
CALIBRATION AND MAINTENANCE UM344-2
September 1995
Transmitter LCD MXC
1. If not already in communication with the suspect transmitter,
establish communications by executing the "FIND XMTR" routine on the MXC as described in
Section 3.2.
2. Press the MXC's STATUS key. If the message "FAILSAFE" appears in the display, the
transmitter has failed a self-diagnostic test.
3. Press ERRORS (F2) to display all active transmitter errors. Note which of the error messages
in Table 6.1 is displayed (multiple errors can be displayed).
TABLE 6.1 Self-Diagnostics Troubleshooting
MXC
MESSAGE
PROBABLE CAUSE CORRECTIVE ACTION
E2 ROM ROM CHECKSUM match failed. Replace Electronics Module
E3 RAM Microprocessor failed, RAM inoperative. Replace Electronics Module
E4 EPROM Microprocessor cannot retain
configuration or calibration data.
Reconfigure/recalibrate transmitter. Perform
transmitter TEST (step 4). If TEST fails, replace
Electronics Module.
E5 TIMER A major cycle interrupted itself. Replace Electronics Module
E6 SENSOR
Three successive A/D sensor
conversions were bad
Replace Electronics Module
4. Confirm that the fault still exists by selecting the CALIBRATE/TEST screen from the On-Line
Menu of the MXC and press TEST (F3). This instructs the transmitter to perform a self-
diagnostic test.
Fault Remains:
If the fault remains, the adjacent message will be displayed:
FAIL
TRANSMITTER FAILED
TRANSMITTER SELFTEST
CONT
PT101 FAILSAFE
ER-
RORS EXIT
TRANSMITTER FAILED
TRANSMITTER SELFTEST
CONT
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