Troubleshooting & Repair

Model GFC7001E Carbon Dioxide Analyzer

13.1.4.3.Relay Board Status LED’s

There are eight LED’s located on the Relay Board. The most important of which is D1, which indicates the health of the I2C bus. If D1 is blinking the other faults following LED’s 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 13.1.3 and Appendix D).

Table 13-4: I2C Status LED Failure Indications

LED

FUNCTION

FAULT STATUS

INDICATED FAILURE(S)

 

I2C bus Health

 

Failed/Halted CPU

D1

Continuously ON

Faulty Motherboard, Keyboard or Relay Board

(Watch Dog

or

Faulty Connectors/Wiring between Motherboard,

(Red)

Circuit)

Continuously OFF

Keyboard or Relay Board

 

 

 

 

Failed/Faulty +5 VDC Power Supply (PS1)

STATUS LED’s

DC VOLTAGE TEST

POINTS

 

RELAY PCA

PN 04135

Figure 13-5: Relay Board Status LEDs

Teledyne Analytical Instruments

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Teledyne GFC 7001EM operation manual Relay PCA, Relay Board Status LED’s, I2C Status LED Failure Indications