I 2 C Bus Watchdog Status Led; O 3 Option Status Led; Figure 5-12. Relay Pca Status Leds Used For Troubleshooting; Table 5-5. Relay Pca Watchdog Led Failure Indication - Teledyne T400 User Manual

5.7.4.2 I C BUS WATCHDOG STATUS LED
2
The most important of the Relay Board Status LEDs is D1, which indicates the health of
the I 2 C bus. LEDs that remain continuously off or on (not blinking) indicate a fault state
for their respective components.

Table 5-5. Relay PCA Watchdog LED Failure Indication

LED FUNCTION
I 2 C bus Health
D1
(Watchdog
(Red)
Circuit)
5.7.4.3 O OPTION STATUS LED
3

Figure 5-12. Relay PCA Status LEDs Used for Troubleshooting

083730400A DCN8130
FAULT STATUS
Continuously ON or
Continuously OFF
Teledyne API – Model T400 O
INDICATED FAILURE(S)
Failed/Halted CPU
Faulty Motherboard, Valve Driver board or Relay PCA
Faulty connectors/wiring between Motherboard, Valve Driver board
or Relay PCA
Failed/Faulty +5 VDC Power Supply (PS1)
Analyzer
3
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