IB-106-340
5-4
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
22220034
Figure 5-2. Fault 2, Shorted Thermocouple
b.
Fault 2, Shorted Thermocouple. The HEATER
T/C LED flashes twice, pauses for three seconds,
and repeats (Figure 5-2).
1. Using a multimeter, measure across TP3+
and TP4-.
2. If the reading is 0 ±0.5 mV, then a shorted
thermocouple is likely.
3. Remove power and disconnect J1.
4. Measure from TP3+ to TP4-. The reading
should be approximately 20 Kohms.
5. If so, the short is not on the PC board. See
paragraph 6-7, Heater Strut Replacement.
Содержание Oxymitter 4000
Страница 19: ...IB 106 340 xv ...