TELEDYNE API T300M - Relay Board Status Leds; Table 5-7. I 2 C Status LED Failure Indications

083730300A DCN8101 Maintenance and Service 119
Figure 5-8. Sync/Demod Board Status LED Locations
5.7.8 RELAY BOARD STATUS LEDS
There are eight LEDs located on the Relay Board. The most important of which is D1,
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 5.7.4 and Appendix D).
Table 5-7. I
2
C Status LED Failure Indications
LED
FUNCTION
FAULT STATUS
INDICATED FAILURE(S)
D1
(Red)
I
2
C bus Health
(Watch Dog
Circuit)
Continuously ON
or
Continuously OFF
Failed/Halted CPU
Faulty Motherboard, Touchscreen or Relay Board
Faulty Connectors/Wiring between Motherboard,
Touchscreen or Relay Board
Failed/Faulty +5 VDC Power Supply (PS1)