Teledyne API T803 CO2/O2 Analyzer Operation Manual Troubleshooting and Service
189

11.2.2.2. RELAY PCA STATUS LED S

D6
(
Yellow
)
O
2
Senso
r
Heater
D5 (Yellow) – CO
2
Sensor Heater
(only with CO
2
option)
D1 (RED)
Watchdog Indicator
Figure 11-4: Relay PCA Status LEDs Used for Troubleshooting
Table 11-4: Relay PCA Status LED Failure Indications
LED Color Function Status When LED Lit
(Energized State)
Status When LED Unlit
(Default State)
D1 Red Watchdog Circuit Cycles ON/OFF every 3 Seconds
under direct control of the analyzer’s CPU.
D2-D4 SPARE
D5 Yellow CO2 Sensor Cell heater Heating Not Heating
D6 Yellow O2 Sensor heater Heating Not Heating
D72 Green
D82 Green
D92 Green
D102 Green
D11 - 16 SPARE
2 Not Used
07276B DCN6418