Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 245)

Troubleshooting Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 227
Table 10-5: Relay Board Status LED Failure Indications
LED FUNCTION
SIGNAL I/O PARAMETER
DIAGNOSTIC TECHNIQUE
ACTIVATED BY VIEW RESULT
D2
Yellow
WHEEL
HEATER
WHEEL_HEATER WHEEL_TEMP
Voltage displayed should change. If not:
Failed Heater
Faulty Temperature Sensor
Failed AC Relay
Faulty Connectors/Wiring
D3
Yellow
BENCH
HEATER
BENCH_HEATER BENCH_TEMP
Voltage displayed should change. If not:
Failed Heater
Faulty Temperature Sensor
Failed AC Relay
Faulty Connectors/Wiring
D4
Yellow
SPARE N/A N/A N/A
D5
Green
SAMPLE/CAL
GAS VALVE
OPTION
CAL_VALVE N/A
Sample/Cal Valve should audibly change states. If
not:
Failed Valve
Failed Relay Drive IC on Relay Board
Failed Relay Board
Faulty +12 VDC Supply (PS2)
Faulty Connectors/Wiring
D6
Green
ZERO/SPAN
GAS VALVE
OPTION
SPAN_VALVE N/A
Zero/Span Valve should audibly change states. If
not:
Failed Valve
Failed Relay Drive IC on Relay Board
Failed Relay Board
Faulty +12 VDC Supply (PS2)
Faulty Connectors/Wiring
D7
Green
SHUTOFF
VALVE OPTION
SHUTOFF_VALVE N/A
Shutoff Valve should audibly change states. If not:
Failed Valve
Failed Relay Drive IC on Relay Board
Failed Relay Board
Faulty +12 VDC Supply (PS2)
Faulty Connectors/Wiring
D8
Green
IR SOURCE IR_SOURCE CO
2
_MEASURE
Voltage displayed should change. If not:
Failed IR Source
Faulty +12 VDC Supply (PS2)
Failed Relay Board
Failed IR Photo-Detector
Failed Sync/Demod Board
Faulty Connectors/Wiring