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Troubleshooting Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 226
D1 – M/R Sensor Status
D2 – Segment Sensor Status
JP4 Connector to Opto-Pickup
Board
Figure 10-4: Sync/Demod Board Status LED Locations
10.1.4.3. Relay Board Status LEDs
There are eight LEDs located on the Relay Board. The most important of which is D1 is the most
important LED, which indicates the health of the I
2
C bus. If D1 is blinking the other faults following LEDs
can be used in conjunction with DIAG menu signal I/O to identify hardware failures of the relays and
switches on the relay (See Section 6.9.2 and Appendix D).
Table 10-4: I2C Status LED Failure Indications
LED FUNCTION FAULT STATUS INDICATED FAILURE(S)
D1
(Red)
I
2
C bus Health
(Watchdog
Circuit)
Continuously ON
or
Continuously OFF
Failed/Halted CPU
Faulty Motherboard, or Relay Board
Faulty Connectors/Wiring to/from Relay Board
Failed/Faulty +5 VDC Power Supply (PS1)
STATUS LED’s
DC VOLTAGE TEST
POINTS
RELAY PCA
Figure 10-5: Relay Board Status LEDs