DSGH Installation and Operation Guide 89
Diagnostics and repair
Procedure 5.3: To replace the CPU or power supply board
1. Shut off the power to the gauge.
2. Remove the housing cover.
3. Remove the plastic electronics cover.
4. Remove the terminal wiring connector.
5. Remove the three (3) screws holding the electronics package in place.
6. Carefully pull the electronics package out of the housing.
7. Remove the appropriate board from the clamshell assembly by
removing the three (3) mounting nuts.
8. Carefully reconnect any ribbon cables.
9. Install the electronics package in the housing.
10. Replace the three (3) mounting nuts.
11. Reconnect the terminal wiring connector.
12. Install the plastic electronics cover.
13. Install the housing cover.
14. Turn on the power to the unit.
15. Connect a HART communicator to the unit and verify that the unit
is operational.
Note: If you change the CPU board, a New Hardware Found error
message appears when you connect with the HART
communicator. This is normal. Follow the procedure on
page 4-62 for installing new hardware so the non-volatile
memory on the CPU configures properly.
Note: If you are changing the CPU board, you must
move the old firmware chip to the new board if
the new board firmware is different.
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