.4 Removing/Replacing the Main PCB and Display PCB
If the PCBs are suspected of being faulty, they should be replaced, as follows:
1. Disconnect the C
able connecting the Main PCB to the scale’s power system.
(See Figure 3-2.)
2. Remove the four screws that secure the PCB to the bottom housing.
3. If either the Main PCB or the Load Cell is to be replaced, note the order of the wire
colors and then disconnect the Load Cell Cable from the Main PCB. (See Figure 3-
2.)
4. Position the replacement PCB as in Figure 3-2, insert and tighten the screws.
5. Re-connect the Load Cell Cables to the PCB, in the same position as originally
installed.
6. Re-connect the
Cable connecting the Main PCB to the scale’s power system.
(See Figure 3-2.)
7. Insert and tighten the screws that secure the PCB to the bottom housing.
Figure 3-3. Main Printed Circuit Board.
