
2. Reconnect power to the transmitter.
3. Perform the recommended actions in
8.5.3
Fault 3, Reversed Thermocouple Wiring or Faulty PC
Board
The figures below show the electronic assembly for a transmitter with a membrane
keypad and a transmitter with an LOI.
The membrane keypad also shows J1 and test points TP1 through TP6 located on the
microprocessor board, below the membrane keypad or the LOI module.
Fault 3, membrane keypad
When Fault 3 is detected, the
HEATER T/C
LED flashes three times, pauses for three
seconds, and repeats.
Figure 8-6: HEATER T/C LED Alarm on Membrane Keypad
Recommended actions
1. Using a multimeter, measure the voltage from TP3+ to TP4-.
If the reading is negative, the thermocouple wiring is reversed.
2. Check red and yellow wires in the J1 connector for the proper placement.
If the wiring is correct, the fault is in the PC board. See
.
Reference Manual
Troubleshoot
00809-0100-4340
October 2019
Rosemount Oxymitter 4000
123
Summary of Contents for Rosemount Oxymitter 4000
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