Troubleshooting & Repair

Model GFC7001E Carbon Dioxide Analyzer

See Appendix A-4 for a complete list of the parameters available for review under this menu

13.1.4.INTERNAL ELECTRONIC STATUS LED’S

Several LED’s are located inside the instrument to assist in determining if the analyzer’s CPU, I2C bus and relay board, GFC Wheel and the sync/demodulator board are functioning properly.

13.1.4.1.CPU Status Indicator

DS5, a red LED, that is located on upper portion of the motherboard, just to the right of the CPU board, flashes when the CPU is running the main program loop. After power-up, approximately 30 to 60 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

P/N 04069

CPU Status LED

Figure 13-3: CPU Status Indicator

Teledyne Analytical Instruments

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Teledyne GFC 7001EM operation manual Internal Electronic Status LED’S, CPU Status Indicator, CPU Status LED