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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 CO
2
Sensor Cell heater Heating Not Heating
D6
Yellow O
2
Sensor heater Heating Not Heating
D7
2
Green
D8
2
Green
D9
2
Green
D10
2
Green
D11 - 16 SPARE
2
Not Used
07276B DCN6418