IB-106-340
5-5
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATER T/C +
HEATER T/C -
INC
INC
DEC
DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% O2
SW2
TP1
J1
TP2
TP3
RED
YEL
GRN
ORG
TP4
TP5
TP6
ON
22220035
Figure 5-3. Fault 3, Reversed Thermocouple
c.
Fault 3, Reversed Thermocouple. The
HEATER T/C LED flashes three times, pauses
for three seconds, and repeats (Figure 5-3).
1. Using a multimeter, measure TP3+ to TP4-.
2. If the reading is negative, the thermocouple
wiring is reversed.
3. Check red and yellow wires in the J1
connector for the proper placement.
4. If the wiring is correct, the fault is in the PC
board. See paragraph 6-5b, Electronic As-
sembly Replacement.
Summary of Contents for Oxymitter 4000
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