Rice Lake 880 Performance Series Indicator/Controller Technical/Service Manual - Manual (Page 26)

20 880 Technical/Service Manual
2.9 Audit Trail and the Audit Jumper
The 880 includes an audit trail feature that keeps track of the number and the last date of calibrations and Legal for
Trade configuration changes. It is possible to setup the 880 to allow entry to the configuration and calibration
menus using only the front panel MENU key.
On the top of the CPU board is a 3-pin Jumper (JP4 - see Figure 2-12) that enables or disables this feature.
• To use the audit trail and allow the use of the MENU key to enter the configuration and calibration mode,
place the jumper in the ON position.
• To prevent the use of the MENU key to enter the configuration and calibration mode, instead requiring use of
the externally seal-able configuration switch located inside the enclosure (see Figure 3-1), place the jumper
in the OFF position.
The audit trail counters will operate in either position of the audit jumper.
2.10 Board Replacement
If the 880 CPU board must be removed, use the following procedure:
1. Disconnect power to the indicator.
2. Unplug all connectors from the backplate. See Figure 2-12 for connector locations.
3. Remove the controller assembly from the DIN rail (see Section 2.3).
4. Loosen the four corner screws and carefully pull the backplate straight out from the enclosure. The boards
are still connected to the backplate and will slide out of the enclosure.
Corner Screws
Note
All boards will slide out together, the power supply board and the CPU board are connected by a cable.
Figure 2-13. Remove Backplate With Boards
5. Remove the cable connecting the boards.
6. Remove the board to be replaced by loosening the screws holding it to the back plate.