Troubleshooting Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 225
seconds, DS5 should flash on and off. If characters are written to the front panel display but DS5 does
not flash then the program files have become corrupted. If after 30 – 60 seconds neither the DS5 is
flashing or no characters have been written to the front panel display then the CPU is bad and must be
replaced.
Motherboard
CPU Status LED
Figure 10-3: CPU Status Indicator
10.1.4.2. Sync Demodulator Status LED’s
Two LEDs located on the Sync/Demod Board and are there to make it obvious that the GFC Wheel is
spinning and the synchronization signals are present:
Table 10-3: Sync/Demod Board Status Failure Indications
LED FUNCTION FAULT STATUS INDICATED FAILURE(S)
D1
M/R Sensor Status
(Flashes slowly)
LED is stuck
ON or OFF
GFC Wheel is not turning
M/R Sensor on Opto-Pickup Board failed
Sync/Demod Board failed
JP 4 Connector/Wiring faulty
Failed/Faulty +5 VDC Power Supply (PS1)
D2
Segment Sensor
Status
(Flashes quickly)
LED is stuck
ON or OFF
GFC Wheel is not turning
Segment Sensor on Opto-Pickup Board failed
Sync/Demod Board failed
JP 4 Connector/Wiring faulty
Failed/Faulty +5 VDC Power Supply (PS1)
